ART Rectangle mark object.

Members:

IG_ARTX_rectangle_border_get	Queries the annotation border.
IG_ARTX_rectangle_border_set	Updates the annotation border.
IG_ARTX_rectangle_bounds_get	Queries the bounding rectangle.
IG_ARTX_rectangle_bounds_set	Updates the bounding rectangle.
IG_ARTX_rectangle_create	Creates an instance of the Rectangle mark.
IG_ARTX_rectangle_fillcolor_get	Queries fill color of the annotation.
IG_ARTX_rectangle_fillcolor_set	Updates the annotation fill color.
IG_ARTX_rectangle_opacity_get	Queries the value of annotation opacity.
IG_ARTX_rectangle_opacity_set	Updates the value of annotation opacity.