垂直于给定线的绘制线 [英] Drawing line perpendicular to a given line

问题描述

我有一行的开始和结束坐标。我想要绘制另一行贴在这个结束，这样，他们将彼此垂直。

I have start and end coordinate of a line. I want to drawn another line sticking at the end of this this such that they will be perpendicular to each other.

我试图这样做使用正常的几何。

I am trying to do this using the normal geometry. Is there any high-level API there in MFC for the same.

感谢

推荐答案

如果（dx，dy）是给定线的x和y坐标的差异，则可以通过设计其坐标差为（-dy，dx）使另一条线垂直。您可以通过任何因子（-c * dy，c * dx）缩放以更改其长度。

If (dx,dy) are the differences in the x and y coodinates of the given line, you can make another line perpendicular by contriving for the differences in its coordinates to be (-dy, dx). You can scale that by any factor (-c*dy, c*dx) to change its length.

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