Showcase timestamps:
00:00 - 00:19 512 rectangles under the mouse
00:20 - 00:27 2000 pixels falling
00:28 - 00:41 2x20 random triangles in two separate boxes
00:50 - 00:55 simple triangle movement
00:56 - 01:13 another triangle test
01:14 - 01:27 ms based colored custom clock on top
01:28 - 01:39 horizontal mouse ruler with mouse coordinates
01:40 - 01:48 3x colored pie
01:49 - 01:57 ellipse test
01:58 - 02:08 colored moving boxes
02:09 - 02:20 falling object at 144 fps
02:21 - 03:03 1024 objects under mouse
Sometimes it is convenient to create simple graphics on a layered window and displays them.
This video shows a few examples of what can be achieved with GDI+ and AutoHotkey.