slideshow/source/engine/transitions/waterfallwipe.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.
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   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
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   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 <basegfx/matrix/b2dhommatrix.hxx>
  22 #include <basegfx/point/b2dpoint.hxx>
  23 #include <basegfx/numeric/ftools.hxx>
  24 #include <basegfx/matrix/b2dhommatrixtools.hxx>
  25 #include "waterfallwipe.hxx"
  26 #include "transitiontools.hxx"
  27
  28
  29 namespace slideshow {
  30 namespace internal {
  31
  32 WaterfallWipe::WaterfallWipe( sal_Int32 nElements, bool flipOnYAxis )
  33     : m_flipOnYAxis( flipOnYAxis )
  34 {
  35     const sal_Int32 sqrtElements = static_cast<sal_Int32>(
  36         sqrt( static_cast<double>(nElements) ) );
  37     const double elementEdge = (1.0 / sqrtElements);
  38     m_waterfall.append( ::basegfx::B2DPoint( 0.0, -1.0 ) );
  39     for ( sal_Int32 pos = sqrtElements; pos--; )
  40     {
  41         const sal_Int32 xPos = (sqrtElements - pos - 1);
  42         const double yPos = ::basegfx::pruneScaleValue( ((pos + 1) * elementEdge) - 1.0 );
  43         m_waterfall.append( ::basegfx::B2DPoint(
  44                                 ::basegfx::pruneScaleValue( xPos * elementEdge ),
  45                                 yPos ) );
  46         m_waterfall.append( ::basegfx::B2DPoint(
  47                                 ::basegfx::pruneScaleValue( (xPos + 1) * elementEdge ),
  48                                 yPos ) );
  49     }
  50     m_waterfall.append( ::basegfx::B2DPoint( 1.0, -1.0 ) );
  51     m_waterfall.setClosed(true);
  52 }
  53
  54 ::basegfx::B2DPolyPolygon WaterfallWipe::operator () ( double t )
  55 {
  56     ::basegfx::B2DPolygon poly( m_waterfall );
  57     poly.transform(basegfx::utils::createTranslateB2DHomMatrix(0.0, ::basegfx::pruneScaleValue(2.0 * t)));
  58     poly.setB2DPoint( 0, ::basegfx::B2DPoint( 0.0, -1.0 ) );
  59     poly.setB2DPoint( poly.count()-1, ::basegfx::B2DPoint( 1.0, -1.0 ) );
  60
  61     return m_flipOnYAxis ? flipOnYAxis( ::basegfx::B2DPolyPolygon(poly) )
  62                          : ::basegfx::B2DPolyPolygon(poly);
  63 }
  64
  65 }
  66 }
  67
  68 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */