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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/halfspace.cc
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+/*
+ * halfspace.cc -- ePiX::halfspace class for clipping
+ *
+ * This file is part of ePiX, a C++ library for creating high-quality
+ * figures in LaTeX
+ *
+ * Version 1.1.8
+ * Last Change: July 17, 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 <list>
+
+#include "triples.h"
+#include "edge_data.h"
+#include "crop_algorithms.h"
+
+#include "halfspace.h"
+
+namespace ePiX {
+
+ halfspace::halfspace(const P& base, const P& perp)
+ : m_base(base), m_perp((1.0/norm(perp))*perp) { }
+
+ halfspace& halfspace::reverse()
+ {
+ m_perp *= -1;
+ return *this;
+ }
+
+ bool halfspace::clips(const P& arg) const
+ {
+ return height(m_perp, m_base, arg) < -EPIX_EPSILON;
+ }
+
+ std::list<edge3d>& halfspace::clip_path(std::list<edge3d>& L) const
+ {
+ return chop_path<P>(m_perp, m_base, L);
+ }
+
+ std::list<edge3d>& halfspace::clip_loop(std::list<edge3d>& L) const
+ {
+ return chop_loop<P>(m_perp, m_base, L);
+ }
+} // end of namespace