slideshow/source/engine/transitions/spiralwipe.cxx

   1 /*************************************************************************
   2  *
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * Copyright 2008 by Sun Microsystems, Inc.
   6  *
   7  * OpenOffice.org - a multi-platform office productivity suite
   8  *
   9  * $RCSfile: spiralwipe.cxx,v $
  10  * $Revision: 1.7 $
  11  *
  12  * This file is part of OpenOffice.org.
  13  *
  14  * OpenOffice.org is free software: you can redistribute it and/or modify
  15  * it under the terms of the GNU Lesser General Public License version 3
  16  * only, as published by the Free Software Foundation.
  17  *
  18  * OpenOffice.org is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU Lesser General Public License version 3 for more details
  22  * (a copy is included in the LICENSE file that accompanied this code).
  23  *
  24  * You should have received a copy of the GNU Lesser General Public License
  25  * version 3 along with OpenOffice.org.  If not, see
  26  * <http://www.openoffice.org/license.html>
  27  * for a copy of the LGPLv3 License.
  28  *
  29  ************************************************************************/
  30
  31 // MARKER(update_precomp.py): autogen include statement, do not remove
  32 #include "precompiled_slideshow.hxx"
  33
  34 #include <canvas/debug.hxx>
  35 #include "spiralwipe.hxx"
  36 #include "transitiontools.hxx"
  37
  38 #include <basegfx/matrix/b2dhommatrix.hxx>
  39 #include <basegfx/polygon/b2dpolygon.hxx>
  40 #include <basegfx/numeric/ftools.hxx>
  41
  42
  43 namespace slideshow {
  44 namespace internal {
  45
  46 SpiralWipe::SpiralWipe( sal_Int32 nElements, bool flipOnYAxis )
  47     : m_elements(nElements),
  48       m_sqrtElements( static_cast<sal_Int32>(
  49                           sqrt( static_cast<double>(nElements) ) ) ),
  50       m_flipOnYAxis(flipOnYAxis)
  51 {
  52 }
  53
  54 ::basegfx::B2DPolyPolygon SpiralWipe::calcNegSpiral( double t ) const
  55 {
  56     const double area = (t * m_elements);
  57     const double e = (sqrt(area) / 2.0);
  58     const sal_Int32 edge = (static_cast<sal_Int32>(e) * 2);
  59
  60     ::basegfx::B2DHomMatrix aTransform;
  61     aTransform.translate( -0.5, -0.5 );
  62     const double edge_ = ::basegfx::pruneScaleValue(
  63         static_cast<double>(edge) / m_sqrtElements );
  64     aTransform.scale( edge_, edge_ );
  65     aTransform.translate( 0.5, 0.5 );
  66     ::basegfx::B2DPolygon poly( createUnitRect() );
  67     poly.transform( aTransform );
  68     ::basegfx::B2DPolyPolygon res(poly);
  69
  70     if (! ::basegfx::fTools::equalZero( 1.0 - t )) {
  71         const sal_Int32 edge1 = (edge + 1);
  72         sal_Int32 len = static_cast<sal_Int32>( (e - (edge /2)) * edge1 * 4 );
  73         double w = M_PI_2;
  74         while (len > 0) {
  75             const sal_Int32 alen = (len > edge1 ? edge1 : len);
  76             len -= alen;
  77             poly = createUnitRect();
  78             aTransform.identity();
  79             aTransform.scale(
  80                 ::basegfx::pruneScaleValue( static_cast<double>(alen) / m_sqrtElements ),
  81                 ::basegfx::pruneScaleValue( 1.0 / m_sqrtElements ) );
  82             aTransform.translate(
  83                 - ::basegfx::pruneScaleValue(
  84                     static_cast<double>(edge / 2) / m_sqrtElements ),
  85                 ::basegfx::pruneScaleValue(
  86                     static_cast<double>(edge / 2) / m_sqrtElements ) );
  87             aTransform.rotate( w );
  88             w -= M_PI_2;
  89             aTransform.translate( 0.5, 0.5 );
  90             poly.transform( aTransform );
  91             res.append(poly);
  92         }
  93     }
  94
  95     return res;
  96 }
  97
  98 ::basegfx::B2DPolyPolygon SpiralWipe::operator () ( double t )
  99 {
 100     ::basegfx::B2DPolyPolygon res( createUnitRect() );
 101     ::basegfx::B2DPolyPolygon innerSpiral( calcNegSpiral( 1.0 - t ) );
 102     innerSpiral.flip();
 103     res.append(innerSpiral);
 104     return m_flipOnYAxis ? flipOnYAxis(res) : res;
 105 }
 106
 107 ::basegfx::B2DPolyPolygon BoxSnakesWipe::operator () ( double t )
 108 {
 109     ::basegfx::B2DPolyPolygon res( createUnitRect() );
 110     ::basegfx::B2DPolyPolygon innerSpiral( calcNegSpiral( 1.0 - t ) );
 111     innerSpiral.flip();
 112
 113     if (m_fourBox) {
 114         ::basegfx::B2DHomMatrix aTransform;
 115         aTransform.scale( 0.5, 0.5 );
 116         innerSpiral.transform( aTransform );
 117         res.append(innerSpiral);
 118         res.append( flipOnXAxis(innerSpiral) );
 119         innerSpiral = flipOnYAxis(innerSpiral);
 120         res.append(innerSpiral);
 121         res.append( flipOnXAxis(innerSpiral) );
 122     }
 123     else {
 124         ::basegfx::B2DHomMatrix aTransform;
 125         aTransform.scale( 1.0, 0.5 );
 126         innerSpiral.transform( aTransform );
 127         res.append(innerSpiral);
 128         res.append( flipOnXAxis(innerSpiral) );
 129     }
 130
 131     return m_flipOnYAxis ? flipOnYAxis(res) : res;
 132 }
 133
 134 }
 135 }