A drawing-object that applies a supplied function to supplied arguments.
apply-drawing-object is a drawing-object that applies a supplied function to a list of supplied arguments, normally preceded by the objects-displayer. Its main usage is for doing the actual drawing.
apply-drawing-objects can be used repeatedly and concurrently in the same or different panes. The ones that are created by the
make-draw-* functions (make-draw-arc and so on) are fixed, but for objects created by make-a-drawing-call, the supplied function may depend on values that change, and hence needs to be redisplayed when these values change. Use force-objects-redraw on the root of the hierarchy (an objects-displayer or a pinboard-objects-displayer) to do that.
See drawing-object for description of the drawing operation.
CAPI User Guide and Reference Manual (Unix version) - 3 Aug 2017