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//
// Filename : Polygon.h
// Author(s) : Stephane Grabli
// Purpose : Class to define a polygon
// Date of creation : 30/07/2002
//
///////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) : 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef POLYGON_H
# define POLYGON_H
# include <vector>
# include "Geom.h"
# include "GeomUtils.h"
using namespace std;
namespace Geometry {
template <class Point>
class Polygon
{
public:
inline Polygon() {
_id = 0;
userdata = 0;
userdata2 = 0;
}
inline Polygon(const vector<Point>& vertices) {
_vertices = vertices;
computeBBox();
_id = 0;
userdata = 0;
userdata2 = 0;
}
inline Polygon(const Polygon<Point>& poly) {
Point p;
for(typename vector<Point>::const_iterator it = poly.getVertices().begin();
it != poly.getVertices().end();
it++) {
p = *it;
_vertices.push_back(p);
}
_id = poly.getId();
poly.getBBox(_min, _max);
userdata = 0;
userdata2 = 0;
}
virtual ~Polygon() {}
//
// Accessors
//
/////////////////////////////////////////////////////////////////////////////
inline const vector<Point>& getVertices() const {
return _vertices;
}
inline void getBBox(Point& min, Point& max) const {
min = _min;
max = _max;
}
inline Point& getBBoxCenter()
{
Point result;
result = (_min + _max) / 2;
return result;
}
inline Point& getCenter() {
Point result;
for (typename vector<Point>::iterator it = _vertices.begin();
it != _vertices.end();
it++)
result += *it;
result /= _vertices.size();
return result;
}
inline unsigned getId() const {
return _id;
}
//
// Modifiers
//
/////////////////////////////////////////////////////////////////////////////
inline void setVertices(const vector<Point>& vertices) {
_vertices.clear();
Point p;
for (typename vector<Point>::const_iterator it = vertices.begin();
it != vertices.end();
it++) {
p = *it;
_vertices.push_back(p);
}
computeBBox();
}
inline void setId(unsigned id) {
_id = id;
}
//
// Other methods
//
/////////////////////////////////////////////////////////////////////////////
inline void computeBBox() {
if(_vertices.empty())
return;
_max = _vertices[0];
_min = _vertices[0];
for(typename vector<Point>::iterator it = _vertices.begin();
it != _vertices.end();
it++) {
for(unsigned i = 0; i < Point::dim(); i++) {
if((*it)[i] > _max[i])
_max[i] = (*it)[i];
if((*it)[i] < _min[i])
_min[i] = (*it)[i];
}
}
}
// FIXME Is it possible to get rid of userdatas ?
void* userdata;
void* userdata2; // Used during ray casting
protected:
vector<Point> _vertices;
Point _min;
Point _max;
unsigned _id;
};
//
// Polygon3r class
//
///////////////////////////////////////////////////////////////////////////////
class Polygon3r : public Polygon<Vec3r>
{
public:
inline Polygon3r() : Polygon<Vec3r>() {}
inline Polygon3r(const vector<Vec3r>& vertices,
const Vec3r& normal) : Polygon<Vec3r>(vertices) {
setNormal(normal);
}
inline Polygon3r(const Polygon3r& poly) : Polygon<Vec3r>(poly) {}
virtual ~Polygon3r() {}
void setNormal(const Vec3r& normal) {
_normal = normal;
}
Vec3r getNormal() const {
return _normal;
}
/*! Check whether the Polygon intersects with the ray or not */
inline bool rayIntersect(Vec3r& orig, Vec3r& dir,
real& t, real& u, real& v, real epsilon = M_EPSILON) {
// if (_vertices.size() < 3)
// return false;
return GeomUtils::intersectRayTriangle(orig, dir,
_vertices[0], _vertices[1], _vertices[2],
t, u, v, epsilon);
}
private:
Vec3r _normal;
};
} // end of namespace Geometry
#endif // POLYGON_H
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