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 {
  31 namespace internal {
  32
  33 SpiralWipe::SpiralWipe( sal_Int32 nElements, bool flipOnYAxis )
  34     : m_elements(nElements),
  35       m_sqrtElements( static_cast<sal_Int32>(
  36                           sqrt( static_cast<double>(nElements) ) ) ),
  37       m_flipOnYAxis(flipOnYAxis)
  38 {
  39 }
  40
  41 ::basegfx::B2DPolyPolygon SpiralWipe::calcNegSpiral( double t ) const
  42 {
  43     const double area = (t * m_elements);
  44     const double e = (sqrt(area) / 2.0);
  45     const sal_Int32 edge = (static_cast<sal_Int32>(e) * 2);
  46
  47     basegfx::B2DHomMatrix aTransform(basegfx::utils::createTranslateB2DHomMatrix(-0.5, -0.5));
  48     const double edge_ = ::basegfx::pruneScaleValue(
  49         static_cast<double>(edge) / m_sqrtElements );
  50     aTransform.scale( edge_, edge_ );
  51     aTransform.translate( 0.5, 0.5 );
  52     ::basegfx::B2DPolygon poly( createUnitRect() );
  53     poly.transform( aTransform );
  54     ::basegfx::B2DPolyPolygon res(poly);
  55
  56     if (! ::basegfx::fTools::equalZero( 1.0 - t )) {
  57         const sal_Int32 edge1 = (edge + 1);
  58         sal_Int32 len = static_cast<sal_Int32>( (e - (edge /2)) * edge1 * 4 );
  59         double w = M_PI_2;
  60         while (len > 0) {
  61             const sal_Int32 alen = (len > edge1 ? edge1 : len);
  62             len -= alen;
  63             poly = createUnitRect();
  64             aTransform = basegfx::utils::createScaleB2DHomMatrix(
  65                 ::basegfx::pruneScaleValue( static_cast<double>(alen) / m_sqrtElements ),
  66                 ::basegfx::pruneScaleValue( 1.0 / m_sqrtElements ) );
  67             aTransform.translate(
  68                 - ::basegfx::pruneScaleValue(
  69                     static_cast<double>(edge / 2) / m_sqrtElements ),
  70                 ::basegfx::pruneScaleValue(
  71                     static_cast<double>(edge / 2) / m_sqrtElements ) );
  72             aTransform.rotate( w );
  73             w -= M_PI_2;
  74             aTransform.translate( 0.5, 0.5 );
  75             poly.transform( aTransform );
  76             res.append(poly);
  77         }
  78     }
  79
  80     return res;
  81 }
  82
  83 ::basegfx::B2DPolyPolygon SpiralWipe::operator () ( double t )
  84 {
  85     ::basegfx::B2DPolyPolygon res( createUnitRect() );
  86     ::basegfx::B2DPolyPolygon innerSpiral( calcNegSpiral( 1.0 - t ) );
  87     innerSpiral.flip();
  88     res.append(innerSpiral);
  89     return m_flipOnYAxis ? flipOnYAxis(res) : res;
  90 }
  91
  92 ::basegfx::B2DPolyPolygon BoxSnakesWipe::operator () ( double t )
  93 {
  94     ::basegfx::B2DPolyPolygon res( createUnitRect() );
  95     ::basegfx::B2DPolyPolygon innerSpiral( calcNegSpiral( 1.0 - t ) );
  96     innerSpiral.flip();
  97
  98     if (m_fourBox) {
  99         ::basegfx::B2DHomMatrix aTransform;
 100         aTransform.scale( 0.5, 0.5 );
 101         innerSpiral.transform( aTransform );
 102         res.append(innerSpiral);
 103         res.append( flipOnXAxis(innerSpiral) );
 104         innerSpiral = flipOnYAxis(innerSpiral);
 105         res.append(innerSpiral);
 106         res.append( flipOnXAxis(innerSpiral) );
 107     }
 108     else {
 109         ::basegfx::B2DHomMatrix aTransform;
 110         aTransform.scale( 1.0, 0.5 );
 111         innerSpiral.transform( aTransform );
 112         res.append(innerSpiral);
 113         res.append( flipOnXAxis(innerSpiral) );
 114     }
 115
 116     return m_flipOnYAxis ? flipOnYAxis(res) : res;
 117 }
 118
 119 }
 120 }
 121
 122 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */