本文介绍了如何拍摄画布的屏幕截图?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

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.

这篇关于如何拍摄画布的屏幕截图?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-05 17:27