mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-12 12:09:15 +00:00
96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
/* ResidualVM - A 3D game interpreter
|
|
*
|
|
* ResidualVM is the legal property of its developers, whose names
|
|
* are too numerous to list here. Please refer to the COPYRIGHT
|
|
* file distributed with this source distribution.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
*/
|
|
|
|
#include "math/line3d.h"
|
|
|
|
namespace Math {
|
|
|
|
Line3d::Line3d() {
|
|
}
|
|
|
|
Line3d::Line3d(const Vector3d &b, const Vector3d &e) :
|
|
_begin(b), _end(e) {
|
|
}
|
|
|
|
Line3d::Line3d(const Line3d &other) {
|
|
*this = other;
|
|
}
|
|
|
|
Math::Vector3d Line3d::begin() const {
|
|
return _begin;
|
|
}
|
|
|
|
Math::Vector3d Line3d::end() const {
|
|
return _end;
|
|
}
|
|
|
|
Math::Vector3d Line3d::middle() const {
|
|
return (_begin + _end) / 2.f;
|
|
}
|
|
|
|
bool Line3d::intersectLine2d(const Line3d &other, Math::Vector3d *pos, bool useXZ) {
|
|
float denom, nume_a, nume_b;
|
|
if (useXZ) {
|
|
denom = ((other._end.z() - other._begin.z()) * (_end.x() - _begin.x())) -
|
|
((other._end.x() - other._begin.x()) * (_end.z() - _begin.z()));
|
|
|
|
nume_a = ((other._end.x() - other._begin.x()) * (_begin.z() - other._begin.z())) -
|
|
((other._end.z() - other._begin.z()) * (_begin.x() - other._begin.x()));
|
|
|
|
nume_b = ((_end.x() - _begin.x()) * (_begin.z() - other._begin.z())) -
|
|
((_end.z() - _begin.z()) * (_begin.x() - other._begin.x()));
|
|
} else {
|
|
denom = ((other._end.y() - other._begin.y()) * (_end.x() - _begin.x())) -
|
|
((other._end.x() - other._begin.x()) * (_end.y() - _begin.y()));
|
|
|
|
nume_a = ((other._end.x() - other._begin.x()) * (_begin.y() - other._begin.y())) -
|
|
((other._end.y() - other._begin.y()) * (_begin.x() - other._begin.x()));
|
|
|
|
nume_b = ((_end.x() - _begin.x()) * (_begin.y() - other._begin.y())) -
|
|
((_end.y() - _begin.y()) * (_begin.x() - other._begin.x()));
|
|
}
|
|
|
|
if (denom == 0.0f) {
|
|
return false;
|
|
}
|
|
|
|
float ua = nume_a / denom;
|
|
float ub = nume_b / denom;
|
|
|
|
if (ua < 0 || ua > 1 || ub < 0 || ub > 1)
|
|
return false;
|
|
|
|
// Get the intersection point.
|
|
if (pos)
|
|
*pos = _begin + ua * (_end - _begin);
|
|
|
|
return true;
|
|
}
|
|
|
|
Line3d& Line3d::operator=(const Line3d &other) {
|
|
_begin = other._begin;
|
|
_end = other._end;
|
|
return *this;
|
|
}
|
|
|
|
}
|