82 lines
2.9 KiB
C++
82 lines
2.9 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include <basegfx/matrix/b2dhommatrix.hxx>
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#include <basegfx/numeric/ftools.hxx>
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#include <basegfx/matrix/b2dhommatrixtools.hxx>
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#include "randomwipe.hxx"
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#include "transitiontools.hxx"
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#include <tools.hxx>
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namespace slideshow::internal {
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RandomWipe::RandomWipe( sal_Int32 nElements, bool randomBars )
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: m_positions( new ::basegfx::B2DPoint[ nElements ] ),
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m_nElements( nElements ),
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m_rect( createUnitRect() )
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{
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::basegfx::B2DHomMatrix aTransform;
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if (randomBars)
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{
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double edge = 1.0 / nElements;
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for ( sal_Int32 pos = nElements; pos--; )
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m_positions[ pos ].setY( ::basegfx::pruneScaleValue( pos * edge ) );
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aTransform.scale( 1.0, ::basegfx::pruneScaleValue(edge) );
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}
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else // dissolve effect
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{
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sal_Int32 sqrtElements = static_cast<sal_Int32>(
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sqrt( static_cast<double>(nElements) ) );
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double edge = 1.0 / sqrtElements;
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for ( sal_Int32 pos = nElements; pos--; ) {
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m_positions[ pos ] = ::basegfx::B2DPoint(
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::basegfx::pruneScaleValue( (pos % sqrtElements) * edge ),
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::basegfx::pruneScaleValue( (pos / sqrtElements) * edge ) );
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}
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const double pedge = ::basegfx::pruneScaleValue(edge);
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aTransform.scale( pedge, pedge );
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}
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m_rect.transform( aTransform );
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// mix up:
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for ( sal_Int32 pos1 = nElements ; pos1-- ; )
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{
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const sal_Int32 pos2 = getRandomOrdinal(pos1+1);
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::std::swap(m_positions[ pos1], m_positions[ pos2 ]);
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}
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}
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::basegfx::B2DPolyPolygon RandomWipe::operator () ( double t )
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{
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::basegfx::B2DPolyPolygon res;
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for ( sal_Int32 pos = static_cast<sal_Int32>(t * m_nElements); pos--; )
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{
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::basegfx::B2DPoint const & point = m_positions[ pos ];
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::basegfx::B2DPolygon poly( m_rect );
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poly.transform(basegfx::utils::createTranslateB2DHomMatrix(point.getX(), point.getY()));
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res.append( poly );
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}
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return res;
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}
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}
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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