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<?php
/**
* A PHP Interface to GNU Plot
*
* Copyright (C) 2006 Liu Yi (Eric) <eric.liu.yi (at) gmail.com>
*
* Website : http://celeste.cn
*
* The main purpose of this program is to facilitate plotting with data
* generated from program. It is not a *Complete* interface to GNU Plot.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
**/
// change this if u need
//$GNUPLOT = 'C:\gnuplot\bin\pgnuplot.exe'; // for Windows
$GNUPLOT = "gnuplot"; // for linux
//$tempDir = 'C:\temp'; // somewhere we can store the temporary data files
$tempDir = './tmp'; // somewhere we can store the temporary data files
// DONT change the code below if you dont know what you are doing
$IDCounter = 0;
/**
* PGData is a general data unit for series plotting
*
* It can either be created from an external data file ( in this case, it is simply a wrapper to the file )
* or created with an empty list of entries ( You can append entries to the list ).
*
* Before it is plotted, if it is created in the 2nd way, it must have its data dumped into a file.
*
**/
class PGData {
// privaite variables
var $filename; // Name of the data file. Can be explicitly specified or automatically generated
var $DataList; // This is only useful when $filename is not specified
var $legend; // Title of the data you want to see on the graph
function PGData($legend = '') {
$this->legend = $legend;
}
/**
* static method to initialize a data object from an external data file
* the object is just a wrapper to the file
**/
function createFromFile($filename, $legend = '') {
$Data = new PGData($legend);
if (!file_exists($filename) || !is_readable($filename)) {
print "Error: $filename is not a readable datafile!\n";
return NULL;
}
$Data->filename = $filename;
return $Data;
}
function changeLegend( $legend ) { $this->legend = $legend; }
function addDataEntry( $entry ){
if (!$filename) $this->DataList[] = $entry;
else print "Error: Cannot add an entry into file content [ $this->filename ] !\n";
}
function dumpIntoFile( $filename='' ) {
if ($this->filename) { print "Error: Data file exists [ $this->filename ] !\n"; return; }
global $tempDir, $IDCounter;
if (!$filename) {
// generate a file name
$filename = $tempDir.'/data_'. ( $IDCounter++ ) .'.txt';
global $toRemove;
$toRemove[] = $filename;
}
$fp = fopen($filename, 'w');
foreach( $this->DataList as $entry ) fwrite($fp, implode("\t", $entry)."\n");
fclose($fp);
$this->filename = $filename; // no longer changeable
}
}
/**
* The main class to communicate with GNU Plot
* It opens a pipe to a GNU Plot process
*
* You can guess the idea from the names of the functions
* Some of the parameters are explained in the comments
**/
class GNUPlot {
// private variables
var $ph = NULL;
var $toRemove;
var $plot;
var $splot;
function GNUPlot() {
global $GNUPLOT;
$this->ph = popen($GNUPLOT, 'w');
$this->toRemove = array();
$this->plot = 'plot';
$this->splot = 'splot';
}
// You can tell from the name of the function.
function draw2DLine($x1,$y1, $x2, $y2)
{
$this->exe( "set arrow from $x1,$y1 to $x2,$y2 nohead\n" );
}
function draw3DLine($x1,$y1,$z1, $x2, $y2,$z2)
{
$this->exe( "set arrow from $x1,$y1,$z1 to $x2,$y2,$z2 nohead\n" );
}
function draw2DArrow($x1,$y1, $x2, $y2)
{
$this->exe( "set arrow from $x1,$y1 to $x2,$y2 head\n" );
}
function draw3DArrow($x1,$y1,$z1, $x2, $y2,$z2)
{
$this->exe( "set arrow from $x1,$y1,$z1 to $x2,$y2,$z2 head\n" );
}
function set2DLabel($labeltext, $x, $y, $justify='', $pre='', $extra='' )
{
// $justify = {left | center | right}
// $pre = { first|second|graph|screen }
$this->exe( "set label \"". $labeltext ."\" at $pre $x,$y $extra\n");
}
function set3DLabel($labeltext, $x, $y, $z, $justify='', $pre='', $extra='' )
{
// $justify = {left | center | right}
// $pre = { first|second|graph|screen }
$this->exe( "set label \"". $labeltext ."\" at $pre $x,$y,$z $extra\n");
}
function setRange( $dimension, $min, $max, $extra='' ) {
// $dimension = x, y, z ......
if (!$dimension) $dimension = 'x';
$this->exe( "set ${dimension}range [$min:$max] $extra\n");
}
// low level set command
function set( $toSet ) {
$this->exe( "set $toSet\n");
}
function setTitle( $title, $extra='' ) {
$this->exe( "set title \"$title\" $extra\n");
}
// Set label for each axis
function setDimLabel( $dimension, $text, $extra='' ) {
// $dimension = x, y, z ......
$this->exe( "set ${dimension}label \"$text\" $extra\n");
}
function setTics( $dimension, $option ) {
// $dimension = x, y, z ......
$this->exe( "set ${dimension}tics $option \n" );
}
function setSize( $x, $y, $extra='' ) {
// $extra = {{no}square | ratio <r> | noratio}
$this->exe( "set size $extra $x,$y\n");
}
function plotData( &$PGData, $method, $using, $axis='', $extra='' ) {
/**
* This function is for 2D plotting
*
* $method is `lines`, `points`, `linespoints`, `impulses`, `dots`, `steps`, `fsteps`,
* `histeps`, errorbars, `xerrorbars`, `yerrorbars`, `xyerrorbars`, errorlines,
* `xerrorlines`, `yerrorlines`, `xyerrorlines`, `boxes`, `filledcurves`,
* `boxerrorbars`, `boxxyerrorbars`, `financebars`, `candlesticks`, `vectors` or pm3d
*
* $using is an expression controlling which data columns to use and how to use:
* Example : $using = " 1:2 " means plotting column 2 against column 1
* $using = " ($1):($2/2) " means use half of the value of column 2 to plot against column 1
* You can introduce in more than 2 or 3 columns to enable styles like errorbars
**/
$plot = $this->plot;
if (!$PGData->filename) $PGData->dumpIntoFile();
if (!$PGData->filename) { print "Error: Empty dataset!\n"; return; }
$fn = $PGData->filename;
$title = $PGData->legend;
if ($axis) $axis = " axis $axes ";
$this->exe( "$plot '$fn' using $using title \"$title\" with $method $axis $extra\n");
//print "$plot '$fn' using $using title \"$title\" with $method $axis $extra\n";
$this->plot = 'replot';
}
function splotData( &$PGData, $method, $using, $extra = '' ) {
/**
* This function is for 3D plotting
*
*/
$splot = $this->splot;
if (!$PGData->filename) $PGData->dumpIntoFile();
if (!$PGData->filename) { print "Error: Empty dataset!\n"; return; }
$fn = $PGData->filename;
$title = $PGData->legend;
$this->exe( "$splot '$fn' using $using title \"$title\" with $method $extra\n");
$this->splot = 'replot';
}
function export( $pic_filename ) {
/**
* export to $pic_filename
* the file ext can be png, ps or eps
*/
if (preg_match("/\.png$/", $pic_filename)) $this->exe("set term png\n");
elseif (preg_match("/\.e?ps$/", $pic_filename)) $this->exe( "set term postscript\n");
// you can add more options here to support other formats
else { $this->exe( "set term png\n"); $pic_filename.=".png"; }
$this->exe( "set output \"$pic_filename\"\n");
$this->exe( "replot\n" );
}
function reset() {
/**
* It is not a good idea to use this function in your program
*/
$this->exe( "reset\n" );
$this->plot = 'plot';
$this->splot = 'splot';
}
function close() {
flush($this->ph);
pclose($this->ph);
//sleep(count($this->toRemove) ); // allow gnu plot to finish so that we can safely remove the data files
//foreach($this->toRemove as $filename) unlink($filename);
}
function exe( $command ) {
fwrite($this->ph, $command);
}
}
// in case you are using old PHP. just in case
if (!function_exists('file_put_contents')) {
function file_put_contents( $fn, $contents ) {
$fp = fopen($fn, 'w');
fwrite($fp, $contents);
fclose($fp);
}
}
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