Drawing and Filling Rectangles

• pxl-prim-rect-draw_rectangle: draw_rectangle/[5,6]
• pxl-prim-rect-draw_rectangles: draw_rectangles/[2,3]
• pxl-prim-rect-fill_rectangle: fill_rectangle/[5,6]
• pxl-prim-rect-fill_rectangles: fill_rectangles/[2,3]