/**
* Computes an intersection point between two segments, if there is one.
* There may be 0, 1 or many intersection points between two segments.
* If there are 0, null is returned. If there is 1 or more, a single one
* is returned (chosen at the discretion of the algorithm). If
* more information is required about the details of the intersection,
* the {@link RobustLineIntersector} class should be used.
*
* @param line
* @return an intersection point, or <code>null</code> if there is none
*/
Coordinate *
LineSegment::intersection(const LineSegment *line) const
{
LineIntersector *li = new RobustLineIntersector();
li->computeIntersection(p0, p1, line->p0, line->p1);
if (li->hasIntersection()) {
Coordinate *c=new Coordinate(li->getIntersection(0));
delete li;
return c;
}
delete li;
return NULL;
}
void object::test<3>()
{
LineIntersector i;
Coordinate p1(10, 10);
Coordinate p2(20, 10);
Coordinate q1(20, 10);
Coordinate q2(30, 10);
i.computeIntersection(p1, p2, q1, q2);
ensure_equals(i.getIntersectionNum(), (int)LineIntersector::POINT_INTERSECTION);
ensure_equals(i.getIntersectionNum(), 1);
ensure("!isProper", !i.isProper());
ensure("hasIntersection", i.hasIntersection());
}