微信小程序生成朋友圈分享图/海报

效果图

源码用demo下载，海报内容根据实际调整，
海报生成原文链接：https://developers.weixin.qq.com/community/develop/article/doc/000ac686c5c5506f18b87ee825b013
demo 代码片段：https://developers.weixin.qq.com/s/J38pKsmK7Qw5
小程序海报生成工具链接：https://developers.weixin.qq.com/community/develop/article/doc/000e222d9bcc305c5739c718d56813
npm 链接： https://www.npmjs.com/package/mina-painter
使用组件：Painter
Painter 一款轻量级的小程序海报生成组件
pages 文件夹
pages/index/index.wxml
pages/index/index.json

{
"navigationBarTitleText":"生成朋友圈分享图",
"usingComponents": {
"share-box": "/components/shareBox/index"
}
}
pages/index/index.js

const app = getApp()

Page({
data: {
isCanDraw: false,
detailObj: {}
},
onLoad() {
const res = {"errCode":0,"status":200,"data":{"broker":{"name":"经纪人","brokerid":"19","storename":"余杭店","headurl":"https://broker.dissai.com.cn/webapiformal//UploadFilesformal/2023-09-28/8646b899-71b8-44ca-8ec0-1e5cc6edb482.jpg","phone":"188xxxx0000"},"result":[{"id":199.0,"type":"新房","propertyIntro":"绿创·溪山赋呼应时代所想，以“山水、低密、城心、别墅”为元素，以0.59容积率为底气，构建“山水别墅+城市别墅=半山墅院”的全新生活，为嵊州居者提供“城心桃花源”的非凡体验。","imgpath":"https://broker.dissai.com.cn/webapiformal//UploadFilesformal/Broker/2023-09-24/c4837043-b5fd-4af2-9216-499e85ac1d041.jpg","chamber":0,"office":0,"defend":0,"area":295.00,"price":737.00,"averagePrice":25000.00,"facilitesList":["别墅"],"labelList":["人车分流","低密居所","绿化率高"],"rentalMethod":"","city":"嵊州市","propertyName":"溪山赋","state":"在售","bShouCang":false,"propertyType":"住宅","mianJiMax":295.00,"mianJiMin":216.00,"juShiMax":6.0,"juShiMin":5.0,"priceMax":25000.0,"priceMin":24983.0,"allPriceMax":737.0,"allPriceMin":540.0,"mobileShowType":2,"houseid":"199","iscollect":false,"brokerid":"25"}]}}
this.setData({
detailObj: res.data
})
console.log(res.data.result[0])
},

createShareImage() {
this.setData({
isCanDraw: !this.data.isCanDraw
})
}
})
pages/index/index.wxss

.intro {
width: 686rpx;
height: 88rpx;
background: #00cc88;
color: #FFF;
border-radius: 16rpx;
font-size: 32rpx;
text-align: center;
margin: 200rpx auto;
}
components 文件夹
components/shareBox/index.wxml
components/shareBox/index.json

{
"component": true,
"usingComponents": {
"painter": "../painter/painter",
"dialog-modal": "../dialogModal/index"
}
}
components/shareBox/index.js

Component({
properties: {
//属性值可以在组件使用时指定
isCanDraw: {
type: Boolean,
value: false,
observer(newVal, oldVal) {
newVal && this.drawPic()
}
},
detailObj: {
type: Object,
value: {},
}
},
data: {
isModal: false, //是否显示拒绝保存图片后的弹窗
imgDraw: {}, //绘制图片的大对象
sharePath: '', //生成的分享图
visible: false
},
lifetimes: {
attached() {
}
},
methods: {
handlePhotoSaved() {
this.savePhoto(this.data.sharePath)
},
handleClose() {
this.setData({
visible: false
})
},
drawPic() {
const detailObj= this.properties.detailObj
if (this.data.sharePath) { //如果已经绘制过了本地保存有图片不需要重新绘制
this.setData({
visible: true
})
this.triggerEvent('initData')
return
}
wx.showLoading({
title: '生成中'
})
const result = detailObj.result[0];
const list = result.labelList;
const newViews = [];
for(let index = 0; index < list.length ; index ++) {
newViews.push({
type: 'text',
text: ${list[index]},
css: [{
color: '#e90820',
top: '1160rpx',
left: ${50 + 120 * index}rpx,
fontSize: '20rpx',
borderRadius: '6rpx',
padding: '4px',
background: '#f3e6e6',
}],
})
}

this.setData({
imgDraw: {
width: '654rpx',
height: '1390rpx',
background: 'https://broker.dissai.com.cn/h5/img/fission-bg.png',
views: [
{
type: 'rect',
css: {
width: '610rpx',
height: '990rpx',
top: '220rpx',
right: '20rpx',
color: '#fff',
borderRadius: '20rpx',
},
},
{
type: 'image',
url: ${result.imgpath},
css: {
width: '610rpx',
height: '750rpx',
top: '220rpx',
right: '20rpx',
scalable: true,
},
},
{
type: 'text',
text: ${result.city} | ${result.propertyName},
css: [{
color: '#fff',
top: '920rpx',
left: '40rpx',
fontSize: '24rpx',
}],
},
{
type: 'text',
text: ${result.type === '新房' ? result.propertyName : result.propertyIntro ? result.propertyIntro : result.propertyName},
css: [{
color: '#000',
top: '990rpx',
left: '40rpx',
fontSize: '26rpx',
width: '500rpx',
maxLines: 1,
}],
},
{
type: 'text',
text: ${result.type === '新房' ? result.state : ''},
css: [{
color: '#e90820',
top: '990rpx',
right: '40rpx',
fontSize: '24rpx',
}],
},
{
type: 'text',
text: ${result.type === '新房' ? result.propertyType +' | '+result.mianJiMin +' - '+ result.mianJiMax +'㎡ | '+ result.juShiMin+ ' / '+result.juShiMax+ '居' : result.chamber + 室 + result.office || 0 + 厅 + result.defend || 0 + 卫 },
css: [{
color: '#333',
top: '1050rpx',
left: '40rpx',
fontSize: '24rpx',
}],
},
{
type: 'text',
text:${(result.averagePrice == 0 || result.allPriceMin == 0) ? '待定' : result.mobileShowType === 1 ? result.averagePrice : result.allPriceMin },
css: [{
color: '#e90820',
top: '1100rpx',
left: '40rpx',
fontSize: '26rpx',
}],
},
{
type: 'text',
text: ${result.mobileShowType === 1 ? ' 元/㎡均价' : ' 万元起'},
css: [{
color: '#e90820',
top: '1100rpx',
left: '90rpx',
fontSize: '22rpx',
}],
},
...newViews,
{
type: 'image',
url: ${detailObj.broker.headurl},
css: {
bottom: '40rpx',
left: '40rpx',
borderRadius: '100rpx',
borderWidth: '4rpx',
borderColor: '#fff',
width: '96rpx',
height: '96rpx',
},
},
{
type: 'text',
text: ${detailObj.broker.name}为您推荐,
css: [{
color: '#fff',
bottom: '100rpx',
left: '160rpx',
fontSize: '32rpx',
}],
},
{
type: 'image',
url: 'https://broker.dissai.com.cn/h5/img/phone.png',
css: {
bottom: '50rpx',
left: '160rpx',
width: '28rpx',
height: '28rpx',
},
},
{
type: 'text',
text: 点击拨打 ${detailObj.broker.phone},
css: [{
color: '#fff',
bottom: '50rpx',
left: '200rpx',
fontSize: '26rpx',
fontWight: 'bold'
}],
},
{
type: 'image',
url: 'https://broker.dissai.com.cn/h5/img/code.jpg',
css: {
bottom: '40rpx',
right: '40rpx',
width: '100rpx',
height: '100rpx',
},
},
],
}
})
},
onImgErr(e) {
wx.hideLoading()
wx.showToast({
title: '生成分享图失败，请刷新页面重试'
})
},
onImgOK(e) {
wx.hideLoading()
this.setData({
sharePath: e.detail.path,
visible: true,
})
//通知外部绘制完成，重置isCanDraw为false
this.triggerEvent('initData')
},
preventDefault() { },
// 保存图片
savePhoto(path) {
wx.showLoading({
title: '正在保存...',
mask: true
})
this.setData({
isDrawImage: false
})
wx.saveImageToPhotosAlbum({
filePath: path,
success: (res) => {
wx.showToast({
title: '保存成功',
icon: 'none'
})
setTimeout(() => {
this.setData({
visible: false
})
}, 300)
},
fail: (res) => {
wx.getSetting({
success: res => {
let authSetting = res.authSetting
if (!authSetting['scope.writePhotosAlbum']) {
this.setData({
isModal: true
})
}
}
})
setTimeout(() => {
wx.hideLoading()
this.setData({
visible: false
})
}, 300)
}
})
}
}
})
components/shareBox/index.wxss

.share-wrap {
width: 100%;
}

.share-back {
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.6);
position: fixed;
top: 0;
left: 0;
right: 0;
bottom: 0;
z-index: 888;
}

.share-container {
width: 100%;
background: #FFF;
position: fixed;
bottom: 0;
left: 0;
right: 0;
z-index: 999;
}

.close {
width: 30rpx;
height: 30rpx;
overflow: hidden;
position: absolute;
right: 64rpx;
top: 64rpx;
}

.close::after {
transform: rotate(-45deg);
}

.close::before {
transform: rotate(45deg);
}

.close::before,
.close::after {
content: '';
position: absolute;
height: 3rpx;
width: 100%;
top: 50%;
left: 0;
margin-top: -2rpx;
background: #9C9C9C;
}

.share-image {
width: 420rpx;
margin: 66rpx auto 0;
display: block;
border-radius: 16rpx;
box-shadow: 0px 4rpx 8px 0px rgba(0, 0, 0, 0.1);
}

.share-tips {
width: 100%;
text-align: center;
color: #3C3C3C;
font-size: 28rpx;
margin: 32rpx 0;
height: 40rpx;
}

.save-btn {
width: 336rpx;
height: 96rpx;
margin: 0 auto 94rpx;
background: url('https://qiniu-image.qtshe.com/20190506save-btn.png') center center;
background-size: 100% 100%;
}
components/dialogModal/index.wxml

{{title}}
{{content}}
components/dialogModal/index.json

{
"component": true,
"usingComponents": {}
}
components/dialogModal/index.js

var app = getApp()
Component({
data: {

},
properties: {
isShow: {
type: Boolean,
value: false
},
title: {
type: String,
value: '提示'
},
content: {
type: String,
value: ''
},
cancelText: {
type: String,
value: '取消'
},
confirmText: {
type: String,
value: '确定'
},
isNeedAuth: {
type: Boolean,
value: false
},
cancelType: {
type: String,
value: ''
},
confirmType: {
type: String,
value: ''
}
},
methods: {
preventTouchMove() { },
cancel() {
this.setData({
isShow: false
})
this.triggerEvent('cancel')
},
confirm() {
this.setData({
isShow: false
})
this.triggerEvent('confirm')
}
}
})
components/dialogModal/index.wxss

.container {
width: 100%;
height: 100%;
}

.back-model {
width: 100%;
height: 100%;
position: fixed;
z-index: 999;
background-color: rgba(0, 0, 0, 0.6);
top: 0;
}

.conent-model {
position: fixed;
left: 50%;
top: 50%;
width: 622rpx;
margin-left: -311rpx;
margin-top: -200rpx;
z-index: 999;
background: #fff;
border-radius: 8rpx;
padding-top: 32rpx;
}

.title {
display: block;
text-align: center;
font-size: 36rpx;
color: #3c3c3c;
}

.content {
display: block;
text-align: center;
font-size: 30rpx;
padding: 32rpx;
color: #999;
}

.quickBtn {
width: 100%;
height: 96rpx;
border-top: 2rpx solid #EEE;
line-height: 96rpx;
}

.cancel-btn {
width: 50%;
display: inline-block;
color: #3c3c3c;
font-size: 32rpx;
text-align: center;
height: 96rpx;
line-height: 96rpx;
border-right: 1rpx solid #EEE;
}

.confirm-btn {
width: 50%;
display: inline-block;
color: #00cc88;
font-size: 32rpx;
height: 96rpx;
line-height: 96rpx;
text-align: center;
border-left: 1rpx solid #EEE;
}
components/painter/painter.wxml
components/painter/painter.json

{
"component": true,
"usingComponents": {}
}
components/painter/painter.js

import Pen, { penCache, clearPenCache } from './lib/pen';
import Downloader from './lib/downloader';
import WxCanvas from './lib/wx-canvas';

const util = require('./lib/util');
const calc = require('./lib/calc');

const downloader = new Downloader();

// 最大尝试的绘制次数
const MAX_PAINT_COUNT = 5;
const ACTION_DEFAULT_SIZE = 24;
const ACTION_OFFSET = '2rpx';
Component({
canvasWidthInPx: 0,
canvasHeightInPx: 0,
canvasNode: null,
paintCount: 0,
currentPalette: {},
outterDisabled: false,
isDisabled: false,
needClear: false,
/**
* 组件的属性列表
*/
properties: {
use2D: {
type: Boolean,
},
customStyle: {
type: String,
},
// 运行自定义选择框和删除缩放按钮
customActionStyle: {
type: Object,
},
palette: {
type: Object,
observer: function (newVal, oldVal) {
if (this.isNeedRefresh(newVal, oldVal)) {
this.paintCount = 0;
clearPenCache();
this.startPaint();
}
},
},
dancePalette: {
type: Object,
observer: function (newVal, oldVal) {
if (!this.isEmpty(newVal) && !this.properties.use2D) {
clearPenCache();
this.initDancePalette(newVal);
}
},
},
// 缩放比，会在传入的 palette 中统一乘以该缩放比
scaleRatio: {
type: Number,
value: 1,
},
widthPixels: {
type: Number,
value: 0,
},
// 启用脏检查，默认 false
dirty: {
type: Boolean,
value: false,
},
LRU: {
type: Boolean,
value: false,
},
action: {
type: Object,
observer: function (newVal, oldVal) {
if (newVal && !this.isEmpty(newVal) && !this.properties.use2D) {
this.doAction(newVal, null, false, true);
}
},
},
disableAction: {
type: Boolean,
observer: function (isDisabled) {
this.outterDisabled = isDisabled;
this.isDisabled = isDisabled;
},
},
clearActionBox: {
type: Boolean,
observer: function (needClear) {
if (needClear && !this.needClear) {
if (this.frontContext) {
setTimeout(() => {
this.frontContext.draw();
}, 100);
this.touchedView = {};
this.prevFindedIndex = this.findedIndex;
this.findedIndex = -1;
}
}
this.needClear = needClear;
},
},
},

data: {
picURL: '',
showCanvas: true,
painterStyle: '',
},

methods: {
/**
* 判断一个 object 是否为空
* @param {object} object
*/
isEmpty(object) {
for (const i in object) {
return false;
}
return true;
},

isNeedRefresh(newVal, oldVal) {
if (!newVal || this.isEmpty(newVal) || (this.data.dirty && util.equal(newVal, oldVal))) {
return false;
}
return true;
},

getBox(rect, type) {
const boxArea = {
type: 'rect',
css: {
height: ${rect.bottom - rect.top}px,
width: ${rect.right - rect.left}px,
left: ${rect.left}px,
top: ${rect.top}px,
borderWidth: '4rpx',
borderColor: '#1A7AF8',
color: 'transparent',
},
};
if (type === 'text') {
boxArea.css = Object.assign({}, boxArea.css, {
borderStyle: 'dashed',
});
}
if (this.properties.customActionStyle && this.properties.customActionStyle.border) {
boxArea.css = Object.assign({}, boxArea.css, this.properties.customActionStyle.border);
}
Object.assign(boxArea, {
id: 'box',
});
return boxArea;
},

getScaleIcon(rect, type) {
let scaleArea = {};
const { customActionStyle } = this.properties;
if (customActionStyle && customActionStyle.scale) {
scaleArea = {
type: 'image',
url: type === 'text' ? customActionStyle.scale.textIcon : customActionStyle.scale.imageIcon,
css: {
height: ${2 * ACTION_DEFAULT_SIZE}rpx,
width: ${2 * ACTION_DEFAULT_SIZE}rpx,
borderRadius: ${ACTION_DEFAULT_SIZE}rpx,
},
};
} else {
scaleArea = {
type: 'rect',
css: {
height: ${2 * ACTION_DEFAULT_SIZE}rpx,
width: ${2 * ACTION_DEFAULT_SIZE}rpx,
borderRadius: ${ACTION_DEFAULT_SIZE}rpx,
color: '#0000ff',
},
};
}
scaleArea.css = Object.assign({}, scaleArea.css, {
align: 'center',
left: ${rect.right + ACTION_OFFSET.toPx()}px,
top:
type === 'text'
? ${rect.top - ACTION_OFFSET.toPx() - scaleArea.css.height.toPx() / 2}px
: ${rect.bottom - ACTION_OFFSET.toPx() - scaleArea.css.height.toPx() / 2}px,
});
Object.assign(scaleArea, {
id: 'scale',
});
return scaleArea;
},

getDeleteIcon(rect) {
let deleteArea = {};
const { customActionStyle } = this.properties;
if (customActionStyle && customActionStyle.scale) {
deleteArea = {
type: 'image',
url: customActionStyle.delete.icon,
css: {
height: ${2 * ACTION_DEFAULT_SIZE}rpx,
width: ${2 * ACTION_DEFAULT_SIZE}rpx,
borderRadius: ${ACTION_DEFAULT_SIZE}rpx,
},
};
} else {
deleteArea = {
type: 'rect',
css: {
height: ${2 * ACTION_DEFAULT_SIZE}rpx,
width: ${2 * ACTION_DEFAULT_SIZE}rpx,
borderRadius: ${ACTION_DEFAULT_SIZE}rpx,
color: '#0000ff',
},
};
}
deleteArea.css = Object.assign({}, deleteArea.css, {
align: 'center',
left: ${rect.left - ACTION_OFFSET.toPx()}px,
top: ${rect.top - ACTION_OFFSET.toPx() - deleteArea.css.height.toPx() / 2}px,
});
Object.assign(deleteArea, {
id: 'delete',
});
return deleteArea;
},

doAction(action, callback, isMoving, overwrite) {
if (this.properties.use2D) {
return;
}
let newVal = null;
if (action) {
newVal = action.view;
}
if (newVal && newVal.id && this.touchedView.id !== newVal.id) {
// 带 id 的动作给撤回时使用，不带 id，表示对当前选中对象进行操作
const { views } = this.currentPalette;
for (let i = 0; i < views.length; i++) {
if (views[i].id === newVal.id) {
// 跨层回撤，需要重新构建三层关系
this.touchedView = views[i];
this.findedIndex = i;
this.sliceLayers();
break;
}
}
}

const doView = this.touchedView;

if (!doView || this.isEmpty(doView)) {
return;
}
if (newVal && newVal.css) {
if (overwrite) {
doView.css = newVal.css;
} else if (Array.isArray(doView.css) && Array.isArray(newVal.css)) {
doView.css = Object.assign({}, ...doView.css, ...newVal.css);
} else if (Array.isArray(doView.css)) {
doView.css = Object.assign({}, ...doView.css, newVal.css);
} else if (Array.isArray(newVal.css)) {
doView.css = Object.assign({}, doView.css, ...newVal.css);
} else {
doView.css = Object.assign({}, doView.css, newVal.css);
}
}
if (newVal && newVal.rect) {
doView.rect = newVal.rect;
}
if (newVal && newVal.url && doView.url && newVal.url !== doView.url) {
downloader
.download(newVal.url, this.properties.LRU)
.then(path => {
if (newVal.url.startsWith('https')) {
doView.originUrl = newVal.url;
}
doView.url = path;
wx.getImageInfo({
src: path,
success: res => {
doView.sHeight = res.height;
doView.sWidth = res.width;
this.reDraw(doView, callback, isMoving);
},
fail: () => {
this.reDraw(doView, callback, isMoving);
},
});
})
.catch(error => {
// 未下载成功，直接绘制
console.error(error);
this.reDraw(doView, callback, isMoving);
});
} else {
newVal && newVal.text && doView.text && newVal.text !== doView.text && (doView.text = newVal.text);
newVal &&
newVal.content &&
doView.content &&
newVal.content !== doView.content &&
(doView.content = newVal.content);
this.reDraw(doView, callback, isMoving);
}
},

reDraw(doView, callback, isMoving) {
const draw = {
width: this.currentPalette.width,
height: this.currentPalette.height,
views: this.isEmpty(doView) ? [] : [doView],
};
const pen = new Pen(this.globalContext, draw);

pen.paint(callbackInfo => {
callback && callback(callbackInfo);
this.triggerEvent('viewUpdate', {
view: this.touchedView,
});
});

const { rect, css, type } = doView;

this.block = {
width: this.currentPalette.width,
height: this.currentPalette.height,
views: this.isEmpty(doView) ? [] : [this.getBox(rect, doView.type)],
};
if (css && css.scalable) {
this.block.views.push(this.getScaleIcon(rect, type));
}
if (css && css.deletable) {
this.block.views.push(this.getDeleteIcon(rect));
}
const topBlock = new Pen(this.frontContext, this.block);
topBlock.paint();
},

isInView(x, y, rect) {
return x > rect.left && y > rect.top && x < rect.right && y < rect.bottom;
},

isInDelete(x, y) {
for (const view of this.block.views) {
if (view.id === 'delete') {
return x > view.rect.left && y > view.rect.top && x < view.rect.right && y < view.rect.bottom;
}
}
return false;
},

isInScale(x, y) {
for (const view of this.block.views) {
if (view.id === 'scale') {
return x > view.rect.left && y > view.rect.top && x < view.rect.right && y < view.rect.bottom;
}
}
return false;
},

touchedView: {},
findedIndex: -1,
onClick() {
const x = this.startX;
const y = this.startY;
const totalLayerCount = this.currentPalette.views.length;
let canBeTouched = [];
let isDelete = false;
let deleteIndex = -1;
for (let i = totalLayerCount - 1; i >= 0; i--) {
const view = this.currentPalette.views[i];
const { rect } = view;
if (this.touchedView && this.touchedView.id && this.touchedView.id === view.id && this.isInDelete(x, y, rect)) {
canBeTouched.length = 0;
deleteIndex = i;
isDelete = true;
break;
}
if (this.isInView(x, y, rect)) {
canBeTouched.push({
view,
index: i,
});
}
}
this.touchedView = {};
if (canBeTouched.length === 0) {
this.findedIndex = -1;
} else {
let i = 0;
const touchAble = canBeTouched.filter(item => Boolean(item.view.id));
if (touchAble.length === 0) {
this.findedIndex = canBeTouched[0].index;
} else {
for (i = 0; i < touchAble.length; i++) {
if (this.findedIndex === touchAble[i].index) {
i++;
break;
}
}
if (i === touchAble.length) {
i = 0;
}
this.touchedView = touchAble[i].view;
this.findedIndex = touchAble[i].index;
this.triggerEvent('viewClicked', {
view: this.touchedView,
});
}
}
if (this.findedIndex < 0 || (this.touchedView && !this.touchedView.id)) {
// 证明点击了背景或无法移动的view
this.frontContext.draw();
if (isDelete) {
this.triggerEvent('touchEnd', {
view: this.currentPalette.views[deleteIndex],
index: deleteIndex,
type: 'delete',
});
this.doAction();
} else if (this.findedIndex < 0) {
this.triggerEvent('viewClicked', {});
}
this.findedIndex = -1;
this.prevFindedIndex = -1;
} else if (this.touchedView && this.touchedView.id) {
this.sliceLayers();
}
},

sliceLayers() {
const bottomLayers = this.currentPalette.views.slice(0, this.findedIndex);
const topLayers = this.currentPalette.views.slice(this.findedIndex + 1);
const bottomDraw = {
width: this.currentPalette.width,
height: this.currentPalette.height,
background: this.currentPalette.background,
views: bottomLayers,
};
const topDraw = {
width: this.currentPalette.width,
height: this.currentPalette.height,
views: topLayers,
};
if (this.prevFindedIndex < this.findedIndex) {
new Pen(this.bottomContext, bottomDraw).paint();
this.doAction();
new Pen(this.topContext, topDraw).paint();
} else {
new Pen(this.topContext, topDraw).paint();
this.doAction();
new Pen(this.bottomContext, bottomDraw).paint();
}
this.prevFindedIndex = this.findedIndex;
},

startX: 0,
startY: 0,
startH: 0,
startW: 0,
isScale: false,
startTimeStamp: 0,
onTouchStart(event) {
if (this.isDisabled) {
return;
}
const { x, y } = event.touches[0];
this.startX = x;
this.startY = y;
this.startTimeStamp = new Date().getTime();
if (this.touchedView && !this.isEmpty(this.touchedView)) {
const { rect } = this.touchedView;
if (this.isInScale(x, y, rect)) {
this.isScale = true;
this.startH = rect.bottom - rect.top;
this.startW = rect.right - rect.left;
} else {
this.isScale = false;
}
} else {
this.isScale = false;
}
},

onTouchEnd(e) {
if (this.isDisabled) {
return;
}
const current = new Date().getTime();
if (current - this.startTimeStamp <= 500 && !this.hasMove) {
!this.isScale && this.onClick(e);
} else if (this.touchedView && !this.isEmpty(this.touchedView)) {
this.triggerEvent('touchEnd', {
view: this.touchedView,
});
}
this.hasMove = false;
},

onTouchCancel(e) {
if (this.isDisabled) {
return;
}
this.onTouchEnd(e);
},

hasMove: false,
onTouchMove(event) {
if (this.isDisabled) {
return;
}
this.hasMove = true;
if (!this.touchedView || (this.touchedView && !this.touchedView.id)) {
return;
}
const { x, y } = event.touches[0];
const offsetX = x - this.startX;
const offsetY = y - this.startY;
const { rect, type } = this.touchedView;
let css = {};
if (this.isScale) {
clearPenCache(this.touchedView.id);
const newW = this.startW + offsetX > 1 ? this.startW + offsetX : 1;
if (this.touchedView.css && this.touchedView.css.minWidth) {
if (newW < this.touchedView.css.minWidth.toPx()) {
return;
}
}
if (this.touchedView.rect && this.touchedView.rect.minWidth) {
if (newW < this.touchedView.rect.minWidth) {
return;
}
}
const newH = this.startH + offsetY > 1 ? this.startH + offsetY : 1;
css = {
width: ${newW}px,
};
if (type !== 'text') {
if (type === 'image') {
css.height = ${(newW * this.startH) / this.startW}px;
} else {
css.height = ${newH}px;
}
}
} else {
this.startX = x;
this.startY = y;
css = {
left: ${rect.x + offsetX}px,
top: ${rect.y + offsetY}px,
right: undefined,
bottom: undefined,
};
}
this.doAction(
{
view: {
css,
},
},
null,
!this.isScale,
);
},

initScreenK() {
if (!(getApp() && getApp().systemInfo && getApp().systemInfo.screenWidth)) {
try {
// getApp().systemInfo = wx.getSystemInfoSync();
getApp().systemInfo = wx.getAppAuthorizeSetting();
} catch (e) {
console.error(Painter get system info failed, ${JSON.stringify(e)});
return;
}
}
this.screenK = 0.5;
if (getApp() && getApp().systemInfo && getApp().systemInfo.screenWidth) {
this.screenK = getApp().systemInfo.screenWidth / 750;
}
setStringPrototype(this.screenK, this.properties.scaleRatio);
},

initDancePalette() {
if (this.properties.use2D) {
return;
}
this.isDisabled = true;
this.initScreenK();
this.downloadImages(this.properties.dancePalette).then(async palette => {
this.currentPalette = palette;
const { width, height } = palette;

if (!width || !height) {
console.error(You should set width and height correctly for painter, width: ${width}, height: ${height});
return;
}
this.setData({
painterStyle: width:${width.toPx()}px;height:${height.toPx()}px;,
});
this.frontContext || (this.frontContext = await this.getCanvasContext(this.properties.use2D, 'front'));
this.bottomContext || (this.bottomContext = await this.getCanvasContext(this.properties.use2D, 'bottom'));
this.topContext || (this.topContext = await this.getCanvasContext(this.properties.use2D, 'top'));
this.globalContext || (this.globalContext = await this.getCanvasContext(this.properties.use2D, 'k-canvas'));
new Pen(this.bottomContext, palette, this.properties.use2D).paint(() => {
this.isDisabled = false;
this.isDisabled = this.outterDisabled;
this.triggerEvent('didShow');
});
this.globalContext.draw();
this.frontContext.draw();
this.topContext.draw();
});
this.touchedView = {};
},

startPaint() {
this.initScreenK();
const { width, height } = this.properties.palette;

if (!width || !height) {
console.error(You should set width and height correctly for painter, width: ${width}, height: ${height});
return;
}

let needScale = false;
// 生成图片时，根据设置的像素值重新绘制
if (width.toPx() !== this.canvasWidthInPx) {
this.canvasWidthInPx = width.toPx();
needScale = this.properties.use2D;
}
if (this.properties.widthPixels) {
setStringPrototype(this.screenK, this.properties.widthPixels / this.canvasWidthInPx);
this.canvasWidthInPx = this.properties.widthPixels;
}

if (this.canvasHeightInPx !== height.toPx()) {
this.canvasHeightInPx = height.toPx();
needScale = needScale || this.properties.use2D;
}
this.setData(
{
photoStyle: width:${this.canvasWidthInPx}px;height:${this.canvasHeightInPx}px;,
},
function () {
this.downloadImages(this.properties.palette).then(async palette => {
if (!this.photoContext) {
this.photoContext = await this.getCanvasContext(this.properties.use2D, 'photo');
}
if (needScale) {
const scale = getApp().systemInfo.pixelRatio;
this.photoContext.width = this.canvasWidthInPx * scale;
this.photoContext.height = this.canvasHeightInPx * scale;
this.photoContext.scale(scale, scale);
}
new Pen(this.photoContext, palette).paint(() => {
this.saveImgToLocal();
});
setStringPrototype(this.screenK, this.properties.scaleRatio);
});
},
);
},

downloadImages(palette) {
return new Promise((resolve, reject) => {
let preCount = 0;
let completeCount = 0;
const paletteCopy = JSON.parse(JSON.stringify(palette));
if (paletteCopy.background) {
preCount++;
downloader.download(paletteCopy.background, this.properties.LRU).then(
path => {
paletteCopy.background = path;
completeCount++;
if (preCount === completeCount) {
resolve(paletteCopy);
}
},
() => {
completeCount++;
if (preCount === completeCount) {
resolve(paletteCopy);
}
},
);
}
if (paletteCopy.views) {
for (const view of paletteCopy.views) {
if (view && view.type === 'image' && view.url) {
preCount++;
/* eslint-disable no-loop-func */
downloader.download(view.url, this.properties.LRU).then(
path => {
view.originUrl = view.url;
view.url = path;
wx.getImageInfo({
src: path,
success: res => {
// 获得一下图片信息，供后续裁减使用
view.sWidth = res.width;
view.sHeight = res.height;
},
fail: error => {
// 如果图片坏了，则直接置空，防止坑爹的 canvas 画崩溃了
console.warn(getImageInfo ${view.originUrl} failed, ${JSON.stringify(error)});
view.url = '';
},
complete: () => {
completeCount++;
if (preCount === completeCount) {
resolve(paletteCopy);
}
},
});
},
() => {
completeCount++;
if (preCount === completeCount) {
resolve(paletteCopy);
}
},
);
}
}
}
if (preCount === 0) {
resolve(paletteCopy);
}
});
},

saveImgToLocal() {
const that = this;
const optionsOf2d = {
canvas: that.canvasNode,
}
const optionsOfOld = {
canvasId: 'photo',
destWidth: that.canvasWidthInPx,
destHeight: that.canvasHeightInPx,
}
setTimeout(() => {
wx.canvasToTempFilePath(
{
...(that.properties.use2D ? optionsOf2d : optionsOfOld),
success: function (res) {
that.getImageInfo(res.tempFilePath);
},
fail: function (error) {
console.error(canvasToTempFilePath failed, ${JSON.stringify(error)});
that.triggerEvent('imgErr', {
error: error,
});
},
},
this,
);
}, 300);
},

getCanvasContext(use2D, id) {
const that = this;
return new Promise(resolve => {
if (use2D) {
const query = wx.createSelectorQuery().in(that);
const selectId = #${id};
query
.select(selectId)
.fields({ node: true, size: true })
.exec(res => {
that.canvasNode = res[0].node;
const ctx = that.canvasNode.getContext('2d');
const wxCanvas = new WxCanvas('2d', ctx, id, true, that.canvasNode);
resolve(wxCanvas);
});
} else {
const temp = wx.createCanvasContext(id, that);
resolve(new WxCanvas('mina', temp, id, true));
}
});
},

getImageInfo(filePath) {
const that = this;
wx.getImageInfo({
src: filePath,
success: infoRes => {
if (that.paintCount > MAX_PAINT_COUNT) {
const error = The result is always fault, even we tried ${MAX_PAINT_COUNT} times;
console.error(error);
that.triggerEvent('imgErr', {
error: error,
});
return;
}
// 比例相符时才证明绘制成功，否则进行强制重绘制
if (
Math.abs(
(infoRes.width * that.canvasHeightInPx - that.canvasWidthInPx * infoRes.height) /
(infoRes.height * that.canvasHeightInPx),
) < 0.01
) {
that.triggerEvent('imgOK', {
path: filePath,
});
} else {
that.startPaint();
}
that.paintCount++;
},
fail: error => {
console.error(getImageInfo failed, ${JSON.stringify(error)});
that.triggerEvent('imgErr', {
error: error,
});
},
});
},
},
});

function setStringPrototype(screenK, scale) {
/* eslint-disable no-extend-native /
/*
* string 到对应的 px
* @param {Number} baseSize 当设置了 % 号时，设置的基准值
*/
String.prototype.toPx = function toPx(_, baseSize) {
if (this === '0') {
return 0;
}
const REG = /-?[0-9]+(.[0-9]+)?(rpx|px|%)/;

const parsePx = origin => {
const results = new RegExp(REG).exec(origin);
if (!origin || !results) {
console.error(The size: ${origin} is illegal);
return 0;
}
const unit = results[2];
const value = parseFloat(origin);

let res = 0;
if (unit === 'rpx') {
res = Math.round(value * (screenK || 0.5) * (scale || 1));
} else if (unit === 'px') {
res = Math.round(value * (scale || 1));
} else if (unit === '%') {
res = Math.round((value * baseSize) / 100);
}
return res;
};
const formula = /^calc((.+))$/.exec(this);
if (formula && formula[1]) {
// 进行 calc 计算
const afterOne = formula[1].replace(/([^\s(+-*/]+).(left|right|bottom|top|width|height)/g, word => {
const [id, attr] = word.split('.');
return penCache.viewRect[id][attr];
});
const afterTwo = afterOne.replace(new RegExp(REG, 'g'), parsePx);
return calc(afterTwo);
} else {
return parsePx(this);
}
};
}
components/painter/lib/calc.js

/* eslint-disable */
// 四则运算

!(function () {
var calculate = function (s) {
s = s.trim();
const stack = new Array();
let preSign = '+';
let numStr = '';
const n = s.length;
for (let i = 0; i < n; ++i) {
if (s[i] === '.' || (!isNaN(Number(s[i])) && s[i] !== ' ')) {
numStr += s[i];
} else if (s[i] === '(') {
let isClose = 1;
let j = i;
while (isClose > 0) {
j += 1;
if (s[j] === '(') isClose += 1;
if (s[j] === ')') isClose -= 1;
}
numStr = ${calculate(s.slice(i + 1, j))};
i = j;
}
if ((isNaN(Number(s[i])) && s[i] !== '.') || i === n - 1) {
let num = parseFloat(numStr);
switch (preSign) {
case '+':
stack.push(num);
break;
case '-':
stack.push(-num);
break;
case '*':
stack.push(stack.pop() * num);
break;
case '/':
stack.push(stack.pop() / num);
break;
default:
break;
}
preSign = s[i];
numStr = '';
}
}
let ans = 0;
while (stack.length) {
ans += stack.pop();
}
return ans;
};
module.exports = calculate;
})();
components/painter/lib/downloader.js

/**
* LRU 文件存储，使用该 downloader 可以让下载的文件存储在本地，下次进入小程序后可以直接使用
* 详细设计文档可查看 https://juejin.im/post/5b42d3ede51d4519277b6ce3
*/
const util = require('./util');
const sha1 = require('./sha1');

const SAVED_FILES_KEY = 'savedFiles';
const KEY_TOTAL_SIZE = 'totalSize';
const KEY_PATH = 'path';
const KEY_TIME = 'time';
const KEY_SIZE = 'size';

// 可存储总共为 6M，目前小程序可允许的最大本地存储为 10M
let MAX_SPACE_IN_B = 6 * 1024 * 1024;
let savedFiles = {};

export default class Dowloader {
constructor() {
// app 如果设置了最大存储空间，则使用 app 中的
if (getApp().PAINTER_MAX_LRU_SPACE) {
MAX_SPACE_IN_B = getApp().PAINTER_MAX_LRU_SPACE;
}
wx.getStorage({
key: SAVED_FILES_KEY,
success: function (res) {
if (res.data) {
savedFiles = res.data;
}
},
});
}

/**
* 下载文件，会用 lru 方式来缓存文件到本地
* @param {String} url 文件的 url
*/
download(url, lru) {
return new Promise((resolve, reject) => {
if (!(url && util.isValidUrl(url))) {
resolve(url);
return;
}
const fileName = getFileName(url);
if (!lru) {
// 无 lru 情况下直接判断临时文件是否存在，不存在重新下载
wx.getFileInfo({
filePath: fileName,
success: () => {
resolve(url);
},
fail: () => {
if (util.isOnlineUrl(url)) {
downloadFile(url, lru).then((path) => {
resolve(path);
}, () => {
reject();
});
} else if (util.isDataUrl(url)) {
transformBase64File(url, lru).then(path => {
resolve(path);
}, () => {
reject();
});
}
},
})
return
}

const file = getFile(fileName);

if (file) {
if (file[KEY_PATH].indexOf('//usr/') !== -1) {
wx.getFileInfo({
filePath: file[KEY_PATH],
success() {
resolve(file[KEY_PATH]);
},
fail(error) {
console.error(base64 file broken, ${JSON.stringify(error)});
transformBase64File(url, lru).then(path => {
resolve(path);
}, () => {
reject();
});
}
})
} else {
// 检查文件是否正常，不正常需要重新下载
wx.getSavedFileInfo({
filePath: file[KEY_PATH],
success: (res) => {
resolve(file[KEY_PATH]);
},
fail: (error) => {
console.error(the file is broken, redownload it, ${JSON.stringify(error)});
downloadFile(url, lru).then((path) => {
resolve(path);
}, () => {
reject();
});
},
});
}
} else {
if (util.isOnlineUrl(url)) {
downloadFile(url, lru).then((path) => {
resolve(path);
}, () => {
reject();
});
} else if (util.isDataUrl(url)) {
transformBase64File(url, lru).then(path => {
resolve(path);
}, () => {
reject();
});
}
}
});
}
}

function getFileName(url) {
if (util.isDataUrl(url)) {
const [, format, bodyData] = /data:image/(\w+);base64,(.*)/.exec(url) || [];
const fileName = ${sha1.hex_sha1(bodyData)}.${format};
return fileName;
} else {
return url;
}
}

function transformBase64File(base64data, lru) {
return new Promise((resolve, reject) => {
const [, format, bodyData] = /data:image/(\w+);base64,(.*)/.exec(base64data) || [];
if (!format) {
console.error('base parse failed');
reject();
return;
}
const fileName = ${sha1.hex_sha1(bodyData)}.${format};
const path = ${wx.env.USER_DATA_PATH}/${fileName};
const buffer = wx.base64ToArrayBuffer(bodyData.replace(/[\r\n]/g, ""));
wx.getFileSystemManager().writeFile({
filePath: path,
data: buffer,
encoding: 'binary',
success() {
wx.getFileInfo({
filePath: path,
success: (tmpRes) => {
const newFileSize = tmpRes.size;
lru ? doLru(newFileSize).then(() => {
saveFile(fileName, newFileSize, path, true).then((filePath) => {
resolve(filePath);
});
}, () => {
resolve(path);
}) : resolve(path);
},
fail: (error) => {
// 文件大小信息获取失败，则此文件也不要进行存储
console.error(getFileInfo ${path} failed, ${JSON.stringify(error)});
resolve(path);
},
});
},
fail(err) {
console.log(err)
}
})
});
}

function downloadFile(url, lru) {
return new Promise((resolve, reject) => {
const downloader = url.startsWith('cloud://')?wx.cloud.downloadFile:wx.downloadFile
downloader({
url: url,
fileID: url,
success: function (res) {
if (res.statusCode !== 200) {
console.error(downloadFile ${url} failed res.statusCode is not 200);
reject();
return;
}
const {
tempFilePath
} = res;
wx.getFileInfo({
filePath: tempFilePath,
success: (tmpRes) => {
const newFileSize = tmpRes.size;
lru ? doLru(newFileSize).then(() => {
saveFile(url, newFileSize, tempFilePath).then((filePath) => {
resolve(filePath);
});
}, () => {
resolve(tempFilePath);
}) : resolve(tempFilePath);
},
fail: (error) => {
// 文件大小信息获取失败，则此文件也不要进行存储
console.error(getFileInfo ${res.tempFilePath} failed, ${JSON.stringify(error)});
resolve(res.tempFilePath);
},
});
},
fail: function (error) {
console.error(downloadFile failed, ${JSON.stringify(error)} );
reject();
},
});
});
}

function saveFile(key, newFileSize, tempFilePath, isDataUrl = false) {
return new Promise((resolve, reject) => {
if (isDataUrl) {
const totalSize = savedFiles[KEY_TOTAL_SIZE] ? savedFiles[KEY_TOTAL_SIZE] : 0;
savedFiles[key] = {};
savedFiles[key][KEY_PATH] = tempFilePath;
savedFiles[key][KEY_TIME] = new Date().getTime();
savedFiles[key][KEY_SIZE] = newFileSize;
savedFiles['totalSize'] = newFileSize + totalSize;
wx.setStorage({
key: SAVED_FILES_KEY,
data: savedFiles,
});
resolve(tempFilePath);
return;
}
wx.saveFile({
tempFilePath: tempFilePath,
success: (fileRes) => {
const totalSize = savedFiles[KEY_TOTAL_SIZE] ? savedFiles[KEY_TOTAL_SIZE] : 0;
savedFiles[key] = {};
savedFiles[key][KEY_PATH] = fileRes.savedFilePath;
savedFiles[key][KEY_TIME] = new Date().getTime();
savedFiles[key][KEY_SIZE] = newFileSize;
savedFiles['totalSize'] = newFileSize + totalSize;
wx.setStorage({
key: SAVED_FILES_KEY,
data: savedFiles,
});
resolve(fileRes.savedFilePath);
},
fail: (error) => {
console.error(saveFile ${key} failed, then we delete all files, ${JSON.stringify(error)});
// 由于 saveFile 成功后，res.tempFilePath 处的文件会被移除，所以在存储未成功时，我们还是继续使用临时文件
resolve(tempFilePath);
// 如果出现错误，就直接情况本地的所有文件，因为你不知道是不是因为哪次lru的某个文件未删除成功
reset();
},
});
});
}

/**
* 清空所有下载相关内容
*/
function reset() {
wx.removeStorage({
key: SAVED_FILES_KEY,
success: () => {
wx.getSavedFileList({
success: (listRes) => {
removeFiles(listRes.fileList);
},
fail: (getError) => {
console.error(getSavedFileList failed, ${JSON.stringify(getError)});
},
});
},
});
}

function doLru(size) {
if (size > MAX_SPACE_IN_B) {
return Promise.reject()
}
return new Promise((resolve, reject) => {
let totalSize = savedFiles[KEY_TOTAL_SIZE] ? savedFiles[KEY_TOTAL_SIZE] : 0;

if (size + totalSize <= MAX_SPACE_IN_B) {
resolve();
return;
}
// 如果加上新文件后大小超过最大限制，则进行 lru
const pathsShouldDelete = [];
// 按照最后一次的访问时间，从小到大排序
const allFiles = JSON.parse(JSON.stringify(savedFiles));
delete allFiles[KEY_TOTAL_SIZE];
const sortedKeys = Object.keys(allFiles).sort((a, b) => {
return allFiles[a][KEY_TIME] - allFiles[b][KEY_TIME];
});

for (const sortedKey of sortedKeys) {
totalSize -= savedFiles[sortedKey].size;
pathsShouldDelete.push(savedFiles[sortedKey][KEY_PATH]);
delete savedFiles[sortedKey];
if (totalSize + size < MAX_SPACE_IN_B) {
break;
}
}

savedFiles['totalSize'] = totalSize;

wx.setStorage({
key: SAVED_FILES_KEY,
data: savedFiles,
success: () => {
// 保证 storage 中不会存在不存在的文件数据
if (pathsShouldDelete.length > 0) {
removeFiles(pathsShouldDelete);
}
resolve();
},
fail: (error) => {
console.error(doLru setStorage failed, ${JSON.stringify(error)});
reject();
},
});
});
}

function removeFiles(pathsShouldDelete) {
for (const pathDel of pathsShouldDelete) {
let delPath = pathDel;
if (typeof pathDel === 'object') {
delPath = pathDel.filePath;
}
if (delPath.indexOf('//usr/') !== -1) {
wx.getFileSystemManager().unlink({
filePath: delPath,
fail(error) {
console.error(removeSavedFile ${pathDel} failed, ${JSON.stringify(error)});
}
})
} else {
wx.removeSavedFile({
filePath: delPath,
fail: (error) => {
console.error(removeSavedFile ${pathDel} failed, ${JSON.stringify(error)});
},
});
}
}
}

function getFile(key) {
if (!savedFiles[key]) {
return;
}
savedFiles[key]['time'] = new Date().getTime();
wx.setStorage({
key: SAVED_FILES_KEY,
data: savedFiles,
});
return savedFiles[key];
}
components/painter/lib/gradient.js

/* eslint-disable */
// 当ctx传入当前文件，const grd = ctx.createCircularGradient() 和
// const grd = this.ctx.createLinearGradient() 无效，因此只能分开处理
// 先分析，在外部创建grd，再传入使用就可以

!(function () {

var api = {
isGradient: function(bg) {
if (bg && (bg.startsWith('linear') || bg.startsWith('radial'))) {
return true;
}
return false;
},

doGradient: function(bg, width, height, ctx) {
if (bg.startsWith('linear')) {
linearEffect(width, height, bg, ctx);
} else if (bg.startsWith('radial')) {
radialEffect(width, height, bg, ctx);
}
},
}

function analizeGrad(string) {
const colorPercents = string.substring(0, string.length - 1).split("%,");
const colors = [];
const percents = [];
for (let colorPercent of colorPercents) {
colors.push(colorPercent.substring(0, colorPercent.lastIndexOf(" ")).trim());
percents.push(colorPercent.substring(colorPercent.lastIndexOf(" "), colorPercent.length) / 100);
}
return {colors: colors, percents: percents};
}

function radialEffect(width, height, bg, ctx) {
const colorPer = analizeGrad(bg.match(/radial-gradient((.+))/)[1]);
const grd = ctx.createRadialGradient(0, 0, 0, 0, 0, width < height ? height / 2 : width / 2);
for (let i = 0; i < colorPer.colors.length; i++) {
grd.addColorStop(colorPer.percents[i], colorPer.colors[i]);
}
ctx.fillStyle = grd;
//ctx.fillRect(-(width / 2), -(height / 2), width, height);
}

function analizeLinear(bg, width, height) {
const direction = bg.match(/([-]?\d{1,3})deg/);
const dir = direction && direction[1] ? parseFloat(direction[1]) : 0;
let coordinate;
switch (dir) {
case 0: coordinate = [0, -height / 2, 0, height / 2]; break;
case 90: coordinate = [width / 2, 0, -width / 2, 0]; break;
case -90: coordinate = [-width / 2, 0, width / 2, 0]; break;
case 180: coordinate = [0, height / 2, 0, -height / 2]; break;
case -180: coordinate = [0, -height / 2, 0, height / 2]; break;
default:
let x1 = 0;
let y1 = 0;
let x2 = 0;
let y2 = 0;
if (direction[1] > 0 && direction[1] < 90) {
x1 = (width / 2) - ((width / 2) * Math.tan((90 - direction[1]) * Math.PI * 2 / 360) - height / 2) * Math.sin(2 * (90 - direction[1]) * Math.PI * 2 / 360) / 2;
y2 = Math.tan((90 - direction[1]) * Math.PI * 2 / 360) * x1;
x2 = -x1;
y1 = -y2;
} else if (direction[1] > -180 && direction[1] < -90) {
x1 = -(width / 2) + ((width / 2) * Math.tan((90 - direction[1]) * Math.PI * 2 / 360) - height / 2) * Math.sin(2 * (90 - direction[1]) * Math.PI * 2 / 360) / 2;
y2 = Math.tan((90 - direction[1]) * Math.PI * 2 / 360) * x1;
x2 = -x1;
y1 = -y2;
} else if (direction[1] > 90 && direction[1] < 180) {
x1 = (width / 2) + (-(width / 2) * Math.tan((90 - direction[1]) * Math.PI * 2 / 360) - height / 2) * Math.sin(2 * (90 - direction[1]) * Math.PI * 2 / 360) / 2;
y2 = Math.tan((90 - direction[1]) * Math.PI * 2 / 360) * x1;
x2 = -x1;
y1 = -y2;
} else {
x1 = -(width / 2) - (-(width / 2) * Math.tan((90 - direction[1]) * Math.PI * 2 / 360) - height / 2) * Math.sin(2 * (90 - direction[1]) * Math.PI * 2 / 360) / 2;
y2 = Math.tan((90 - direction[1]) * Math.PI * 2 / 360) * x1;
x2 = -x1;
y1 = -y2;
}
coordinate = [x1, y1, x2, y2];
break;
}
return coordinate;
}

function linearEffect(width, height, bg, ctx) {
const param = analizeLinear(bg, width, height);
const grd = ctx.createLinearGradient(param[0], param[1], param[2], param[3]);
const content = bg.match(/linear-gradient((.+))/)[1];
const colorPer = analizeGrad(content.substring(content.indexOf(',') + 1));
for (let i = 0; i < colorPer.colors.length; i++) {
grd.addColorStop(colorPer.percents[i], colorPer.colors[i]);
}
ctx.fillStyle = grd
//ctx.fillRect(-(width / 2), -(height / 2), width, height);
}

module.exports = { api }

})();
components/painter/lib/pen.js

const QR = require('./qrcode.js');
const GD = require('./gradient.js');
require('./string-polyfill.js');

export const penCache = {
// 用于存储带 id 的 view 的 rect 信息
viewRect: {},
textLines: {},
};
export const clearPenCache = id => {
if (id) {
penCache.viewRect[id] = null;
penCache.textLines[id] = null;
} else {
penCache.viewRect = {};
penCache.textLines = {};
}
};
export default class Painter {
constructor(ctx, data) {
this.ctx = ctx;
this.data = data;
}

paint(callback) {
this.style = {
width: this.data.width.toPx(),
height: this.data.height.toPx(),
};

this._background();
for (const view of this.data.views) {
this._drawAbsolute(view);
}
this.ctx.draw(false, () => {
callback && callback();
});
}

_background() {
this.ctx.save();
const { width, height } = this.style;
const bg = this.data.background;
this.ctx.translate(width / 2, height / 2);

this._doClip(this.data.borderRadius, width, height);
if (!bg) {
// 如果未设置背景，则默认使用透明色
this.ctx.fillStyle = 'transparent';
this.ctx.fillRect(-(width / 2), -(height / 2), width, height);
} else if (bg.startsWith('#') || bg.startsWith('rgba') || bg.toLowerCase() === 'transparent') {
// 背景填充颜色
this.ctx.fillStyle = bg;
this.ctx.fillRect(-(width / 2), -(height / 2), width, height);
} else if (GD.api.isGradient(bg)) {
GD.api.doGradient(bg, width, height, this.ctx);
this.ctx.fillRect(-(width / 2), -(height / 2), width, height);
} else {
// 背景填充图片
this.ctx.drawImage(bg, -(width / 2), -(height / 2), width, height);
}
this.ctx.restore();
}

_drawAbsolute(view) {
if (!(view && view.type)) {
// 过滤无效 view
return;
}
// 证明 css 为数组形式，需要合并
if (view.css && view.css.length) {
/* eslint-disable no-param-reassign */
view.css = Object.assign(...view.css);
}
switch (view.type) {
case 'image':
this._drawAbsImage(view);
break;
case 'text':
this._fillAbsText(view);
break;
case 'inlineText':
this._fillAbsInlineText(view);
break;
case 'rect':
this._drawAbsRect(view);
break;
case 'qrcode':
this._drawQRCode(view);
break;
default:
break;
}
}

_border({ borderRadius = 0, width, height, borderWidth = 0, borderStyle = 'solid' }) {
let r1 = 0,
r2 = 0,
r3 = 0,
r4 = 0;
const minSize = Math.min(width, height);
if (borderRadius) {
const border = borderRadius.split(/\s+/);
if (border.length === 4) {
r1 = Math.min(border[0].toPx(false, minSize), width / 2, height / 2);
r2 = Math.min(border[1].toPx(false, minSize), width / 2, height / 2);
r3 = Math.min(border[2].toPx(false, minSize), width / 2, height / 2);
r4 = Math.min(border[3].toPx(false, minSize), width / 2, height / 2);
} else {
r1 = r2 = r3 = r4 = Math.min(borderRadius && borderRadius.toPx(false, minSize), width / 2, height / 2);
}
}
const lineWidth = borderWidth && borderWidth.toPx(false, minSize);
this.ctx.lineWidth = lineWidth;
if (borderStyle === 'dashed') {
this.ctx.setLineDash([(lineWidth * 4) / 3, (lineWidth * 4) / 3]);
// this.ctx.lineDashOffset = 2 * lineWidth
} else if (borderStyle === 'dotted') {
this.ctx.setLineDash([lineWidth, lineWidth]);
}
const notSolid = borderStyle !== 'solid';
this.ctx.beginPath();

notSolid && r1 === 0 && this.ctx.moveTo(-width / 2 - lineWidth, -height / 2 - lineWidth / 2); // 顶边虚线规避重叠规则
r1 !== 0 && this.ctx.arc(-width / 2 + r1, -height / 2 + r1, r1 + lineWidth / 2, 1 * Math.PI, 1.5 * Math.PI); //左上角圆弧
this.ctx.lineTo(
r2 === 0 ? (notSolid ? width / 2 : width / 2 + lineWidth / 2) : width / 2 - r2,
-height / 2 - lineWidth / 2,
); // 顶边线

notSolid && r2 === 0 && this.ctx.moveTo(width / 2 + lineWidth / 2, -height / 2 - lineWidth); // 右边虚线规避重叠规则
r2 !== 0 && this.ctx.arc(width / 2 - r2, -height / 2 + r2, r2 + lineWidth / 2, 1.5 * Math.PI, 2 * Math.PI); // 右上角圆弧
this.ctx.lineTo(
width / 2 + lineWidth / 2,
r3 === 0 ? (notSolid ? height / 2 : height / 2 + lineWidth / 2) : height / 2 - r3,
); // 右边线

notSolid && r3 === 0 && this.ctx.moveTo(width / 2 + lineWidth, height / 2 + lineWidth / 2); // 底边虚线规避重叠规则
r3 !== 0 && this.ctx.arc(width / 2 - r3, height / 2 - r3, r3 + lineWidth / 2, 0, 0.5 * Math.PI); // 右下角圆弧
this.ctx.lineTo(
r4 === 0 ? (notSolid ? -width / 2 : -width / 2 - lineWidth / 2) : -width / 2 + r4,
height / 2 + lineWidth / 2,
); // 底边线

notSolid && r4 === 0 && this.ctx.moveTo(-width / 2 - lineWidth / 2, height / 2 + lineWidth); // 左边虚线规避重叠规则
r4 !== 0 && this.ctx.arc(-width / 2 + r4, height / 2 - r4, r4 + lineWidth / 2, 0.5 * Math.PI, 1 * Math.PI); // 左下角圆弧
this.ctx.lineTo(
-width / 2 - lineWidth / 2,
r1 === 0 ? (notSolid ? -height / 2 : -height / 2 - lineWidth / 2) : -height / 2 + r1,
); // 左边线
notSolid && r1 === 0 && this.ctx.moveTo(-width / 2 - lineWidth, -height / 2 - lineWidth / 2); // 顶边虚线规避重叠规则

if (!notSolid) {
this.ctx.closePath();
}
}

/**
* 根据 borderRadius 进行裁减
*/
_doClip(borderRadius, width, height, borderStyle) {
if (borderRadius && width && height) {
// 防止在某些机型上周边有黑框现象，此处如果直接设置 fillStyle 为透明，在 Android 机型上会导致被裁减的图片也变为透明， iOS 和 IDE 上不会
// globalAlpha 在 1.9.90 起支持，低版本下无效，但把 fillStyle 设为了 white，相对默认的 black 要好点
this.ctx.globalAlpha = 0;
this.ctx.fillStyle = 'white';
this._border({
borderRadius,
width,
height,
borderStyle,
});
this.ctx.fill();
// 在 ios 的 6.6.6 版本上 clip 有 bug，禁掉此类型上的 clip，也就意味着，在此版本微信的 ios 设备下无法使用 border 属性
if (!(getApp().systemInfo && getApp().systemInfo.version <= '6.6.6' && getApp().systemInfo.platform === 'ios')) {
this.ctx.clip();
}
this.ctx.globalAlpha = 1;
}
}

/**
* 画边框
*/
_doBorder(view, width, height) {
if (!view.css) {
return;
}
const { borderRadius, borderWidth, borderColor, borderStyle } = view.css;
if (!borderWidth) {
return;
}
this.ctx.save();
this._preProcess(view, true);
this.ctx.strokeStyle = borderColor || 'black';
this._border({
borderRadius,
width,
height,
borderWidth,
borderStyle,
});
this.ctx.stroke();
this.ctx.restore();
}

_preProcess(view, notClip) {
let width = 0;
let height;
let extra;
const paddings = this._doPaddings(view);
switch (view.type) {
case 'inlineText': {
{
// 计算行数
let lines = 0;
// 文字总长度
let textLength = 0;
// 行高
let lineHeight = 0;
const textList = view.textList || [];
for (let i = 0; i < textList.length; i++) {
let subView = textList[i];
const fontWeight = subView.css.fontWeight || '400';
const textStyle = subView.css.textStyle || 'normal';
if (!subView.css.fontSize) {
subView.css.fontSize = '20rpx';
}
this.ctx.font = ${textStyle} ${fontWeight} ${subView.css.fontSize.toPx()}px "${subView.css.fontFamily || 'sans-serif'}";
textLength += this.ctx.measureText(subView.text).width;
let tempLineHeight = subView.css.lineHeight ? subView.css.lineHeight.toPx() : subView.css.fontSize.toPx();
lineHeight = Math.max(lineHeight, tempLineHeight);
}
width = view.css.width ? view.css.width.toPx(false, this.style.width) - paddings[1] - paddings[3] : textLength;;
const calLines = Math.ceil(textLength / width);

lines += calLines;
// lines = view.css.maxLines < lines ? view.css.maxLines : lines;
height = lineHeight * lines;
extra = {
lines: lines,
lineHeight: lineHeight,
// textArray: textArray,
// linesArray: linesArray,
};
}
break;
}
case 'text': {
const textArray = String(view.text).split('\n');
// 处理多个连续的'\n'
for (let i = 0; i < textArray.length; ++i) {
if (textArray[i] === '') {
textArray[i] = ' ';
}
}
const fontWeight = view.css.fontWeight || '400';
const textStyle = view.css.textStyle || 'normal';
if (!view.css.fontSize) {
view.css.fontSize = '20rpx';
}
this.ctx.font = ${textStyle} ${fontWeight} ${view.css.fontSize.toPx()}px "${ view.css.fontFamily || 'sans-serif' }";
// 计算行数
let lines = 0;
const linesArray = [];
for (let i = 0; i < textArray.length; ++i) {
const textLength = this.ctx.measureText(textArray[i]).width;
const minWidth = view.css.fontSize.toPx() + paddings[1] + paddings[3];
let partWidth = view.css.width
? view.css.width.toPx(false, this.style.width) - paddings[1] - paddings[3]
: textLength;
if (partWidth < minWidth) {
partWidth = minWidth;
}
const calLines = Math.ceil(textLength / partWidth);
// 取最长的作为 width
width = partWidth > width ? partWidth : width;
lines += calLines;
linesArray[i] = calLines;
}
lines = view.css.maxLines < lines ? view.css.maxLines : lines;
const lineHeight = view.css.lineHeight ? view.css.lineHeight.toPx() : view.css.fontSize.toPx();
height = lineHeight * lines;
extra = {
lines: lines,
lineHeight: lineHeight,
textArray: textArray,
linesArray: linesArray,
};
break;
}
case 'image': {
// image的长宽设置成auto的逻辑处理
const ratio = getApp().systemInfo.pixelRatio ? getApp().systemInfo.pixelRatio : 2;
// 有css却未设置width或height，则默认为auto
if (view.css) {
if (!view.css.width) {
view.css.width = 'auto';
}
if (!view.css.height) {
view.css.height = 'auto';
}
}
if (!view.css || (view.css.width === 'auto' && view.css.height === 'auto')) {
width = Math.round(view.sWidth / ratio);
height = Math.round(view.sHeight / ratio);
} else if (view.css.width === 'auto') {
height = view.css.height.toPx(false, this.style.height);
width = (view.sWidth / view.sHeight) * height;
} else if (view.css.height === 'auto') {
width = view.css.width.toPx(false, this.style.width);
height = (view.sHeight / view.sWidth) * width;
} else {
width = view.css.width.toPx(false, this.style.width);
height = view.css.height.toPx(false, this.style.height);
}
break;
}
default:
if (!(view.css.width && view.css.height)) {
console.error('You should set width and height');
return;
}
width = view.css.width.toPx(false, this.style.width);
height = view.css.height.toPx(false, this.style.height);
break;
}
let x;
if (view.css && view.css.right) {
if (typeof view.css.right === 'string') {
x = this.style.width - view.css.right.toPx(true, this.style.width);
} else {
// 可以用数组方式，把文字长度计算进去
// [right, 文字id, 乘数（默认 1）]
const rights = view.css.right;
x =
this.style.width -
rights[0].toPx(true, this.style.width) -
penCache.viewRect[rights[1]].width * (rights[2] || 1);
}
} else if (view.css && view.css.left) {
if (typeof view.css.left === 'string') {
x = view.css.left.toPx(true, this.style.width);
} else {
const lefts = view.css.left;
x = lefts[0].toPx(true, this.style.width) + penCache.viewRect[lefts[1]].width * (lefts[2] || 1);
}
} else {
x = 0;
}
//const y = view.css && view.css.bottom ? this.style.height - height - view.css.bottom.toPx(true) : (view.css && view.css.top ? view.css.top.toPx(true) : 0);
let y;
if (view.css && view.css.bottom) {
y = this.style.height - height - view.css.bottom.toPx(true, this.style.height);
} else {
if (view.css && view.css.top) {
if (typeof view.css.top === 'string') {
y = view.css.top.toPx(true, this.style.height);
} else {
const tops = view.css.top;
y = tops[0].toPx(true, this.style.height) + penCache.viewRect[tops[1]].height * (tops[2] || 1);
}
} else {
y = 0;
}
}

const angle = view.css && view.css.rotate ? this._getAngle(view.css.rotate) : 0;
// 当设置了 right 时，默认 align 用 right，反之用 left
const align = view.css && view.css.align ? view.css.align : view.css && view.css.right ? 'right' : 'left';
const verticalAlign = view.css && view.css.verticalAlign ? view.css.verticalAlign : 'top';
// 记录绘制时的画布
let xa = 0;
switch (align) {
case 'center':
xa = x;
break;
case 'right':
xa = x - width / 2;
break;
default:
xa = x + width / 2;
break;
}
let ya = 0;
switch (verticalAlign) {
case 'center':
ya = y;
break;
case 'bottom':
ya = y - height / 2;
break;
default:
ya = y + height / 2;
break;
}
this.ctx.translate(xa, ya);
// 记录该 view 的有效点击区域
// TODO ，旋转和裁剪的判断
// 记录在真实画布上的左侧
let left = x;
if (align === 'center') {
left = x - width / 2;
} else if (align === 'right') {
left = x - width;
}
var top = y;
if (verticalAlign === 'center') {
top = y - height / 2;
} else if (verticalAlign === 'bottom') {
top = y - height;
}
if (view.rect) {
view.rect.left = left;
view.rect.top = top;
view.rect.right = left + width;
view.rect.bottom = top + height;
view.rect.x = view.css && view.css.right ? x - width : x;
view.rect.y = y;
} else {
view.rect = {
left: left,
top: top,
right: left + width,
bottom: top + height,
x: view.css && view.css.right ? x - width : x,
y: y,
};
}

view.rect.left = view.rect.left - paddings[3];
view.rect.top = view.rect.top - paddings[0];
view.rect.right = view.rect.right + paddings[1];
view.rect.bottom = view.rect.bottom + paddings[2];
if (view.type === 'text') {
view.rect.minWidth = view.css.fontSize.toPx() + paddings[1] + paddings[3];
}

this.ctx.rotate(angle);
if (!notClip && view.css && view.css.borderRadius && view.type !== 'rect') {
this._doClip(view.css.borderRadius, width, height, view.css.borderStyle);
}
this._doShadow(view);
if (view.id) {
penCache.viewRect[view.id] = {
width,
height,
left: view.rect.left,
top: view.rect.top,
right: view.rect.right,
bottom: view.rect.bottom,
};
}
return {
width: width,
height: height,
x: x,
y: y,
extra: extra,
};
}

_doPaddings(view) {
const { padding } = view.css ? view.css : {};
let pd = [0, 0, 0, 0];
if (padding) {
const pdg = padding.split(/\s+/);
if (pdg.length === 1) {
const x = pdg[0].toPx();
pd = [x, x, x, x];
}
if (pdg.length === 2) {
const x = pdg[0].toPx();
const y = pdg[1].toPx();
pd = [x, y, x, y];
}
if (pdg.length === 3) {
const x = pdg[0].toPx();
const y = pdg[1].toPx();
const z = pdg[2].toPx();
pd = [x, y, z, y];
}
if (pdg.length === 4) {
const x = pdg[0].toPx();
const y = pdg[1].toPx();
const z = pdg[2].toPx();
const a = pdg[3].toPx();
pd = [x, y, z, a];
}
}
return pd;
}

// 画文字的背景图片
_doBackground(view) {
this.ctx.save();
const { width: rawWidth, height: rawHeight } = this._preProcess(view, true);

const { background } = view.css;
let pd = this._doPaddings(view);
const width = rawWidth + pd[1] + pd[3];
const height = rawHeight + pd[0] + pd[2];

this._doClip(view.css.borderRadius, width, height, view.css.borderStyle);
if (GD.api.isGradient(background)) {
GD.api.doGradient(background, width, height, this.ctx);
} else {
this.ctx.fillStyle = background;
}
this.ctx.fillRect(-(width / 2), -(height / 2), width, height);

this.ctx.restore();
}

_drawQRCode(view) {
this.ctx.save();
const { width, height } = this._preProcess(view);
QR.api.draw(view.content, this.ctx, -width / 2, -height / 2, width, height, view.css.background, view.css.color);
this.ctx.restore();
this._doBorder(view, width, height);
}

_drawAbsImage(view) {
if (!view.url) {
return;
}
this.ctx.save();
const { width, height } = this._preProcess(view);
// 获得缩放到图片大小级别的裁减框
let rWidth = view.sWidth;
let rHeight = view.sHeight;
let startX = 0;
let startY = 0;
// 绘画区域比例
const cp = width / height;
// 原图比例
const op = view.sWidth / view.sHeight;
if (cp >= op) {
rHeight = rWidth / cp;
startY = Math.round((view.sHeight - rHeight) / 2);
} else {
rWidth = rHeight * cp;
startX = Math.round((view.sWidth - rWidth) / 2);
}
if (view.css && view.css.mode === 'scaleToFill') {
this.ctx.drawImage(view.url, -(width / 2), -(height / 2), width, height);
} else {
this.ctx.drawImage(view.url, startX, startY, rWidth, rHeight, -(width / 2), -(height / 2), width, height);
view.rect.startX = startX / view.sWidth;
view.rect.startY = startY / view.sHeight;
view.rect.endX = (startX + rWidth) / view.sWidth;
view.rect.endY = (startY + rHeight) / view.sHeight;
}
this.ctx.restore();
this._doBorder(view, width, height);
}
/**
*
* @param {*} view
* @description 一行内文字多样式的方法
*
* 暂不支持配置 text-align，默认left
* 暂不支持配置 maxLines
*/
_fillAbsInlineText(view) {
if (!view.textList) {
return;
}
if (view.css.background) {
// 生成背景
this._doBackground(view);
}
this.ctx.save();
const { width, height, extra } = this._preProcess(view, view.css.background && view.css.borderRadius);
const { lines, lineHeight } = extra;
let staticX = -(width / 2);
let lineIndex = 0; // 第几行
let x = staticX; // 开始x位置
let leftWidth = width; // 当前行剩余多少宽度可以使用

let getStyle = css => {
const fontWeight = css.fontWeight || '400';
const textStyle = css.textStyle || 'normal';
if (!css.fontSize) {
css.fontSize = '20rpx';
}
return ${textStyle} ${fontWeight} ${css.fontSize.toPx()}px "${css.fontFamily || 'sans-serif'}";
}

// 遍历行内的文字数组
for (let j = 0; j < view.textList.length; j++) {
const subView = view.textList[j];

// 某个文字开始位置
let start = 0;
// 文字已使用的数量
let alreadyCount = 0;
// 文字总长度
let textLength = subView.text.length;
// 文字总宽度
let textWidth = this.ctx.measureText(subView.text).width;
// 每个文字的平均宽度
let preWidth = Math.ceil(textWidth / textLength);

// 循环写文字
while (alreadyCount < textLength) {
// alreadyCount - start + 1 -> 当前摘取出来的文字
// 比较可用宽度，寻找最大可写文字长度
while ((alreadyCount - start + 1) * preWidth < leftWidth && alreadyCount < textLength) {
alreadyCount++;
}

// 取出文字
let text = subView.text.substr(start, alreadyCount - start);

const y = -(height / 2) + subView.css.fontSize.toPx() + lineIndex * lineHeight;

// 设置文字样式
this.ctx.font = getStyle(subView.css);

this.ctx.fillStyle = subView.css.color || 'black';
this.ctx.textAlign = 'left';

// 执行画布操作
if (subView.css.textStyle === 'stroke') {
this.ctx.strokeText(text, x, y);
} else {
this.ctx.fillText(text, x, y);
}

// 当次已使用宽度
let currentUsedWidth = this.ctx.measureText(text).width;

const fontSize = subView.css.fontSize.toPx();

// 画 textDecoration
let textDecoration;
if (subView.css.textDecoration) {
this.ctx.lineWidth = fontSize / 13;
this.ctx.beginPath();
if (/\bunderline\b/.test(subView.css.textDecoration)) {
this.ctx.moveTo(x, y);
this.ctx.lineTo(x + currentUsedWidth, y);
textDecoration = {
moveTo: [x, y],
lineTo: [x + currentUsedWidth, y],
};
}
if (/\boverline\b/.test(subView.css.textDecoration)) {
this.ctx.moveTo(x, y - fontSize);
this.ctx.lineTo(x + currentUsedWidth, y - fontSize);
textDecoration = {
moveTo: [x, y - fontSize],
lineTo: [x + currentUsedWidth, y - fontSize],
};
}
if (/\bline-through\b/.test(subView.css.textDecoration)) {
this.ctx.moveTo(x, y - fontSize / 3);
this.ctx.lineTo(x + currentUsedWidth, y - fontSize / 3);
textDecoration = {
moveTo: [x, y - fontSize / 3],
lineTo: [x + currentUsedWidth, y - fontSize / 3],
};
}
this.ctx.closePath();
this.ctx.strokeStyle = subView.css.color;
this.ctx.stroke();
}

// 重置数据
start = alreadyCount;
leftWidth -= currentUsedWidth;
x += currentUsedWidth;
// 如果剩余宽度小于等于0 或者小于一个字的平均宽度，换行
if (leftWidth <= 0 || leftWidth < preWidth) {
leftWidth = width;
x = staticX;
lineIndex++;
}
}
}

this.ctx.restore();
this._doBorder(view, width, height);
}

_fillAbsText(view) {
if (!view.text) {
return;
}
if (view.css.background) {
// 生成背景
this._doBackground(view);
}
this.ctx.save();
const { width, height, extra } = this._preProcess(view, view.css.background && view.css.borderRadius);
this.ctx.fillStyle = view.css.color || 'black';
if (view.id && penCache.textLines[view.id]) {
this.ctx.textAlign = view.css.textAlign ? view.css.textAlign : 'left';
for (const i of penCache.textLines[view.id]) {
const { measuredWith, text, x, y, textDecoration } = i;
if (view.css.textStyle === 'stroke') {
this.ctx.strokeText(text, x, y, measuredWith);
} else {
this.ctx.fillText(text, x, y, measuredWith);
}
if (textDecoration) {
const fontSize = view.css.fontSize.toPx();
this.ctx.lineWidth = fontSize / 13;
this.ctx.beginPath();
this.ctx.moveTo(...textDecoration.moveTo);
this.ctx.lineTo(...textDecoration.lineTo);
this.ctx.closePath();
this.ctx.strokeStyle = view.css.color;
this.ctx.stroke();
}
}
} else {
const { lines, lineHeight, textArray, linesArray } = extra;
// 如果设置了id，则保留 text 的长度
if (view.id) {
let textWidth = 0;
for (let i = 0; i < textArray.length; ++i) {
const _w = this.ctx.measureText(textArray[i]).width;
textWidth = _w > textWidth ? _w : textWidth;
}
penCache.viewRect[view.id].width = width ? (textWidth < width ? textWidth : width) : textWidth;
}
let lineIndex = 0;
for (let j = 0; j < textArray.length; ++j) {
const preLineLength = Math.ceil(textArray[j].length / linesArray[j]);
let start = 0;
let alreadyCount = 0;

for (let i = 0; i < linesArray[j]; ++i) {
// 绘制行数大于最大行数，则直接跳出循环
if (lineIndex >= lines) {
break;
}
alreadyCount = preLineLength;
let text = textArray[j].substr(start, alreadyCount);
let measuredWith = this.ctx.measureText(text).width;
// 如果测量大小小于width一个字符的大小，则进行补齐，如果测量大小超出 width，则进行减除
// 如果已经到文本末尾，也不要进行该循环
while (
start + alreadyCount <= textArray[j].length &&
(width - measuredWith > view.css.fontSize.toPx() || measuredWith - width > view.css.fontSize.toPx())
) {
if (measuredWith < width) {
text = textArray[j].substr(start, ++alreadyCount);
} else {
if (text.length <= 1) {
// 如果只有一个字符时，直接跳出循环
break;
}
text = textArray[j].substr(start, --alreadyCount);
// break;
}
measuredWith = this.ctx.measureText(text).width;
}
start += text.length;
// 如果是最后一行了，发现还有未绘制完的内容，则加...
if (lineIndex === lines - 1 && (j < textArray.length - 1 || start < textArray[j].length)) {
while (this.ctx.measureText(${text}...).width > width) {
if (text.length <= 1) {
// 如果只有一个字符时，直接跳出循环
break;
}
text = text.substring(0, text.length - 1);
}
text += '...';
measuredWith = this.ctx.measureText(text).width;
}
this.ctx.textAlign = view.css.textAlign ? view.css.textAlign : 'left';
let x;
let lineX;
switch (view.css.textAlign) {
case 'center':
x = 0;
lineX = x - measuredWith / 2;
break;
case 'right':
x = width / 2;
lineX = x - measuredWith;
break;
default:
x = -(width / 2);
lineX = x;
break;
}

const y =
-(height / 2) +
(lineIndex === 0 ? view.css.fontSize.toPx() : view.css.fontSize.toPx() + lineIndex * lineHeight);
lineIndex++;
if (view.css.textStyle === 'stroke') {
this.ctx.strokeText(text, x, y, measuredWith);
} else {
this.ctx.fillText(text, x, y, measuredWith);
}
const fontSize = view.css.fontSize.toPx();
let textDecoration;
if (view.css.textDecoration) {
this.ctx.lineWidth = fontSize / 13;
this.ctx.beginPath();
if (/\bunderline\b/.test(view.css.textDecoration)) {
this.ctx.moveTo(lineX, y);
this.ctx.lineTo(lineX + measuredWith, y);
textDecoration = {
moveTo: [lineX, y],
lineTo: [lineX + measuredWith, y],
};
}
if (/\boverline\b/.test(view.css.textDecoration)) {
this.ctx.moveTo(lineX, y - fontSize);
this.ctx.lineTo(lineX + measuredWith, y - fontSize);
textDecoration = {
moveTo: [lineX, y - fontSize],
lineTo: [lineX + measuredWith, y - fontSize],
};
}
if (/\bline-through\b/.test(view.css.textDecoration)) {
this.ctx.moveTo(lineX, y - fontSize / 3);
this.ctx.lineTo(lineX + measuredWith, y - fontSize / 3);
textDecoration = {
moveTo: [lineX, y - fontSize / 3],
lineTo: [lineX + measuredWith, y - fontSize / 3],
};
}
this.ctx.closePath();
this.ctx.strokeStyle = view.css.color;
this.ctx.stroke();
}
if (view.id) {
penCache.textLines[view.id]
? penCache.textLines[view.id].push({
text,
x,
y,
measuredWith,
textDecoration,
})
: (penCache.textLines[view.id] = [
{
text,
x,
y,
measuredWith,
textDecoration,
},
]);
}
}
}
}
this.ctx.restore();
this._doBorder(view, width, height);
}

_drawAbsRect(view) {
this.ctx.save();
const { width, height } = this._preProcess(view);
if (GD.api.isGradient(view.css.color)) {
GD.api.doGradient(view.css.color, width, height, this.ctx);
} else {
this.ctx.fillStyle = view.css.color;
}
const { borderRadius, borderStyle, borderWidth } = view.css;
this._border({
borderRadius,
width,
height,
borderWidth,
borderStyle,
});
this.ctx.fill();
this.ctx.restore();
this._doBorder(view, width, height);
}

// shadow 支持 (x, y, blur, color), 不支持 spread
// shadow:0px 0px 10px rgba(0,0,0,0.1);
_doShadow(view) {
if (!view.css || !view.css.shadow) {
return;
}
const box = view.css.shadow.replace(/,\s+/g, ',').split(/\s+/);
if (box.length > 4) {
console.error("shadow don't spread option");
return;
}
this.ctx.shadowOffsetX = parseInt(box[0], 10);
this.ctx.shadowOffsetY = parseInt(box[1], 10);
this.ctx.shadowBlur = parseInt(box[2], 10);
this.ctx.shadowColor = box[3];
}

_getAngle(angle) {
return (Number(angle) * Math.PI) / 180;
}
}
components/painter/lib/qrcode.js

/* eslint-disable */
!(function () {

// alignment pattern
var adelta = [
0, 11, 15, 19, 23, 27, 31,
16, 18, 20, 22, 24, 26, 28, 20, 22, 24, 24, 26, 28, 28, 22, 24, 24,
26, 26, 28, 28, 24, 24, 26, 26, 26, 28, 28, 24, 26, 26, 26, 28, 28
];

// version block
var vpat = [
0xc94, 0x5bc, 0xa99, 0x4d3, 0xbf6, 0x762, 0x847, 0x60d,
0x928, 0xb78, 0x45d, 0xa17, 0x532, 0x9a6, 0x683, 0x8c9,
0x7ec, 0xec4, 0x1e1, 0xfab, 0x08e, 0xc1a, 0x33f, 0xd75,
0x250, 0x9d5, 0x6f0, 0x8ba, 0x79f, 0xb0b, 0x42e, 0xa64,
0x541, 0xc69
];

// final format bits with mask: level << 3 | mask
var fmtword = [
0x77c4, 0x72f3, 0x7daa, 0x789d, 0x662f, 0x6318, 0x6c41, 0x6976, //L
0x5412, 0x5125, 0x5e7c, 0x5b4b, 0x45f9, 0x40ce, 0x4f97, 0x4aa0, //M
0x355f, 0x3068, 0x3f31, 0x3a06, 0x24b4, 0x2183, 0x2eda, 0x2bed, //Q
0x1689, 0x13be, 0x1ce7, 0x19d0, 0x0762, 0x0255, 0x0d0c, 0x083b //H
];

// 4 per version: number of blocks 1,2; data width; ecc width
var eccblocks = [
1, 0, 19, 7, 1, 0, 16, 10, 1, 0, 13, 13, 1, 0, 9, 17,
1, 0, 34, 10, 1, 0, 28, 16, 1, 0, 22, 22, 1, 0, 16, 28,
1, 0, 55, 15, 1, 0, 44, 26, 2, 0, 17, 18, 2, 0, 13, 22,
1, 0, 80, 20, 2, 0, 32, 18, 2, 0, 24, 26, 4, 0, 9, 16,
1, 0, 108, 26, 2, 0, 43, 24, 2, 2, 15, 18, 2, 2, 11, 22,
2, 0, 68, 18, 4, 0, 27, 16, 4, 0, 19, 24, 4, 0, 15, 28,
2, 0, 78, 20, 4, 0, 31, 18, 2, 4, 14, 18, 4, 1, 13, 26,
2, 0, 97, 24, 2, 2, 38, 22, 4, 2, 18, 22, 4, 2, 14, 26,
2, 0, 116, 30, 3, 2, 36, 22, 4, 4, 16, 20, 4, 4, 12, 24,
2, 2, 68, 18, 4, 1, 43, 26, 6, 2, 19, 24, 6, 2, 15, 28,
4, 0, 81, 20, 1, 4, 50, 30, 4, 4, 22, 28, 3, 8, 12, 24,
2, 2, 92, 24, 6, 2, 36, 22, 4, 6, 20, 26, 7, 4, 14, 28,
4, 0, 107, 26, 8, 1, 37, 22, 8, 4, 20, 24, 12, 4, 11, 22,
3, 1, 115, 30, 4, 5, 40, 24, 11, 5, 16, 20, 11, 5, 12, 24,
5, 1, 87, 22, 5, 5, 41, 24, 5, 7, 24, 30, 11, 7, 12, 24,
5, 1, 98, 24, 7, 3, 45, 28, 15, 2, 19, 24, 3, 13, 15, 30,
1, 5, 107, 28, 10, 1, 46, 28, 1, 15, 22, 28, 2, 17, 14, 28,
5, 1, 120, 30, 9, 4, 43, 26, 17, 1, 22, 28, 2, 19, 14, 28,
3, 4, 113, 28, 3, 11, 44, 26, 17, 4, 21, 26, 9, 16, 13, 26,
3, 5, 107, 28, 3, 13, 41, 26, 15, 5, 24, 30, 15, 10, 15, 28,
4, 4, 116, 28, 17, 0, 42, 26, 17, 6, 22, 28, 19, 6, 16, 30,
2, 7, 111, 28, 17, 0, 46, 28, 7, 16, 24, 30, 34, 0, 13, 24,
4, 5, 121, 30, 4, 14, 47, 28, 11, 14, 24, 30, 16, 14, 15, 30,
6, 4, 117, 30, 6, 14, 45, 28, 11, 16, 24, 30, 30, 2, 16, 30,
8, 4, 106, 26, 8, 13, 47, 28, 7, 22, 24, 30, 22, 13, 15, 30,
10, 2, 114, 28, 19, 4, 46, 28, 28, 6, 22, 28, 33, 4, 16, 30,
8, 4, 122, 30, 22, 3, 45, 28, 8, 26, 23, 30, 12, 28, 15, 30,
3, 10, 117, 30, 3, 23, 45, 28, 4, 31, 24, 30, 11, 31, 15, 30,
7, 7, 116, 30, 21, 7, 45, 28, 1, 37, 23, 30, 19, 26, 15, 30,
5, 10, 115, 30, 19, 10, 47, 28, 15, 25, 24, 30, 23, 25, 15, 30,
13, 3, 115, 30, 2, 29, 46, 28, 42, 1, 24, 30, 23, 28, 15, 30,
17, 0, 115, 30, 10, 23, 46, 28, 10, 35, 24, 30, 19, 35, 15, 30,
17, 1, 115, 30, 14, 21, 46, 28, 29, 19, 24, 30, 11, 46, 15, 30,
13, 6, 115, 30, 14, 23, 46, 28, 44, 7, 24, 30, 59, 1, 16, 30,
12, 7, 121, 30, 12, 26, 47, 28, 39, 14, 24, 30, 22, 41, 15, 30,
6, 14, 121, 30, 6, 34, 47, 28, 46, 10, 24, 30, 2, 64, 15, 30,
17, 4, 122, 30, 29, 14, 46, 28, 49, 10, 24, 30, 24, 46, 15, 30,
4, 18, 122, 30, 13, 32, 46, 28, 48, 14, 24, 30, 42, 32, 15, 30,
20, 4, 117, 30, 40, 7, 47, 28, 43, 22, 24, 30, 10, 67, 15, 30,
19, 6, 118, 30, 18, 31, 47, 28, 34, 34, 24, 30, 20, 61, 15, 30
];

// Galois field log table
var glog = [
0xff, 0x00, 0x01, 0x19, 0x02, 0x32, 0x1a, 0xc6, 0x03, 0xdf, 0x33, 0xee, 0x1b, 0x68, 0xc7, 0x4b,
0x04, 0x64, 0xe0, 0x0e, 0x34, 0x8d, 0xef, 0x81, 0x1c, 0xc1, 0x69, 0xf8, 0xc8, 0x08, 0x4c, 0x71,
0x05, 0x8a, 0x65, 0x2f, 0xe1, 0x24, 0x0f, 0x21, 0x35, 0x93, 0x8e, 0xda, 0xf0, 0x12, 0x82, 0x45,
0x1d, 0xb5, 0xc2, 0x7d, 0x6a, 0x27, 0xf9, 0xb9, 0xc9, 0x9a, 0x09, 0x78, 0x4d, 0xe4, 0x72, 0xa6,
0x06, 0xbf, 0x8b, 0x62, 0x66, 0xdd, 0x30, 0xfd, 0xe2, 0x98, 0x25, 0xb3, 0x10, 0x91, 0x22, 0x88,
0x36, 0xd0, 0x94, 0xce, 0x8f, 0x96, 0xdb, 0xbd, 0xf1, 0xd2, 0x13, 0x5c, 0x83, 0x38, 0x46, 0x40,
0x1e, 0x42, 0xb6, 0xa3, 0xc3, 0x48, 0x7e, 0x6e, 0x6b, 0x3a, 0x28, 0x54, 0xfa, 0x85, 0xba, 0x3d,
0xca, 0x5e, 0x9b, 0x9f, 0x0a, 0x15, 0x79, 0x2b, 0x4e, 0xd4, 0xe5, 0xac, 0x73, 0xf3, 0xa7, 0x57,
0x07, 0x70, 0xc0, 0xf7, 0x8c, 0x80, 0x63, 0x0d, 0x67, 0x4a, 0xde, 0xed, 0x31, 0xc5, 0xfe, 0x18,
0xe3, 0xa5, 0x99, 0x77, 0x26, 0xb8, 0xb4, 0x7c, 0x11, 0x44, 0x92, 0xd9, 0x23, 0x20, 0x89, 0x2e,
0x37, 0x3f, 0xd1, 0x5b, 0x95, 0xbc, 0xcf, 0xcd, 0x90, 0x87, 0x97, 0xb2, 0xdc, 0xfc, 0xbe, 0x61,
0xf2, 0x56, 0xd3, 0xab, 0x14, 0x2a, 0x5d, 0x9e, 0x84, 0x3c, 0x39, 0x53, 0x47, 0x6d, 0x41, 0xa2,
0x1f, 0x2d, 0x43, 0xd8, 0xb7, 0x7b, 0xa4, 0x76, 0xc4, 0x17, 0x49, 0xec, 0x7f, 0x0c, 0x6f, 0xf6,
0x6c, 0xa1, 0x3b, 0x52, 0x29, 0x9d, 0x55, 0xaa, 0xfb, 0x60, 0x86, 0xb1, 0xbb, 0xcc, 0x3e, 0x5a,
0xcb, 0x59, 0x5f, 0xb0, 0x9c, 0xa9, 0xa0, 0x51, 0x0b, 0xf5, 0x16, 0xeb, 0x7a, 0x75, 0x2c, 0xd7,
0x4f, 0xae, 0xd5, 0xe9, 0xe6, 0xe7, 0xad, 0xe8, 0x74, 0xd6, 0xf4, 0xea, 0xa8, 0x50, 0x58, 0xaf
];

// Galios field exponent table
var gexp = [
0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1d, 0x3a, 0x74, 0xe8, 0xcd, 0x87, 0x13, 0x26,
0x4c, 0x98, 0x2d, 0x5a, 0xb4, 0x75, 0xea, 0xc9, 0x8f, 0x03, 0x06, 0x0c, 0x18, 0x30, 0x60, 0xc0,
0x9d, 0x27, 0x4e, 0x9c, 0x25, 0x4a, 0x94, 0x35, 0x6a, 0xd4, 0xb5, 0x77, 0xee, 0xc1, 0x9f, 0x23,
0x46, 0x8c, 0x05, 0x0a, 0x14, 0x28, 0x50, 0xa0, 0x5d, 0xba, 0x69, 0xd2, 0xb9, 0x6f, 0xde, 0xa1,
0x5f, 0xbe, 0x61, 0xc2, 0x99, 0x2f, 0x5e, 0xbc, 0x65, 0xca, 0x89, 0x0f, 0x1e, 0x3c, 0x78, 0xf0,
0xfd, 0xe7, 0xd3, 0xbb, 0x6b, 0xd6, 0xb1, 0x7f, 0xfe, 0xe1, 0xdf, 0xa3, 0x5b, 0xb6, 0x71, 0xe2,
0xd9, 0xaf, 0x43, 0x86, 0x11, 0x22, 0x44, 0x88, 0x0d, 0x1a, 0x34, 0x68, 0xd0, 0xbd, 0x67, 0xce,
0x81, 0x1f, 0x3e, 0x7c, 0xf8, 0xed, 0xc7, 0x93, 0x3b, 0x76, 0xec, 0xc5, 0x97, 0x33, 0x66, 0xcc,
0x85, 0x17, 0x2e, 0x5c, 0xb8, 0x6d, 0xda, 0xa9, 0x4f, 0x9e, 0x21, 0x42, 0x84, 0x15, 0x2a, 0x54,
0xa8, 0x4d, 0x9a, 0x29, 0x52, 0xa4, 0x55, 0xaa, 0x49, 0x92, 0x39, 0x72, 0xe4, 0xd5, 0xb7, 0x73,
0xe6, 0xd1, 0xbf, 0x63, 0xc6, 0x91, 0x3f, 0x7e, 0xfc, 0xe5, 0xd7, 0xb3, 0x7b, 0xf6, 0xf1, 0xff,
0xe3, 0xdb, 0xab, 0x4b, 0x96, 0x31, 0x62, 0xc4, 0x95, 0x37, 0x6e, 0xdc, 0xa5, 0x57, 0xae, 0x41,
0x82, 0x19, 0x32, 0x64, 0xc8, 0x8d, 0x07, 0x0e, 0x1c, 0x38, 0x70, 0xe0, 0xdd, 0xa7, 0x53, 0xa6,
0x51, 0xa2, 0x59, 0xb2, 0x79, 0xf2, 0xf9, 0xef, 0xc3, 0x9b, 0x2b, 0x56, 0xac, 0x45, 0x8a, 0x09,
0x12, 0x24, 0x48, 0x90, 0x3d, 0x7a, 0xf4, 0xf5, 0xf7, 0xf3, 0xfb, 0xeb, 0xcb, 0x8b, 0x0b, 0x16,
0x2c, 0x58, 0xb0, 0x7d, 0xfa, 0xe9, 0xcf, 0x83, 0x1b, 0x36, 0x6c, 0xd8, 0xad, 0x47, 0x8e, 0x00
];

// Working buffers:
// data input and ecc append, image working buffer, fixed part of image, run lengths for badness
var strinbuf = [], eccbuf = [], qrframe = [], framask = [], rlens = [];
// Control values - width is based on version, last 4 are from table.
var version, width, neccblk1, neccblk2, datablkw, eccblkwid;
var ecclevel = 2;
// set bit to indicate cell in qrframe is immutable. symmetric around diagonal
function setmask(x, y) {
var bt;
if (x > y) {
bt = x;
x = y;
y = bt;
}
// y*y = 1+3+5...
bt = y;
bt *= y;
bt += y;
bt >>= 1;
bt += x;
framask[bt] = 1;
}

// enter alignment pattern - black to qrframe, white to mask (later black frame merged to mask)
function putalign(x, y) {
var j;

qrframe[x + width * y] = 1;
for (j = -2; j < 2; j++) {
qrframe[(x + j) + width * (y - 2)] = 1;
qrframe[(x - 2) + width * (y + j + 1)] = 1;
qrframe[(x + 2) + width * (y + j)] = 1;
qrframe[(x + j + 1) + width * (y + 2)] = 1;
}
for (j = 0; j < 2; j++) {
setmask(x - 1, y + j);
setmask(x + 1, y - j);
setmask(x - j, y - 1);
setmask(x + j, y + 1);
}
}

//========================================================================
// Reed Solomon error correction
// exponentiation mod N
function modnn(x) {
while (x >= 255) {
x -= 255;
x = (x >> 8) + (x & 255);
}
return x;
}

var genpoly = [];

// Calculate and append ECC data to data block. Block is in strinbuf, indexes to buffers given.
function appendrs(data, dlen, ecbuf, eclen) {
var i, j, fb;

for (i = 0; i < eclen; i++)
strinbuf[ecbuf + i] = 0;
for (i = 0; i < dlen; i++) {
fb = glog[strinbuf[data + i] ^ strinbuf[ecbuf]];
if (fb != 255) /* fb term is non-zero */
for (j = 1; j < eclen; j++)
strinbuf[ecbuf + j - 1] = strinbuf[ecbuf + j] ^ gexp[modnn(fb + genpoly[eclen - j])];
else
for (j = ecbuf; j < ecbuf + eclen; j++)
strinbuf[j] = strinbuf[j + 1];
strinbuf[ecbuf + eclen - 1] = fb == 255 ? 0 : gexp[modnn(fb + genpoly[0])];
}
}

//========================================================================
// Frame data insert following the path rules

// check mask - since symmetrical use half.
function ismasked(x, y) {
var bt;
if (x > y) {
bt = x;
x = y;
y = bt;
}
bt = y;
bt += y * y;
bt >>= 1;
bt += x;
return framask[bt];
}

//========================================================================
// Apply the selected mask out of the 8.
function applymask(m) {
var x, y, r3x, r3y;

switch (m) {
case 0:
for (y = 0; y < width; y++)
for (x = 0; x < width; x++)
if (!((x + y) & 1) && !ismasked(x, y))
qrframe[x + y * width] ^= 1;
break;
case 1:
for (y = 0; y < width; y++)
for (x = 0; x < width; x++)
if (!(y & 1) && !ismasked(x, y))
qrframe[x + y * width] ^= 1;
break;
case 2:
for (y = 0; y < width; y++)
for (r3x = 0, x = 0; x < width; x++ , r3x++) {
if (r3x == 3)
r3x = 0;
if (!r3x && !ismasked(x, y))
qrframe[x + y * width] ^= 1;
}
break;
case 3:
for (r3y = 0, y = 0; y < width; y++ , r3y++) {
if (r3y == 3)
r3y = 0;
for (r3x = r3y, x = 0; x < width; x++ , r3x++) {
if (r3x == 3)
r3x = 0;
if (!r3x && !ismasked(x, y))
qrframe[x + y * width] ^= 1;
}
}
break;
case 4:
for (y = 0; y < width; y++)
for (r3x = 0, r3y = ((y >> 1) & 1), x = 0; x < width; x++ , r3x++) {
if (r3x == 3) {
r3x = 0;
r3y = !r3y;
}
if (!r3y && !ismasked(x, y))
qrframe[x + y * width] ^= 1;
}
break;
case 5:
for (r3y = 0, y = 0; y < width; y++ , r3y++) {
if (r3y == 3)
r3y = 0;
for (r3x = 0, x = 0; x < width; x++ , r3x++) {
if (r3x == 3)
r3x = 0;
if (!((x & y & 1) + !(!r3x | !r3y)) && !ismasked(x, y))
qrframe[x + y * width] ^= 1;
}
}
break;
case 6:
for (r3y = 0, y = 0; y < width; y++ , r3y++) {
if (r3y == 3)
r3y = 0;
for (r3x = 0, x = 0; x < width; x++ , r3x++) {
if (r3x == 3)
r3x = 0;
if (!(((x & y & 1) + (r3x && (r3x == r3y))) & 1) && !ismasked(x, y))
qrframe[x + y * width] ^= 1;
}
}
break;
case 7:
for (r3y = 0, y = 0; y < width; y++ , r3y++) {
if (r3y == 3)
r3y = 0;
for (r3x = 0, x = 0; x < width; x++ , r3x++) {
if (r3x == 3)
r3x = 0;
if (!(((r3x && (r3x == r3y)) + ((x + y) & 1)) & 1) && !ismasked(x, y))
qrframe[x + y * width] ^= 1;
}
}
break;
}
return;
}

// Badness coefficients.
var N1 = 3, N2 = 3, N3 = 40, N4 = 10;

// Using the table of the length of each run, calculate the amount of bad image
// - long runs or those that look like finders; called twice, once each for X and Y
function badruns(length) {
var i;
var runsbad = 0;
for (i = 0; i <= length; i++)
if (rlens[i] >= 5)
runsbad += N1 + rlens[i] - 5;
// BwBBBwB as in finder
for (i = 3; i < length - 1; i += 2)
if (rlens[i - 2] == rlens[i + 2]
&& rlens[i + 2] == rlens[i - 1]
&& rlens[i - 1] == rlens[i + 1]
&& rlens[i - 1] * 3 == rlens[i]
// white around the black pattern? Not part of spec
&& (rlens[i - 3] == 0 // beginning
|| i + 3 > length // end
|| rlens[i - 3] * 3 >= rlens[i] * 4 || rlens[i + 3] * 3 >= rlens[i] * 4)
)
runsbad += N3;
return runsbad;
}

// Calculate how bad the masked image is - blocks, imbalance, runs, or finders.
function badcheck() {
var x, y, h, b, b1;
var thisbad = 0;
var bw = 0;

// blocks of same color.
for (y = 0; y < width - 1; y++)
for (x = 0; x < width - 1; x++)
if ((qrframe[x + width * y] && qrframe[(x + 1) + width * y]
&& qrframe[x + width * (y + 1)] && qrframe[(x + 1) + width * (y + 1)]) // all black
|| !(qrframe[x + width * y] || qrframe[(x + 1) + width * y]
|| qrframe[x + width * (y + 1)] || qrframe[(x + 1) + width * (y + 1)])) // all white
thisbad += N2;

// X runs
for (y = 0; y < width; y++) {
rlens[0] = 0;
for (h = b = x = 0; x < width; x++) {
if ((b1 = qrframe[x + width * y]) == b)
rlens[h]++;
else
rlens[++h] = 1;
b = b1;
bw += b ? 1 : -1;
}
thisbad += badruns(h);
}

// black/white imbalance
if (bw < 0)
bw = -bw;

var big = bw;
var count = 0;
big += big << 2;
big <<= 1;
while (big > width * width)
big -= width * width, count++;
thisbad += count * N4;

// Y runs
for (x = 0; x < width; x++) {
rlens[0] = 0;
for (h = b = y = 0; y < width; y++) {
if ((b1 = qrframe[x + width * y]) == b)
rlens[h]++;
else
rlens[++h] = 1;
b = b1;
}
thisbad += badruns(h);
}
return thisbad;
}

function genframe(instring) {
var x, y, k, t, v, i, j, m;

// find the smallest version that fits the string
t = instring.length;
version = 0;
do {
version++;
k = (ecclevel - 1) * 4 + (version - 1) * 16;
neccblk1 = eccblocks[k++];
neccblk2 = eccblocks[k++];
datablkw = eccblocks[k++];
eccblkwid = eccblocks[k];
k = datablkw * (neccblk1 + neccblk2) + neccblk2 - 3 + (version <= 9);
if (t <= k)
break;
} while (version < 40);

// FIXME - insure that it fits insted of being truncated
width = 17 + 4 * version;

// allocate, clear and setup data structures
v = datablkw + (datablkw + eccblkwid) * (neccblk1 + neccblk2) + neccblk2;
for (t = 0; t < v; t++)
eccbuf[t] = 0;
strinbuf = instring.slice(0);

for (t = 0; t < width * width; t++)
qrframe[t] = 0;

for (t = 0; t < (width * (width + 1) + 1) / 2; t++)
framask[t] = 0;

// insert finders - black to frame, white to mask
for (t = 0; t < 3; t++) {
k = 0;
y = 0;
if (t == 1)
k = (width - 7);
if (t == 2)
y = (width - 7);
qrframe[(y + 3) + width * (k + 3)] = 1;
for (x = 0; x < 6; x++) {
qrframe[(y + x) + width * k] = 1;
qrframe[y + width * (k + x + 1)] = 1;
qrframe[(y + 6) + width * (k + x)] = 1;
qrframe[(y + x + 1) + width * (k + 6)] = 1;
}
for (x = 1; x < 5; x++) {
setmask(y + x, k + 1);
setmask(y + 1, k + x + 1);
setmask(y + 5, k + x);
setmask(y + x + 1, k + 5);
}
for (x = 2; x < 4; x++) {
qrframe[(y + x) + width * (k + 2)] = 1;
qrframe[(y + 2) + width * (k + x + 1)] = 1;
qrframe[(y + 4) + width * (k + x)] = 1;
qrframe[(y + x + 1) + width * (k + 4)] = 1;
}
}

// alignment blocks
if (version > 1) {
t = adelta[version];
y = width - 7;
for (; 😉 {
x = width - 7;
while (x > t - 3) {
putalign(x, y);
if (x < t)
break;
x -= t;
}
if (y <= t + 9)
break;
y -= t;
putalign(6, y);
putalign(y, 6);
}
}

// single black
qrframe[8 + width * (width - 8)] = 1;

// timing gap - mask only
for (y = 0; y < 7; y++) {
setmask(7, y);
setmask(width - 8, y);
setmask(7, y + width - 7);
}
for (x = 0; x < 8; x++) {
setmask(x, 7);
setmask(x + width - 8, 7);
setmask(x, width - 8);
}

// reserve mask-format area
for (x = 0; x < 9; x++)
setmask(x, 8);
for (x = 0; x < 8; x++) {
setmask(x + width - 8, 8);
setmask(8, x);
}
for (y = 0; y < 7; y++)
setmask(8, y + width - 7);

// timing row/col
for (x = 0; x < width - 14; x++)
if (x & 1) {
setmask(8 + x, 6);
setmask(6, 8 + x);
}
else {
qrframe[(8 + x) + width * 6] = 1;
qrframe[6 + width * (8 + x)] = 1;
}

// version block
if (version > 6) {
t = vpat[version - 7];
k = 17;
for (x = 0; x < 6; x++)
for (y = 0; y < 3; y++ , k--)
if (1 & (k > 11 ? version >> (k - 12) : t >> k)) {
qrframe[(5 - x) + width * (2 - y + width - 11)] = 1;
qrframe[(2 - y + width - 11) + width * (5 - x)] = 1;
}
else {
setmask(5 - x, 2 - y + width - 11);
setmask(2 - y + width - 11, 5 - x);
}
}

// sync mask bits - only set above for white spaces, so add in black bits
for (y = 0; y < width; y++)
for (x = 0; x <= y; x++)
if (qrframe[x + width * y])
setmask(x, y);

// convert string to bitstream
// 8 bit data to QR-coded 8 bit data (numeric or alphanum, or kanji not supported)
v = strinbuf.length;

// string to array
for (i = 0; i < v; i++)
eccbuf[i] = strinbuf.charCodeAt(i);
strinbuf = eccbuf.slice(0);

// calculate max string length
x = datablkw * (neccblk1 + neccblk2) + neccblk2;
if (v >= x - 2) {
v = x - 2;
if (version > 9)
v--;
}

// shift and repack to insert length prefix
i = v;
if (version > 9) {
strinbuf[i + 2] = 0;
strinbuf[i + 3] = 0;
while (i--) {
t = strinbuf[i];
strinbuf[i + 3] |= 255 & (t << 4);
strinbuf[i + 2] = t >> 4;
}
strinbuf[2] |= 255 & (v << 4);
strinbuf[1] = v >> 4;
strinbuf[0] = 0x40 | (v >> 12);
}
else {
strinbuf[i + 1] = 0;
strinbuf[i + 2] = 0;
while (i--) {
t = strinbuf[i];
strinbuf[i + 2] |= 255 & (t << 4);
strinbuf[i + 1] = t >> 4;
}
strinbuf[1] |= 255 & (v << 4);
strinbuf[0] = 0x40 | (v >> 4);
}
// fill to end with pad pattern
i = v + 3 - (version < 10);
while (i < x) {
strinbuf[i++] = 0xec;
// buffer has room if (i == x) break;
strinbuf[i++] = 0x11;
}

// calculate and append ECC

// calculate generator polynomial
genpoly[0] = 1;
for (i = 0; i < eccblkwid; i++) {
genpoly[i + 1] = 1;
for (j = i; j > 0; j--)
genpoly[j] = genpoly[j]
? genpoly[j - 1] ^ gexp[modnn(glog[genpoly[j]] + i)] : genpoly[j - 1];
genpoly[0] = gexp[modnn(glog[genpoly[0]] + i)];
}
for (i = 0; i <= eccblkwid; i++)
genpoly[i] = glog[genpoly[i]]; // use logs for genpoly[] to save calc step

// append ecc to data buffer
k = x;
y = 0;
for (i = 0; i < neccblk1; i++) {
appendrs(y, datablkw, k, eccblkwid);
y += datablkw;
k += eccblkwid;
}
for (i = 0; i < neccblk2; i++) {
appendrs(y, datablkw + 1, k, eccblkwid);
y += datablkw + 1;
k += eccblkwid;
}
// interleave blocks
y = 0;
for (i = 0; i < datablkw; i++) {
for (j = 0; j < neccblk1; j++)
eccbuf[y++] = strinbuf[i + j * datablkw];
for (j = 0; j < neccblk2; j++)
eccbuf[y++] = strinbuf[(neccblk1 * datablkw) + i + (j * (datablkw + 1))];
}
for (j = 0; j < neccblk2; j++)
eccbuf[y++] = strinbuf[(neccblk1 * datablkw) + i + (j * (datablkw + 1))];
for (i = 0; i < eccblkwid; i++)
for (j = 0; j < neccblk1 + neccblk2; j++)
eccbuf[y++] = strinbuf[x + i + j * eccblkwid];
strinbuf = eccbuf;

// pack bits into frame avoiding masked area.
x = y = width - 1;
k = v = 1; // up, minus
/* inteleaved data and ecc codes */
m = (datablkw + eccblkwid) * (neccblk1 + neccblk2) + neccblk2;
for (i = 0; i < m; i++) {
t = strinbuf[i];
for (j = 0; j < 8; j++ , t <<= 1) {
if (0x80 & t)
qrframe[x + width * y] = 1;
do { // find next fill position
if (v)
x--;
else {
x++;
if (k) {
if (y != 0)
y--;
else {
x -= 2;
k = !k;
if (x == 6) {
x--;
y = 9;
}
}
}
else {
if (y != width - 1)
y++;
else {
x -= 2;
k = !k;
if (x == 6) {
x--;
y -= 8;
}
}
}
}
v = !v;
} while (ismasked(x, y));
}
}

// save pre-mask copy of frame
strinbuf = qrframe.slice(0);
t = 0; // best
y = 30000; // demerit
// for instead of while since in original arduino code
// if an early mask was "good enough" it wouldn't try for a better one
// since they get more complex and take longer.
for (k = 0; k < 8; k++) {
applymask(k); // returns black-white imbalance
x = badcheck();
if (x < y) { // current mask better than previous best?
y = x;
t = k;
}
if (t == 7)
break; // don't increment i to a void redoing mask
qrframe = strinbuf.slice(0); // reset for next pass
}
if (t != k) // redo best mask - none good enough, last wasn't t
applymask(t);

// add in final mask/ecclevel bytes
y = fmtword[t + ((ecclevel - 1) << 3)];
// low byte
for (k = 0; k < 8; k++ , y >>= 1)
if (y & 1) {
qrframe[(width - 1 - k) + width * 8] = 1;
if (k < 6)
qrframe[8 + width * k] = 1;
else
qrframe[8 + width * (k + 1)] = 1;
}
// high byte
for (k = 0; k < 7; k++ , y >>= 1)
if (y & 1) {
qrframe[8 + width * (width - 7 + k)] = 1;
if (k)
qrframe[(6 - k) + width * 8] = 1;
else
qrframe[7 + width * 8] = 1;
}
return qrframe;
}

var _canvas = null;

var api = {

get ecclevel() {
return ecclevel;
},

set ecclevel(val) {
ecclevel = val;
},

get size() {
return _size;
},

set size(val) {
_size = val
},

get canvas() {
return _canvas;
},

set canvas(el) {
_canvas = el;
},

getFrame: function (string) {
return genframe(string);
},
//这里的utf16to8(str)是对Text中的字符串进行转码，让其支持中文
utf16to8: function (str) {
var out, i, len, c;

out = "";
len = str.length;
for (i = 0; i < len; i++) {
c = str.charCodeAt(i);
if ((c >= 0x0001) && (c <= 0x007F)) {
out += str.charAt(i);
} else if (c > 0x07FF) {
out += String.fromCharCode(0xE0 | ((c >> 12) & 0x0F));
out += String.fromCharCode(0x80 | ((c >> 6) & 0x3F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
} else {
out += String.fromCharCode(0xC0 | ((c >> 6) & 0x1F));
out += String.fromCharCode(0x80 | ((c >> 0) & 0x3F));
}
}
return out;
},
/**
* 新增$this参数，传入组件的this,兼容在组件中生成
* @param bg 目前只能设置颜色值
*/
draw: function (str, ctx, startX, startY, cavW, cavH, bg, color, $this, ecc) {
var that = this;
ecclevel = ecc || ecclevel;
if (!ctx) {
console.warn('No canvas provided to draw QR code in!')
return;
}
var size = Math.min(cavW, cavH);
str = that.utf16to8(str);//增加中文显示

var frame = that.getFrame(str);
var px = size / width;
if (bg) {
ctx.fillStyle = bg;
ctx.fillRect(startX, startY, cavW, cavW);
}
ctx.fillStyle = color || 'black';
for (var i = 0; i < width; i++) {
for (var j = 0; j < width; j++) {
if (frame[j * width + i]) {
ctx.fillRect(startX + px * i, startY + px * j, px, px);
}
}
}
}
}
module.exports = { api }
// exports.draw = api;

})();
components/painter/lib/sha1.js

var hexcase = 0;
var chrsz = 8;

function hex_sha1(s) {
return binb2hex(core_sha1(str2binb(s), s.length * chrsz));
}

function core_sha1(x, len) {
x[len >> 5] |= 0x80 << (24 - (len % 32));
x[(((len + 64) >> 9) << 4) + 15] = len;

var w = Array(80);
var a = 1732584193;
var b = -271733879;
var c = -1732584194;
var d = 271733878;
var e = -1009589776;

for (var i = 0; i < x.length; i += 16) {
var olda = a;
var oldb = b;
var oldc = c;
var oldd = d;
var olde = e;

for (var j = 0; j < 80; j++) {
if (j < 16) w[j] = x[i + j];
else w[j] = rol(w[j - 3] ^ w[j - 8] ^ w[j - 14] ^ w[j - 16], 1);
var t = safe_add(
safe_add(rol(a, 5), sha1_ft(j, b, c, d)),
safe_add(safe_add(e, w[j]), sha1_kt(j))
);
e = d;
d = c;
c = rol(b, 30);
b = a;
a = t;
}

a = safe_add(a, olda);
b = safe_add(b, oldb);
c = safe_add(c, oldc);
d = safe_add(d, oldd);
e = safe_add(e, olde);
}
return Array(a, b, c, d, e);
}

function sha1_ft(t, b, c, d) {
if (t < 20) return (b & c) | (~b & d);
if (t < 40) return b ^ c ^ d;
if (t < 60) return (b & c) | (b & d) | (c & d);
return b ^ c ^ d;
}

function sha1_kt(t) {
return t < 20
? 1518500249
: t < 40
? 1859775393
: t < 60
? -1894007588
: -899497514;
}

function safe_add(x, y) {
var lsw = (x & 0xffff) + (y & 0xffff);
var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xffff);
}

function rol(num, cnt) {
return (num << cnt) | (num >>> (32 - cnt));
}

function str2binb(str) {
var bin = Array();
var mask = (1 << chrsz) - 1;
for (var i = 0; i < str.length * chrsz; i += chrsz)
bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (24 - (i % 32));
return bin;
}

function binb2hex(binarray) {
var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
var str = "";
for (var i = 0; i < binarray.length * 4; i++) {
str +=
hex_tab.charAt((binarray[i >> 2] >> ((3 - (i % 4)) * 8 + 4)) & 0xf) +
hex_tab.charAt((binarray[i >> 2] >> ((3 - (i % 4)) * 8)) & 0xf);
}
return str;
}

module.exports = {
hex_sha1,
}
components/painter/lib/string-polyfill.js

String.prototype.substr = function (start, length) {
if (start === undefined) {
return this.toString()
}
if (typeof start !== 'number' || (typeof length !== 'number' && length !== undefined) ) {
return ''
}
const strArr = [...this]
const _length = strArr.length
if (_length + start < 0) {
start = 0
}
if (length === undefined || (start < 0 && start + length > 0)) {
return strArr.slice(start).join('')
} else {
return strArr.slice(start, start + length).join('')
}
}

String.prototype.substring = function (start, end) {
if (start === undefined) {
return this.toString()
}
if (typeof start !== 'number' || (typeof end !== 'number' && end !== undefined) ) {
return ''
}
if (!(start > 0)) {
start = 0
}
if (!(end > 0) && end !== undefined) {
end = 0
}
const strArr = [...this]
const _length = strArr.length
if (start > _length) {
start = _length
}
if (end > _length) {
end = _length
}
if (end < start) {
[start, end] = [end, start]
}
return strArr.slice(start, end).join('')
}
components/painter/lib/util.js

function isValidUrl(url) {
return isOnlineUrl(url) || isDataUrl(url);
}

function isOnlineUrl(url) {
return /((ht|f)tp(s?)|cloud)😕/([^ \/].)+[^ \/](:[0-9]+)?/?/.test(url)
}

function isDataUrl(url) {
return /data:image/(\w+);base64,(.*)/.test(url);
}

/**
* 深度对比两个对象是否一致
* from: https://github.com/epoberezkin/fast-deep-equal
* @param {Object} a 对象a
* @param {Object} b 对象b
* @return {Boolean} 是否相同
/
/ eslint-disable */
function equal(a, b) {
if (a === b) return true;

if (a && b && typeof a == 'object' && typeof b == 'object') {
var arrA = Array.isArray(a)
, arrB = Array.isArray(b)
, i
, length
, key;

if (arrA && arrB) {
length = a.length;
if (length != b.length) return false;
for (i = length; i-- !== 0;)
if (!equal(a[i], b[i])) return false;
return true;
}

if (arrA != arrB) return false;

var dateA = a instanceof Date
, dateB = b instanceof Date;
if (dateA != dateB) return false;
if (dateA && dateB) return a.getTime() == b.getTime();

var regexpA = a instanceof RegExp
, regexpB = b instanceof RegExp;
if (regexpA != regexpB) return false;
if (regexpA && regexpB) return a.toString() == b.toString();

var keys = Object.keys(a);
length = keys.length;

if (length !== Object.keys(b).length)
return false;

for (i = length; i-- !== 0;)
if (!Object.prototype.hasOwnProperty.call(b, keys[i])) return false;

for (i = length; i-- !== 0;) {
key = keys[i];
if (!equal(a[key], b[key])) return false;
}

return true;
}

return a!a && b!b;
}

module.exports = {
isValidUrl,
isOnlineUrl,
isDataUrl,
equal
};
components/painter/lib/wx-canvas.js

// @ts-check
export default class WxCanvas {
ctx;
type;
canvasId;
canvasNode;
stepList = [];
canvasPrototype = {};

constructor(type, ctx, canvasId, isNew, canvasNode) {
this.ctx = ctx;
this.canvasId = canvasId;
this.type = type;
if (isNew) {
this.canvasNode = canvasNode || {};
}
}

set width(w) {
if (this.canvasNode) {
this.canvasNode.width = w;
// 经测试，在 2d 接口中如果不设置这个值，IOS 端有一定几率会出现图片显示不全的情况。
this.canvasNode._width = w;
}
}

get width() {
if (this.canvasNode) return this.canvasNode.width;
return 0;
}

set height(h) {
if (this.canvasNode) {
this.canvasNode.height = h;
// 经测试，在 2d 接口中如果不设置这个值，IOS 端有一定几率会出现图片显示不全的情况。
this.canvasNode._height = h;
}
}

get height() {
if (this.canvasNode) return this.canvasNode.height;
return 0;
}

set lineWidth(args) {
this.canvasPrototype.lineWidth = args;
this.stepList.push({
action: "lineWidth",
args,
actionType: "set",
});
}

get lineWidth() {
return this.canvasPrototype.lineWidth;
}

set lineCap(args) {
this.canvasPrototype.lineCap = args;
this.stepList.push({
action: "lineCap",
args,
actionType: "set",
});
}

get lineCap() {
return this.canvasPrototype.lineCap;
}

set lineJoin(args) {
this.canvasPrototype.lineJoin = args;
this.stepList.push({
action: "lineJoin",
args,
actionType: "set",
});
}

get lineJoin() {
return this.canvasPrototype.lineJoin;
}

set miterLimit(args) {
this.canvasPrototype.miterLimit = args;
this.stepList.push({
action: "miterLimit",
args,
actionType: "set",
});
}

get miterLimit() {
return this.canvasPrototype.miterLimit;
}

set lineDashOffset(args) {
this.canvasPrototype.lineDashOffset = args;
this.stepList.push({
action: "lineDashOffset",
args,
actionType: "set",
});
}

get lineDashOffset() {
return this.canvasPrototype.lineDashOffset;
}

set font(args) {
this.canvasPrototype.font = args;
this.ctx.font = args;
this.stepList.push({
action: "font",
args,
actionType: "set",
});
}

get font() {
return this.canvasPrototype.font;
}

set textAlign(args) {
this.canvasPrototype.textAlign = args;
this.stepList.push({
action: "textAlign",
args,
actionType: "set",
});
}

get textAlign() {
return this.canvasPrototype.textAlign;
}

set textBaseline(args) {
this.canvasPrototype.textBaseline = args;
this.stepList.push({
action: "textBaseline",
args,
actionType: "set",
});
}

get textBaseline() {
return this.canvasPrototype.textBaseline;
}

set fillStyle(args) {
this.canvasPrototype.fillStyle = args;
this.stepList.push({
action: "fillStyle",
args,
actionType: "set",
});
}

get fillStyle() {
return this.canvasPrototype.fillStyle;
}

set strokeStyle(args) {
this.canvasPrototype.strokeStyle = args;
this.stepList.push({
action: "strokeStyle",
args,
actionType: "set",
});
}

get strokeStyle() {
return this.canvasPrototype.strokeStyle;
}

set globalAlpha(args) {
this.canvasPrototype.globalAlpha = args;
this.stepList.push({
action: "globalAlpha",
args,
actionType: "set",
});
}

get globalAlpha() {
return this.canvasPrototype.globalAlpha;
}

set globalCompositeOperation(args) {
this.canvasPrototype.globalCompositeOperation = args;
this.stepList.push({
action: "globalCompositeOperation",
args,
actionType: "set",
});
}

get globalCompositeOperation() {
return this.canvasPrototype.globalCompositeOperation;
}

set shadowColor(args) {
this.canvasPrototype.shadowColor = args;
this.stepList.push({
action: "shadowColor",
args,
actionType: "set",
});
}

get shadowColor() {
return this.canvasPrototype.shadowColor;
}

set shadowOffsetX(args) {
this.canvasPrototype.shadowOffsetX = args;
this.stepList.push({
action: "shadowOffsetX",
args,
actionType: "set",
});
}

get shadowOffsetX() {
return this.canvasPrototype.shadowOffsetX;
}

set shadowOffsetY(args) {
this.canvasPrototype.shadowOffsetY = args;
this.stepList.push({
action: "shadowOffsetY",
args,
actionType: "set",
});
}

get shadowOffsetY() {
return this.canvasPrototype.shadowOffsetY;
}

set shadowBlur(args) {
this.canvasPrototype.shadowBlur = args;
this.stepList.push({
action: "shadowBlur",
args,
actionType: "set",
});
}

get shadowBlur() {
return this.canvasPrototype.shadowBlur;
}

save() {
this.stepList.push({
action: "save",
args: null,
actionType: "func",
});
}

restore() {
this.stepList.push({
action: "restore",
args: null,
actionType: "func",
});
}

setLineDash(...args) {
this.canvasPrototype.lineDash = args;
this.stepList.push({
action: "setLineDash",
args,
actionType: "func",
});
}

moveTo(...args) {
this.stepList.push({
action: "moveTo",
args,
actionType: "func",
});
}

closePath() {
this.stepList.push({
action: "closePath",
args: null,
actionType: "func",
});
}

lineTo(...args) {
this.stepList.push({
action: "lineTo",
args,
actionType: "func",
});
}

quadraticCurveTo(...args) {
this.stepList.push({
action: "quadraticCurveTo",
args,
actionType: "func",
});
}

bezierCurveTo(...args) {
this.stepList.push({
action: "bezierCurveTo",
args,
actionType: "func",
});
}

arcTo(...args) {
this.stepList.push({
action: "arcTo",
args,
actionType: "func",
});
}

arc(...args) {
this.stepList.push({
action: "arc",
args,
actionType: "func",
});
}

rect(...args) {
this.stepList.push({
action: "rect",
args,
actionType: "func",
});
}

scale(...args) {
this.stepList.push({
action: "scale",
args,
actionType: "func",
});
}

rotate(...args) {
this.stepList.push({
action: "rotate",
args,
actionType: "func",
});
}

translate(...args) {
this.stepList.push({
action: "translate",
args,
actionType: "func",
});
}

transform(...args) {
this.stepList.push({
action: "transform",
args,
actionType: "func",
});
}

setTransform(...args) {
this.stepList.push({
action: "setTransform",
args,
actionType: "func",
});
}

clearRect(...args) {
this.stepList.push({
action: "clearRect",
args,
actionType: "func",
});
}

fillRect(...args) {
this.stepList.push({
action: "fillRect",
args,
actionType: "func",
});
}

strokeRect(...args) {
this.stepList.push({
action: "strokeRect",
args,
actionType: "func",
});
}

fillText(...args) {
this.stepList.push({
action: "fillText",
args,
actionType: "func",
});
}

strokeText(...args) {
this.stepList.push({
action: "strokeText",
args,
actionType: "func",
});
}

beginPath() {
this.stepList.push({
action: "beginPath",
args: null,
actionType: "func",
});
}

fill() {
this.stepList.push({
action: "fill",
args: null,
actionType: "func",
});
}

stroke() {
this.stepList.push({
action: "stroke",
args: null,
actionType: "func",
});
}

drawFocusIfNeeded(...args) {
this.stepList.push({
action: "drawFocusIfNeeded",
args,
actionType: "func",
});
}

clip() {
this.stepList.push({
action: "clip",
args: null,
actionType: "func",
});
}

isPointInPath(...args) {
this.stepList.push({
action: "isPointInPath",
args,
actionType: "func",
});
}

drawImage(...args) {
this.stepList.push({
action: "drawImage",
args,
actionType: "func",
});
}

addHitRegion(...args) {
this.stepList.push({
action: "addHitRegion",
args,
actionType: "func",
});
}

removeHitRegion(...args) {
this.stepList.push({
action: "removeHitRegion",
args,
actionType: "func",
});
}

clearHitRegions(...args) {
this.stepList.push({
action: "clearHitRegions",
args,
actionType: "func",
});
}

putImageData(...args) {
this.stepList.push({
action: "putImageData",
args,
actionType: "func",
});
}

getLineDash() {
return this.canvasPrototype.lineDash;
}

createLinearGradient(...args) {
return this.ctx.createLinearGradient(...args);
}

createRadialGradient(...args) {
if (this.type === "2d") {
return this.ctx.createRadialGradient(...args);
} else {
return this.ctx.createCircularGradient(...args.slice(3, 6));
}
}

createPattern(...args) {
return this.ctx.createPattern(...args);
}

measureText(...args) {
return this.ctx.measureText(...args);
}

createImageData(...args) {
return this.ctx.createImageData(...args);
}

getImageData(...args) {
return this.ctx.getImageData(...args);
}

async draw(reserve, func) {
const realstepList = this.stepList.slice();
this.stepList.length = 0;
if (this.type === "mina") {
if (realstepList.length > 0) {
for (const step of realstepList) {
this.implementMinaStep(step);
}
realstepList.length = 0;
}
this.ctx.draw(reserve, func);
} else if (this.type === "2d") {
if (!reserve) {
this.ctx.clearRect(0, 0, this.canvasNode.width, this.canvasNode.height);
}
if (realstepList.length > 0) {
for (const step of realstepList) {
await this.implement2DStep(step);
}
realstepList.length = 0;
}
if (func) {
func();
}
}
realstepList.length = 0;
}

implementMinaStep(step) {
switch (step.action) {
case "textAlign": {
this.ctx.setTextAlign(step.args);
break;
}
case "textBaseline": {
this.ctx.setTextBaseline(step.args);
break;
}
default: {
if (step.actionType === "set") {
this.ctx[step.action] = step.args;
} else if (step.actionType === "func") {
if (step.args) {
this.ctxstep.action;
} else {
this.ctxstep.action;
}
}
break;
}
}
}

implement2DStep(step) {
return new Promise((resolve) => {
if (step.action === "drawImage") {
const img = this.canvasNode.createImage();
img.src = step.args[0];
img.onload = () => {
this.ctx.drawImage(img, ...step.args.slice(1));
resolve();
};
} else {
if (step.actionType === "set") {
this.ctx[step.action] = step.args;
} else if (step.actionType === "func") {
if (step.args) {
this.ctxstep.action;
} else {
this.ctxstep.action;
}
}
resolve();
}
});
}
}

posted @ 2024-11-25 11:02 不完美的完美阅读(554) 评论(0) 收藏举报

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