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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/diagnose_ex.h>
#include "clippingfunctor.hxx"
#include <basegfx/polygon/b2dpolypolygoncutter.hxx>
#include <basegfx/polygon/b2dpolypolygontools.hxx>
#include <basegfx/polygon/b2dpolygontools.hxx>
#include <basegfx/matrix/b2dhommatrixtools.hxx>
namespace slideshow::internal
{
ClippingFunctor::ClippingFunctor(const ParametricPolyPolygonSharedPtr& rPolygon,
const TransitionInfo& rTransitionInfo,
bool bDirectionForward,
bool bModeIn ) :
mpParametricPoly( rPolygon ),
maStaticTransformation(),
mbForwardParameterSweep( true ),
mbSubtractPolygon( false ),
mbScaleIsotrophically( rTransitionInfo.mbScaleIsotrophically ),
mbFlip(false)
{
ENSURE_OR_THROW( rPolygon,
"ClippingFunctor::ClippingFunctor(): Invalid parametric polygon" );
// maBackgroundRect serves as the minuent when
// subtracting a given clip polygon from the
// background. To speed up the clipper algo, avoid
// actual intersections of the generated
// poly-polygon with the minuent - i.e. choose the
// polygon to subtract from sufficiently large.
// blow up unit rect to (-1,-1),(2,2)
// AW: Not needed, just use range
// ::basegfx::B2DHomMatrix aMatrix;
// aMatrix.scale(3.0,3.0);
// aMatrix.translate(-1.0,-1.0);
// maBackgroundRect.transform( aMatrix );
// extract modification info from maTransitionInfo
// perform general transformations _before_ the reverse
// mode changes. This allows the Transition table to be
// filled more consistently (otherwise, when e.g. rotating
// a clip 90 degrees, the ReverseMethod::FlipX becomes
// ReverseMethod::FlipY instead)
if (rTransitionInfo.mnRotationAngle != 0.0 ||
rTransitionInfo.mnScaleX != 1.0 ||
rTransitionInfo.mnScaleY != 1.0)
{
maStaticTransformation.translate( -0.5, -0.5 );
// apply further transformations:
if (rTransitionInfo.mnRotationAngle != 0.0)
{
maStaticTransformation.rotate(
basegfx::deg2rad(rTransitionInfo.mnRotationAngle) );
}
if (rTransitionInfo.mnScaleX != 1.0 ||
rTransitionInfo.mnScaleY != 1.0)
{
maStaticTransformation.scale(
rTransitionInfo.mnScaleX,
rTransitionInfo.mnScaleY );
}
maStaticTransformation.translate( 0.5, 0.5 );
}
if( !bDirectionForward )
{
// Client has requested reversed
// direction. Apply TransitionInfo's choice
// for that
switch( rTransitionInfo.meReverseMethod )
{
default:
ENSURE_OR_THROW(
false,
"TransitionFactory::TransitionFactory(): Unexpected reverse method" );
break;
case TransitionInfo::ReverseMethod::Ignore:
break;
case TransitionInfo::ReverseMethod::SubtractAndInvert:
mbForwardParameterSweep = !mbForwardParameterSweep;
mbSubtractPolygon = !mbSubtractPolygon;
break;
case TransitionInfo::ReverseMethod::Rotate180:
maStaticTransformation = basegfx::utils::createRotateAroundPoint(0.5, 0.5, M_PI)
* maStaticTransformation;
break;
case TransitionInfo::ReverseMethod::FlipX:
maStaticTransformation = basegfx::utils::createScaleTranslateB2DHomMatrix(-1.0, 1.0, 1.0, 0.0)
* maStaticTransformation;
mbFlip = true;
break;
case TransitionInfo::ReverseMethod::FlipY:
maStaticTransformation = basegfx::utils::createScaleTranslateB2DHomMatrix(1.0, -1.0, 0.0, 1.0)
* maStaticTransformation;
mbFlip = true;
break;
}
}
if( !bModeIn )
{
// client has requested 'out' mode. Apply
// TransitionInfo's method of choice
if( rTransitionInfo.mbOutInvertsSweep )
mbForwardParameterSweep = !mbForwardParameterSweep;
else
mbSubtractPolygon = !mbSubtractPolygon;
}
}
::basegfx::B2DPolyPolygon ClippingFunctor::operator()( double nValue,
const ::basegfx::B2DSize& rTargetSize )
{
// modify clip polygon according to static
// transformation plus current shape size
::basegfx::B2DHomMatrix aMatrix( maStaticTransformation );
// retrieve current clip polygon
::basegfx::B2DPolyPolygon aClipPoly = (*mpParametricPoly)(
mbForwardParameterSweep ? nValue : 1.0 - nValue );
// TODO(Q4): workaround here, better be fixed in cppcanvas
if (aClipPoly.count() == 0)
aClipPoly.append( basegfx::B2DPolygon() );
if (mbFlip)
aClipPoly.flip();
if( mbSubtractPolygon )
{
// subtract given polygon from background
// rect. Do that before any transformations.
// calc maBackgroundRect \ aClipPoly
// =================================
// AW: Simplified
// use a range with fixed size (-1,-1),(2,2)
const basegfx::B2DRange aBackgroundRange(-1, -1, 2, 2);
const basegfx::B2DRange aClipPolyRange(aClipPoly.getB2DRange());
if(aBackgroundRange.isInside(aClipPolyRange))
{
// combine polygons; make the clip polygon the hole
aClipPoly = ::basegfx::utils::correctOrientations(aClipPoly);
aClipPoly.flip();
aClipPoly.insert(0, basegfx::utils::createPolygonFromRect(aBackgroundRange));
}
else
{
// when not completely inside aBackgroundRange clipping is needed
// subtract aClipPoly from aBackgroundRange
const basegfx::B2DPolyPolygon aBackgroundPolyPoly(basegfx::utils::createPolygonFromRect(aBackgroundRange));
aClipPoly = basegfx::utils::solvePolygonOperationDiff(aBackgroundPolyPoly, aClipPoly);
}
}
// scale polygon up to current shape size
if( mbScaleIsotrophically )
{
const double nScale( ::std::max( rTargetSize.getX(),
rTargetSize.getY() ) );
aMatrix.scale( nScale, nScale );
aMatrix.translate( -(nScale-rTargetSize.getX())/2.0,
-(nScale-rTargetSize.getY())/2.0 );
}
else
{
aMatrix.scale( rTargetSize.getX(),
rTargetSize.getY() );
}
// apply cumulative transformation to clip polygon
aClipPoly.transform( aMatrix );
return aClipPoly;
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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