This function can be used to define how DrawPath() should draw the
endings of lines that are not connected to another vertices. Currently,
the following cap styles are supported:
#CAPBUTT:-
Do not draw any special line ending. Just stop drawing
where the line ends. This is the default mode.
#CAPROUND:-
Draw round line endings.
#CAPSQUARE:-
Draw squared line endings.
Please note that the line cap style is only used when drawing vector
outlines. It is obviously not used when filling vector paths.