Difference between revisions of "Gnuplot in cpp"
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| − | # You should download gnuplot-cpp library. I suggest you to use my version | + | # You should download gnuplot-cpp library. I suggest you to use my version [[Media: Gnuplot-cpp_modified.zip]] because the official one [http://code.google.com/p/gnuplot-cpp/ gnuplot-cpp] has problems, (see below). |
#To use the plotting library you should only need to include: "gnuplot-cpp/gnuplot_i.hpp" | #To use the plotting library you should only need to include: "gnuplot-cpp/gnuplot_i.hpp" | ||
# A code snippet is here presented that simply plots a 2D set of points: | # A code snippet is here presented that simply plots a 2D set of points: | ||
| Line 20: | Line 20: | ||
if(ANIMATIONON){ | if(ANIMATIONON){ | ||
// GNUPLOT | // GNUPLOT | ||
| − | |||
// GNUPLOT INITIALIZATION | // GNUPLOT INITIALIZATION | ||
Gnuplot gp("My plot"); | Gnuplot gp("My plot"); | ||
| Line 26: | Line 25: | ||
// END GNUPLOT INITIALIZATION | // END GNUPLOT INITIALIZATION | ||
try { | try { | ||
| − | |||
gp.remove_tmpfiles(); // it is always better to do it | gp.remove_tmpfiles(); // it is always better to do it | ||
gp.reset_plot(); // delete the plot (like Matlab figure()) | gp.reset_plot(); // delete the plot (like Matlab figure()) | ||
| Line 38: | Line 36: | ||
{ | { | ||
cout << ge.what() << endl; | cout << ge.what() << endl; | ||
| − | + | } | |
| − | + | ||
} // END GNUPLOT | } // END GNUPLOT | ||
</code> | </code> | ||
| + | |||
| + | '''HOW IT WORKS''' | ||
| + | |||
| + | For what I understood, the program writes a temp file (/tmp) in GNU/Linux and use it to plot in the correct way using [http://www.gnuplot.info/ Gnuplot]. | ||
| + | |||
| + | '''PROBLEM OF THE OFFICIAL VERSION''' | ||
| + | |||
| + | Up to now (read the data of this post), the official package provided [http://code.google.com/p/gnuplot-cpp/ gnuplot-cpp] it has problems that deals with tempFiles. In many cases, for example in the destructor the function ''remove_tmpfiles()'' is commented. In this way many and many files are created in /tmp and after the max files limit is reached no other plots are created. Note that this could be useful if you want to save your points in a file for other processing. | ||
| + | Moreover a major problem is due to the wrong use of the header file. Some functions are not inline and global constats are defined. These cause linking problems when you include official "gnuplot-cpp/gnuplot_i.hpp" in more than one source files. | ||
Latest revision as of 14:11, 4 November 2009
How to plot using gnuplot in your C/C++ programs
This is a little guide that shows you how you can add a plotting function in your C/C++ program.
This approach has some advantages and disadvantages:
PROS - You don't need to write on files or similar and plot in a second moment through a Matlab/Octave/Gnuplot script
CONTRAS - You don't have all the potentiality of Matlab/Octave plotting even if you can program your plotting utilities
HOW TO
- You should download gnuplot-cpp library. I suggest you to use my version Media: Gnuplot-cpp_modified.zip because the official one gnuplot-cpp has problems, (see below).
- To use the plotting library you should only need to include: "gnuplot-cpp/gnuplot_i.hpp"
- A code snippet is here presented that simply plots a 2D set of points:
if(ANIMATIONON){
// GNUPLOT
// GNUPLOT INITIALIZATION
Gnuplot gp("My plot");
//std::vector<double> x,y; // this are the vector containing (x,y) points
// END GNUPLOT INITIALIZATION
try {
gp.remove_tmpfiles(); // it is always better to do it
gp.reset_plot(); // delete the plot (like Matlab figure())
cout << endl << endl << "*** user-defined lists of points (x,y)" << endl;
gp.set_grid();
gp.set_style("points").plot_xy(x,y,"user-defined points 2d");
//sleep(1);
//usleep(3e5);
}
catch (GnuplotException ge)
{
cout << ge.what() << endl;
}
} // END GNUPLOT
HOW IT WORKS
For what I understood, the program writes a temp file (/tmp) in GNU/Linux and use it to plot in the correct way using Gnuplot.
PROBLEM OF THE OFFICIAL VERSION
Up to now (read the data of this post), the official package provided gnuplot-cpp it has problems that deals with tempFiles. In many cases, for example in the destructor the function remove_tmpfiles() is commented. In this way many and many files are created in /tmp and after the max files limit is reached no other plots are created. Note that this could be useful if you want to save your points in a file for other processing. Moreover a major problem is due to the wrong use of the header file. Some functions are not inline and global constats are defined. These cause linking problems when you include official "gnuplot-cpp/gnuplot_i.hpp" in more than one source files.
