从Blob或base64 img src将图像添加到Fabric js画布

时间:2018-07-05 19:20:51

标签: javascript jquery canvas base64 fabricjs

很抱歉,如果我问错了这个问题。

我将画布转换为图像,并且将图像隐藏在具有imgSrc类的页面上

画布图像中的src返回一个base64对象

<img class="imgSrc" src="data:image/png;base64,ifsdfjdjkdjf;sfjjfskfdjdf">

我收到错误

无法在“ CanvasRenderingContext2D”上执行“ drawImage”:提供的值不是类型

当尝试使用Fabric js将图像添加到画布时

var canvas = this.__canvas = new fabric.StaticCanvas('canvas1');
var imgElement = document.getElementsByClassName('imgBox');
var imgInstance = new fabric.Image(imgElement, {
 left: 100,
 top: 100,
 height: 30, 
 width: 30
});
canvas.add(imgInstance);

我想首先与图像src进行某种对话吗?

1 个答案:

答案 0 :(得分:1)

getElementsByClassName返回节点列表,通过list [0]获取第一个元素,并创建图像对象。

演示

var canvas = new fabric.Canvas('canvas');
var imgElement = document.getElementsByClassName('imgSrc')[0];
var imgInstance = new fabric.Image(imgElement, {
 left: 100,
 top: 100,
 scaleX: 200/imgElement.width,
 scaleY: 200/imgElement.height
});
canvas.add(imgInstance);
canvas {
  border: 1px solid #999;
}
<script src="https://rawgit.com/kangax/fabric.js/master/dist/fabric.js"></script>
<img class='imgSrc' src="data:image/png;base64,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"/>

<canvas id="canvas" width="400" height="400"></canvas>