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Polygon()
Draw a closed polygon
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Syntax
Polygon( <hDC>, <aPoints> )   -->   lSuccess

Arguments
<hDC> is a handle to the device context on which to draw.

<aPoints> is an array of points.  Each point is itself an
array giving the x- and y- position of the point.

Returns
If successful, logical TRUE (.T.) is returned, otherwise FALSE
(.F.) is returned.

Description
This function draws a polygon by drawing lines between a
series of points, using the current pen for the lines.  If the
points do not specify a closed figure, the figure is closed by
drawing a line from the last point to the first.  The interior
is filled using the current brush.

Example
aPoints = {  { 100, 100 },  { 200, 100 },  { 200, 200 },  {100, 200 }  }
Polygon( hDC, aPoints )            // a square, closed automatically
// now a triangle
Polygon( hDC, {  { 50, 50 },  { 60, 100 },  { 100, 30 }  } )