I first started the how to make Java games series to solve a bunch of problems. Many people in the forms are posting extremely complicated ways to rotate polygons in Java for example. It is very easy to rotate polygons!
I also saw many people struggle with other calculations like: Finding the length and angle of a line between vectors / Calculate the points of a rotating polygon / Calculate the area of irregular polygons / Find the center points of an irregular polygon / Repeat keyboard clicks if the user holds down a key…