图像到画布/HTML5 转换

发布于 2024-09-05 15:44:29 字数 1539 浏览 9 评论 0原文

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倾其所爱 2024-09-12 15:44:29

这是一个生成 JavaScript 代码以在画布上绘制图像的工具: http://lab.abhinayrathore.com/ img2canvas/

Here is a tool that will generate JavaScript code to draw the image on canvas: http://lab.abhinayrathore.com/img2canvas/

予囚 2024-09-12 15:44:29

您不需要任何转换,只需使用图像(通过 url 或 DOM 中的任何一个新图像)

canvas.drawImage(image, dx, dy)
canvas.drawImage(image, dx, dy, dw, dh)
canvas.drawImage(image, sx, sy, sw, sh, dx, dy, dw, dh)

(取自 此处)。

请参阅 developer.mozilla.org< 上的教程< /a>.

You don't need no conversion, just use the image (either new by url or any one in the DOM) by

canvas.drawImage(image, dx, dy)
canvas.drawImage(image, dx, dy, dw, dh)
canvas.drawImage(image, sx, sy, sw, sh, dx, dy, dw, dh)

(taken from here).

See the tutorial on developer.mozilla.org.

不弃不离 2024-09-12 15:44:29

您可以使用上面列出的网站,但这里是相关代码:

function convertImage(canvas, callback) {
var image = new Image();
image.onload = function(){
callback(image);
}
image.src = canvas.toDataURL("image/png");
}

另外,我整理了一个 工作 jsfiddle 演示

You can use the site listed above, but here is the relevant code:

function convertImage(canvas, callback) {
var image = new Image();
image.onload = function(){
callback(image);
}
image.src = canvas.toDataURL("image/png");
}

Also, I put together a working jsfiddle demo.

烟燃烟灭 2024-09-12 15:44:29

w3school 给出了答案:
http://www.w3schools.com/tags/canvas_drawimage.asp

window.onload = function() {
    var c=document.getElementById("myCanvas");
    var ctx=c.getContext("2d");
    var img=document.getElementById("scream");
    ctx.drawImage(img,10,10);
};

w3school has the answer:
http://www.w3schools.com/tags/canvas_drawimage.asp

window.onload = function() {
    var c=document.getElementById("myCanvas");
    var ctx=c.getContext("2d");
    var img=document.getElementById("scream");
    ctx.drawImage(img,10,10);
};
楠木可依 2024-09-12 15:44:29
     <!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>      
     <!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>      
梦幻之岛 2024-09-12 15:44:29

Inkscape 实际上可以将文件保存为 HTML5 Canvas 格式。针对 SVG 进行了测试。

Inkscape can actually save files to HTML5 Canvas format. Tested for SVG.

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