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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 "spiralwipe.hxx"
#include "transitiontools.hxx"
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/polygon/b2dpolygon.hxx>
#include <basegfx/numeric/ftools.hxx>
#include <basegfx/matrix/b2dhommatrixtools.hxx>
namespace slideshow::internal {
SpiralWipe::SpiralWipe( sal_Int32 nElements, bool flipOnYAxis )
: m_elements(nElements),
m_sqrtElements( static_cast<sal_Int32>(
sqrt( static_cast<double>(nElements) ) ) ),
m_flipOnYAxis(flipOnYAxis)
{
}
::basegfx::B2DPolyPolygon SpiralWipe::calcNegSpiral( double t ) const
{
const double area = t * m_elements;
const double e = sqrt(area) / 2.0;
const sal_Int32 edge = static_cast<sal_Int32>(e) * 2;
basegfx::B2DHomMatrix aTransform(basegfx::utils::createTranslateB2DHomMatrix(-0.5, -0.5));
const double edge_ = ::basegfx::pruneScaleValue(
static_cast<double>(edge) / m_sqrtElements );
aTransform.scale( edge_, edge_ );
aTransform.translate( 0.5, 0.5 );
::basegfx::B2DPolygon poly( createUnitRect() );
poly.transform( aTransform );
::basegfx::B2DPolyPolygon res(poly);
if (! ::basegfx::fTools::equalZero( 1.0 - t )) {
const sal_Int32 edge1 = edge + 1;
sal_Int32 len = static_cast<sal_Int32>( (e - (edge /2)) * edge1 * 4 );
double w = M_PI_2;
while (len > 0) {
const sal_Int32 alen = std::min(len, edge1);
len -= alen;
poly = createUnitRect();
aTransform = basegfx::utils::createScaleB2DHomMatrix(
::basegfx::pruneScaleValue( static_cast<double>(alen) / m_sqrtElements ),
::basegfx::pruneScaleValue( 1.0 / m_sqrtElements ) );
aTransform.translate(
- ::basegfx::pruneScaleValue(
static_cast<double>(edge / 2) / m_sqrtElements ),
::basegfx::pruneScaleValue(
static_cast<double>(edge / 2) / m_sqrtElements ) );
aTransform.rotate( w );
w -= M_PI_2;
aTransform.translate( 0.5, 0.5 );
poly.transform( aTransform );
res.append(poly);
}
}
return res;
}
::basegfx::B2DPolyPolygon SpiralWipe::operator () ( double t )
{
::basegfx::B2DPolyPolygon res( createUnitRect() );
::basegfx::B2DPolyPolygon innerSpiral( calcNegSpiral( 1.0 - t ) );
innerSpiral.flip();
res.append(innerSpiral);
return m_flipOnYAxis ? flipOnYAxis(res) : res;
}
::basegfx::B2DPolyPolygon BoxSnakesWipe::operator () ( double t )
{
::basegfx::B2DPolyPolygon res( createUnitRect() );
::basegfx::B2DPolyPolygon innerSpiral( calcNegSpiral( 1.0 - t ) );
innerSpiral.flip();
if (m_fourBox) {
::basegfx::B2DHomMatrix aTransform;
aTransform.scale( 0.5, 0.5 );
innerSpiral.transform( aTransform );
res.append(innerSpiral);
res.append( flipOnXAxis(innerSpiral) );
innerSpiral = flipOnYAxis(innerSpiral);
res.append(innerSpiral);
res.append( flipOnXAxis(innerSpiral) );
}
else {
::basegfx::B2DHomMatrix aTransform;
aTransform.scale( 1.0, 0.5 );
innerSpiral.transform( aTransform );
res.append(innerSpiral);
res.append( flipOnXAxis(innerSpiral) );
}
return m_flipOnYAxis ? flipOnYAxis(res) : res;
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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