The screen coordinates is what you get in on_input(). It tells you where your cursor is on the screen (lower left being 0:0). The world coordinate is where the cursor is in the game world (ie with camera translation taken into account).
The screen coordinates is what you get in on_input(). It tells you where your cursor is on the screen (lower left being 0:0). The world coordinate is where the cursor is in the game world (ie with camera translation taken into account).