Notes:
1. The end styles esButt and esSquare are obviously similar. However with the esButt endstyle, ends are truncated exactly at the path's start and end points, whereas with esSquare, the ends extend the line offset distance away from the paths ends.
2. esPolygon is equivalent to esClosed and predates it. However esPolygon is now deprecated in favour of esClosed, since its name was confusing given that TEndStyle enumerations are only used when drawing lines (open paths).