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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/clipping.cc
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+/*
+ * clipping.cc -- Implementation of ePiX's current drawing state
+ *
+ * This file is part of ePiX, a C++ library for creating high-quality
+ * figures in LaTeX
+ *
+ * Version 1.1.13
+ * Last Change: August 23, 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 "constants.h"
+#include "triples.h"
+#include "functions.h"
+#include "clipping.h"
+
+namespace ePiX {
+
+ typedef std::list<halfspace>::const_iterator Hp;
+ static const double INF(EPIX_INFTY);
+
+ clip_state::clip_state(const P& arg1, const P& arg2)
+ {
+ double min1(min(arg1.x1(), arg2.x1())), max1(max(arg1.x1(), arg2.x1()));
+ double min2(min(arg1.x2(), arg2.x2())), max2(max(arg1.x2(), arg2.x2()));
+ double min3(min(arg1.x3(), arg2.x3())), max3(max(arg1.x3(), arg2.x3()));
+
+ double avg1(0.5*(min1+max1)), avg2(0.5*(min2+max2)), avg3(0.5*(min3+max3));
+
+ // inward-pointing faces of clip_box
+ m_walls.push_back(halfspace(P(max1,avg2,avg3), P(-1, 0, 0)));
+ m_walls.push_back(halfspace(P(min1,avg2,avg3), P( 1, 0, 0)));
+
+ m_walls.push_back(halfspace(P(avg1,max2,avg3), P( 0,-1, 0)));
+ m_walls.push_back(halfspace(P(avg1,min2,avg3), P( 0, 1, 0)));
+
+ m_walls.push_back(halfspace(P(avg1,avg2,max3), P( 0, 0,-1)));
+ m_walls.push_back(halfspace(P(avg1,avg2,min3), P( 0, 0, 1)));
+ }
+
+ clip_state::clip_state()
+ {
+ m_walls.push_back(halfspace(P( INF, 0, 0), P(-1, 0, 0)));
+ m_walls.push_back(halfspace(P(-INF, 0, 0), P( 1, 0, 0)));
+
+ m_walls.push_back(halfspace(P( 0, INF, 0), P( 0,-1, 0)));
+ m_walls.push_back(halfspace(P( 0,-INF, 0), P( 0, 1, 0)));
+
+ m_walls.push_back(halfspace(P( 0, 0, INF), P( 0, 0,-1)));
+ m_walls.push_back(halfspace(P( 0, 0,-INF), P( 0, 0, 1)));
+ }
+
+
+ clip_state& clip_state::add_face(const P& loc, const P& perp)
+ {
+ if (EPIX_EPSILON < norm(perp))
+ m_extras.push_back(halfspace(loc, perp));
+
+ return *this;
+ }
+
+
+ clip_state& clip_state::clear_extras()
+ {
+ m_extras.clear();
+
+ return *this;
+ }
+
+
+ bool clip_state::clips(const P& arg) const
+ {
+ for (Hp p=m_walls.begin(); p != m_walls.end(); ++p)
+ if ( (*p).clips(arg) )
+ return true;
+
+ for (Hp p=m_extras.begin(); p != m_extras.end(); ++p)
+ if ( (*p).clips(arg) )
+ return true;
+
+ return false;
+ }
+
+ // return reference to clipped argument
+ std::list<edge3d>& clip_state::clip_path(std::list<edge3d>& L) const
+ {
+ for (Hp p=m_walls.begin(); p != m_walls.end(); ++p)
+ (*p).clip_path(L);
+
+ for (Hp p=m_extras.begin(); p != m_extras.end(); ++p)
+ (*p).clip_path(L);
+
+ return L;
+ }
+
+ std::list<edge3d>& clip_state::clip_loop(std::list<edge3d>& L) const
+ {
+ for (Hp p=m_walls.begin(); p != m_walls.end(); ++p)
+ (*p).clip_loop(L);
+
+ for (Hp p=m_extras.begin(); p != m_extras.end(); ++p)
+ (*p).clip_loop(L);
+
+ return L;
+ }
+
+ clip_state& the_clip_box()
+ {
+ static clip_state* the_clip_state(new clip_state());
+ return *the_clip_state;
+ }
+} // end of namespace