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/*
* circle.h -- ePiX::Circle class
*
* This file is part of ePiX, a C++ library for creating high-quality
* figures in LaTeX
*
* Version 1.1.9
* Last Change: July 30, 2007
*/
/*
* Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
* Andrew D. Hwang <rot 13 nujnat at zngupf dot ubylpebff dot rqh>
* Department of Mathematics and Computer Science
* College of the Holy Cross
* Worcester, MA, 01610-2395, USA
*/
/*
* ePiX is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* ePiX 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 General Public
* License for more details.
*
* You should have received a copy of the GNU General Public License
* along with ePiX; if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* This file provides:
*
* The Circle class (center, radius, unit normal).
*
* - Circle() (defaults to origin, unit radius, in (x1,x2,0)-plane
* - Circle(ctr, pt) (parallel to (x1,x2,0)-plane, center ctr, through pt)
* - Circle(pt1, pt2, pt3) (arbitrary non-collinear points)
* - center(), radius(), perp()
* - affine operations: shift(P), move_to(P), scale(double)
* - draw() (ePiX ellipse)
*/
#ifndef EPIX_CIRCLE
#define EPIX_CIRCLE
#include "triples.h"
namespace ePiX {
class Circle {
public:
// defaults to unit circle in (x1,x2,0) plane
Circle(const P& ctr=P(0,0,0), double rad=1, const P& perp=E_3);
Circle(const P& ctr, const P& pt); // center, and point, normal = E_3
Circle(const P& pt1, const P& pt2, const P& pt3); // three points
Circle(bool); // malformed Circle for intersection operators
P center() const;
double radius() const;
P perp() const;
bool malformed() const;
// translate
Circle& shift(const P&);
Circle& move_to(const P&);
// scale radius by c
Circle& scale(double c);
void draw() const;
private:
P m_center;
double m_radius;
P m_perp; // unit normal, even if rad = 0
bool m_malformed;
}; // end of Circle class
// global object-drawing commands
void circle(const P& ctr=P(0,0,0), double rad=1, const P& perp=E_3);
void circle(const P& ctr, const P& pt); // center, and point, normal = E_3
void circle(const P& pt1, const P& pt2, const P& pt3); // three points
} // end of namespace
#endif /* EPIX_CIRCLE */
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