/usr/share/jpgraph/jpgraph_error.php is in libphp-jpgraph 1.5.2-12.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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/*=======================================================================
// File: JPGRAPH_ERROR.PHP
// Description: Error plot extension for JpGraph
// Created: 2001-01-08
// Author: Johan Persson (johanp@aditus.nu)
// Ver: $Id: jpgraph_error.php,v 1.8 2002/01/15 18:55:22 aditus Exp $
//
// License: This code is released under GPL 2.0
// Copyright (C) 2001 Johan Persson
//========================================================================
*/
//===================================================
// CLASS ErrorPlot
// Description: Error plot with min/max value for
// each datapoint
//===================================================
class ErrorPlot extends Plot {
var $errwidth=2;
var $center=false;
//---------------
// CONSTRUCTOR
function ErrorPlot(&$datay,$datax=false) {
$this->Plot($datay,$datax);
$this->numpoints /= 2;
}
//---------------
// PUBLIC METHODS
function SetCenter($c=true) {
$this->center=$c;
}
// Gets called before any axis are stroked
function PreStrokeAdjust(&$graph) {
if( $this->center ) {
$a=0.5; $b=0.5;
++$this->numpoints;
} else {
$a=0; $b=0;
}
$graph->xaxis->scale->ticks->SetXLabelOffset($a);
$graph->SetTextScaleOff($b);
$graph->xaxis->scale->ticks->SupressMinorTickMarks();
}
// Method description
function Stroke(&$img,&$xscale,&$yscale) {
$numpoints=count($this->coords[0])/2;
$img->SetColor($this->color);
$img->SetLineWeight($this->weight);
for( $i=0; $i<$numpoints; ++$i) {
$xt = $xscale->Translate($i);
$yt1 = $yscale->Translate($this->coords[0][$i*2]);
$yt2 = $yscale->Translate($this->coords[0][$i*2+1]);
$img->Line($xt,$yt1,$xt,$yt2);
$img->Line($xt-$this->errwidth,$yt1,$xt+$this->errwidth,$yt1);
$img->Line($xt-$this->errwidth,$yt2,$xt+$this->errwidth,$yt2);
}
return true;
}
} // Class
//===================================================
// CLASS ErrorLinePlot
// Description: Combine a line and error plot
//===================================================
class ErrorLinePlot extends ErrorPlot {
var $line=null;
//---------------
// CONSTRUCTOR
function ErrorLinePlot(&$datay,$datax=false) {
$this->ErrorPlot($datay);
// Calculate line coordinates as the average of the error limits
for($i=0; $i<count($datay); $i+=2 ) {
$ly[]=($datay[$i]+$datay[$i+1])/2;
}
$this->line=new LinePlot($ly);
}
//---------------
// PUBLIC METHODS
function Legend(&$graph) {
if( $this->legend != "" )
$graph->legend->Add($this->legend,$this->color);
$this->line->Legend($graph);
}
function Stroke(&$img,&$xscale,&$yscale) {
parent::Stroke($img,$xscale,$yscale);
$this->line->Stroke($img,$xscale,$yscale);
}
} // Class
/* EOF */
?>
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