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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
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