javascript fabric.js - 从画布 API 的 ImageData 对象创建 Image 对象
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时间：2020-10-27 13:16:01 来源:igfitidea点击:
fabric.js - create Image object from ImageData object of canvas API
提问by Tom
I want to create an image object in fabric.js from ImageDataobject, we can get ImageData from this:
我想从对象在 fabric.js 中创建一个图像对象ImageData，我们可以从中获取 ImageData：
var imgData=ctx.getImageData(10,10,50,50);
//ctx.putImageData(imgData,10,70);
// something liket that
var image = new fabric.Image.fromImageData (...);
Is there any way to create an image object from ImageDataobject?
有没有办法从ImageData对象创建图像对象？
回答by Tom
Let me put my idea here, I don't like this way but have no others around -
让我把我的想法放在这里，我不喜欢这样，但周围没有其他人 -
var ctx = canvas.getContext('2d');
var data = ctx.getImageData(0, 0, 20, 20);
var c = document.createElement('canvas');
c.setAttribute('id', '_temp_canvas');
c.width = 20;
c.height = 20;
c.getContext('2d').putImageData(data, 0, 0);
fabric.Image.fromURL(c.toDataURL(), function(img) {
img.left = 50;
img.top = 50;
canvas.add(img);
img.bringToFront();
c = null;
$('#_temp_canvas').remove();
canvas.renderAll();
});
