svx/source/engine3d/camera3d.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
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   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #include <svx/camera3d.hxx>
  21 #include <tools/stream.hxx>
  22
  23 Camera3D::Camera3D(const basegfx::B3DPoint& rPos, const basegfx::B3DPoint& rLookAt,
  24                    double fFocalLen, double fBankAng) :
  25     aResetPos(rPos),
  26     aResetLookAt(rLookAt),
  27     fResetFocalLength(fFocalLen),
  28     fResetBankAngle(fBankAng),
  29     fBankAngle(fBankAng),
  30     bAutoAdjustProjection(true)
  31 {
  32     SetVPD(0);
  33     SetPosition(rPos);
  34     SetLookAt(rLookAt);
  35     SetFocalLength(fFocalLen);
  36 }
  37
  38 Camera3D::Camera3D()
  39     : aResetPos(0.0, 0.0, 1.0)
  40     , fResetFocalLength(0.0)
  41     , fResetBankAngle(0.0)
  42     , fFocalLength(35.0)
  43     , fBankAngle(0.0)
  44     , bAutoAdjustProjection(false)
  45 {
  46 }
  47
  48 // Set default values for reset
  49
  50 void Camera3D::SetDefaults(const basegfx::B3DPoint& rPos, const basegfx::B3DPoint& rLookAt,
  51                             double fFocalLen, double fBankAng)
  52 {
  53     aResetPos           = rPos;
  54     aResetLookAt        = rLookAt;
  55     fResetFocalLength   = fFocalLen;
  56     fResetBankAngle     = fBankAng;
  57 }
  58
  59 // Set ViewWindow and adjust PRP
  60
  61 void Camera3D::SetViewWindow(double fX, double fY, double fW, double fH)
  62 {
  63     Viewport3D::SetViewWindow(fX, fY, fW, fH);
  64     if ( bAutoAdjustProjection )
  65         SetFocalLength(fFocalLength);
  66 }
  67
  68 void Camera3D::SetPosition(const basegfx::B3DPoint& rNewPos)
  69 {
  70     if ( rNewPos != aPosition )
  71     {
  72         aPosition = rNewPos;
  73         SetVRP(aPosition);
  74         SetVPN(aPosition - aLookAt);
  75         SetBankAngle(fBankAngle);
  76     }
  77 }
  78
  79 void Camera3D::SetLookAt(const basegfx::B3DPoint& rNewLookAt)
  80 {
  81     if ( rNewLookAt != aLookAt )
  82     {
  83         aLookAt = rNewLookAt;
  84         SetVPN(aPosition - aLookAt);
  85         SetBankAngle(fBankAngle);
  86     }
  87 }
  88
  89 void Camera3D::SetPosAndLookAt(const basegfx::B3DPoint& rNewPos,
  90                                const basegfx::B3DPoint& rNewLookAt)
  91 {
  92     if ( rNewPos != aPosition || rNewLookAt != aLookAt )
  93     {
  94         aPosition = rNewPos;
  95         aLookAt = rNewLookAt;
  96
  97         SetVRP(aPosition);
  98         SetVPN(aPosition - aLookAt);
  99         SetBankAngle(fBankAngle);
 100     }
 101 }
 102
 103 void Camera3D::SetBankAngle(double fAngle)
 104 {
 105     basegfx::B3DVector aDiff(aPosition - aLookAt);
 106     basegfx::B3DVector aPrj(aDiff);
 107     fBankAngle = fAngle;
 108
 109     if ( aDiff.getY() == 0 )
 110     {
 111         aPrj.setY(-1.0);
 112     }
 113     else
 114     {   // aPrj = Projection from aDiff on the XZ-plane
 115         aPrj.setY(0.0);
 116
 117         if ( aDiff.getY() < 0.0 )
 118         {
 119             aPrj = -aPrj;
 120         }
 121     }
 122
 123     // Calculate from aDiff to uppwards pointing View-Up-Vector
 124     // duplicated line is intentional!
 125     aPrj = aPrj.getPerpendicular(aDiff);
 126     aPrj = aPrj.getPerpendicular(aDiff);
 127     aDiff.normalize();
 128
 129     // Rotate on Z axis, to rotate the BankAngle and back
 130     basegfx::B3DHomMatrix aTf;
 131     const double fV(sqrt(aDiff.getY() * aDiff.getY() + aDiff.getZ() * aDiff.getZ()));
 132
 133     if ( fV != 0.0 )
 134     {
 135         basegfx::B3DHomMatrix aTemp;
 136         const double fSin(aDiff.getY() / fV);
 137         const double fCos(aDiff.getZ() / fV);
 138
 139         aTemp.set(1, 1, fCos);
 140         aTemp.set(2, 2, fCos);
 141         aTemp.set(2, 1, fSin);
 142         aTemp.set(1, 2, -fSin);
 143
 144         aTf *= aTemp;
 145     }
 146
 147     {
 148         basegfx::B3DHomMatrix aTemp;
 149         const double fSin(-aDiff.getX());
 150         const double fCos(fV);
 151
 152         aTemp.set(0, 0, fCos);
 153         aTemp.set(2, 2, fCos);
 154         aTemp.set(0, 2, fSin);
 155         aTemp.set(2, 0, -fSin);
 156
 157         aTf *= aTemp;
 158     }
 159
 160     aTf.rotate(0.0, 0.0, fBankAngle);
 161
 162     {
 163         basegfx::B3DHomMatrix aTemp;
 164         const double fSin(aDiff.getX());
 165         const double fCos(fV);
 166
 167         aTemp.set(0, 0, fCos);
 168         aTemp.set(2, 2, fCos);
 169         aTemp.set(0, 2, fSin);
 170         aTemp.set(2, 0, -fSin);
 171
 172         aTf *= aTemp;
 173     }
 174
 175     if ( fV != 0.0 )
 176     {
 177         basegfx::B3DHomMatrix aTemp;
 178         const double fSin(-aDiff.getY() / fV);
 179         const double fCos(aDiff.getZ() / fV);
 180
 181         aTemp.set(1, 1, fCos);
 182         aTemp.set(2, 2, fCos);
 183         aTemp.set(2, 1, fSin);
 184         aTemp.set(1, 2, -fSin);
 185
 186         aTf *= aTemp;
 187     }
 188
 189     SetVUV(aTf * aPrj);
 190 }
 191
 192 void Camera3D::SetFocalLength(double fLen)
 193 {
 194     if ( fLen < 5 )
 195         fLen = 5;
 196     SetPRP(basegfx::B3DPoint(0.0, 0.0, fLen / 35.0 * aViewWin.W));
 197     fFocalLength = fLen;
 198 }
 199
 200 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */