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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<canvas id="myCanvas" width="1200" height="800" style="border: solid 1px;"></canvas>
<script type="text/javascript" src="js/arrow.js"></script>
<script type="text/javascript" src="js/step.js" ></script>
<script type="text/javascript" src="js/flow.js"></script>
</body>
</html>
//
// arrow.js
// <箭头对象>
//
// Created by DurantSimpson on 2016-12-08.
// Copyright 2016 DurantSimpson. All rights reserved.
//
/**
*
* @param {Object} x1起始点横坐标
* @param {Object} y1起始点纵坐标
* @param {Object} x2结束点横坐标
* @param {Object} y2结束点纵坐标
*/
function Arrow(x1, y1, x2, y2) {
this.x1 = x1;
this.y1 = y1;
this.x2 = x2;
this.y2 = y2;
this.tmpX1 = null;
this.tmpY1 = null;
this.tmpX2 = null;
this.tmpY2 = null;
this.color = "black";
}
Arrow.prototype.setColor = function(color) {
this.color=color;
}
/**
*
* @param {Object} x1起始点横坐标
* @param {Object} y1起始点纵坐标
* @param {Object} x2结束点横坐标
* @param {Object} y2结束点纵坐标
*/
Arrow.prototype.setP = function(x1, y1, x2, y2) {
this.x1 = x1;
this.y1 = y1;
this.x2 = x2;
this.y2 = y2;
}
/**
* 第一个拐点
*/
Arrow.prototype.setP1 = function(tmpX1,tmpY1) {
this.tmpX1=tmpX1;
this.tmpY1=tmpY1;
}
/**
* 第二个拐点
*/
Arrow.prototype.setP2 = function(tmpX2,tmpY2) {
this.tmpX2=tmpX2;
this.tmpY2=tmpY2;
}
Arrow.prototype.drawBottomToTop = function(ctx) {
if (this.x1 != this.x2) {
this.setP1(this.x1,(this.y1+this.y2)/2);
this.setP2(this.x2,(this.y1+this.y2)/2);
this.draw(ctx);
}else{
this.draw(ctx);
}
}
Arrow.prototype.drawLeftOrRightToTop = function(ctx) {
this.setP1(this.x2,this.y1);
this.draw(ctx);
}
Arrow.prototype.drawLeftToRightOrRightToLeft = function(ctx) {
if (this.y1 != this.y2) {
this.setP1((this.x1+this.x2)/2,this.y1);
this.setP2((this.x1+this.x2)/2,this.y2);
this.draw(ctx);
}else{
this.draw(ctx);
}
}
Arrow.prototype.draw = function(ctx) {
// arbitrary styling
ctx.strokeStyle = this.color;
ctx.fillStyle = this.color;
// draw the line
ctx.beginPath();
ctx.moveTo(this.x1, this.y1);
if(this.tmpX1 != null && this.tmpY1 != null && this.tmpX2 != null && this.tmpY2 != null) {
ctx.lineTo(this.tmpX1, this.tmpY1);
ctx.closePath();
ctx.stroke();
ctx.beginPath();
ctx.moveTo(this.tmpX1, this.tmpY1)
ctx.lineTo(this.tmpX2, this.tmpY2);
ctx.closePath();
ctx.stroke();
ctx.beginPath();
ctx.moveTo(this.tmpX2, this.tmpY2);
ctx.lineTo(this.x2, this.y2);
ctx.closePath();
ctx.stroke();
var endRadians = Math.atan((this.y2 - this.tmpY2) / (this.x2 - this.tmpX2));
endRadians += ((this.x2 >= this.tmpX2) ? 90 : -90) * Math.PI / 180;
this.drawArrowhead(ctx, this.x2, this.y2, endRadians);
} else if(this.tmpX1 != null && this.tmpY1 != null && this.tmpX2 == null && this.tmpY2 == null) {
ctx.lineTo(this.tmpX1, this.tmpY1);
ctx.closePath();
ctx.stroke();
ctx.beginPath();
ctx.moveTo(this.tmpX1, this.tmpY1)
ctx.lineTo(this.x2, this.y2);
ctx.closePath();
ctx.stroke();
var endRadians = Math.atan((this.y2 - this.tmpY1) / (this.x2 - this.tmpX1));
endRadians += ((this.x2 >= this.tmpX1) ? 90 : -90) * Math.PI / 180;
this.drawArrowhead(ctx, this.x2, this.y2, endRadians);
}else if(this.tmpX1 == null && this.tmpY1 == null && this.tmpX2 == null && this.tmpY2 == null){
ctx.lineTo(this.x2, this.y2);
ctx.closePath();
ctx.stroke();
var endRadians = Math.atan((this.y2 - this.y1) / (this.x2 - this.x1));
endRadians += ((this.x2 >= this.x1) ? 90 : -90) * Math.PI / 180;
this.drawArrowhead(ctx, this.x2, this.y2, endRadians);
}
}
/**
* 画箭头
*/
Arrow.prototype.drawArrowhead = function(ctx, x, y, radians) {
ctx.save();
ctx.beginPath();
ctx.translate(x, y);
ctx.rotate(radians);
ctx.moveTo(0, 0);
ctx.lineTo(5, 10);
ctx.lineTo(-5, 10);
ctx.closePath();
ctx.restore();
ctx.fill();
}
//
// step.js
// <流程图对象>
//
// Created by DurantSimpson on 2016-12-08.
// Copyright 2016 DurantSimpson. All rights reserved.
//
function drawRoundRect(x, y, w, h) {
var r = h / 2;
cxt.beginPath();
cxt.moveTo(x + r, y);
cxt.arcTo(x + w, y, x + w, y + h, r);
cxt.arcTo(x + w, y + h, x, y + h, r);
cxt.arcTo(x, y + h, x, y, r);
cxt.arcTo(x, y, x + w, y, r);
cxt.closePath();
cxt.stroke();
}
function drawRhombus(x, y, l) {
cxt.beginPath();
cxt.moveTo(x, y + l);
cxt.lineTo(x - l * 2, y);
cxt.lineTo(x, y - l);
cxt.lineTo(x + l * 2, y);
cxt.closePath();
cxt.stroke();
}
/**
* 圆角矩形开始对象
* @param {Object} x
* @param {Object} y
*/
function Start(x, y) {
this.h = 50;
this.w = 2 * this.h;
this.x = x;
this.y = y;
drawRoundRect(x - this.w / 2, y - this.h / 2, this.w, this.h);
}
/**
* 矩形步骤对象
* @param {Object} x
* @param {Object} y
*/
function Step(x, y) {
this.flag = "step";
this.h = 50;
this.w = 2 * this.h;
this.x = x;
this.y = y;
cxt.strokeRect(x - this.w / 2, y - this.h / 2, this.w, this.h);
}
/**
* 菱形条件对象
* @param {Object} x
* @param {Object} y
*/
function Condition(x, y) {
this.flag = "condition";
this.l = 30;
this.x = x;
this.y = y;
drawRhombus(x, y, this.l);
}
Start.prototype.drawBottomToTop = function(obj) {
if(obj.flag == "step") {
var arrow = new Arrow(this.x, this.y + this.h / 2, obj.x, obj.y - obj.h / 2);
arrow.drawBottomToTop(cxt);
} else if(obj.flag == "condition") {
var arrow = new Arrow(this.x, this.y + this.h / 2, obj.x, obj.y - obj.l);
arrow.drawBottomToTop(cxt);
}
}
Step.prototype.drawBottomToTop = function(obj) {
if(obj.flag == "step") {
var arrow = new Arrow(this.x, this.y + this.h / 2, obj.x, obj.y - obj.h / 2);
arrow.drawBottomToTop(cxt);
} else if(obj.flag == "condition") {
var arrow = new Arrow(this.x, this.y + this.h / 2, obj.x, obj.y - obj.l);
arrow.drawBottomToTop(cxt);
}
}
Condition.prototype.drawBottomToTop = function(obj) {
if(obj.flag == "step") {
var arrow = new Arrow(this.x, this.y + this.l, obj.x, obj.y - obj.h / 2);
arrow.drawBottomToTop(cxt);
} else if(obj.flag == "condition") {
var arrow = new Arrow(this.x, this.y + this.l, obj.x, obj.y - obj.l);
arrow.drawBottomToTop(cxt);
}
}
Condition.prototype.drawRightToTop = function(obj) {
if(obj.flag == "step") {
var arrow = new Arrow(this.x + this.l * 2, this.y, obj.x, obj.y - obj.h / 2);
arrow.drawLeftOrRightToTop(cxt);
} else if(obj.flag == "condition") {
var arrow = new Arrow(this.x + this.l * 2, this.y, obj.x, obj.y - obj.l);
arrow.drawLeftOrRightToTop(cxt);
}
}
Condition.prototype.drawLeftToTop = function(obj) {
if(obj.flag == "step") {
var arrow = new Arrow(this.x - this.l * 2, this.y, obj.x, obj.y - obj.h / 2);
arrow.drawLeftOrRightToTop(cxt);
} else if(obj.flag == "condition") {
var arrow = new Arrow(this.x - this.l * 2, this.y, obj.x, obj.y - obj.l);
arrow.drawLeftOrRightToTop(cxt);
}
}
Condition.prototype.drawRightToLeft = function(obj) {
if(obj.flag == "step") {
var arrow = new Arrow(this.x + this.l * 2, this.y, obj.x - this.w / 2, obj.y);
arrow.drawLeftToRightOrRightToLeft(cxt);
} else if(obj.flag == "condition") {
var arrow = new Arrow(this.x + this.l * 2, this.y, obj.x - this.l * 2, obj.y);
arrow.drawLeftToRightOrRightToLeft(cxt);
}
}
Condition.prototype.drawLeftToRight = function(obj) {
if(obj.flag == "step") {
var arrow = new Arrow(this.x - this.l * 2, this.y, obj.x + this.w / 2, obj.y);
arrow.drawLeftToRightOrRightToLeft(cxt);
} else if(obj.flag == "condition") {
var arrow = new Arrow(this.x - this.l * 2, this.y, obj.x + this.l * 2, obj.y);
arrow.drawLeftToRightOrRightToLeft(cxt);
}
}
//
// flow.js
// <主要逻辑>
//
// Created by DurantSimpson on 2016-12-08.
// Copyright 2016 DurantSimpson. All rights reserved.
//
var canvas = document.getElementById("myCanvas");
var cxt = canvas.getContext('2d');
var start = new Start(600,25);//新建开始对象
var step1 = new Step(600,105);//新建第一个步骤
start.drawBottomToTop(step1); //画箭头(从开始对象指向第一个步骤)
var condition1 = new Condition(300, 200);//新建第一个条件对象
var condition2 = new Condition(450, 200);
var condition3 = new Condition(600, 200);
var condition4 = new Condition(750, 200);
var condition5 = new Condition(900, 200);
step1.drawBottomToTop(condition1);//画箭头(从第一个步骤指向第一个条件)
step1.drawBottomToTop(condition2);
step1.drawBottomToTop(condition3);
step1.drawBottomToTop(condition4);
step1.drawBottomToTop(condition5);
var step2 = new Step(450,295);
var step3 = new Step(750,295);
condition1.drawBottomToTop(step2);
condition2.drawBottomToTop(step2);
condition3.drawBottomToTop(step2);
condition4.drawBottomToTop(step3);
condition5.drawBottomToTop(step3);
var condition6 = new Condition(300, 400);
var condition7 = new Condition(450, 400);
var condition8 = new Condition(750, 400);
var condition9 = new Condition(900, 400);
var condition10 = new Condition(450, 500);
var condition11 = new Condition(900, 500);
var condition12 = new Condition(450, 600);
var condition13 = new Condition(900, 600);
step2.drawBottomToTop(condition6);
step3.drawBottomToTop(condition9);
var step4 = new Step(300,725);
var step5 = new Step(450,725);
var step6 = new Step(600,725);
var step7 = new Step(750,725);
var step8 = new Step(900,725);
condition6.drawBottomToTop(step4);
condition6.drawRightToLeft(condition7);
condition7.drawRightToTop(step6);
condition7.drawBottomToTop(condition10);
condition8.drawBottomToTop(step7);
condition9.drawLeftToRight(condition8);
condition9.drawBottomToTop(condition11);
condition10.drawBottomToTop(condition12);
condition11.drawBottomToTop(condition13);
condition12.drawBottomToTop(step5);
condition13.drawBottomToTop(step8);
/*canvas.onclick = function(e) { //给canvas添加点击事件
e = e || event; //获取事件对象
//获取事件在canvas中发生的位置
var x = e.clientX - canvas.offsetLeft;
var y = e.clientY - canvas.offsetTop;
//如果事件位置在矩形区域中
alert('x:' + x + "y:" + y);
if(x>=rect.x&&x<=rect.x+rect.w&&y>=rect.y&&y<=rect.y+rect.h){
alert('clicked')
}
}*/
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