nt">C#&nbsp;&nbsp;&raquo;</span> <b>public enum</b> PolyType { ptSubject, ptClip };</p>
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  <p class="Body"> Boolean (clipping) operations are mostly applied to two sets of Polygons, represented in this library as <em>subject</em> and <em>clip</em> polygons. Whenever Polygons are added to the Clipper object, they must be assigned to either subject or clip polygons.<br><br> UNION operations can be performed on one set or both sets of polygons, but all other boolean operations require both sets of polygon