如何拍摄画布的屏幕截图？ [英] How to take screenshot of canvas?
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问题描述
如何拍摄画布的屏幕截图？
how to take screenshot of canvas?
或如何在画布上创建由图像+自由区组成的图像？
or How create image, which will consist of image + free zone , located on canvas?
推荐答案
这取决于您的框架，但基本上可以使用 canvas.toDataURL（）
It depends on your framework but basically you can use canvas.toDataURL()
下面是一个完整的示例
<!DOCTYPE HTML>
<html>
<head>
<style>
body {
margin: 0px;
padding: 0px;
}
</style>
</head>
<body>
<canvas id="myCanvas" width="578" height="200"></canvas>
<script>
var canvas = document.getElementById('myCanvas');
var context = canvas.getContext('2d');
// draw cloud
context.beginPath();
context.moveTo(170, 80);
context.bezierCurveTo(130, 100, 130, 150, 230, 150);
context.bezierCurveTo(250, 180, 320, 180, 340, 150);
context.bezierCurveTo(420, 150, 420, 120, 390, 100);
context.bezierCurveTo(430, 40, 370, 30, 340, 50);
context.bezierCurveTo(320, 5, 250, 20, 250, 50);
context.bezierCurveTo(200, 5, 150, 20, 170, 80);
context.closePath();
context.lineWidth = 5;
context.fillStyle = '#8ED6FF';
context.fill();
context.strokeStyle = '#0000ff';
context.stroke();
// save canvas image as data url (png format by default)
var dataURL = canvas.toDataURL();
</script>
</body>
</html>
dataUrl将包含图像，您可以将其保存在任何位置。
dataUrl will contains the image and you can save it wherever you want.
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