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我在Qt Graphics View控件中有几条直线,假设分别为l1,l2. 现在我想实现的就是画直线的这个效果,比如先出现l1,再出现l2,并且最好能够有l1这条直线从l1的起点到终点的这个过程。我是新手,希望各位大佬能给个实现思路。谢谢。