/** @see Object3D#union(Object3D) */
public Object3D union(Object3D space) {
if (this.isContained(space)) return this;
if (space.isContained(this)) return space;
if (space instanceof Line3D) {
/*
* Try to avoid construction of an Object3DCombined.
* If grade and offset in xz and xy area are matching and both lines
* have a common x-range just create a longer Line3D.
*/
Line3D other = (Line3D) space;
if ((other.gradeY == this.gradeY)
&& (other.gradeZ == this.gradeZ)
&& (other.offsetY == this.offsetY)
&& (other.offsetZ == this.offsetZ)) {
if ((this.start.x <= other.start.x) && (this.end.x >= other.start.x)) {
return new Line3D(this.start, other.end);
}
if ((this.start.x <= other.end.x) && (this.end.x >= other.end.x)) {
return new Line3D(other.start, this.end);
}
}
}
return new Object3DCombined(this).union(space);
}
