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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 */