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13.5.2 Drawing on screen

Drawing functions such as draw-line and draw-ellipse modify pixels, but you cannot assume that they have exactly the same effect on all platforms. Some platforms might put pixels below and to the right of integer coordinates (x y) while others may center the pixel at (x y) .

This applies to all the drawing functions which are documented in the Graphics Ports chapter of the LispWorks CAPI Reference Manual - see the entries for functions with names beginning draw- .

CAPI User Guide (Windows version) - 30 Aug 2011