vcglib/wrap/gui/frustum.h

143 lines
4.6 KiB
C++

/****************************************************************************
* VCGLib o o *
* Visual and Computer Graphics Library o o *
* _ O _ *
* Copyright(C) 2004 \/)\/ *
* Visual Computing Lab /\/| *
* ISTI - Italian National Research Council | *
* \ *
* All rights reserved. *
* *
* 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 (http://www.gnu.org/licenses/gpl.txt) *
* for more details. *
* *
****************************************************************************/
/****************************************************************************
History
$Log: not supported by cvs2svn $
Revision 1.5 2004/09/28 10:23:28 ponchio
Various generic changes.
Revision 1.4 2004/05/12 20:55:18 ponchio
*** empty log message ***
Revision 1.3 2004/03/31 15:06:41 ponchio
#include <camera> -> #include <view>
Revision 1.2 2004/03/25 14:55:25 ponchio
Adding copyright.
****************************************************************************/
#ifndef FRUSTUM_H
#define FRUSTUM_H
#include <wrap/gui/view.h>
#include <vcg/space/plane3.h>
#include <vcg/space/line3.h>
#include <iostream>
using namespace std;
namespace vcg {
template <class T> class Frustum: public View<T> {
public:
void GetView();
Point3<T> ViewPoint();
T Resolution(float dist = 1);
bool IsOutside(Point3<T> &point);
bool IsOutside(Point3<T> &point, T radius);
T Distance(Point3<T> &point, int plane);
protected:
T resolution;
Plane3<T> planes[6];
Point3<T> view_point;
};
typedef Frustum<float> Frustumf;
typedef Frustum<double> Frustumd;
//Implementation
template <class T> Point3<T> Frustum<T>::ViewPoint() {
return view_point;
}
template <class T> T Frustum<T>::Resolution(float dist) {
return resolution * dist;
}
template <class T> bool Frustum<T>::IsOutside(Point3<T> &point) {
Point3<T> r = Project(point);
if(r[0] < viewport[0] || r[0] > viewport[0]+viewport[2] ||
r[1] < viewport[1] || r[1] > viewport[1]+viewport[3])
return true;
return false;
}
template <class T> bool Frustum<T>::IsOutside(Point3<T> &point, T radius) {
for(int i = 0; i < 4; i++) {
T dist = Distance(point, i);
if(dist < -radius)
return true;
}
return false;
}
template <class T> T Frustum<T>::Distance(Point3<T> &point, int plane) {
return vcg::Distance(planes[plane], point);
}
template <class T> void Frustum<T>::GetView() {
View<T>::GetView();
int t = viewport[1] + viewport[3];
int b = viewport[1];
int r = viewport[0] + viewport[2];
int l = viewport[0];
Point3<T> nw = UnProject(Point3<T>(l, b, 0));
Point3<T> sw = UnProject(Point3<T>(l, t, 0));
Point3<T> ne = UnProject(Point3<T>(r, b, 0));
Point3<T> se = UnProject(Point3<T>(r, t, 0));
Point3<T> NW = UnProject(Point3<T>(l, b, 1));
Point3<T> SW = UnProject(Point3<T>(l, t, 1));
Point3<T> NE = UnProject(Point3<T>(r, b, 1));
Point3<T> SE = UnProject(Point3<T>(r, t, 1));
view_point = View<T>::ViewPoint();
planes[0].Init(nw, NW, NE);
planes[1].Init(ne, NE, SE);
planes[2].Init(se, SE, SW);
planes[3].Init(sw, SW, NW);
planes[4].Init(se, sw, nw);
planes[5].Init(SW, SE, NE);
//compute resolution: sizeo of a pixel unitary distance from view_point
resolution = ((ne + NE) - (nw + NW)).Norm() /
(viewport[2] * ((ne + NE) - view_point).Norm());
}
}//namespace
#endif