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/* Libvisual-plugins - Standard plugins for libvisual
*
* Copyright (C) 2000, 2001 Remi Arquier <arquier@crans.org>
*
* Authors: Remi Arquier <arquier@crans.org>
* Dennis Smit <ds@nerds-incorporated.org>
*
* $Id: projection.c,v 1.3 2005/12/20 18:49:12 synap Exp $
*
* 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
*/
#include <math.h>
void rotation_3d (float *x, float *y, float *z, float alpha, float beta,
float gamma)
{
float nx, ny;
float cosga = cos (gamma), singa = sin (gamma), cosal = cos (alpha), sinal =
sin (alpha);
nx = cosga * *x - singa * *y;
ny = cosal * (singa * *x + cosga * *y) - sinal * *z;
*z = sinal * (singa * *x + cosga * *y) + cosal * *z;
*x = nx;
*y = ny;
}
void perspective (float *x, float *y, float *z, int persp, int dist_cam)
{
float foc_cam = 100,aux;
aux = (foc_cam + persp) / (dist_cam + persp - *z);
*x = *x * aux;
*y = *y * aux;
}
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