Drawing A Line
To draw a line on Form1, call the procedure
Form1.Line (x1, y1) - (x2, y2)
If there is only one form, the form name can be elided (not be used) (e.g. Line (x1, y1) – (x2, y2))
To get a color, follow the positioning information with the specification of the color
Form1.Line (x1, y1) - (x2, y2), RGB(255,255,255)
Draw a white line beginning x1 units from the Left and y1 units from Top, and extending to a point x2 units from Left and y2 units down from Top
Notice the “minus” between the two coordinates