ART Arrow mark.

Members:

IG_ARTX_arrow_bounds_get	Queries the bounding rectangle of annotation.
IG_ARTX_arrow_create	Creates a new instance of Arrow annotation (IG_ARTX_MARK_ARROW).
IG_ARTX_arrow_endpoint_get	Queries arrow end point.
IG_ARTX_arrow_endpoint_set	Updates arrow end point position.
IG_ARTX_arrow_head_get	Queries attributes of annotation arrow head.
IG_ARTX_arrow_head_set	Sets attributes of annotation arrow head.
IG_ARTX_arrow_highlight_get	Queries the highlight state of annotation.
IG_ARTX_arrow_highlight_set	Sets highlight state of annotation.
IG_ARTX_arrow_line_get	Queries attributes of line used to draw the annotation.
IG_ARTX_arrow_line_set	Sets attributes of line used to draw the annotation.
IG_ARTX_arrow_startpoint_get	Queries arrow start point.
IG_ARTX_arrow_startpoint_set	Updates arrow start point position.