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.标签部分会变化很大(50-100)，而大约有 10 个图标.我想通过将最终图像分成两部分(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，该服务返回标签的 dataURI，而图标 dataURI 将嵌入到页面中.然后我想组合这两个不同的 dataURI 来创建一个表示组合图像的单个 dataURI.

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.

如何在客户端执行此操作?

How can I do this on the client side?

推荐答案

您可以使用数据 uri 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:

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>

.

从数据 URI 加载图像并使用画布上下文的 drawImage 命令组合后，您可以使用画布创建新图像，例如:

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');

不幸的是，这在 IE8 中不起作用.

Unfortunately this won't work in IE8.

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