直播app系统源码,给视频背景添加上水印
直播app系统源码,给视频背景添加上水印
//配置示例
{
container = document.body,
width = '200px', //水印宽度
height = '148px', //水印宽度
textAlign = 'content', //水印方向
textBaseline = 'middle',
font = '16px Microsoft Yahei', //水印字体格式
content = '水印', //水印内容
rotate = '45', //字体倾斜角度
zIndex = 10000,
}
//实现代码
const canvasInfo = function({
container = document.body,
width = '200px',
height = '148px',
textAlign = 'content',
textBaseline = 'middle',
font = '16px Microsoft Yahei',
content = '水印',
rotate = '45',
zIndex = 10000,
} = {}) {
const canvas = document.createElement('canvas'); //创建canvas
canvas.setAttribute('width', width); //添加canvas属性
canvas.setAttribute('height', height);
const ctx = canvas.getContext('2d');
ctx.textAlign = textAlign;
ctx.textBaseline = textBaseline;
ctx.font = font;
ctx.rotate((Math.PI / 180) * rotate); //旋转角度
ctx.fillText(content, parseFloat(width) / 2, parseFloat(height) / 2);
const base64Url = canvas.toDataURL()
const watermarkDiv = document.createElement('div');
const styleStr =
` position:fixed;
top:0;
left:0;
bottom:0;
right:0;
width:100%;
height:100%;
z-index:${zIndex};
background-image:url('${base64Url}');
opacity: 0.1;
`;
watermarkDiv.setAttribute('style', styleStr);//添加div属性
container.insertBefore(watermarkDiv, container.firstChild); //向列表中插入
}
canvasInfo()
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