检查点是在一个旋转矩形（C＃） [英] Check if a point is in a rotated rectangle (C#)

问题描述

我在C＃（Windows窗体）一个程序，它利用了一个PictureBox一些矩形。他们可以在太（旋转）的角度得出。

I have a program in C# (Windows Forms) which draws some rectangles on a picturebox. They can be drawn at an angle too (rotated).

我知道每个矩形起点（左上角），它们的尺寸（宽+高）和他们的角度。由于转动的，开始点是不necessarely的左上角，但是，这并不在这里重要。
然后当我点击PictureBox的，我需要检查其中的矩形（如果有的话）我已经点击了。

I know each of the rectangles' start point (upper-left corner), their size(width+height) and their angle. Because of the rotation, the start point is not necessarely the upper-left corner, but that does not matter here. Then when I click the picturebox, I need to check in which rectangle (if any) I have clicked.

所以，我需要检查，如果以某种方式点是在一个矩形，但我还需要考虑到每个矩形的旋转。
是否有人知道的方式做到这一点在C＃？

So I need some way of checking if a point is in a rectangle, but I also need to take into account the rotation of each rectangle. Does anybody know of a way to do this in C#?

推荐答案

是否有可能将施加同样的旋转以矩形反向点？

Is it possible to apply the same rotation applied to the rectangle to the point in reverse?

例如，矩形A从它的起源（左上角）顺时针旋转45度，你会那么只需旋转b点同样出身顺时针旋转45度左右COUNTER，然后检查，看它是否属于在矩形中的预旋转

For example, Rectangle A is rotated 45 degrees clockwise from its origin (upper left corner), you would then just rotate point B around the same origin 45 degrees COUNTER clockwise, then check to see if it falls within Rectangle A pre-rotation

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