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