The graphics-state object associated with each port holds values for parameters such as foreground, background, operation, thickness, scale-thickness, mask and font which affect graphics ports drawing to that port.
The full set of parameters is described under graphics-state.
The graphics state values associated with a drawing function call are set by one of three mechanisms.
(draw-line port 1 1 100 100 :thickness 10 :scale-thickness nil :foreground :red)
(with-graphics-state (port :thickness 10 :scale-thickness nil :foreground :red) (draw-line port 1 1 100 100) (draw-rectangle port 2 2 40 50 :filled t))
For common cases of locally changing the transform in the graphics state, there are specific macros:
:transform
.(set-graphics-state port :thickness 10 :scale-thickness nil :foreground :red)
The first two mechanisms change the graphics state temporarily. The last one changes it permanently in port, effectively altering the "default" state.
CAPI User Guide and Reference Manual (Unix version) - 01 Dec 2021 19:32:39