合并两个dataURI以创建单个图像 [英] Merge two dataURIs to create a single image

问题描述

我想生成由标签和图标组成的图像。标签部分会有很多变化（50-100），而大约有10个图标。我想通过将最终图像分成两部分，即标签图像和图标图像，以模块化方式制作最终图像。我将构建一个服务，返回标签的dataURI，同时图标dataURI将嵌入页面中。然后我想结合这两个不同的dataURI来创建一个表示组合图像的dataURI。

我如何在客户端执行此操作？

解决方案

您可以使用数据uris创建图像，然后使用 canvas 绘制包含它们的新图像。这是一个简单的例子：

  var nloaded = 0; function checkload（event）{nloaded ++; if（nloaded< 2）{return; } var canvas = document.querySelector（'canvas'）; var context = canvas.getContext（'2d'）; context.drawImage（image1,0,0,50,50）; context.drawImage（image2,50,50,100,100）; var combined = new Image; combined.src = canvas.toDataURL（'data / gif'）; document.body.appendChild（组合）;} VAR image1的新=图片; image1.onload = checkload; image1.src = '数据：图像/ GIF; BASE64，R0lGODdhAgACALMAAAAAAP /// wAAAAAAAP8AAAAAAAAAAAAAAAAA / wAAAAAAAAAAAAAAAAAAAAAAAAAAACwAAAAAAgACAAAEAxBJFAA7'; VAR IMAGE2 =新的图像; image2.onload = checkload; image2.src = '数据：图像/ GIF; BASE64，R0lGODdhAgACALMAAAAAAP /// wAAAAAAAP8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACwAAAAAAgACAAAEA5BIEgA7';  

<预类=片段化码的CSS lang-css prettyprint-override> canvas {display：none;}

 <画布宽度= 100高度= 100>< / canvas>  

。

从数据URI加载图像并使用 drawImage组合

code>画布上下文的命令，您可以使用画布创建一个新图像，如：

  var combined = new图片; 
 combined.src = canvas.toDataURL（'data / gif'）; 
  

不幸的是，这在IE8中不起作用。

I want to generate images consisting of a label and an icon. The label part is going to vary a lot (50-100) while there are about 10 icons. I would like to make the final images in a modular way by splitting the final image in two parts, a label image and an icon image. I will build a service that returns dataURI for the labels while the icon dataURIs will be embedded in the page. Then I would like to combine these two different dataURIs to create a single dataURI representing a combined image.

How can I do this on the client side?

解决方案

You can create images using your data uris and then draw a new image that includes them using canvas. Here's a simple example:

var nloaded = 0;
function checkload(event) {
  nloaded++;
  if (nloaded < 2) {
    return;
  }
  
  var canvas = document.querySelector('canvas');
  var context = canvas.getContext('2d');
  context.drawImage(image1, 0, 0, 50, 50);
  context.drawImage(image2, 50, 50, 100, 100);

  var combined = new Image;
  combined.src = canvas.toDataURL('data/gif');
  
  document.body.appendChild(combined);
}

var image1 = new Image;
image1.onload = checkload;
image1.src = 'data:image/gif;base64,R0lGODdhAgACALMAAAAAAP///wAAAAAAAP8AAAAAAAAAAAAAAAAA/wAAAAAAAAAAAAAAAAAAAAAAAAAAACwAAAAAAgACAAAEAxBJFAA7';


var image2 = new Image;
image2.onload = checkload;
image2.src = 'data:image/gif;base64,R0lGODdhAgACALMAAAAAAP///wAAAAAAAP8AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAACwAAAAAAgACAAAEA5BIEgA7';

canvas {
    display: none;
}

<canvas width=100 height=100></canvas>

.

Once you have the images loaded from the data URI and combined using the drawImage commands of the canvas context you can use the canvas to create a new image like:

var combined = new Image;
combined.src = canvas.toDataURL('data/gif');

Unfortunately this won't work in IE8.

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