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. |