What is the main purpose of the function addShapes in the provided code?

The function addShapes is primarily designed to fill the screen with shapes. When invoked, it typically iterates through a set of predefined coordinates or parameters to generate new shapes at various locations on the canvas. This results in visually enhancing the scene by populating it with shapes, such as circles, squares, or any other geometric forms defined in the code.

This serves a crucial role in creating dynamic visuals in animation or game projects where the presentation of various shapes is key to the aesthetic or functionality of the program. By understanding this purpose, one can effectively utilize the function to create engaging graphics or to achieve specific design goals in coding projects.