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   这是最近在项目中遇到的，本来想着很简单的，但是结果并不是那样的，首先根据直线的斜率划分
   前提条件是每个单元格的单位为1。.
      第一种情况是，斜率的绝对值小于1的情况
      第二种情况是，斜率的绝对值大于1的情况
     首先让我来说说第一种情况
     这条线段的两个点分别在两种不同颜色的格子中
     我先把在紫色格子中（左边的格子）的点定义为firstPoint，线段的另一个点定义]]>