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/*************************************************************************
*
* OpenOffice.org - a multi-platform office productivity suite
*
* $RCSfile: doublediamondwipe.cxx,v $
*
* $Revision: 1.5 $
*
* last change: $Author: kz $ $Date: 2006-12-13 15:39:50 $
*
* The Contents of this file are made available subject to
* the terms of GNU Lesser General Public License Version 2.1.
*
*
* GNU Lesser General Public License Version 2.1
* =============================================
* Copyright 2005 by Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, CA 94303, USA
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License version 2.1, as published by the Free Software Foundation.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
************************************************************************/
// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_slideshow.hxx"
#include <canvas/debug.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <basegfx/point/b2dpoint.hxx>
#include "doublediamondwipe.hxx"
namespace slideshow {
namespace 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;
}
}
}
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