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.
   4  *
   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) :
  25     aResetPos(rPos),
  26     aResetLookAt(rLookAt),
  27     fBankAngle(0),
  28     bAutoAdjustProjection(true)
  29 {
  30     SetPosition(rPos);
  31     SetLookAt(rLookAt);
  32     SetFocalLength(fFocalLen);
  33 }
  34
  35 Camera3D::Camera3D()
  36     : aResetPos(0.0, 0.0, 1.0)
  37     , fFocalLength(35.0)
  38     , fBankAngle(0.0)
  39     , bAutoAdjustProjection(false)
  40 {
  41 }
  42
  43 // Set default values for reset
  44
  45 void Camera3D::SetDefaults(const basegfx::B3DPoint& rPos, const basegfx::B3DPoint& rLookAt)
  46 {
  47     aResetPos           = rPos;
  48     aResetLookAt        = rLookAt;
  49 }
  50
  51 // Set ViewWindow and adjust PRP
  52
  53 void Camera3D::SetViewWindow(double fX, double fY, double fW, double fH)
  54 {
  55     Viewport3D::SetViewWindow(fX, fY, fW, fH);
  56     if ( bAutoAdjustProjection )
  57         SetFocalLength(fFocalLength);
  58 }
  59
  60 void Camera3D::SetPosition(const basegfx::B3DPoint& rNewPos)
  61 {
  62     if ( rNewPos != aPosition )
  63     {
  64         aPosition = rNewPos;
  65         SetVRP(aPosition);
  66         SetVPN(aPosition - aLookAt);
  67         SetBankAngle(fBankAngle);
  68     }
  69 }
  70
  71 void Camera3D::SetLookAt(const basegfx::B3DPoint& rNewLookAt)
  72 {
  73     if ( rNewLookAt != aLookAt )
  74     {
  75         aLookAt = rNewLookAt;
  76         SetVPN(aPosition - aLookAt);
  77         SetBankAngle(fBankAngle);
  78     }
  79 }
  80
  81 void Camera3D::SetPosAndLookAt(const basegfx::B3DPoint& rNewPos,
  82                                const basegfx::B3DPoint& rNewLookAt)
  83 {
  84     if ( rNewPos != aPosition || rNewLookAt != aLookAt )
  85     {
  86         aPosition = rNewPos;
  87         aLookAt = rNewLookAt;
  88
  89         SetVRP(aPosition);
  90         SetVPN(aPosition - aLookAt);
  91         SetBankAngle(fBankAngle);
  92     }
  93 }
  94
  95 void Camera3D::SetBankAngle(double fAngle)
  96 {
  97     basegfx::B3DVector aDiff(aPosition - aLookAt);
  98     basegfx::B3DVector aPrj(aDiff);
  99     fBankAngle = fAngle;
 100
 101     if ( aDiff.getY() == 0 )
 102     {
 103         aPrj.setY(-1.0);
 104     }
 105     else
 106     {   // aPrj = Projection from aDiff on the XZ-plane
 107         aPrj.setY(0.0);
 108
 109         if ( aDiff.getY() < 0.0 )
 110         {
 111             aPrj = -aPrj;
 112         }
 113     }
 114
 115     // Calculate from aDiff to upwards pointing View-Up-Vector
 116     // duplicated line is intentional!
 117     aPrj = aPrj.getPerpendicular(aDiff);
 118     aPrj = aPrj.getPerpendicular(aDiff);
 119     aDiff.normalize();
 120
 121     // Rotate on Z axis, to rotate the BankAngle and back
 122     basegfx::B3DHomMatrix aTf;
 123     const double fV(sqrt(aDiff.getY() * aDiff.getY() + aDiff.getZ() * aDiff.getZ()));
 124
 125     if ( fV != 0.0 )
 126     {
 127         basegfx::B3DHomMatrix aTemp;
 128         const double fSin(aDiff.getY() / fV);
 129         const double fCos(aDiff.getZ() / fV);
 130
 131         aTemp.set(1, 1, fCos);
 132         aTemp.set(2, 2, fCos);
 133         aTemp.set(2, 1, fSin);
 134         aTemp.set(1, 2, -fSin);
 135
 136         aTf *= aTemp;
 137     }
 138
 139     {
 140         basegfx::B3DHomMatrix aTemp;
 141         const double fSin(-aDiff.getX());
 142         const double fCos(fV);
 143
 144         aTemp.set(0, 0, fCos);
 145         aTemp.set(2, 2, fCos);
 146         aTemp.set(0, 2, fSin);
 147         aTemp.set(2, 0, -fSin);
 148
 149         aTf *= aTemp;
 150     }
 151
 152     aTf.rotate(0.0, 0.0, fBankAngle);
 153
 154     {
 155         basegfx::B3DHomMatrix aTemp;
 156         const double fSin(aDiff.getX());
 157         const double fCos(fV);
 158
 159         aTemp.set(0, 0, fCos);
 160         aTemp.set(2, 2, fCos);
 161         aTemp.set(0, 2, fSin);
 162         aTemp.set(2, 0, -fSin);
 163
 164         aTf *= aTemp;
 165     }
 166
 167     if ( fV != 0.0 )
 168     {
 169         basegfx::B3DHomMatrix aTemp;
 170         const double fSin(-aDiff.getY() / fV);
 171         const double fCos(aDiff.getZ() / fV);
 172
 173         aTemp.set(1, 1, fCos);
 174         aTemp.set(2, 2, fCos);
 175         aTemp.set(2, 1, fSin);
 176         aTemp.set(1, 2, -fSin);
 177
 178         aTf *= aTemp;
 179     }
 180
 181     SetVUV(aTf * aPrj);
 182 }
 183
 184 void Camera3D::SetFocalLength(double fLen)
 185 {
 186     if ( fLen < 5 )
 187         fLen = 5;
 188     SetPRP(basegfx::B3DPoint(0.0, 0.0, fLen / 35.0 * aViewWin.W));
 189     fFocalLength = fLen;
 190 }
 191
 192 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */