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javascript - 如何将图像插入 Canvas 弧形?

转载 作者:行者123 更新时间:2023-11-29 21:57:55 27 4
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这是我的脚本,我试图将图像插入到弧形 Canvas 中以仅替换黑色部分但没有解决方案:/这是我第一次在 Stack 上发帖,希望你能帮助我。也可以看到脚本的 fiddle :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 弧形?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25416080/

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