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Tina6/tina-libs/tina/geometry/geomCam_aim.c

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  1 /**********
  2  * 
  3  * This file is part of the TINA Open Source Image Analysis Environment
  4  * henceforth known as TINA
  5  *
  6  * TINA is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License as 
  8  * published by the Free Software Foundation.
  9  *
 10  * TINA is distributed in the hope that it will be useful,
 11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 13  * GNU General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU General Public License
 16  * along with TINA; if not, write to the Free Software Foundation, Inc., 
 17  * 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 18  *
 19  * ANY users of TINA who require exemption from the existing licence must
 20  * negotiate a new licence with Dr. Neil.A.Thacker, the sole agent for
 21  * the University of Manchester.
 22  *
 23  **********
 24  * 
 25  * Program :    TINA
 26  * File    :  $Source: /home/tina/cvs/tina-libs/tina/geometry/geomCam_aim.c,v $
 27  * Date    :  $Date: 2002/12/09 11:51:23 $
 28  * Version :  $Revision: 1.1.1.1 $
 29  * CVS Id  :  $Id: geomCam_aim.c,v 1.1.1.1 2002/12/09 11:51:23 cvstina Exp $
 30  *
 31  * Author  : Legacy TINA
 32  *
 33  * Notes : general camera functions
 34  *
 35  *********
 36 */
 37 
 38 #include "geomCam_aim.h"
 39 
 40 #if HAVE_CONFIG_H
 41   #include <config.h>
 42 #endif
 43 
 44 #include <math.h>
 45 #include <tina/sys/sysDef.h>
 46 #include <tina/sys/sysPro.h>
 47 #include <tina/math/mathDef.h>
 48 #include <tina/math/mathPro.h>
 49 #include <tina/geometry/geomCam_gen.h>
 50 #include <tina/geometry/geom_CamDef.h>
 51 
 52 /**
 53 transformation to the coordinate system standing
 54 at point p,
 55 z-axis along aim
 56 y-axis in plane of aim and down
 57 **/
 58 
 59 Transform3 trans3_from_aim(Vec3 p, Vec3 aim, Vec3 down)
 60 {
 61     Vec3    ex = {Vec3_id};
 62     Vec3    ey = {Vec3_id};
 63     Vec3    ez = {Vec3_id};
 64 
 65     vec3_basis(aim, down, &ex, &ey, &ez);
 66     return (trans3_to_frame(p, ex, ey, ez));
 67 }
 68 
 69 /**
 70 camera with position and orientation specified as above
 71 
 72 Note:
 73 
 74 get simplest camera model
 75     type = 0
 76     f = ax = ay = 1.0;
 77     width = height = 1;
 78     cx = cy = 0.0;
 79     pix = 1.0;
 80 
 81 can get more realistic, centred camera with given field of view using
 82     type = 0
 83     f = ax = ay = 1.0;
 84     width = height (e.g. 256.0 or 512.0)
 85     cx = cy = width/2.0
 86     pix = (2.0/width)*tan(theta*DEGREE/2.0) (theta = field of view in degrees)
 87 
 88 standard Tina camera has position and orientation
 89     p = vec3_zero()
 90     aim = vec3_ez()
 91     down = vec3_ey()
 92 **/
 93 
 94 Camera *cam_from_aim(unsigned int type, Vec3 p, Vec3 aim, Vec3 down, double f, double pix, double ax, double ay, double cx, double cy, int width, int height)
 95 {
 96     Transform3 transf = {Transform3_id};
 97 
 98     transf = trans3_from_aim(p, aim, down);
 99 
100     return (cam_make(type, &transf, f, pix, ax, ay, cx, cy, width, height));
101 }
102 

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