This enumeration indicates the position of the mouse cursor relative to a mark selection rectangle.

Values:

IG_ARTX_BOUND_NONE	Specifies that point is not on the selection rectangle.
IG_ARTX_BOUND_LEFT_TOP	Specifies that point is on left-top corner of selection rectangle.
IG_ARTX_BOUND_RIGHT_TOP	Specifies that point is on right-top corner of selection rectangle.
IG_ARTX_BOUND_LEFT_BOTTOM	Specifies that point is on left-bottom corner of selection rectangle.
IG_ARTX_BOUND_RIGHT_BOTTOM	Specifies that point is on right-bottom corner of selection rectangle.
IG_ARTX_BOUND_LEFT	Specifies that point is on left side of selection rectangle.
IG_ARTX_BOUND_RIGHT	Specifies that point is on right side of selection rectangle.
IG_ARTX_BOUND_TOP	Specifies that point is on top side of selection rectangle.
IG_ARTX_BOUND_BOTTOM	Specifies that point is on bottom side of selection rectangle.