etClosedPolygon: Ends are joined using the JoinType value and the path filled as a polygon
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etClosedLine: Ends are joined using the JoinType value and the path filled as a polyline
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etOpenSquare: Ends are squared off and extended delta units
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etOpenRound: Ends are rounded off and extended delta units
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etOpenButt: Ends are squared off with no extension.
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etOpenSingle: Offsets an open path in a single direction. Planned for a future update.
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Note: With etClosedPolygon and etClosedLine types, the path closure will be the same regardless of whether or not the first and last vertices in the path match.