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authorNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
committerNorbert Preining <norbert@preining.info>2019-09-02 13:46:59 +0900
commite0c6872cf40896c7be36b11dcc744620f10adf1d (patch)
tree60335e10d2f4354b0674ec22d7b53f0f8abee672 /graphics/epix/segment.cc
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+/*
+ * segment.cc -- ePiX::Segment class and mathematical operators
+ *
+ * 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
+ * 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 "triples.h"
+
+#include "path.h"
+#include "segment.h"
+
+namespace ePiX {
+
+ Segment::Segment(const P& p1, const P& p2)
+ : m_endpt1(p1), m_endpt2(p2), m_malformed(false) { }
+
+ Segment::Segment(bool tag) : m_malformed(true) { }
+
+ P Segment::end1() const
+ {
+ return m_endpt1;
+ }
+
+ P Segment::end2() const
+ {
+ return m_endpt2;
+ }
+
+ bool Segment::malformed() const
+ {
+ return m_malformed;
+ }
+
+ // translate
+ Segment& Segment::shift(const P& arg)
+ {
+ if (!m_malformed)
+ {
+ m_endpt1 += arg;
+ m_endpt2 += arg;
+ }
+ return *this;
+ }
+
+ Segment& Segment::move_to(const P& arg)
+ {
+ if (!m_malformed)
+ {
+ const P dX(arg - 0.5*(m_endpt1 + m_endpt2));
+ m_endpt1 += dX;
+ m_endpt2 += dX;
+ }
+ return *this;
+ }
+
+ Segment& Segment::scale(double c)
+ {
+ if (!m_malformed)
+ {
+ const P ctr(0.5*(m_endpt1 + m_endpt2));
+
+ m_endpt1 = ctr + c*(m_endpt1 - ctr);
+ m_endpt2 = ctr + c*(m_endpt2 - ctr);
+ }
+ return *this;
+ }
+
+ P Segment::midpoint() const
+ {
+ return 0.5*(m_endpt1 + m_endpt2);
+ }
+
+ void Segment::draw() const
+ {
+ if (m_malformed)
+ return;
+
+ // else
+ path temp(m_endpt1, m_endpt2);
+
+ temp.draw();
+ }
+} // end of namespace