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/***********************************************************************
* perspective.h: Data concerning the point of view. It is defined by
* three coordinates: the location of the observer
* ('from'), the point she is looking at ('center' or
* 'at') and a vector indicating which side is at the top
* of his view ('up').
* It also contains any extra data necessary to make
* calculation of a point's projection faster.
**********************************************************************/
/***********************************************************************
* This file is part of SpaceChart.
* Copyright (C) 1999 Miguel Coca <e970095@zipi.fi.upm.es>
*
* 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 _INCLUDE_PERSPECTIVE_H_
#define _INCLUDE_PERSPECTIVE_H_
#include "starmap.h"
typedef struct st_perspective perspective_t;
perspective_t* perspective_new( coords_3d_t* from, coords_3d_t* center,
coords_3d_t* up );
void perspective_get_from( perspective_t *persp, coords_3d_t* from );
void perspective_get_up( perspective_t *persp, coords_3d_t* up );
void perspective_get_center( perspective_t *persp, coords_3d_t* center );
/* Rotate the perspective v_ang radians in the vertical and h_ang radians
* in the horizontal. */
void perspective_rotate( perspective_t *persp, double v_ang, double h_ang );
/* Set the coordinates given as the new center of the perspective system,
* keeping the current orientation of the view. */
void perspective_change_center(perspective_t *persp, coords_3d_t* new_center);
/* Move the center distance parsecs in the given direction, keeping the
* orientation of the view. */
void perspective_move_center( perspective_t *persp, coords_3d_t* direction,
double distance );
/* Calculate the projection of the given point in 2D. The results are given
* in the [-1..1] range. */
void perspective_compute( perspective_t* persp,
coords_3d_t* star_coords,
double* x, double* y );
void perspective_destroy( perspective_t* persp );
#endif
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