This enumeration specifies available arrow head styles.

Values:

IG_ARTX_ARROW_POINTER	Specifies a simple arrow pointer.
IG_ARTX_ARROW_SOLID	Specifies a solid arrow pointer.
IG_ARTX_ARROW_OPEN	Specifies an open arrow pointer.
IG_ARTX_ARROW_POINTER_SOLID	Specifies a closed solid arrow pointer.
IG_ARTX_ARROW_NONE	Specifies an empty pointer (no arrow).