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Copy pathgnuplot_i.hpp
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1893 lines (1623 loc) · 56.9 KB
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////////////////////////////////////////////////////////////////////////////////
///
/// \brief A C++ interface to gnuplot.
///
///
/// The interface uses pipes and so won't run on a system that doesn't have
/// POSIX pipe support Tested on Windows (MinGW and Visual C++) and Linux (GCC)
///
/// Version history:
/// 0. C interface
/// by N. Devillard (27/01/03)
/// 1. C++ interface: direct translation from the C interface
/// by Rajarshi Guha (07/03/03)
/// 2. corrections for Win32 compatibility
/// by V. Chyzhdzenka (20/05/03)
/// 3. some member functions added, corrections for Win32 and Linux
/// compatibility
/// by M. Burgis (10/03/08)
///
/// Requirements:
/// * gnuplot has to be installed (http://www.gnuplot.info/download.html)
/// * for Windows: set Path-Variable for Gnuplot path
/// (e.g. C:/program files/gnuplot/bin)
/// or set Gnuplot path with:
/// Gnuplot::set_GNUPlotPath(const std::string &path);
///
////////////////////////////////////////////////////////////////////////////////
#ifndef GNUPLOT_I_HPP
#define GNUPLOT_I_HPP
#include <iostream>
#include <string>
#include <vector>
#include <fstream>
#include <sstream> // for std::ostringstream
#include <stdexcept>
#include <cstdlib> // for getenv()
#include <list> // for std::list
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__TOS_WIN__)
//defined for 32 and 64-bit environments
#include <io.h> // for _access(), _mktemp()
#define GP_MAX_TMP_FILES 27 // 27 temporary files it's Microsoft restriction
#elif defined(unix) || defined(__unix) || defined(__unix__) || defined(__APPLE__)
//all UNIX-like OSs (Linux, *BSD, MacOSX, Solaris, ...)
#include <unistd.h> // for access(), mkstemp()
#define GP_MAX_TMP_FILES 64
#else
#error unsupported or unknown operating system
#endif
//declare classes in global namespace
class GnuplotException : public std::runtime_error
{
public:
explicit GnuplotException(const std::string &msg) : std::runtime_error(msg) {}
};
class Gnuplot
{
//----------------------------------------------------------------------------------
// member data
///\brief pointer to the stream that can be used to write to the pipe
FILE *gnucmd;
///\brief validation of gnuplot session
bool valid;
///\brief true = 2d, false = 3d
bool two_dim;
///\brief number of plots in session
int nplots;
///\brief functions and data are displayed in a defined styles
std::string pstyle;
///\brief interpolate and approximate data in defined styles (e.g. spline)
std::string smooth;
///\brief list of created tmpfiles
std::vector<std::string> tmpfile_list;
//----------------------------------------------------------------------------------
// static data
///\brief number of all tmpfiles (number of tmpfiles restricted)
static int tmpfile_num;
///\brief name of executed GNUPlot file
static std::string m_sGNUPlotFileName;
///\brief gnuplot path
static std::string m_sGNUPlotPath;
///\brief standard terminal, used by showonscreen
static std::string terminal_std;
//----------------------------------------------------------------------------------
// member functions (auxiliary functions)
// ---------------------------------------------------
///\brief get_program_path(); and popen();
// ---------------------------------------------------
void init(void);
// ---------------------------------------------------
///\brief creates tmpfile and returns its name
///
/// \param tmp points to the tempfile
///
/// \return the name of the tempfile
// ---------------------------------------------------
std::string create_tmpfile(std::ofstream &tmp);
//----------------------------------------------------------------------------------
///\brief gnuplot path found?
///
/// \return found the gnuplot path (yes == true, no == false)
// ---------------------------------------------------------------------------------
static bool get_program_path(void);
// ---------------------------------------------------------------------------------
///\brief checks if file is available
///
/// \param filename the filename
///
/// \return file exists (yes == true, no == false)
// ---------------------------------------------------------------------------------
static bool file_available(const std::string &filename);
// ---------------------------------------------------------------------------------
///\brief checks if file exists
///
/// \param filename the filename
/// \param mode the mode [optional,default value = 0]
///
/// \return file exists (yes == true, no == false)
// ---------------------------------------------------------------------------------
static bool file_exists(const std::string &filename, int mode = 0);
public:
// ----------------------------------------------------------------------------
/// \brief optional function: set Gnuplot path manual
/// attention: for windows: path with slash '/' not backslash '\'
///
/// \param path the gnuplot path
///
/// \return true on success, false otherwise
// ----------------------------------------------------------------------------
static bool set_GNUPlotPath(const std::string &path);
// ----------------------------------------------------------------------------
/// optional: set standard terminal, used by showonscreen
/// defaults: Windows - win, Linux - x11, Mac - aqua
///
/// \param type the terminal type
// ----------------------------------------------------------------------------
static void set_terminal_std(const std::string &type);
//-----------------------------------------------------------------------------
// constructors
// ----------------------------------------------------------------------------
///\brief set a style during construction
explicit Gnuplot(const std::string &style = "points");
/// plot a single std::vector at one go
explicit Gnuplot(const std::vector<double> &x,
const std::string &title = "",
const std::string &style = "points",
const std::string &labelx = "x",
const std::string &labely = "y");
/// plot pairs std::vector at one go
explicit Gnuplot(const std::vector<double> &x,
const std::vector<double> &y,
const std::string &title = "",
const std::string &style = "points",
const std::string &labelx = "x",
const std::string &labely = "y");
/// plot triples std::vector at one go
explicit Gnuplot(const std::vector<double> &x,
const std::vector<double> &y,
const std::vector<double> &z,
const std::string &title = "",
const std::string &style = "points",
const std::string &labelx = "x",
const std::string &labely = "y",
const std::string &labelz = "z");
/// destructor: needed to delete temporary files
~Gnuplot(void);
//----------------------------------------------------------------------------------
/// send a command to gnuplot
Gnuplot& cmd(const std::string &cmdstr);
// -------------------------------------------------------------------------
///\brief Sends a command to an active gnuplot session, identical to cmd()
/// send a command to gnuplot using the << operator
///
/// \param cmdstr the command string
///
/// \return a reference to the gnuplot object
// -------------------------------------------------------------------------
inline Gnuplot& operator<<(const std::string &cmdstr)
{
return cmd(cmdstr);
}
//--------------------------------------------------------------------------
// show on screen or write to file
/// sets terminal type to terminal_std
Gnuplot& showonscreen(void); // window output is set by default (win/x11/aqua)
/// Saves a gnuplot to a file named filename. Defaults to saving pdf
Gnuplot& savetofigure(const std::string &filename,
const std::string &terminal = "ps");
//--------------------------------------------------------------------------
// set and unset
/// set line style (some of these styles require additional information):
/// lines, points, linespoints, impulses, dots, steps, fsteps, histeps,
/// boxes, histograms, filledcurves
Gnuplot& set_style(const std::string &stylestr = "points");
/// interpolation and approximation of data, arguments:
/// csplines, bezier, acsplines (for data values > 0), sbezier, unique, frequency
/// (works only with plot_x, plot_xy, plotfile_x, plotfile_xy
/// (if smooth is set, set_style has no effect on data plotting)
Gnuplot& set_smooth(const std::string &stylestr = "csplines");
// ----------------------------------------------------------------------
/// \brief unset smooth
/// attention: smooth is not set by default
///
/// \return a reference to a gnuplot object
// ----------------------------------------------------------------------
inline Gnuplot& unset_smooth(void)
{
smooth.clear();
return *this;
}
/// scales the size of the points used in plots
Gnuplot& set_pointsize(const double pointsize = 1.0);
/// turns grid on/off
inline Gnuplot& set_grid(void)
{
return cmd("set grid");
}
/// grid is not set by default
inline Gnuplot& unset_grid(void)
{
return cmd("unset grid");
}
// -----------------------------------------------
/// set the multiplot mode
///
/// \return reference to the gnuplot object
// -----------------------------------------------
inline Gnuplot& set_multiplot(void)
{
return cmd("set multiplot");
}
// -----------------------------------------------
/// unsets the multiplot mode
///
/// \return reference to the gnuplot object
// -----------------------------------------------
inline Gnuplot& unset_multiplot(void)
{
return cmd("unset multiplot");
}
/// set sampling rate of functions, or for interpolating data
Gnuplot& set_samples(const int samples = 100);
/// set isoline density (grid) for plotting functions as surfaces (for 3d plots)
Gnuplot& set_isosamples(const int isolines = 10);
// --------------------------------------------------------------------------
/// enables/disables hidden line removal for surface plotting (for 3d plot)
///
/// \return reference to the gnuplot object
// --------------------------------------------------------------------------
Gnuplot& set_hidden3d(void)
{
return cmd("set hidden3d");
}
// ---------------------------------------------------------------------------
/// hidden3d is not set by default
///
/// \return reference to the gnuplot object
// ---------------------------------------------------------------------------
inline Gnuplot& unset_hidden3d(void)
{
return cmd("unset hidden3d");
}
/// enables/disables contour drawing for surfaces (for 3d plot)
/// base, surface, both
Gnuplot& set_contour(const std::string &position = "base");
// --------------------------------------------------------------------------
/// contour is not set by default, it disables contour drawing for surfaces
///
/// \return reference to the gnuplot object
// ------------------------------------------------------------------
inline Gnuplot& unset_contour(void)
{
return cmd("unset contour");
}
// ------------------------------------------------------------
/// enables/disables the display of surfaces (for 3d plot)
///
/// \return reference to the gnuplot object
// ------------------------------------------------------------------
inline Gnuplot& set_surface(void)
{
return cmd("set surface");
}
// ----------------------------------------------------------
/// surface is set by default,
/// it disables the display of surfaces (for 3d plot)
///
/// \return reference to the gnuplot object
// ------------------------------------------------------------------
inline Gnuplot& unset_surface(void)
{
return cmd("unset surface");
}
/// switches legend on/off
/// position: inside/outside, left/center/right, top/center/bottom, nobox/box
Gnuplot& set_legend(const std::string &position = "default");
// ------------------------------------------------------------------
/// \brief Switches legend off
/// attention:legend is set by default
///
/// \return reference to the gnuplot object
// ------------------------------------------------------------------
inline Gnuplot& unset_legend(void)
{
return cmd("unset key");
}
// -----------------------------------------------------------------------
/// \brief sets and clears the title of a gnuplot session
///
/// \param title the title of the plot [optional, default == ""]
///
/// \return reference to the gnuplot object
// -----------------------------------------------------------------------
inline Gnuplot& set_title(const std::string &title = "")
{
const std::string cmdstr("set title \"" + title + "\"");
*this << cmdstr;
return *this;
}
//----------------------------------------------------------------------------------
///\brief Clears the title of a gnuplot session
/// The title is not set by default.
///
/// \return reference to the gnuplot object
// ---------------------------------------------------------------------------------
inline Gnuplot& unset_title(void)
{
return this->set_title();
}
/// set x axis label
Gnuplot& set_ylabel(const std::string &label = "x");
/// set y axis label
Gnuplot& set_xlabel(const std::string &label = "y");
/// set z axis label
Gnuplot& set_zlabel(const std::string &label = "z");
/// set axis - ranges
Gnuplot& set_xrange(const double iFrom,
const double iTo);
/// set y-axis - ranges
Gnuplot& set_yrange(const double iFrom,
const double iTo);
/// set z-axis - ranges
Gnuplot& set_zrange(const double iFrom,
const double iTo);
/// autoscale axis (set by default) of xaxis
///
/// \return reference to the gnuplot object
// -----------------------------------------------
inline Gnuplot& set_xautoscale(void)
{
(void)cmd("set xrange restore");
return cmd("set autoscale x");
}
// -----------------------------------------------
/// autoscale axis (set by default) of yaxis
///
/// \return reference to the gnuplot object
// -----------------------------------------------
inline Gnuplot& set_yautoscale(void)
{
(void)cmd("set yrange restore");
return cmd("set autoscale y");
}
// -----------------------------------------------
/// autoscale axis (set by default) of zaxis
///
/// \return reference to the gnuplot object
// -----------------------------------------------
inline Gnuplot& set_zautoscale(void)
{
(void)cmd("set zrange restore");
return cmd("set autoscale z");
}
/// turns on/off log scaling for the specified xaxis (logscale is not set by default)
Gnuplot& set_xlogscale(const double base = 10);
/// turns on/off log scaling for the specified yaxis (logscale is not set by default)
Gnuplot& set_ylogscale(const double base = 10);
/// turns on/off log scaling for the specified zaxis (logscale is not set by default)
Gnuplot& set_zlogscale(const double base = 10);
// -----------------------------------------------
/// turns off log scaling for the x axis
///
/// \return reference to the gnuplot object
// -----------------------------------------------
inline Gnuplot& unset_xlogscale(void)
{
return cmd("unset logscale x");
}
// -----------------------------------------------
/// turns off log scaling for the y axis
///
/// \return reference to the gnuplot object
// -----------------------------------------------
inline Gnuplot& unset_ylogscale(void)
{
return cmd("unset logscale y");
}
// -----------------------------------------------
/// turns off log scaling for the z axis
///
/// \return reference to the gnuplot object
// -----------------------------------------------
inline Gnuplot& unset_zlogscale(void)
{
return cmd("unset logscale z");
}
/// set palette range (autoscale by default)
Gnuplot& set_cbrange(const double iFrom, const double iTo);
//--------------------------------------------------------------------------
// plot
/// plot a single std::vector: x
/// from file
Gnuplot& plotfile_x(const std::string &filename,
const unsigned int column = 1,
const std::string &title = "");
/// from std::vector
template<typename X>
Gnuplot& plot_x(const X& x, const std::string &title = "");
/// plot x,y pairs: x y
/// from file
Gnuplot& plotfile_xy(const std::string &filename,
const unsigned int column_x = 1,
const unsigned int column_y = 2,
const std::string &title = "");
/// from data
template<typename X, typename Y>
Gnuplot& plot_xy(const X& x, const Y& y, const std::string &title = "");
/// plot x,y pairs with dy errorbars: x y dy
/// from file
Gnuplot& plotfile_xy_err(const std::string &filename,
const unsigned int column_x = 1,
const unsigned int column_y = 2,
const unsigned int column_dy = 3,
const std::string &title = "");
/// from data
template<typename X, typename Y, typename E>
Gnuplot& plot_xy_err(const X &x, const Y &y, const E &dy,
const std::string &title = "");
/// plot x,y,z triples: x y z
/// from file
Gnuplot& plotfile_xyz(const std::string &filename,
const unsigned int column_x = 1,
const unsigned int column_y = 2,
const unsigned int column_z = 3,
const std::string &title = "");
/// from std::vector
template<typename X, typename Y, typename Z>
Gnuplot& plot_xyz(const X &x,
const Y &y,
const Z &z,
const std::string &title = "");
/// plot an equation of the form: y = ax + b, you supply a and b
Gnuplot& plot_slope(const double a,
const double b,
const std::string &title = "");
/// plot an equation supplied as a std::string y=f(x), write only the
/// function f(x) not y the independent variable has to be x
/// binary operators: ** exponentiation, * multiply, / divide, + add, -
/// subtract, % modulo
/// unary operators: - minus, ! factorial
/// elementary functions: rand(x), abs(x), sgn(x), ceil(x), floor(x),
/// int(x), imag(x), real(x), arg(x), sqrt(x), exp(x), log(x), log10(x),
/// sin(x), cos(x), tan(x), asin(x), acos(x), atan(x), atan2(y,x),
/// sinh(x), cosh(x), tanh(x), asinh(x), acosh(x), atanh(x)
/// special functions: erf(x), erfc(x), inverf(x), gamma(x), igamma(a,x),
/// lgamma(x), ibeta(p,q,x), besj0(x), besj1(x), besy0(x), besy1(x),
/// lambertw(x)
/// statistical functions: norm(x), invnorm(x)
Gnuplot& plot_equation(const std::string &equation,
const std::string &title = "");
/// plot an equation supplied as a std::string z=f(x,y), write only the
/// function f(x,y) not z the independent variables have to be x and y
Gnuplot& plot_equation3d(const std::string &equation,
const std::string &title = "");
/// plot image
Gnuplot& plot_image(const unsigned char *ucPicBuf,
const unsigned int iWidth,
const unsigned int iHeight,
const std::string &title = "");
//--------------------------------------------------------------------------
///\brief replot repeats the last plot or splot command.
/// this can be useful for viewing a plot with different set options,
/// or when generating the same plot for several devices (showonscreen,
/// savetofigure)
///
/// \return ---
//--------------------------------------------------------------------------
inline Gnuplot& replot(void)
{
if (nplots > 0)
{
return cmd("replot");
}
return *this;
}
/// resets a gnuplot session (next plot will erase previous ones)
Gnuplot& reset_plot(void);
/// resets a gnuplot session and sets all variables to default
Gnuplot& reset_all(void);
/// deletes temporary files
void remove_tmpfiles(void);
/// \brief Is the gnuplot session valid ??
///
/// \return true if valid, false if not
inline bool is_valid(void) const
{
return valid;
}
};
//------------------------------------------------------------------------------
//
// initialize static data
//
int Gnuplot::tmpfile_num = 0;
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__TOS_WIN__)
std::string Gnuplot::m_sGNUPlotFileName = "pgnuplot.exe";
std::string Gnuplot::m_sGNUPlotPath = "C:/program files/gnuplot/bin/";
#elif defined(unix) || defined(__unix) || defined(__unix__) || defined(__APPLE__)
std::string Gnuplot::m_sGNUPlotFileName = "gnuplot";
std::string Gnuplot::m_sGNUPlotPath = "/usr/local/bin/";
#endif
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__TOS_WIN__)
std::string Gnuplot::terminal_std = "windows";
#elif ( defined(unix) || defined(__unix) || defined(__unix__) ) && !defined(__APPLE__)
std::string Gnuplot::terminal_std = "x11";
#elif defined(__APPLE__)
std::string Gnuplot::terminal_std = "aqua";
#endif
//------------------------------------------------------------------------------
//
// constructor: set a style during construction
//
inline Gnuplot::Gnuplot(const std::string &style)
: gnucmd(nullptr) , valid(false) , two_dim(false) , nplots(0)
{
init();
(void)set_style(style);
}
//------------------------------------------------------------------------------
//
// constructor: open a new session, plot a signal (x)
//
inline Gnuplot::Gnuplot(const std::vector<double> &x,
const std::string &title,
const std::string &style,
const std::string &labelx,
const std::string &labely)
: gnucmd(nullptr) , valid(false) , two_dim(false) , nplots(0)
{
init();
(void)set_style(style);
(void)set_xlabel(labelx);
(void)set_ylabel(labely);
(void)plot_x(x, title);
}
// constructor: open a new session, plot a signal (x,y)
inline Gnuplot::Gnuplot(const std::vector<double> &x,
const std::vector<double> &y,
const std::string &title,
const std::string &style,
const std::string &labelx,
const std::string &labely)
: gnucmd(nullptr) , valid(false) , two_dim(false) , nplots(0)
{
init();
(void)set_style(style);
(void)set_xlabel(labelx);
(void)set_ylabel(labely);
(void)plot_xy(x, y, title);
}
// constructor: open a new session, plot a signal (x,y,z)
inline Gnuplot::Gnuplot(const std::vector<double> &x,
const std::vector<double> &y,
const std::vector<double> &z,
const std::string &title,
const std::string &style,
const std::string &labelx,
const std::string &labely,
const std::string &labelz)
: gnucmd(nullptr) , valid(false) , two_dim(false) , nplots(0)
{
init();
(void)set_style(style);
(void)set_xlabel(labelx);
(void)set_ylabel(labely);
(void)set_zlabel(labelz);
(void)plot_xyz(x, y, z, title);
}
/// Plots a 2d graph from a list of doubles: x
template<typename X>
Gnuplot& Gnuplot::plot_x(const X& x, const std::string &title)
{
if (x.empty())
{
throw GnuplotException("std::vector too small");
}
std::ofstream tmp;
std::string name = create_tmpfile(tmp);
if (name.empty())
{
return *this;
}
//
// write the data to file
//
for (unsigned int i = 0; i < x.size(); ++i)
{
tmp << x[i] << std::endl;
}
tmp.flush();
tmp.close();
plotfile_x(name, 1, title);
return *this;
}
/// Plots a 2d graph from a list of doubles: x y
template<typename X, typename Y>
Gnuplot& Gnuplot::plot_xy(const X& x, const Y& y, const std::string &title)
{
if (x.empty() || y.empty())
{
throw GnuplotException("std::vectors too small");
}
if (x.size() != y.size())
{
throw GnuplotException("Length of the std::vectors differs");
}
std::ofstream tmp;
const std::string name = create_tmpfile(tmp);
if (name.empty())
{
throw GnuplotException("Unable to create tmp-file.");
}
// write the data to file
for (std::size_t i = 0; i < x.size(); ++i)
{
tmp << x[i] << " " << y[i] << std::endl;
}
// Cleanup
tmp.flush();
tmp.close();
// Plot
plotfile_xy(name, 1, 2, title);
return *this;
}
/// Plot x,y pairs with dy errorbars
template<typename X, typename Y, typename E>
Gnuplot& Gnuplot::plot_xy_err(const X &x,
const Y &y,
const E &dy,
const std::string &title)
{
if (x.empty() || y.empty() || dy.empty())
{
throw GnuplotException("std::vectors too small");
}
if (x.size() != y.size() || y.size() != dy.size())
{
throw GnuplotException("Length of the std::vectors differs");
}
std::ofstream tmp;
const std::string name = create_tmpfile(tmp);
if (name.empty())
{
throw GnuplotException("Unable to create tmp-file.");
}
// write the data to file
for (std::size_t i = 0; i < x.size(); ++i)
{
tmp << x[i] << " " << y[i] << " " << dy[i] << std::endl;
}
// Cleanup
tmp.flush();
tmp.close();
// Do the actual plot
plotfile_xy_err(name, 1, 2, 3, title);
return *this;
}
/// Plots a 3d graph from a list of doubles: x y z
template<typename X, typename Y, typename Z>
Gnuplot& Gnuplot::plot_xyz(const X &x,
const Y &y,
const Z &z,
const std::string &title)
{
if (x.empty() || y.empty() || z.empty())
{
throw GnuplotException("std::vectors too small");
}
if (x.size() != y.size() || x.size() != z.size())
{
throw GnuplotException("Length of the std::vectors differs");
}
std::ofstream tmp;
const std::string name = create_tmpfile(tmp);
if (name.empty())
{
throw GnuplotException("Unable to create tmp-file.");
}
// write the data to file
for (std::size_t i = 0; i < x.size(); ++i)
{
tmp << x[i] << " " << y[i] << " " << z[i] << std::endl;
}
// cleanup
tmp.flush();
tmp.close();
// plot file
plotfile_xyz(name, 1, 2, 3, title);
return *this;
}
// define static member function: set Gnuplot path manual
// for windows: path with slash '/' not backslash '\'
//
bool Gnuplot::set_GNUPlotPath(const std::string &path)
{
const std::string tmp = path + "/" + Gnuplot::m_sGNUPlotFileName;
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__TOS_WIN__)
if ( Gnuplot::file_exists(tmp, 0) ) // check existence
#elif defined(unix) || defined(__unix) || defined(__unix__) || defined(__APPLE__)
if ( Gnuplot::file_exists(tmp, 1) ) // check existence and execution permission
#endif
{
Gnuplot::m_sGNUPlotPath = path;
return true;
}
Gnuplot::m_sGNUPlotPath.clear();
return false;
}
//------------------------------------------------------------------------------
//
// define static member function: set default terminal, used by showonscreen
// defaults: Windows - win, Linux - x11, Mac - aqua
//
void Gnuplot::set_terminal_std(const std::string &type)
{
#if defined(unix) || defined(__unix) || defined(__unix__) || defined(__APPLE__)
if (type.find("x11") != std::string::npos && getenv("DISPLAY") == nullptr)
{
throw GnuplotException("Can't find DISPLAY variable");
}
#endif
Gnuplot::terminal_std = type;
}
//------------------------------------------------------------------------------
//
// A string tokenizer taken from http://www.sunsite.ualberta.ca/Documentation/
// /Gnu/libstdc++-2.90.8/html/21_strings/stringtok_std_h.txt
//
template <typename Container>
void stringtok (Container &container,
std::string const &in,
const char * const delimiters = " \t\n")
{
const std::string::size_type len = in.length();
std::string::size_type i = 0;
while ( i < len )
{
// eat leading whitespace
i = in.find_first_not_of (delimiters, i);
if (i == std::string::npos)
{
return; // nothing left but white space
}
// find the end of the token
const std::string::size_type j = in.find_first_of (delimiters, i);
// push token
if (j == std::string::npos)
{
container.push_back (in.substr(i));
return;
}
container.push_back (in.substr(i, j - i));
// set up for next loop
i = j + 1;
}
return;
}
//------------------------------------------------------------------------------
//
// Destructor: needed to delete temporary files
//
Gnuplot::~Gnuplot(void)
{
// remove_tmpfiles();
// A stream opened by popen() should be closed by pclose()
#if defined(WIN32) || defined(_WIN32) || defined(__WIN32__) || defined(__TOS_WIN__)
if (_pclose(gnucmd) == -1)
#elif defined(unix) || defined(__unix) || defined(__unix__) || defined(__APPLE__)
if (pclose(gnucmd) == -1)
#endif
{ std::cerr << "Gnuplot::~Gnuplot: Problem closing communication to gnuplot" << std::endl; }
}
//------------------------------------------------------------------------------
//
// Resets a gnuplot session (next plot will erase previous ones)
//
Gnuplot& Gnuplot::reset_plot(void)
{
// remove_tmpfiles();
nplots = 0;
return *this;
}
//------------------------------------------------------------------------------
//
// resets a gnuplot session and sets all variables to default
//
Gnuplot& Gnuplot::reset_all(void)
{
// remove_tmpfiles();
nplots = 0;
(void)cmd("reset");
(void)cmd("clear");
pstyle = "points";
smooth.clear();
showonscreen();
return *this;
}
//------------------------------------------------------------------------------
//
// Change the plotting style of a gnuplot session
//
Gnuplot& Gnuplot::set_style(const std::string &stylestr)
{
if( (pstyle != stylestr) && !stylestr.empty() )
{
pstyle = stylestr;
}
return *this;
}
//------------------------------------------------------------------------------
//
// smooth: interpolation and approximation of data
//
Gnuplot& Gnuplot::set_smooth(const std::string &stylestr)
{
if (stylestr.find("unique") == std::string::npos &&
stylestr.find("frequency") == std::string::npos &&
stylestr.find("csplines") == std::string::npos &&
stylestr.find("bezier") == std::string::npos )
{
smooth.clear();
}
else
{
smooth = stylestr;
}
return *this;
}
//------------------------------------------------------------------------------
//
// sets terminal type to windows / x11
//
Gnuplot& Gnuplot::showonscreen(void)
{
(void)cmd("set output");
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