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#include "glt_project.h"
/*! \file
\ingroup GLT
$Id: project.cpp,v 1.9 2002/10/09 15:09:38 nigels Exp $
$Log: project.cpp,v $
Revision 1.9 2002/10/09 15:09:38 nigels
Added RCS Id and Log tags
*/
#include <cassert>
#include <iosfwd>
using namespace std;
GltOrtho::GltOrtho()
: _left(-1.0), _right(1.0), _bottom(-1.0), _top(1.0), _zNear(-10.0), _zFar(10.0)
{
}
GltOrtho::~GltOrtho()
{
}
void
GltOrtho::set()
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(_left,_right,_bottom,_top,_zNear,_zFar);
glMatrixMode(GL_MODELVIEW);
}
void
GltOrtho::set(int width,int height)
{
GLdouble x = 1.0;
GLdouble y = 1.0;
if (width!=0 && height!=0)
{
if (width>height)
x = GLdouble(width)/GLdouble(height);
else
y = GLdouble(height)/GLdouble(width);
}
_left = -x;
_right = x;
_bottom = -y;
_top = y;
set();
}
GLdouble &GltOrtho::left() { return _left; }
GLdouble &GltOrtho::right() { return _right; }
GLdouble &GltOrtho::bottom() { return _bottom; }
GLdouble &GltOrtho::top() { return _top; }
GLdouble &GltOrtho::zNear() { return _zNear; }
GLdouble &GltOrtho::zFar() { return _zFar; }
const GLdouble &GltOrtho::left() const { return _left; }
const GLdouble &GltOrtho::right() const { return _right; }
const GLdouble &GltOrtho::bottom() const { return _bottom; }
const GLdouble &GltOrtho::top() const { return _top; }
const GLdouble &GltOrtho::zNear() const { return _zNear; }
const GLdouble &GltOrtho::zFar() const { return _zFar; }
bool
GltOrtho::tile(GltOrtho &frust,const int dx,const int dy,const int n) const
{
if (dx<1 || dy<1 || n<0 || n>=dx*dy)
{
frust = *this;
return false;
}
const int px = n%dx;
const int py = n/dx;
const GLdouble width = (_right-_left)/dx;
const GLdouble height = (_top-_bottom)/dy;
assert(py<=dy);
if (py<dy)
{
frust._left = frust._right = _left + width*px;
frust._top = frust._bottom = _bottom + height*py;
frust._right += width;
frust._top += height;
frust._zNear = _zNear;
frust._zFar = _zFar;
return true;
}
else
return false;
}
///////////////////////////
GltFrustum::GltFrustum()
: _left(-1.0), _right(1.0), _bottom(-1.0), _top(1.0), _zNear(1.0), _zFar(10.0)
{
}
GltFrustum::~GltFrustum()
{
}
void
GltFrustum::set()
{
assert(_zNear>0.0);
assert(_zFar>0.0);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glFrustum(_left,_right,_bottom,_top,_zNear,_zFar);
glMatrixMode(GL_MODELVIEW);
}
void
GltFrustum::set(int width,int height)
{
GLdouble x = 1.0;
GLdouble y = 1.0;
if (width!=0 && height!=0)
{
if (width>height)
x = GLdouble(width)/GLdouble(height);
else
y = GLdouble(height)/GLdouble(width);
}
_left = -x;
_right = x;
_bottom = -y;
_top = y;
set();
}
GLdouble &GltFrustum::left() { return _left; }
GLdouble &GltFrustum::right() { return _right; }
GLdouble &GltFrustum::bottom() { return _bottom; }
GLdouble &GltFrustum::top() { return _top; }
GLdouble &GltFrustum::zNear() { return _zNear; }
GLdouble &GltFrustum::zFar() { return _zFar; }
const GLdouble &GltFrustum::left() const { return _left; }
const GLdouble &GltFrustum::right() const { return _right; }
const GLdouble &GltFrustum::bottom() const { return _bottom; }
const GLdouble &GltFrustum::top() const { return _top; }
const GLdouble &GltFrustum::zNear() const { return _zNear; }
const GLdouble &GltFrustum::zFar() const { return _zFar; }
bool
GltFrustum::tile(GltFrustum &frust,const int dx,const int dy,const int n) const
{
if (dx<1 || dy<1 || n<0 || n>=dx*dy)
{
frust = *this;
return false;
}
const int px = n%dx;
const int py = n/dx;
const GLdouble width = (_right-_left)/dx;
const GLdouble height = (_top-_bottom)/dy;
assert(py<=dy);
if (py<dy)
{
frust._left = frust._right = _left + width*px;
frust._top = frust._bottom = _bottom + height*py;
frust._right += width;
frust._top += height;
frust._zNear = _zNear;
frust._zFar = _zFar;
return true;
}
else
return false;
}
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