This is a line clipper. If you put the inputs for the top left and bottom right points, the clipper will clip the line and then render it if it is on the screen. If it is off the screen, it won't render it at all. This can speed up the rendering of a pen game by huge amounts, as well as cutting out the annoying scratch problem of warping lines. The blocks are inside.
All by me/my dad. We looked up some math on Wikipedia and figured it out. Feel free to use with credit!
