hi, this is my first big project with GDI+, it tries to simulate gravity motion (this is the most difficult), but also uniformly accelerated motion and constant motion, it also shows additional informations, and allow the user to pause, change simulation speed, and more features i'm constantly improving and adding. well, here's the code #include <GDIPlus.au3> HotKeySet("{ESC}", "ExitProgram") HotKeySet("{SPACE}", "TogglePause") HotKeySet("{+}", "RaiseSpeed") HotKeySet("{-}", "LowerSpeed"