这是我的脚本,我试图将图像插入弧形画布以仅替换黑色部分,但没有解决方法:/这是我第一次在Stack上发布文章,希望能对我有所帮助。
还要看脚本的小提琴:http://jsfiddle.net/a1u6jmfj/
<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 0px;
}
</style>
</head>
<body>
<canvas id="myCanvas" width="578" height="250"></canvas>
<script>
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
var x = canvas.width / 2;
var y = canvas.height / 2;
var radius = 50;
var startAngle = 1.1 * Math.PI;
var endAngle = 1 * Math.PI;
var counterClockwise = false;
context.beginPath();
context.arc(x, y, radius, startAngle, endAngle, counterClockwise);
context.lineWidth = 100;
// line color
context.strokeStyle = 'black';
context.stroke();
</script>
</body>
</html>
最佳答案
您可以使用Compositing
var image = new Image();
image.src = /*image url*/;
image.onload = function() {
context.save();
context.globalCompositeOperation = 'source-in';
context.drawImage(image, 0, 0);
context.restore();
};
Example
关于javascript - 如何将图像插入 Canvas 弧?,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/25416080/