Question

Given I have a canvas that contains many shapes, lets say rectangles for now.

Each shape has a location (inches), size(inches) and rotation angle(degrees).

When a mouse click event happen inside the canvas for a location (x,y) in pixels.

I want to check if the clicked mouse position is inside/within a specific shape, considering the rotation angle and measurement unit conversion.

Can you help?

Answer 1

I found the answer (I have to convert al measurements to pixels to make sure it will calculate correctly):

public static bool HitTest(Rectangle bounds, float angle, Point location)         {             if (angle == 0) return bounds.Contains(location);              using (Matrix matrix = new Matrix())             {                 matrix.RotateAt(angle, Center(bounds));                 using (GraphicsPath path = new GraphicsPath())                 {                     path.AddRectangle(bounds);                     path.Transform(matrix);                     return path.IsVisible(location.X, location.Y);                 }             }         }