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