README

A PHP Library for using GnuPlot

WARNING: This invoke the gnuplot command line as back-end, which can lead to arbitrary code execution. Be careful if you intend to use this library with user-provided information. Have a look at this post for more information.

This is the output of the demo/write.php:

Requirements

You need to have a server with gnuplot installed and the safe mode disabled (to be able to run proc_open())

Usage

There is examples in the demo/ directory.

You can create a graph and populate it like this:

<?php

use Gregwar\GnuPlot\GnuPlot;

$plot = new GnuPlot;

// Setting the main graph title
$plot->setGraphTitle('Demo graph');

// Adding three points to the first curve
$plot
    ->setTitle(0, 'The first curve')
    ->push(0, 4)
    ->push(1, 5)
    ->push(2, 6)
    ;

// Adding three points on the other curve
// (with index 1)
$plot
    ->setTitle(1, 'The first curve')
    ->push(0, 8, 1)
    ->push(1, 9, 1)
    ->push(2, 10, 2)
    ;

You can then save it to a file, have a look to write.php for example:

<?php

// Write the graph to out.png
$plot->writePng('out.png');

Or render it directly into a browser, you can try out.php for example:

<?php

header('Content-type: image/png');
echo $plot->get();

Or display it on the screen (useful with CLI scripts), run the demo.php script for example:

<?php

$plot->display();

Or display it, and re-feed it in real time (with CLI scripts), you can run realTime.php for example:

<?php

$plot->refresh();

API

• push($x, $y, $index=0), add a point to the $index-nth curve
• display(), renders the graph on the screen (asuming you are using it as a CLI with an X Server
• refresh(), same as display(), but will replot the graph after the first call
• get(), gets the PNG data for your image
• writePng($filename), write the data to the output file
• setTitle($index, $title), sets the title of the $index-nt curve
• setGraphTitle($title), sets the main title for the graph
• setXTimeFormat($format), sets the X axis as a time axis and specify data format
• setXTimeFormatString($format), specify the X axis time presentation format
• setXLabel($text), sets the label for the X axis
• setYLabel($text), sets the label for the Y axis
• setYFormat($format), sets Y axis formatting
• setXRange($min, $max), set the X min & max
• setYRange($min, $max), set the Y min & max
• setWidth($width), sets the width of the graph
• setHeight($height), sets the width of the graph
• addLabel($x, $y, $text), add some label at a point

License

Gregwar\GnuPlot is under MIT license