slideshow/source/engine/transitions/spiralwipe.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 #include "spiralwipe.hxx"
  22 #include "transitiontools.hxx"
  23
  24 #include <basegfx/matrix/b2dhommatrix.hxx>
  25 #include <basegfx/polygon/b2dpolygon.hxx>
  26 #include <basegfx/numeric/ftools.hxx>
  27 #include <basegfx/matrix/b2dhommatrixtools.hxx>
  28
  29
  30 namespace slideshow::internal {
  31
  32 SpiralWipe::SpiralWipe( sal_Int32 nElements, bool flipOnYAxis )
  33     : m_elements(nElements),
  34       m_sqrtElements( static_cast<sal_Int32>(
  35                           sqrt( static_cast<double>(nElements) ) ) ),
  36       m_flipOnYAxis(flipOnYAxis)
  37 {
  38 }
  39
  40 ::basegfx::B2DPolyPolygon SpiralWipe::calcNegSpiral( double t ) const
  41 {
  42     const double area = t * m_elements;
  43     const double e = sqrt(area) / 2.0;
  44     const sal_Int32 edge = static_cast<sal_Int32>(e) * 2;
  45
  46     basegfx::B2DHomMatrix aTransform(basegfx::utils::createTranslateB2DHomMatrix(-0.5, -0.5));
  47     const double edge_ = ::basegfx::pruneScaleValue(
  48         static_cast<double>(edge) / m_sqrtElements );
  49     aTransform.scale( edge_, edge_ );
  50     aTransform.translate( 0.5, 0.5 );
  51     ::basegfx::B2DPolygon poly( createUnitRect() );
  52     poly.transform( aTransform );
  53     ::basegfx::B2DPolyPolygon res(poly);
  54
  55     if (! ::basegfx::fTools::equalZero( 1.0 - t )) {
  56         const sal_Int32 edge1 = edge + 1;
  57         sal_Int32 len = static_cast<sal_Int32>( (e - (edge /2)) * edge1 * 4 );
  58         double w = M_PI_2;
  59         while (len > 0) {
  60             const sal_Int32 alen = std::min(len, edge1);
  61             len -= alen;
  62             poly = createUnitRect();
  63             aTransform = basegfx::utils::createScaleB2DHomMatrix(
  64                 ::basegfx::pruneScaleValue( static_cast<double>(alen) / m_sqrtElements ),
  65                 ::basegfx::pruneScaleValue( 1.0 / m_sqrtElements ) );
  66             aTransform.translate(
  67                 - ::basegfx::pruneScaleValue(
  68                     static_cast<double>(edge / 2) / m_sqrtElements ),
  69                 ::basegfx::pruneScaleValue(
  70                     static_cast<double>(edge / 2) / m_sqrtElements ) );
  71             aTransform.rotate( w );
  72             w -= M_PI_2;
  73             aTransform.translate( 0.5, 0.5 );
  74             poly.transform( aTransform );
  75             res.append(poly);
  76         }
  77     }
  78
  79     return res;
  80 }
  81
  82 ::basegfx::B2DPolyPolygon SpiralWipe::operator () ( double t )
  83 {
  84     ::basegfx::B2DPolyPolygon res( createUnitRect() );
  85     ::basegfx::B2DPolyPolygon innerSpiral( calcNegSpiral( 1.0 - t ) );
  86     innerSpiral.flip();
  87     res.append(innerSpiral);
  88     return m_flipOnYAxis ? flipOnYAxis(res) : res;
  89 }
  90
  91 ::basegfx::B2DPolyPolygon BoxSnakesWipe::operator () ( double t )
  92 {
  93     ::basegfx::B2DPolyPolygon res( createUnitRect() );
  94     ::basegfx::B2DPolyPolygon innerSpiral( calcNegSpiral( 1.0 - t ) );
  95     innerSpiral.flip();
  96
  97     if (m_fourBox) {
  98         ::basegfx::B2DHomMatrix aTransform;
  99         aTransform.scale( 0.5, 0.5 );
 100         innerSpiral.transform( aTransform );
 101         res.append(innerSpiral);
 102         res.append( flipOnXAxis(innerSpiral) );
 103         innerSpiral = flipOnYAxis(innerSpiral);
 104         res.append(innerSpiral);
 105         res.append( flipOnXAxis(innerSpiral) );
 106     }
 107     else {
 108         ::basegfx::B2DHomMatrix aTransform;
 109         aTransform.scale( 1.0, 0.5 );
 110         innerSpiral.transform( aTransform );
 111         res.append(innerSpiral);
 112         res.append( flipOnXAxis(innerSpiral) );
 113     }
 114
 115     return m_flipOnYAxis ? flipOnYAxis(res) : res;
 116 }
 117
 118 }
 119
 120 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */