102 lines
3.2 KiB
C++
102 lines
3.2 KiB
C++
/*************************************************************************
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* $RCSfile: bezierclip.hxx,v $
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*
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* $Revision: 1.5 $
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*
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* last change: $Author: rt $ $Date: 2005-09-07 20:56:06 $
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*
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* The Contents of this file are made available subject to
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* the terms of GNU Lesser General Public License Version 2.1.
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*
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*
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* GNU Lesser General Public License Version 2.1
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* =============================================
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* Copyright 2005 by Sun Microsystems, Inc.
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* 901 San Antonio Road, Palo Alto, CA 94303, USA
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License version 2.1, as published by the Free Software Foundation.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*
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************************************************************************/
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#ifndef BASEGFX_BEZIERCLIP_HXX
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#define BASEGFX_BEZIERCLIP_HXX
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#include <vector>
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struct Point2D
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{
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typedef double value_type;
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Point2D( double _x, double _y ) : x(_x), y(_y) {}
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Point2D() : x(), y() {}
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double x;
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double y;
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};
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struct Bezier
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{
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Point2D p0;
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Point2D p1;
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Point2D p2;
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Point2D p3;
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Point2D& operator[]( int i ) { return reinterpret_cast<Point2D*>(this)[i]; }
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const Point2D& operator[]( int i ) const { return reinterpret_cast<const Point2D*>(this)[i]; }
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};
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struct FatLine
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{
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// line L through p1 and p4 in normalized implicit form
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double a;
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double b;
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double c;
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// the upper and lower distance from this line
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double dMin;
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double dMax;
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};
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template <typename DataType> DataType calcLineDistance( const DataType& a,
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const DataType& b,
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const DataType& c,
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const DataType& x,
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const DataType& y )
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{
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return a*x + b*y + c;
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}
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typedef ::std::vector< Point2D > Polygon2D;
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/* little abs template */
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template <typename NumType> NumType absval( NumType x )
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{
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return x<0 ? -x : x;
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}
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Polygon2D convexHull( const Polygon2D& rPoly );
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// TODO: find proper epsilon here (try ::std::numeric_limits<NumType>::epsilon()?)!
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#define DBL_EPSILON 1.0e-100
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/* little approximate comparions */
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template <typename NumType> bool tolZero( NumType n ) { return fabs(n) < DBL_EPSILON; }
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template <typename NumType> bool tolEqual( NumType n1, NumType n2 ) { return tolZero(n1-n2); }
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template <typename NumType> bool tolLessEqual( NumType n1, NumType n2 ) { return tolEqual(n1,n2) || n1<n2; }
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template <typename NumType> bool tolGreaterEqual( NumType n1, NumType n2 ) { return tolEqual(n1,n2) || n1>n2; }
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#endif /* BASEGFX_BEZIERCLIP_HXX */
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