ArtX Point mark.
Members:
| IG_ARTX_point_color_get | Queries the Color attribute. |
| IG_ARTX_point_color_set | Updates the Color attribute. |
| IG_ARTX_point_create | Creates point mark. |
| IG_ARTX_point_opacity_get | Queries the Opacity attribute. |
| IG_ARTX_point_opacity_set | Updates the Opacity attribute. |
| IG_ARTX_point_width_get | Queries the Width attribute. |
| IG_ARTX_point_width_set | Updates the Width attribute. |
| IG_ARTX_point_x_get | Queries the X coordinate. |
| IG_ARTX_point_x_set | Updates the X coordinate. |
| IG_ARTX_point_y_get | Queries the Y coordinate. |
| IG_ARTX_point_y_set | Updates the Y coordinate. |