ClosePoly
ClosePoly Stop recording polygon vertices
#include <Quickdraw.h> Quickdraw
void ClosePoly( );
ClosePoly completes the action started by OpenPoly. Recording of
endpoints ceases and the smallest rectangle enclosing the polygon is calculated
and saved in the polyBBox field of the Polygon structure.
Returns: none

Notes: This shows the pen once more by calling ShowPen to balance the call to
HidePen made by OpenPoly.
It is OK to have a polygon that is not a closed figure. In such a case,
functions like FillPoly and InvertPoly act as if a final line had been
drawn, connecting the last endpoint with the first. The FramePoly
function makes no such judgement, drawing only the lines recorded in the
Polygon structure.
See OpenPoly for an example of usage.