I am fairly new to graphics32 and unfortunately documentation about it is very sparse.
On a TImage32 I would like to let the user mark a rectangular area with the mouse as usual by clicking with the left mouse button to mark the start and then dragging the mouse with a pressed left mouse button until the rectangle like he wants it. When the user releases the left mouse button the area he defined should be marked with a rectangle (TPolygon32?) so that the border of the rectangle shows marching ants.
If someone could write me a little sample I would be very happy.