如何从html画布中取消，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);

将图像放在画布上覆盖了整个网络。
但是如何在它之后删除呢？

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：

Draw

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

选项2（适用于非平凡的背景，但速度较慢）：

在绘制图片之前从画布中获取像素数据 ，然后重绘该像素数据以删除该图像。

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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