Source/System/Window/Camera/OSGOrthographicCamera.cpp

   1 /*---------------------------------------------------------------------------*\
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   5  *               Copyright (C) 2000-2002 by the OpenSG Forum                 *
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  12 /*---------------------------------------------------------------------------*\
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  28 \*---------------------------------------------------------------------------*/
  29 /*---------------------------------------------------------------------------*\
  30  *                                Changes                                    *
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  37 \*---------------------------------------------------------------------------*/
  38
  39 //---------------------------------------------------------------------------
  40 //  Includes
  41 //---------------------------------------------------------------------------
  42
  43 #include <stdlib.h>
  44 #include <stdio.h>
  45
  46 #include "OSGConfig.h"
  47 #include "OSGMatrixUtility.h"
  48
  49 #include "OSGOrthographicCamera.h"
  50
  51 OSG_USING_NAMESPACE
  52
  53 /***************************************************************************\
  54  *                            Description                                  *
  55 \***************************************************************************/
  56
  57 /*! \class OSG::OrthographicCamera
  58 An orthographic camera.
  59 */
  60
  61 /***************************************************************************\
  62  *                           Class variables                               *
  63 \***************************************************************************/
  64
  65 /***************************************************************************\
  66  *                           Class methods                                 *
  67 \***************************************************************************/
  68
  69 void OrthographicCamera::initMethod(InitPhase ePhase)
  70 {
  71     Inherited::initMethod(ePhase);
  72 }
  73
  74
  75 /***************************************************************************\
  76  *                           Instance methods                              *
  77 \***************************************************************************/
  78
  79 /*-------------------------------------------------------------------------*\
  80  -  private                                                                 -
  81 \*-------------------------------------------------------------------------*/
  82
  83 /*----------------------- constructors & destructors ----------------------*/
  84
  85 OrthographicCamera::OrthographicCamera(void) :
  86     Inherited()
  87 {
  88 }
  89
  90 OrthographicCamera::OrthographicCamera(const OrthographicCamera &source) :
  91     Inherited(source)
  92 {
  93 }
  94
  95 OrthographicCamera::~OrthographicCamera(void)
  96 {
  97 }
  98
  99 /*----------------------------- class specific ----------------------------*/
 100
 101 void OrthographicCamera::changed(ConstFieldMaskArg whichField,
 102                                  UInt32            origin,
 103                                  BitVector         details)
 104 {
 105     Inherited::changed(whichField, origin, details);
 106 }
 107
 108 /*-------------------------- your_category---------------------------------*/
 109
 110 void OrthographicCamera::getProjection(Matrix &result,
 111                                        UInt32  width,
 112                                        UInt32  height)
 113 {
 114     Real32 vs = getVerticalSize  () / 2;
 115     Real32 hs = getHorizontalSize() / 2;
 116
 117     // catch some illegal cases
 118     if(((vs <= 0) && (hs <= 0)) || width == 0 || height == 0)
 119     {
 120         result.setIdentity();
 121         return;
 122     }
 123
 124     Real32 winAspect = width / Real32(height) * getAspect();
 125     if (vs <= 0)
 126     {
 127         vs = hs / winAspect;
 128     }
 129     else if (hs <= 0)
 130     {
 131         hs = vs * winAspect;
 132     }
 133     else
 134     {
 135         Real32 camAspect = hs / vs;
 136
 137         if (winAspect < camAspect)
 138         {
 139             vs = hs / winAspect;
 140         }
 141         else
 142         {
 143             hs = vs * winAspect;
 144         }
 145     }
 146
 147     MatrixOrthogonal(result, -hs, hs,
 148                              -vs, vs,
 149                              getNear(), getFar());
 150 }
 151
 152
 153 void OrthographicCamera::dump(      UInt32    ,
 154                          const BitVector ) const
 155 {
 156     SLOG << "Dump OrthographicCamera NI" << std::endl;
 157 }
 158
 159