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https://youtu.be/-9EPdenniME
没有用很复杂的逻辑，简简单单就做出了丰富的效果。作为入门教程很棒。
跟着做，并且稍微更新了一点功能。
->在2d屏幕中鼠标左键创建flower ->鼠标右键清屏幕
flower.vl
