mirror of https://github.com/CGAL/cgal
151 lines
4.6 KiB
C
151 lines
4.6 KiB
C
// Copyright (c) 1997 Utrecht University (The Netherlands),
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// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
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// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
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// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
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// and Tel-Aviv University (Israel). All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org); you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; version 2.1 of the License.
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// See the file LICENSE.LGPL distributed with CGAL.
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//
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// Licensees holding a valid commercial license may use this file in
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// accordance with the commercial license agreement provided with the software.
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//
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// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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//
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// $URL$
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// $Id$
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//
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//
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// Author(s) : Geert-Jan Giezeman <geert@cs.uu.nl>
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#include <CGAL/Simple_cartesian.h>
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#include <CGAL/Point_3.h>
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#include <CGAL/bbox_intersection_3.h>
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CGAL_BEGIN_NAMESPACE
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Object
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intersection_bl(const Bbox_3 &box,
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double lpx, double lpy, double lpz,
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double ldx, double ldy, double ldz,
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bool min_infinite, bool max_infinite)
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{
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typedef Simple_cartesian<double> R_cd;
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Point_3<R_cd> ref_point(lpx,lpy, lpz);
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Vector_3<R_cd> dir(ldx, ldy, ldz);
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double seg_min = 0.0, seg_max = 1.0;
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// first on x value
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if (dir.x() == 0.0) {
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if (ref_point.x() < box.xmin())
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return Object();
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if (ref_point.x() > box.xmax())
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return Object();
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} else {
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double newmin, newmax;
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if (dir.x() > 0.0) {
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newmin = (box.xmin()-ref_point.x())/dir.x();
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newmax = (box.xmax()-ref_point.x())/dir.x();
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} else {
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newmin = (box.xmax()-ref_point.x())/dir.x();
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newmax = (box.xmin()-ref_point.x())/dir.x();
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}
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if (min_infinite) {
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min_infinite = false;
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seg_min = newmin;
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} else {
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if (newmin > seg_min)
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seg_min = newmin;
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}
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if (max_infinite) {
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max_infinite = false;
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seg_max = newmax;
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} else {
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if (newmax < seg_max)
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seg_max = newmax;
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}
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if (seg_max < seg_min)
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return Object();
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}
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// now on y value
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if (dir.y() == 0.0) {
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if (ref_point.y() < box.ymin())
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return Object();
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if (ref_point.y() > box.ymax())
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return Object();
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} else {
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double newmin, newmax;
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if (dir.y() > 0.0) {
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newmin = (box.ymin()-ref_point.y())/dir.y();
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newmax = (box.ymax()-ref_point.y())/dir.y();
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} else {
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newmin = (box.ymax()-ref_point.y())/dir.y();
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newmax = (box.ymin()-ref_point.y())/dir.y();
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}
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if (min_infinite) {
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min_infinite = false;
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seg_min = newmin;
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} else {
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if (newmin > seg_min)
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seg_min = newmin;
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}
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if (max_infinite) {
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max_infinite = false;
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seg_max = newmax;
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} else {
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if (newmax < seg_max)
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seg_max = newmax;
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}
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if (seg_max < seg_min)
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return Object();
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}
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// now on z value
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if (dir.z() == 0.0) {
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if (ref_point.z() < box.zmin())
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return Object();
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if (ref_point.z() > box.zmax())
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return Object();
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} else {
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double newmin, newmax;
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if (dir.z() > 0.0) {
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newmin = (box.zmin()-ref_point.z())/dir.z();
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newmax = (box.zmax()-ref_point.z())/dir.z();
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} else {
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newmin = (box.zmax()-ref_point.z())/dir.z();
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newmax = (box.zmin()-ref_point.z())/dir.z();
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}
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if (min_infinite) {
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min_infinite = false;
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seg_min = newmin;
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} else {
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if (newmin > seg_min)
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seg_min = newmin;
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}
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if (max_infinite) {
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max_infinite = false;
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seg_max = newmax;
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} else {
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if (newmax < seg_max)
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seg_max = newmax;
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}
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if (seg_max < seg_min)
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return Object();
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}
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if (min_infinite || max_infinite) {
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seg_max = 0.0;
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CGAL_kernel_assertion_msg(true,
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"Zero direction vector of line detected.");
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}
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if (seg_max == seg_min)
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return make_object(ref_point + dir*seg_max);
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return make_object(Segment_3<R_cd>(
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ref_point + dir*seg_min, ref_point + dir*seg_max));
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}
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CGAL_END_NAMESPACE
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