画布中的擦除功能

Question

I need to erase the contents of my canvas. I can achieve this by using 'globalCompositeOperation = "destination-out"'. I have already stored the draw coordinates in my json object, but after erasing I need to update my json object. I tried to capture it's x,y co-ordinate on mouse move (while erasing). Then I matched the same with my previous store object and updated the same. But it's quite a big procedure which causes degradation in my performance. Is there any other way to do it?

Answer 1

This will clear all contents of your canvas. (Assuming that ctx is your context, and width and height are the width and height of your canvas.

ctx.clearRect(0, 0, width, height)