This function can be used to define how DrawPath() should connect the
lines when drawing a vector path. Currently, the following join styles
are supported:
#JOINMITER:-
Use miter join (a sharp angled corner). This is the default
join mode. The miter limit can be set using the SetMiterLimit()
function. See SetMiterLimit for details.
#JOINROUND:-
Join lines by drawing their ends as circles. This gives a
thick pen impression.
#JOINBEVEL:-
Join lines by cutting off the line ends at the half of the
line width.
Please note that the line join style is only used when drawing vector
outlines. It is obviously not used when filling vector paths.