Points to an array of POINT structures that define the vertices of the polygon. The polygon is presumed closed. Each vertex can be specified only once.
cPoints
Specifies the number of points in the array.
fnPolyFillMode
Specifies the fill mode used to determine which pixels are in the region. This parameter can be one of the following values:
Value Meaning
ALTERNATE Selects alternate mode (fills area between odd-numbered and even-numbered polygon sides on each scan line).
WINDING Selects winding mode (fills any region with a nonzero winding value).