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-If you copy the whole @win over @win1 at coordinate '''16''',0 you would get (drawcopy @win 0 0 @win1 16 0): [[File:Drawpic&copy_negative1.png]]
 
-If you copy the whole @win over @win1 at coordinate '''16''',0 you would get (drawcopy @win 0 0 @win1 16 0): [[File:Drawpic&copy_negative1.png]]
  
-Now we use a negative width of -16 to flip horizontally the bitmap (drawcopy @win 0 0 16 16 @win1 16 0 -16 16): [[File:Drawpic&copy_negative2.png]]
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-Now we use a negative width of -16 to flip horizontally the bitmap, the bitmap will be drawn at 16 - 15 = 1 so that after the flip, the last pixel of the bitmap on the 'x' axis is at the 'x' coordinate ('''16''' in this example) (drawcopy @win 0 0 16 16 @win1 16 0 -16 16): [[File:Drawpic&copy_negative2.png]]
 
 
One issue: the flipped bitmap is drawn at x + 1 instead of x, you have to draw at x - 1 or y - 1 when you flip.
 
  
 
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