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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/path_style.cc
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+/*
+ * path_style.cc -- ePiX's class for path styles.
+ *
+ * This file is part of ePiX, a C++ library for creating high-quality
+ * figures in LaTeX
+ *
+ * Version 1.1.18
+ * Last Change: September 15, 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 <string>
+#include <vector>
+
+#include "constants.h"
+
+#include "functions.h" // for snip_to
+#include "utils.h" // for get_chars
+#include "path_style.h"
+
+namespace ePiX {
+
+ // true if arg is a string of ch
+ static bool __epix_all_one_char(const std::string& arg, const char ch)
+ {
+ return arg.find_first_not_of(ch) == std::string::npos;
+ }
+
+ // convert string of dashes, spaces, and periods to a vector of breakpoints
+ static std::vector<double> __epix_get_breakpts(const std::string& pattern)
+ {
+ std::vector<double> value;
+
+ // Assume solid on anomalous input
+ if (pattern.size() == 0
+ || __epix_all_one_char(pattern, '-')
+ || __epix_all_one_char(pattern, ' '))
+ {
+ value.push_back(0);
+ value.push_back(1);
+
+ return value;
+ }
+
+ // else
+ const unsigned int sz(pattern.size()); // not zero
+ const double dt(1.0/sz);
+
+ for (unsigned int i=0; i<sz; ++i)
+ {
+ if (pattern.at(i) == '-')
+ {
+ // previous element was a dash; extend instead of adding breaks
+ if (0 < value.size()
+ && fabs(value.at(value.size()-1) - i*dt) < 0.25*dt)
+ value.at(value.size()-1) = (i+1)*dt;
+
+ else
+ {
+ value.push_back(i*dt);
+ value.push_back((i+1)*dt);
+ }
+ }
+
+ else if (pattern.at(i) == '.')
+ {
+ value.push_back((i+0.5)*dt);
+ value.push_back((i+0.5)*dt); // same value twice
+ }
+ // spaces have no breakpoints, just increment i
+ }
+
+ return value;
+ } // end of __epix_get_breakpts
+
+
+ path_state::path_state()
+ : m_separation(AVG_SEP), m_natural_length(1), m_solid(true)
+ {
+ m_breakpoints.push_back(0);
+ m_breakpoints.push_back(1);
+ }
+
+ path_state::path_state(std::string arg)
+ : m_separation(AVG_SEP), m_solid(false)
+ {
+ // strip out everything but dash, space, period.
+ const std::string pattern(get_chars(arg, "- ."));
+ m_breakpoints = __epix_get_breakpts(pattern); // ok even if pattern=""
+
+ m_natural_length = pattern.size();
+
+ if (m_breakpoints.at(0) == 0 && m_breakpoints.at(1) == 1)
+ {
+ m_solid = true;
+ m_natural_length = 1;
+ }
+ }
+
+ path_state& path_state::separation(double len)
+ {
+ if (0 < len)
+ m_separation = snip_to(len, MIN_SEP, MAX_SEP);
+
+ else
+ m_separation = AVG_SEP;
+
+ return *this;
+ }
+
+ double path_state::separation() const
+ {
+ return m_separation;
+ }
+
+ unsigned int path_state::natural_length() const
+ {
+ return m_natural_length;
+ }
+
+ std::vector<double> path_state::breakpts() const
+ {
+ return m_breakpoints;
+ }
+
+ bool path_state::is_solid() const
+ {
+ return m_solid;
+ }
+
+
+ path_state& the_path_style()
+ {
+ static path_state* the_path_state(new path_state());
+ return *the_path_state;
+ }
+} // end of namespace