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diff --git a/graphics/epix/circle.cc b/graphics/epix/circle.cc
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-/*
- * circle.cc -- 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
- */
-#include <cmath>
-
-#include "errors.h"
-
-#include "constants.h"
-
-#include "triples.h"
-#include "state.h"
-
-#include "segment.h"
-#include "frame.h"
-#include "camera.h"
-
-#include "path.h"
-
-#include "paint_style.h"
-
-#include "intersections.h"
-
-#include "circle.h"
-
-namespace ePiX {
-
- static const double EPS(EPIX_EPSILON);
-
- Circle::Circle(const P& ctr, const double rad, const P& perp)
- : m_center(ctr), m_radius(rad), m_perp(perp), m_malformed(false)
- {
- double temp(norm(perp));
- if (temp < EPS)
- {
- epix_warning("Degenerate circle normal, using (0,0,1)");
- m_perp=E_3;
- }
-
- else
- m_perp *= (1.0/temp); // normalize
- }
-
- // point-and-center constructor -- parallel to (x1,x2,0)-plane
- Circle::Circle(const P& ctr, const P& pt)
- : m_center(ctr), m_radius(norm(pt - ctr)), m_perp(E_3), m_malformed(false)
- {
- if (fabs(E_3|(pt - ctr)) > EPS)
- epix_warning("Circle requested with point not in (x,y) plane");
- }
-
- // three-point circle constructor
- Circle::Circle(const P& pt1, const P& pt2, const P& pt3)
- : m_malformed(false)
- {
- P D21(pt2-pt1), D31(pt3-pt1), D32(pt3-pt2), N(D21*D31);
-
- if (norm(D21) < EPS ||
- norm(D31) < EPS ||
- norm(D32) < EPS ||
- norm(N) < EPS)
- {
- epix_warning("Collinear points in Circle constructor");
- m_malformed = true;
- }
-
- else
- {
- m_perp = (1.0/norm(N))*N;
-
- P q2(0.5*(pt1+pt2));
- P dir2(m_perp*(q2-pt1));
-
- P q3(0.5*(pt1+pt3));
- P dir3(m_perp*(q3-pt1));
-
- m_center = Segment(q2, q2+dir2)*Segment(q3, q3+dir3);
- m_radius = norm(m_center - pt1);
- }
- }
-
-
- Circle::Circle(bool tag) : m_malformed(true) { }
-
-
- P Circle::center() const
- {
- return m_center;
- }
-
- double Circle::radius() const
- {
- return m_radius;
- }
-
- P Circle::perp() const
- {
- return m_perp;
- }
-
- bool Circle::malformed() const
- {
- return m_malformed;
- }
-
- // translation
- Circle& Circle::shift(const P& arg)
- {
- if (!m_malformed)
- m_center += arg;
- return *this;
- }
-
- Circle& Circle::move_to(const P& arg)
- {
- if (!m_malformed)
- m_center = arg;
- return *this;
- }
-
- // scale radius
- Circle& Circle::scale(const double c)
- {
- if (!m_malformed)
- m_radius *= c;
- return *this;
- }
-
-
- // project to screen by camera
- void Circle::draw() const
- {
- if (m_malformed)
- return;
-
- // else
- double r(m_radius);
- P N(m_perp);
- frame axes; // standard basis
-
- if (EPS <= norm(N*E_3))
- axes = frame(E_3*N, E_3, N);
-
- path data(m_center, r*(axes.sea()), r*(axes.sky()), 0, full_turn());
- data.close().fill(the_paint_style().fill_flag());
- data.draw();
- }
-
-
- //// global functions ////
- void circle(const P& ctr, const double rad, const P& perp)
- {
- Circle C(ctr, rad, perp);
- C.draw();
- }
-
- void circle(const P& ctr, const P& pt)
- {
- Circle C(ctr, pt);
- C.draw();
- }
-
- void circle(const P& pt1, const P& pt2, const P& pt3)
- {
- Circle C(pt1, pt2, pt3);
- C.draw();
- }
-} // end of namespace