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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#include <basegfx/point/b2dpoint.hxx>
#include "doublediamondwipe.hxx"
namespace slideshow::internal {
::basegfx::B2DPolyPolygon DoubleDiamondWipe::operator () ( double t )
{
// outer:
const double a = ::basegfx::pruneScaleValue( 0.25 + (t * 0.75) );
::basegfx::B2DPolygon poly;
poly.append( ::basegfx::B2DPoint( 0.5 + a, 0.5 ) );
poly.append( ::basegfx::B2DPoint( 0.5, 0.5 - a ) );
poly.append( ::basegfx::B2DPoint( 0.5 - a, 0.5 ) );
poly.append( ::basegfx::B2DPoint( 0.5, 0.5 + a ) );
poly.setClosed(true);
::basegfx::B2DPolyPolygon res(poly);
// inner (reverse order to clip):
const double b = ::basegfx::pruneScaleValue( (1.0 - t) * 0.25 );
poly.clear();
poly.append( ::basegfx::B2DPoint( 0.5 + b, 0.5 ) );
poly.append( ::basegfx::B2DPoint( 0.5, 0.5 + b ) );
poly.append( ::basegfx::B2DPoint( 0.5 - b, 0.5 ) );
poly.append( ::basegfx::B2DPoint( 0.5, 0.5 - b ) );
poly.setClosed(true);
res.append(poly);
return res;
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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