裁剪区域的开始纵坐标 param
前面的两个10,是标志了描绘这个矩形的开始坐标。
The two 10's are the x and y position that we will draw this rectangle at.
这些属性允许 GDI 函数只有少量参数,比如开始坐标。
These attributes allow GDI functions to have just a few arguments, such as starting coordinates.
从这个点开始,画线连接到后面的点,并且后一个点由前一个点的相对坐标指定。
Starting from such a point, lines are draws to following points, where any following point is specified with relative coordinates to its preceding point.
It says if I want to get the length of a segment, going to pass in that instance, it says from that instance, get the start point, that's the thing I just found.
它的意思是如果我想要,得到一个线段的长度,首先要把这个实例传进来,然后对于这个实例,从开始点,取得x坐标,然后通过同样的操作。
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