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       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                 :          0 : WaterfallWipe::WaterfallWipe( sal_Int32 nElements, bool flipOnYAxis )
      34                 :          0 :     : m_flipOnYAxis( flipOnYAxis )
      35                 :            : {
      36                 :            :     const sal_Int32 sqrtElements = static_cast<sal_Int32>(
      37                 :          0 :         sqrt( static_cast<double>(nElements) ) );
      38                 :          0 :     const double elementEdge = (1.0 / sqrtElements);
      39                 :          0 :     m_waterfall.append( ::basegfx::B2DPoint( 0.0, -1.0 ) );
      40                 :          0 :     for ( sal_Int32 pos = sqrtElements; pos--; )
      41                 :            :     {
      42                 :          0 :         const sal_Int32 xPos = (sqrtElements - pos - 1);
      43                 :          0 :         const double yPos = ::basegfx::pruneScaleValue( ((pos + 1) * elementEdge) - 1.0 );
      44                 :            :         m_waterfall.append( ::basegfx::B2DPoint(
      45                 :            :                                 ::basegfx::pruneScaleValue( xPos * elementEdge ),
      46                 :          0 :                                 yPos ) );
      47                 :            :         m_waterfall.append( ::basegfx::B2DPoint(
      48                 :            :                                 ::basegfx::pruneScaleValue( (xPos + 1) * elementEdge ),
      49                 :          0 :                                 yPos ) );
      50                 :            :     }
      51                 :          0 :     m_waterfall.append( ::basegfx::B2DPoint( 1.0, -1.0 ) );
      52                 :          0 :     m_waterfall.setClosed(true);
      53                 :          0 : }
      54                 :            : 
      55                 :          0 : ::basegfx::B2DPolyPolygon WaterfallWipe::operator () ( double t )
      56                 :            : {
      57                 :          0 :     ::basegfx::B2DPolygon poly( m_waterfall );
      58                 :          0 :     poly.transform(basegfx::tools::createTranslateB2DHomMatrix(0.0, ::basegfx::pruneScaleValue(2.0 * t)));
      59                 :          0 :     poly.setB2DPoint( 0, ::basegfx::B2DPoint( 0.0, -1.0 ) );
      60                 :          0 :     poly.setB2DPoint( poly.count()-1, ::basegfx::B2DPoint( 1.0, -1.0 ) );
      61                 :            : 
      62                 :            :     return m_flipOnYAxis ? flipOnYAxis( ::basegfx::B2DPolyPolygon(poly) )
      63                 :          0 :                          : ::basegfx::B2DPolyPolygon(poly);
      64                 :            : }
      65                 :            : 
      66                 :            : }
      67                 :            : }
      68                 :            : 
      69                 :            : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */