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// Copyright (C) 2002 Dominique Devriese <devriese@kde.org>
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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// This program 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
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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// 02110-1301, USA.
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#ifndef KIG_OBJECTS_CURVE_IMP_H
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#define KIG_OBJECTS_CURVE_IMP_H
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#include "object_imp.h"
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/**
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* This class represents a curve: something which is composed of
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* points, like a line, a circle, a locus...
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*/
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class CurveImp
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: public ObjectImp
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{
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public:
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typedef ObjectImp Parent;
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/**
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* Returns the ObjectImpType representing the CurveImp type.
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*/
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static const ObjectImpType* stype();
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Coordinate attachPoint() const;
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// param is between 0 and 1. Note that 0 and 1 should be the
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// end-points. E.g. for a Line, getPoint(0) returns a more or less
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// infinite point. getPoint(0.5) should return the point in the
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// middle.
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virtual double getParam( const Coordinate& point, const KigDocument& ) const = 0;
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// this should be the inverse function of getPoint().
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// Note that it should also do something reasonable when p is not on
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// the curve. You can return an invalid Coordinate(
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// Coordinate::invalidCoord() ) if you need to in some cases.
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virtual const Coordinate getPoint( double param, const KigDocument& ) const = 0;
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virtual CurveImp* copy() const = 0;
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/**
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* Return whether this Curve contains the given point. This is
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* implemented as a numerical approximation. Implementations
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* can/should use the value test_threshold in common.h as a
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* threshold value.
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*/
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virtual bool containsPoint( const Coordinate& p, const KigDocument& ) const = 0;
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};
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#endif
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