29行代码使用HTML5 Canvas API绘制一颗红心
2023-09-14 09:03:56 时间
源代码:
<html>
<div style="width:200px;height:200px;"id="cloud">test canvas</div>
<canvas style="display:none;"id="can"width="200"height="200"></canvas>
<script>(function() {
var canvas = document.getElementById('can'), context;
if(!canvas.getContext) {
alert('你的浏览器不支持 canvas!');
return;
}
context = canvas.getContext('2d');
context.fillStyle = 'red';
context.beginPath();
context.moveTo(75,40);
context.bezierCurveTo(75,37,70,25,50,25);
context.bezierCurveTo(20,25,20,62.5,20,62.5);
context.bezierCurveTo(20,80,40,102,75,120);
context.bezierCurveTo(110,102,130,80,130,62.5);
context.bezierCurveTo(130,62.5,130,25,100,25);
context.bezierCurveTo(85,25,75,37,75,40);
context.fill();
var url = context.canvas.toDataURL();
document.getElementById('cloud').style.backgroundImage = 'url("' + url + '")';
})();
</script>
</html>
效果如下:
实现原理:
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