This is a very short post and a time saver.
This Demo is last year just contact small program did not long write, throw directly in the folder corner a little pity, take out to share to just the entry of the students reference. The source code does not write remarks, function name is remarks, look at the function name should be able to guess what I am writing 😂.
The animation in this paper is drawn on Canvas, so I will not paste the code here, but look at the effect picture directly. If you are interested in seeing the implementation, click here to see the source code.