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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <svx/viewpt3d.hxx>
Viewport3D::Viewport3D() :
aVRP(0, 0, 5),
aVPN(0, 0, 1),
aVUV(0, 1, 1),
aPRP(0, 0, 2),
eProjection(ProjectionType::Perspective),
aDeviceRect(Point(0,0), Size(-1,-1)),
aViewPoint (0, 0, 5000),
bTfValid(false)
{
aViewWin.X = -1; aViewWin.Y = -1;
aViewWin.W = 2; aViewWin.H = 2;
}
// Set ViewWindow (in View coordinates)
void Viewport3D::SetViewWindow(double fX, double fY, double fW, double fH)
{
aViewWin.X = fX;
aViewWin.Y = fY;
if ( fW > 0 ) aViewWin.W = fW;
else aViewWin.W = 1.0;
if ( fH > 0 ) aViewWin.H = fH;
else aViewWin.H = 1.0;
}
// Returns observer position (PRP) in world coordinates
const basegfx::B3DPoint& Viewport3D::GetViewPoint()
{
// Calculate View transformations matrix
if ( !bTfValid )
{
double fV, fXupVp, fYupVp;
aViewPoint = aVRP + aVPN * aPRP.getZ();
// Reset to Identity matrix
aViewTf.identity();
// shift in the origin
aViewTf.translate(-aVRP.getX(), -aVRP.getY(), -aVRP.getZ());
// fV = Length of the projection of aVPN on the yz plane:
fV = aVPN.getYZLength();
if ( fV != 0 )
{
basegfx::B3DHomMatrix aTemp;
const double fSin(aVPN.getY() / fV);
const double fCos(aVPN.getZ() / fV);
aTemp.set(2, 2, fCos);
aTemp.set(1, 1, fCos);
aTemp.set(2, 1, fSin);
aTemp.set(1, 2, -fSin);
aViewTf *= aTemp;
}
{
basegfx::B3DHomMatrix aTemp;
const double fSin(-aVPN.getX());
const double fCos(fV);
aTemp.set(2, 2, fCos);
aTemp.set(0, 0, fCos);
aTemp.set(0, 2, fSin);
aTemp.set(2, 0, -fSin);
aViewTf *= aTemp;
}
// Convert X- and Y- coordinates of the view up vector to the
// (preliminary) view coordinate system.
fXupVp = aViewTf.get(0, 0) * aVUV.getX() + aViewTf.get(0, 1) * aVUV.getY() + aViewTf.get(0, 2) * aVUV.getZ();
fYupVp = aViewTf.get(1, 0) * aVUV.getX() + aViewTf.get(1, 1) * aVUV.getY() + aViewTf.get(1, 2) * aVUV.getZ();
fV = std::hypot(fXupVp, fYupVp);
if ( fV != 0 )
{
basegfx::B3DHomMatrix aTemp;
const double fSin(fXupVp / fV);
const double fCos(fYupVp / fV);
aTemp.set(1, 1, fCos);
aTemp.set(0, 0, fCos);
aTemp.set(1, 0, fSin);
aTemp.set(0, 1, -fSin);
aViewTf *= aTemp;
}
bTfValid = true;
}
return aViewPoint;
}
void Viewport3D::SetDeviceWindow(const tools::Rectangle& rRect)
{
aDeviceRect = rRect;
}
// Set View Reference Point
void Viewport3D::SetVRP(const basegfx::B3DPoint& rNewVRP)
{
aVRP = rNewVRP;
bTfValid = false;
}
// Set View Plane Normal
void Viewport3D::SetVPN(const basegfx::B3DVector& rNewVPN)
{
aVPN = rNewVPN;
aVPN.normalize();
bTfValid = false;
}
// Set View Up Vector
void Viewport3D::SetVUV(const basegfx::B3DVector& rNewVUV)
{
aVUV = rNewVUV;
bTfValid = false;
}
// Set Center Of Projection
void Viewport3D::SetPRP(const basegfx::B3DPoint& rNewPRP)
{
aPRP = rNewPRP;
aPRP.setX(0.0);
aPRP.setY(0.0);
bTfValid = false;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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