slideshow/source/engine/transitions/doublediamondwipe.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 "doublediamondwipe.hxx"
  25
  26
  27 namespace slideshow {
  28 namespace internal {
  29
  30 ::basegfx::B2DPolyPolygon DoubleDiamondWipe::operator () ( double t )
  31 {
  32     // outer:
  33     const double a = ::basegfx::pruneScaleValue( 0.25 + (t * 0.75) );
  34     ::basegfx::B2DPolygon poly;
  35     poly.append( ::basegfx::B2DPoint( 0.5 + a, 0.5 ) );
  36     poly.append( ::basegfx::B2DPoint( 0.5, 0.5 - a ) );
  37     poly.append( ::basegfx::B2DPoint( 0.5 - a, 0.5 ) );
  38     poly.append( ::basegfx::B2DPoint( 0.5, 0.5 + a ) );
  39     poly.setClosed(true);
  40     ::basegfx::B2DPolyPolygon res(poly);
  41
  42     // inner (reverse order to clip):
  43     const double b = ::basegfx::pruneScaleValue( (1.0 - t) * 0.25 );
  44     poly.clear();
  45     poly.append( ::basegfx::B2DPoint( 0.5 + b, 0.5 ) );
  46     poly.append( ::basegfx::B2DPoint( 0.5, 0.5 + b ) );
  47     poly.append( ::basegfx::B2DPoint( 0.5 - b, 0.5 ) );
  48     poly.append( ::basegfx::B2DPoint( 0.5, 0.5 - b ) );
  49     poly.setClosed(true);
  50     res.append(poly);
  51
  52     return res;
  53 }
  54
  55 }
  56 }
  57
  58 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */