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661: Mainline

Now, if you want to draw a simple horizontal line, at position (0, 50), with length equal to 100, you use the pen as the receiver of the lineFrom:to: message:

 *-- Pen instance 
 | 
 |               *------ x coordinate of one end 
 |               |   *-- y coordinate of that end 
 v               v   v 
thePen lineFrom: 0 @ 50 to: 100 @ 50. 
                             ^    ^ 
                             |    *-- y coordinate of the other end 
                             *------- x coordinate of the other end