![[index]](../icons/index.gif)
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((draw-line viewport) p1 p2 color)
Takes a viewport descriptor. It returns a function that
draws a line in the viewport connecting positions p1 and p2.
The optional color argument defaults to black.
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((clear-line viewport) p1 p2)
Takes a viewport descriptor. It returns a function that
clears a line in viewport connecting positions p1 and p2.
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((flip-line viewport) p1 p2)
Takes a viewport descriptor. It returns a function that
flips a line in viewport connecting positions p1 and p2.
PLT