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 <canvas/debug.hxx>
  22 #include "spiralwipe.hxx"
  23 #include "transitiontools.hxx"
  24
  25 #include <basegfx/matrix/b2dhommatrix.hxx>
  26 #include <basegfx/polygon/b2dpolygon.hxx>
  27 #include <basegfx/numeric/ftools.hxx>
  28 #include <basegfx/matrix/b2dhommatrixtools.hxx>
  29
  30
  31 namespace slideshow {
  32 namespace internal {
  33
  34 SpiralWipe::SpiralWipe( sal_Int32 nElements, bool flipOnYAxis )
  35     : m_elements(nElements),
  36       m_sqrtElements( static_cast<sal_Int32>(
  37                           sqrt( static_cast<double>(nElements) ) ) ),
  38       m_flipOnYAxis(flipOnYAxis)
  39 {
  40 }
  41
  42 ::basegfx::B2DPolyPolygon SpiralWipe::calcNegSpiral( double t ) const
  43 {
  44     const double area = (t * m_elements);
  45     const double e = (sqrt(area) / 2.0);
  46     const sal_Int32 edge = (static_cast<sal_Int32>(e) * 2);
  47
  48     basegfx::B2DHomMatrix aTransform(basegfx::tools::createTranslateB2DHomMatrix(-0.5, -0.5));
  49     const double edge_ = ::basegfx::pruneScaleValue(
  50         static_cast<double>(edge) / m_sqrtElements );
  51     aTransform.scale( edge_, edge_ );
  52     aTransform.translate( 0.5, 0.5 );
  53     ::basegfx::B2DPolygon poly( createUnitRect() );
  54     poly.transform( aTransform );
  55     ::basegfx::B2DPolyPolygon res(poly);
  56
  57     if (! ::basegfx::fTools::equalZero( 1.0 - t )) {
  58         const sal_Int32 edge1 = (edge + 1);
  59         sal_Int32 len = static_cast<sal_Int32>( (e - (edge /2)) * edge1 * 4 );
  60         double w = M_PI_2;
  61         while (len > 0) {
  62             const sal_Int32 alen = (len > edge1 ? edge1 : len);
  63             len -= alen;
  64             poly = createUnitRect();
  65             aTransform = basegfx::tools::createScaleB2DHomMatrix(
  66                 ::basegfx::pruneScaleValue( static_cast<double>(alen) / m_sqrtElements ),
  67                 ::basegfx::pruneScaleValue( 1.0 / m_sqrtElements ) );
  68             aTransform.translate(
  69                 - ::basegfx::pruneScaleValue(
  70                     static_cast<double>(edge / 2) / m_sqrtElements ),
  71                 ::basegfx::pruneScaleValue(
  72                     static_cast<double>(edge / 2) / m_sqrtElements ) );
  73             aTransform.rotate( w );
  74             w -= M_PI_2;
  75             aTransform.translate( 0.5, 0.5 );
  76             poly.transform( aTransform );
  77             res.append(poly);
  78         }
  79     }
  80
  81     return res;
  82 }
  83
  84 ::basegfx::B2DPolyPolygon SpiralWipe::operator () ( double t )
  85 {
  86     ::basegfx::B2DPolyPolygon res( createUnitRect() );
  87     ::basegfx::B2DPolyPolygon innerSpiral( calcNegSpiral( 1.0 - t ) );
  88     innerSpiral.flip();
  89     res.append(innerSpiral);
  90     return m_flipOnYAxis ? flipOnYAxis(res) : res;
  91 }
  92
  93 ::basegfx::B2DPolyPolygon BoxSnakesWipe::operator () ( double t )
  94 {
  95     ::basegfx::B2DPolyPolygon res( createUnitRect() );
  96     ::basegfx::B2DPolyPolygon innerSpiral( calcNegSpiral( 1.0 - t ) );
  97     innerSpiral.flip();
  98
  99     if (m_fourBox) {
 100         ::basegfx::B2DHomMatrix aTransform;
 101         aTransform.scale( 0.5, 0.5 );
 102         innerSpiral.transform( aTransform );
 103         res.append(innerSpiral);
 104         res.append( flipOnXAxis(innerSpiral) );
 105         innerSpiral = flipOnYAxis(innerSpiral);
 106         res.append(innerSpiral);
 107         res.append( flipOnXAxis(innerSpiral) );
 108     }
 109     else {
 110         ::basegfx::B2DHomMatrix aTransform;
 111         aTransform.scale( 1.0, 0.5 );
 112         innerSpiral.transform( aTransform );
 113         res.append(innerSpiral);
 114         res.append( flipOnXAxis(innerSpiral) );
 115     }
 116
 117     return m_flipOnYAxis ? flipOnYAxis(res) : res;
 118 }
 119
 120 }
 121 }
 122
 123 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */