RECT_P([G], [x1, y1], [x2, y2], [edgeColor],[fillColor])
Draws a rectangle on G, with diagonal defined by points (x1,y1) and (x2,y2), using edgeColor for the perimeter and fillColor for the inside.
The following values are optional and their defaults are listed:
x1, y1=top left corner of G
x2, y2=bottom right corner of G
Note: To erase a GROB, execute RECT(G). To clear the screen, execute RECT().
RECT_P — Discussion