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