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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
#include <canvas/debug.hxx>
#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 {
namespace 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::tools::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 = (len > edge1 ? edge1 : len);
len -= alen;
poly = createUnitRect();
aTransform = basegfx::tools::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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