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Tina6/tina-libs/tina/math/mathTran_rot2.c

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  1 /**********
  2  *
  3  * Copyright (c) 2003, Division of Imaging Science and Biomedical Engineering,
  4  * University of Manchester, UK.  All rights reserved.
  5  * 
  6  * Redistribution and use in source and binary forms, with or without modification, 
  7  * are permitted provided that the following conditions are met:
  8  * 
  9  *   . Redistributions of source code must retain the above copyright notice, 
 10  *     this list of conditions and the following disclaimer.
 11  *    
 12  *   . Redistributions in binary form must reproduce the above copyright notice,
 13  *     this list of conditions and the following disclaimer in the documentation 
 14  *     and/or other materials provided with the distribution.
 15  * 
 16  *   . Neither the name of the University of Manchester nor the names of its
 17  *     contributors may be used to endorse or promote products derived from this 
 18  *     software without specific prior written permission.
 19  * 
 20  * 
 21  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 
 22  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 
 23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 
 24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE 
 25  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
 26  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 
 27  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 28  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 
 29  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 
 30  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
 31  * POSSIBILITY OF SUCH DAMAGE.
 32  *
 33  **********
 34  *
 35  * Program :    TINA
 36  * File    :  $Source: /home/tina/cvs/tina-libs/tina/math/mathTran_rot2.c,v $
 37  * Date    :  $Date: 2003/09/23 11:32:20 $
 38  * Version :  $Revision: 1.4 $
 39  * CVS Id  :  $Id: mathTran_rot2.c,v 1.4 2003/09/23 11:32:20 matts Exp $
 40  *
 41  * Author  :  Legacy TINA
 42  *
 43  * Notes : Rotation
 44  *
 45  *********
 46 */
 47 /** 
 48  *  @file
 49  *  @brief  Rotation functions for a Mat2.      
 50  *
 51  *
 52  * 
 53 */
 54 
 55 #include "mathTran_rot2.h"
 56 
 57 #if HAVE_CONFIG_H
 58 #include <config.h>
 59 #endif
 60 
 61 #include <stdio.h>
 62 #include <math.h>
 63 #include <tina/math/math_GeomDef.h>
 64 #include <tina/math/math_GeomPro.h>
 65 
 66 Mat2            rot2(double theta)
 67 {
 68         double          c = cos(theta);
 69         double          s = sin(theta);
 70 
 71         return (mat2(c, -s,
 72                      s, c));
 73 }
 74 
 75 double          rot2_angle(Mat2 m)
 76 {
 77         return (atan2(mat2_yx(m), mat2_xx(m)));
 78 }
 79 
 80 /* APA 2/2/94 */
 81 
 82 Mat2            rot2_with_scale(double theta, double scale_factor)
 83 {
 84         double          c = cos(theta) * scale_factor;
 85         double          s = sin(theta) * scale_factor;
 86         return (mat2(c, -s, s, c));
 87 }
 88 

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