Jpgraph Error.php:
<?php
/*=======================================================================
// File: JPGRAPH_ERROR.PHP
// Description: Error plot extension for JpGraph
// Created: 2001-01-08
// Author: Johan Persson (johanp <at> aditus <dot> nu)
// Ver: $Id: jpgraph_error.php, v 1.15 2003/01/30 23:11:28 aditus Exp $
//
// License: This code is released under QPL
// Copyright (C) 2001, 2002 Johan Persson
//========================================================================
*/
//===================================================
// CLASS ErrorPlot
// Description: Error plot with min/max value for
// each datapoint
//===================================================
class ErrorPlot extends Plot {
var $errwidth=2;
//---------------
// CONSTRUCTOR
function ErrorPlot(&$datay, $datax=false) {
$this->Plot($datay, $datax);
$this->numpoints /= 2;
}
//---------------
// PUBLIC METHODS
// Gets called before any axis are stroked
function PreStrokeAdjust(&$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);
if( isset($this->coords[1]) ) {
if( count($this->coords[1])!=$numpoints )
JpGraphError::Raise("Number of X and Y points are not equal. Number of X-points:".count($this->coords[1])." Number of Y-points:$numpoints");
else
$exist_x = true;
}
else
$exist_x = false;
if( $exist_x )
$xs=$this->coords[1][0];
else
$xs=0;
for( $i=0; $i<$numpoints; ++$i) {
if( $exist_x ) $x=$this->coords[1][$i];
else $x=$i;
$xt = $xscale->Translate($x);
$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
// THIS IS A DEPRECATED PLOT TYPE JUST KEPT FOR
// BACKWARD COMPATIBILITY
//===================================================
class ErrorLinePlot extends ErrorPlot {
var $line=null;
//---------------
// CONSTRUCTOR
function ErrorLinePlot(&$datay, $datax=false) {
$this->ErrorPlot($datay, $datax);
// Calculate line coordinates as the average of the error limits
for($i=0; $i < count($datay); $i+=2 ) {
$ly[]=($datay[$i]+$datay[$i+1])/2;
}
$this->line=new LinePlot($ly, $datax);
}
//---------------
// PUBLIC METHODS
function Legend(&$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
//===================================================
// CLASS LineErrorPlot
// Description: Combine a line and error plot
//===================================================
class LineErrorPlot extends ErrorPlot {
var $line=null;
//---------------
// CONSTRUCTOR
// Data is (val, errdeltamin, errdeltamax)
function LineErrorPlot(&$datay, $datax=false) {
$ly=array(); $ey=array();
$n = count($datay);
if( $n % 3 != 0 ) {
JpGraphError::Raise('Error in input data to LineErrorPlot.'.
'Number of data points must be a multiple of 3');
}
for($i=0; $i < count($datay); $i+=3 ) {
$ly[]=$datay[$i];
$ey[]=$datay[$i]+$datay[$i+1];
$ey[]=$datay[$i]+$datay[$i+2];
}
$this->ErrorPlot($ey);
$this->line=new LinePlot($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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