SetLineJoin -- define current line join style (V5.0)
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:

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.

Join lines by drawing their ends as circles. This gives a thick pen impression.

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.

desired line join style (see above for possible settings)

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