如何从 html 画布中取消绘制、隐藏、删除或删除图像? [英] How to undraw, hide, remove, or delete an image from an html canvas?

问题描述

this.context.drawImage(myimage, 0, 0);

将图像放在画布上已经很好地覆盖了整个网络.但是出现后如何删除呢?

Putting the image on the canvas is pretty well covered all over the web. But how do I remove it after it's there?

推荐答案

选项1:
在其上绘制一个与背景颜色相同的矩形.

Option 1:
Draw a rectangle over it of the same color as the background.

选项 2(适用于非平凡背景，但速度较慢):
在绘图前从画布中获取像素数据图像，然后重绘该像素数据以移除图像.

Option 2 (works for non-trivial background, but slower):
Get the pixel data from the canvas before drawing the image, then redraw that pixel data to remove the image.

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