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86 lines
2.1 KiB
C++
86 lines
2.1 KiB
C++
/* Residual - A 3D game interpreter
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*
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* Residual is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*
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* $URL$
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* $Id$
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*/
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#include "graphics/line3d.h"
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namespace Graphics {
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Line3d::Line3d() {
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}
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Line3d::Line3d(const Vector3d &b, const Vector3d &e) :
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_begin(b), _end(e) {
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}
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Line3d::Line3d(const Line3d &other) {
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*this = other;
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}
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Graphics::Vector3d Line3d::begin() const {
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return _begin;
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}
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Graphics::Vector3d Line3d::end() const {
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return _end;
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}
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Graphics::Vector3d Line3d::middle() const {
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return (_begin + _end) / 2.f;
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}
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bool Line3d::intersectLine2d(const Line3d &other, Graphics::Vector3d *pos) {
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float denom = ((other._end.y() - other._begin.y()) * (_end.x() - _begin.x())) -
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((other._end.x() - other._begin.x()) * (_end.y() - _begin.y()));
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float nume_a = ((other._end.x() - other._begin.x()) * (_begin.y() - other._begin.y())) -
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((other._end.y() - other._begin.y()) * (_begin.x() - other._begin.x()));
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if (denom == 0.0f) {
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return false;
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}
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float ua = nume_a / denom;
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if (ua < 0)
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ua = 0;
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if (ua > 1)
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ua = 1;
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// Get the intersection point.
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if (pos)
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*pos = _begin + ua * (_end - _begin);
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return true;
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}
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void Line3d::operator=(const Line3d &other) {
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_begin = other._begin;
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_end = other._end;
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}
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}
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