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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 <tools/b3dtrans.hxx>
#include <osl/diagnose.h>
// Near and far clipping planes
static constexpr double gfNearBound = 0.001;
static constexpr double gfFarBound = 1.001;
// B3dTransformationSet --------------------------------------------------------
// Transformations for all 3D output
B3dTransformationSet::B3dTransformationSet()
{
Reset();
}
B3dTransformationSet::~B3dTransformationSet()
{
}
void B3dTransformationSet::Orientation(basegfx::B3DHomMatrix& rTarget, const basegfx::B3DPoint& aVRP, basegfx::B3DVector aVPN, basegfx::B3DVector aVUP)
{
rTarget.translate( -aVRP.getX(), -aVRP.getY(), -aVRP.getZ());
aVUP.normalize();
aVPN.normalize();
basegfx::B3DVector aRx(aVUP);
basegfx::B3DVector aRy(aVPN);
aRx = aRx.getPerpendicular(aRy);
aRx.normalize();
aRy = aRy.getPerpendicular(aRx);
aRy.normalize();
basegfx::B3DHomMatrix aTemp;
aTemp.set(0, 0, aRx.getX());
aTemp.set(0, 1, aRx.getY());
aTemp.set(0, 2, aRx.getZ());
aTemp.set(1, 0, aRy.getX());
aTemp.set(1, 1, aRy.getY());
aTemp.set(1, 2, aRy.getZ());
aTemp.set(2, 0, aVPN.getX());
aTemp.set(2, 1, aVPN.getY());
aTemp.set(2, 2, aVPN.getZ());
rTarget *= aTemp;
}
void B3dTransformationSet::Frustum(basegfx::B3DHomMatrix& rTarget, double fLeft, double fRight, double fBottom, double fTop, double fNear, double fFar)
{
if(!(fNear > 0.0))
{
fNear = 0.001;
}
if(!(fFar > 0.0))
{
fFar = 1.0;
}
if(fNear == fFar)
{
fFar = fNear + 1.0;
}
if(fLeft == fRight)
{
fLeft -= 1.0;
fRight += 1.0;
}
if(fTop == fBottom)
{
fBottom -= 1.0;
fTop += 1.0;
}
basegfx::B3DHomMatrix aTemp;
aTemp.set(0, 0, 2.0 * fNear / (fRight - fLeft));
aTemp.set(1, 1, 2.0 * fNear / (fTop - fBottom));
aTemp.set(0, 2, (fRight + fLeft) / (fRight - fLeft));
aTemp.set(1, 2, (fTop + fBottom) / (fTop - fBottom));
aTemp.set(2, 2, -1.0 * ((fFar + fNear) / (fFar - fNear)));
aTemp.set(3, 2, -1.0);
aTemp.set(2, 3, -1.0 * ((2.0 * fFar * fNear) / (fFar - fNear)));
aTemp.set(3, 3, 0.0);
rTarget *= aTemp;
}
void B3dTransformationSet::Ortho(basegfx::B3DHomMatrix& rTarget,
double fLeft, double fRight, double fBottom, double fTop,
double fNear, double fFar)
{
if(fNear == fFar)
{
OSL_FAIL("Near and far clipping plane in Ortho definition are identical");
fFar = fNear + 1.0;
}
if(fLeft == fRight)
{
OSL_FAIL("Left and right in Ortho definition are identical");
fLeft -= 1.0;
fRight += 1.0;
}
if(fTop == fBottom)
{
OSL_FAIL("Top and bottom in Ortho definition are identical");
fBottom -= 1.0;
fTop += 1.0;
}
basegfx::B3DHomMatrix aTemp;
aTemp.set(0, 0, 2.0 / (fRight - fLeft));
aTemp.set(1, 1, 2.0 / (fTop - fBottom));
aTemp.set(2, 2, -1.0 * (2.0 / (fFar - fNear)));
aTemp.set(0, 3, -1.0 * ((fRight + fLeft) / (fRight - fLeft)));
aTemp.set(1, 3, -1.0 * ((fTop + fBottom) / (fTop - fBottom)));
aTemp.set(2, 3, -1.0 * ((fFar + fNear) / (fFar - fNear)));
rTarget *= aTemp;
}
/// reset values
void B3dTransformationSet::Reset()
{
// Reset matrices to identity matrices
maObjectTrans.identity();
PostSetObjectTrans();
Orientation(maOrientation);
PostSetOrientation();
maTexture.identity();
mfLeftBound = mfBottomBound = -1.0;
mfRightBound = mfTopBound = 1.0;
mfRatio = 0.0;
maViewportRectangle = tools::Rectangle(-1, -1, 2, 2);
maVisibleRectangle = maViewportRectangle;
mbPerspective = true;
mbProjectionValid = false;
CalcViewport();
}
/// Object transformation
void B3dTransformationSet::PostSetObjectTrans()
{
// Assign and compute inverse
maInvObjectTrans = maObjectTrans;
maInvObjectTrans.invert();
}
void B3dTransformationSet::SetOrientation(const basegfx::B3DPoint& rVRP, const basegfx::B3DVector& rVPN, const basegfx::B3DVector& rVUP)
{
maOrientation.identity();
Orientation(maOrientation, rVRP, rVPN, rVUP);
PostSetOrientation();
}
void B3dTransformationSet::PostSetOrientation()
{
// Assign and compute inverse
maInvOrientation = maOrientation;
maInvOrientation.invert();
}
/// Projections for transformations
void B3dTransformationSet::SetProjection(const basegfx::B3DHomMatrix& mProject)
{
maProjection = mProject;
PostSetProjection();
}
const basegfx::B3DHomMatrix& B3dTransformationSet::GetProjection()
{
if(!mbProjectionValid)
CalcViewport();
return maProjection;
}
void B3dTransformationSet::PostSetProjection()
{
// Assign and compute inverse
maInvProjection = GetProjection();
maInvProjection.invert();
}
/// Transformations for viewport
void B3dTransformationSet::CalcViewport()
{
// Parameters for projection
double fLeft(mfLeftBound);
double fRight(mfRightBound);
double fBottom(mfBottomBound);
double fTop(mfTopBound);
// Adjust projection to aspect ratio, if set
if(GetRatio() != 0.0)
{
// Compute current aspect ratio of boundaries
double fBoundWidth = static_cast<double>(maViewportRectangle.GetWidth() + 1);
double fBoundHeight = static_cast<double>(maViewportRectangle.GetHeight() + 1);
double fActRatio = 1;
double fFactor;
if(fBoundWidth != 0.0)
fActRatio = fBoundHeight / fBoundWidth;
// FIXME else in this case has a lot of problems, should this return.
// scale down larger part
if(fActRatio > mfRatio)
{
// scale down Y
fFactor = fActRatio;
fTop *= fFactor;
fBottom *= fFactor;
}
else
{
// scale down X
fFactor = 1.0 / fActRatio;
fRight *= fFactor;
fLeft *= fFactor;
}
}
// Do projection and object areas overlap?
maSetBound = maViewportRectangle;
// Reset projection with new values
basegfx::B3DHomMatrix aNewProjection;
// #i36281#
// OpenGL needs a little more rough additional size to not let
// the front face vanish. Changed from SMALL_DVALUE to 0.000001,
// which is 1/10000th, comared with 1/tenth of a million from SMALL_DVALUE.
const double fDistPart((gfFarBound - gfNearBound) * 0.0001);
// To avoid critical clipping, set Near & Far generously
if(mbPerspective)
{
Frustum(aNewProjection, fLeft, fRight, fBottom, fTop, gfNearBound - fDistPart, gfFarBound + fDistPart);
}
else
{
Ortho(aNewProjection, fLeft, fRight, fBottom, fTop, gfNearBound - fDistPart, gfFarBound + fDistPart);
}
// Set to true to guarantee loop termination
mbProjectionValid = true;
// set new projection
SetProjection(aNewProjection);
// fill parameters for ViewportTransformation
// Translation
maTranslate.setX(static_cast<double>(maSetBound.Left()) + ((maSetBound.GetWidth() - 1) / 2.0));
maTranslate.setY(static_cast<double>(maSetBound.Top()) + ((maSetBound.GetHeight() - 1) / 2.0));
maTranslate.setZ(ZBUFFER_DEPTH_RANGE / 2.0);
// Scaling
maScale.setX((maSetBound.GetWidth() - 1) / 2.0);
maScale.setY((maSetBound.GetHeight() - 1) / -2.0);
maScale.setZ(ZBUFFER_DEPTH_RANGE / 2.0);
}
void B3dTransformationSet::SetRatio(double fNew)
{
if(mfRatio != fNew)
{
mfRatio = fNew;
mbProjectionValid = false;
}
}
void B3dTransformationSet::SetDeviceRectangle(double fL, double fR, double fB, double fT)
{
if(fL != mfLeftBound || fR != mfRightBound || fB != mfBottomBound || fT != mfTopBound)
{
mfLeftBound = fL;
mfRightBound = fR;
mfBottomBound = fB;
mfTopBound = fT;
mbProjectionValid = false;
// Broadcast changes
DeviceRectangleChange();
}
}
void B3dTransformationSet::DeviceRectangleChange()
{
}
void B3dTransformationSet::SetPerspective(bool bNew)
{
if(mbPerspective != bNew)
{
mbPerspective = bNew;
mbProjectionValid = false;
}
}
void B3dTransformationSet::SetViewportRectangle(tools::Rectangle const & rRect, tools::Rectangle const & rVisible)
{
if(rRect != maViewportRectangle || rVisible != maVisibleRectangle)
{
maViewportRectangle = rRect;
maVisibleRectangle = rVisible;
mbProjectionValid = false;
}
}
// direct access to various transformations
const basegfx::B3DPoint B3dTransformationSet::WorldToEyeCoor(const basegfx::B3DPoint& rVec)
{
basegfx::B3DPoint aVec(rVec);
aVec *= maOrientation;
return aVec;
}
const basegfx::B3DPoint B3dTransformationSet::EyeToWorldCoor(const basegfx::B3DPoint& rVec)
{
basegfx::B3DPoint aVec(rVec);
aVec *= maInvOrientation;
return aVec;
}
// B3dViewport -----------------------------------------------------------------
B3dViewport::B3dViewport()
: B3dTransformationSet(),
aVRP(0, 0, 0),
aVPN(0, 0, 1),
aVUV(0, 1, 0)
{
CalcOrientation();
}
B3dViewport::~B3dViewport()
{
}
void B3dViewport::SetVUV(const basegfx::B3DVector& rNewVUV)
{
aVUV = rNewVUV;
CalcOrientation();
}
void B3dViewport::SetViewportValues(
const basegfx::B3DPoint& rNewVRP,
const basegfx::B3DVector& rNewVPN,
const basegfx::B3DVector& rNewVUV)
{
aVRP = rNewVRP;
aVPN = rNewVPN;
aVUV = rNewVUV;
CalcOrientation();
}
void B3dViewport::CalcOrientation()
{
SetOrientation(aVRP, aVPN, aVUV);
}
// B3dCamera -------------------------------------------------------------------
B3dCamera::B3dCamera(
const basegfx::B3DPoint& rPos, const basegfx::B3DVector& rLkAt,
double fFocLen, double fBnkAng)
: B3dViewport(),
aPosition(rPos),
aLookAt(rLkAt),
fFocalLength(fFocLen),
fBankAngle(fBnkAng)
{
CalcNewViewportValues();
}
B3dCamera::~B3dCamera()
{
}
void B3dCamera::DeviceRectangleChange()
{
// call parent
B3dViewport::DeviceRectangleChange();
// react to changes
CalcNewViewportValues();
}
void B3dCamera::CalcNewViewportValues()
{
basegfx::B3DVector aViewVector(aPosition - aLookAt);
basegfx::B3DVector aNewVPN(aViewVector);
basegfx::B3DVector aNewVUV(0.0, 1.0, 0.0);
if(aNewVPN.getLength() < aNewVPN.getY())
aNewVUV.setX(0.5);
aNewVUV.normalize();
aNewVPN.normalize();
basegfx::B3DVector aNewToTheRight = aNewVPN.getPerpendicular(aNewVUV);
aNewToTheRight.normalize();
aNewVUV = aNewToTheRight.getPerpendicular(aNewVPN);
aNewVUV.normalize();
SetViewportValues(aPosition, aNewVPN, aNewVUV);
CalcFocalLength();
if(fBankAngle != 0.0)
{
basegfx::B3DHomMatrix aRotMat;
aRotMat.rotate(0.0, 0.0, fBankAngle);
basegfx::B3DVector aUp(0.0, 1.0, 0.0);
aUp *= aRotMat;
aUp = EyeToWorldCoor(aUp);
aUp.normalize();
SetVUV(aUp);
}
}
void B3dCamera::CalcFocalLength()
{
double fWidth = GetDeviceRectangleWidth();
// Adjust focal length based on given position
basegfx::B3DPoint aOldPosition = WorldToEyeCoor({});
if(fWidth != 0.0)
fFocalLength = aOldPosition.getZ() / fWidth * 35.0;
if(fFocalLength < 5.0)
fFocalLength = 5.0;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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