In-Tile Mouse Pixel Counter

Hello! I use Pyxel primarily for game asset design and occasional pixel art. I thought that it would be helpful to have a small pixel counter from the beginning of each tile you enter. So for example a small counter that's next to the mouse (Not to close so you can still see what you are working on.) where when you drag a line through each tile it would start from where ever you enter and count until the adjacent side is met where it would reset if you continue on. I think it would be very good for if you are making an asset for example that need to be symmetrical faster to do by free hand.