Question

我正在尝试裁剪图像并将其存储在图像对象中。我在互联网上的某个地方找到了以下代码，它在画布上绘制了裁剪图像。我想将它存储在图像对象中并将该对象附加到正文。我尝试使用canvas.toDataURL（'image / jpeg'）将画布转换为图像;但它不起作用。

<!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');
      var imageObj = new Image();

      imageObj.onload = function() {
        // draw cropped image
        var sourceX = 150;
        var sourceY = 0;
        var sourceWidth = 150;
        var sourceHeight = 150;
        var destWidth = sourceWidth;
        var destHeight = sourceHeight;
        var destX = canvas.width / 2 - destWidth / 2;
        var destY = canvas.height / 2 - destHeight / 2;

        context.drawImage(imageObj, sourceX, sourceY, sourceWidth, sourceHeight, destX, destY, destWidth, destHeight);
      };
      imageObj.src = 'https://www.html5canvastutorials.com/demos/assets/darth-vader.jpg';
    </script>
  </body>
</html>

有人可以帮我这个吗？

谢谢！

如何将画布存储到图像中？

0 个答案: