| | Describes a bounding box in 2D space.
A bounding box is parallel to the axes of the coordinates
system. If it is finite, it is defined by the two intervals:
- [ Xmin,Xmax ], and
- [ Ymin,Ymax ].
A bounding box may be infinite (i.e. open) in one or more
directions. It is said to be:
- OpenXmin if it is infinite on the negative side of the "X Direction";
- OpenXmax if it is infinite on the positive side of the "X Direction";
- OpenYmin if it is infinite on the negative side of the "Y Direction";
- OpenYmax if it is infinite on the positive side of the "Y Direction";
- WholeSpace if it is infinite in all four directions. In
this case, any point of the space is inside the box;
- Void if it is empty. In this case, there is no point included in the box.
A bounding box is defined by four bounds (Xmin, Xmax, Ymin and Ymax) which
limit the bounding box if it is finite, six flags (OpenXmin, OpenXmax, OpenYmin,
OpenYmax, WholeSpace and Void) which describe the bounding box if it is infinite or empty, and
- a gap, which is included on both sides in any direction when consulting the finite bounds of the box.
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1.6.3