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Tina5/tina-libs/tina/geometry/geomCurve_con_rect.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 Lesser 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 Lesser General Public License for more details.
 14  *
 15  * You should have received a copy of the GNU Lesser 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  **********
 20  * 
 21  * Program :    TINA
 22  * File    :  $Source: /home/tina/cvs/tina-libs/tina/geometry/geomCurve_con_rect.c,v $
 23  * Date    :  $Date: 2008/12/07 04:33:58 $
 24  * Version :  $Revision: 1.2 $
 25  * CVS Id  :  $Id: geomCurve_con_rect.c,v 1.2 2008/12/07 04:33:58 paul Exp $
 26  *
 27  * Author  : Legacy TINA
 28  *
 29  * Notes : projective transformation of conic
 30  *
 31  *********
 32 */
 33 
 34 #include "geomCurve_con_rect.h"
 35 
 36 #if HAVE_CONFIG_H
 37   #include <config.h>
 38 #endif
 39 
 40 
 41 #include <stdio.h>
 42 #include <math.h>
 43 #include <tina/sys/sysDef.h>
 44 #include <tina/sys/sysPro.h>
 45 #include <tina/math/mathDef.h>
 46 #include <tina/math/mathPro.h>
 47 #include <tina/geometry/geom_CurveDef.h>
 48 #include <tina/geometry/geomCurve_conic.h>
 49 #include <tina/geometry/geomCurve_con_util.h>
 50 
 51 
 52 Conic  *conic_rectify(Conic * conic, Mat3 rect)
 53 {
 54     Mat3    m = {Mat3_id};
 55     Mat3    irect = {Mat3_id};
 56     Vec2    p1 = {Vec2_id};
 57     Vec2    pmid = {Vec2_id};
 58     Vec2    p2 = {Vec2_id};
 59     Conic  *new = conic_alloc(0);
 60 
 61     irect = mat3_inverse(rect);
 62 
 63     /** transform homogeneous matrix for conic with irect **/
 64     m = mat3(conic->a, conic->b, conic->d,
 65              conic->b, conic->c, conic->e,
 66              conic->d, conic->e, conic->f);
 67     m = mat3_prod(m, irect);
 68     m = mat3_prod(mat3_transpose(irect), m);
 69     new->a = mat3_xx(m);
 70     new->b = mat3_xy(m);
 71     new->c = mat3_yy(m);
 72     new->d = mat3_xz(m);
 73     new->e = mat3_yz(m);
 74     new->f = mat3_zz(m);
 75 
 76     /** transform 3 points on conic **/
 77     p1 = conic_point(conic, conic->t1);
 78     p1 = vec2_rectify(rect, p1);
 79     pmid = conic_point(conic, 0.5 * (conic->t1 + conic->t2));
 80     pmid = vec2_rectify(rect, pmid);
 81     p2 = conic_point(conic, conic->t2);
 82     p2 = vec2_rectify(rect, p2);
 83 
 84     /** make new conic consistent **/
 85     conic_setup(new);
 86     conic_set_ends(new, p1, p2, pmid);
 87 
 88     return (new);
 89 }
 90 
 91 Conic  *conic_proj(Conic * conic, Mat3 proj)
 92 {
 93     Mat3    m = {Mat3_id};
 94     Mat3    iproj = {Mat3_id};
 95     Vec2    p1 = {Vec2_id};
 96     Vec2    pmid = {Vec2_id};
 97     Vec2    p2 = {Vec2_id};
 98     Conic  *new = conic_alloc(0);
 99 
100     iproj = mat3_inverse(proj);
101 
102     /** transform homogeneous matrix for conic with iproj **/
103     m = mat3(conic->a, conic->b, conic->d,
104              conic->b, conic->c, conic->e,
105              conic->d, conic->e, conic->f);
106     m = mat3_prod(m, iproj);
107     m = mat3_prod(mat3_transpose(iproj), m);
108     new->a = mat3_xx(m);
109     new->b = mat3_xy(m);
110     new->c = mat3_yy(m);
111     new->d = mat3_xz(m);
112     new->e = mat3_yz(m);
113     new->f = mat3_zz(m);
114 
115     /** transform 3 points on conic **/
116     p1 = conic_point(conic, conic->t1);
117     p1 = vec2_rectify(proj, p1);
118     pmid = conic_point(conic, 0.5 * (conic->t1 + conic->t2));
119     pmid = vec2_rectify(proj, pmid);
120     p2 = conic_point(conic, conic->t2);
121     p2 = vec2_rectify(proj, p2);
122 
123     /** make new conic consistent **/
124     conic_setup(new);
125     conic_set_ends(new, p1, p2, pmid);
126 
127     return (new);
128 }
129 

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