Drawing a box exactly where you want it?

[vdemons]

I am trying to make multiple boxes for a game I am working on, forcibly using the drawbox (x1, y1, x2, y2, Color : int) command. I want to make a piano out of a series of boxes but i don't know where the coordinates for the box end up, is there an easier way to do this, maybe a visual grid showing the coordinates or something cause my teacher wants me to use the drawbox command.

Please and Thank you in Advance!

[RandomLetters]

The coordinates are in pixels, with 0,0 in the bottom left corner, so it's like a graph grid.

You can use maxx and maxy to get the coordinate at the edge of the screen.