Check if a point is in a rotated rectangle (C#)

Question

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

I know each of the rectangles\' star

Answer 1

You could keep a second, undisplayed image where you draw duplicates of the rectangles, each uniquely colored. When the user clicks on the picturebox, find the color of the corresponding pixel in the 2nd image, which will identify which rectangle was clicked.