碰到边缘就反弹
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预备知识
”碰到边缘就反弹”编程积木
只要角色触碰到舞台边缘，这个编程积木就会改变角色的方向。
https://cdncreaticodecom.b-cdn.net/scratch-gui-projects/forum/55342371-edda-448f-984c-43bafed6da08.png" width="250" style="filter: drop-shadow(0.35rem 0.35rem 0.4rem rgba(0, 0, 0, 0.5));">
向右移动，向左反弹
假设一个球体角色正在向右边移动。
移动方向
如果我们改变角色的方向，角色将会朝着新方向移动。
角色被用户窗口困住
角色是不能走出用户窗口的。一旦靠近窗口边缘，角色将会留下一个“小尾巴”，以便我们可以抓住它。
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