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<?php
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/*=======================================================================
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// File: JPGRAPH_ERROR.PHP
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// Description: Error plot extension for JpGraph
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// Created: 2001-01-08
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// Author: Johan Persson (johanp@aditus.nu)
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// Ver: $Id: jpgraph_error.php,v 1.1 2004/06/15 10:13:19 jpm Exp $
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//
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// License: This code is released under QPL
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// Copyright (C) 2001,2002 Johan Persson
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//========================================================================
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*/
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//===================================================
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// CLASS ErrorPlot
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// Description: Error plot with min/max value for
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// each datapoint
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//===================================================
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class ErrorPlot extends Plot {
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var $errwidth=2;
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//---------------
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// CONSTRUCTOR
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function ErrorPlot(&$datay,$datax=false) {
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$this->Plot($datay,$datax);
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$this->numpoints /= 2;
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}
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//---------------
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// PUBLIC METHODS
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// Gets called before any axis are stroked
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function PreStrokeAdjust(&$graph) {
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if( $this->center ) {
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$a=0.5; $b=0.5;
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++$this->numpoints;
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} else {
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$a=0; $b=0;
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}
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$graph->xaxis->scale->ticks->SetXLabelOffset($a);
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$graph->SetTextScaleOff($b);
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//$graph->xaxis->scale->ticks->SupressMinorTickMarks();
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}
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// Method description
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function Stroke(&$img,&$xscale,&$yscale) {
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$numpoints=count($this->coords[0])/2;
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$img->SetColor($this->color);
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$img->SetLineWeight($this->weight);
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if( isset($this->coords[1]) ) {
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if( count($this->coords[1])!=$numpoints )
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JpGraphError::Raise("Number of X and Y points are not equal. Number of X-points:".count($this->coords[1])." Number of Y-points:$numpoints");
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else
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$exist_x = true;
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}
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else
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$exist_x = false;
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if( $exist_x )
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$xs=$this->coords[1][0];
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else
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$xs=0;
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for( $i=0; $i<$numpoints; ++$i) {
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if( $exist_x ) $x=$this->coords[1][$i];
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else $x=$i;
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$xt = $xscale->Translate($x);
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$yt1 = $yscale->Translate($this->coords[0][$i*2]);
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$yt2 = $yscale->Translate($this->coords[0][$i*2+1]);
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$img->Line($xt,$yt1,$xt,$yt2);
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$img->Line($xt-$this->errwidth,$yt1,$xt+$this->errwidth,$yt1);
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$img->Line($xt-$this->errwidth,$yt2,$xt+$this->errwidth,$yt2);
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}
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return true;
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}
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} // Class
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//===================================================
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// CLASS ErrorLinePlot
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// Description: Combine a line and error plot
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// THIS IS A DEPRECATED PLOT TYPE JUST KEPT FOR
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// BACKWARD COMPATIBILITY
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//===================================================
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class ErrorLinePlot extends ErrorPlot {
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var $line=null;
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//---------------
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// CONSTRUCTOR
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function ErrorLinePlot(&$datay,$datax=false) {
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$this->ErrorPlot($datay,$datax);
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// Calculate line coordinates as the average of the error limits
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for($i=0; $i < count($datay); $i+=2 ) {
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$ly[]=($datay[$i]+$datay[$i+1])/2;
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}
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$this->line=new LinePlot($ly,$datax);
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}
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//---------------
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// PUBLIC METHODS
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function Legend(&$graph) {
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if( $this->legend != "" )
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$graph->legend->Add($this->legend,$this->color);
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$this->line->Legend($graph);
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}
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function Stroke(&$img,&$xscale,&$yscale) {
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parent::Stroke($img,$xscale,$yscale);
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$this->line->Stroke($img,$xscale,$yscale);
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}
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} // Class
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//===================================================
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// CLASS LineErrorPlot
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// Description: Combine a line and error plot
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//===================================================
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class LineErrorPlot extends ErrorPlot {
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var $line=null;
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//---------------
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// CONSTRUCTOR
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// Data is (val, errdeltamin, errdeltamax)
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function LineErrorPlot(&$datay,$datax=false) {
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$ly=array(); $ey=array();
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$n = count($datay);
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if( $n % 3 != 0 ) {
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JpGraphError::Raise('Error in input data to LineErrorPlot.'.
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'Number of data points must be a multiple of 3');
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}
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for($i=0; $i < count($datay); $i+=3 ) {
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$ly[]=$datay[$i];
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$ey[]=$datay[$i]+$datay[$i+1];
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$ey[]=$datay[$i]+$datay[$i+2];
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}
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$this->ErrorPlot($ey,$datax);
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$this->line=new LinePlot($ly,$datax);
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}
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//---------------
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// PUBLIC METHODS
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function Legend(&$graph) {
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if( $this->legend != "" )
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$graph->legend->Add($this->legend,$this->color);
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$this->line->Legend($graph);
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}
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function Stroke(&$img,&$xscale,&$yscale) {
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parent::Stroke($img,$xscale,$yscale);
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$this->line->Stroke($img,$xscale,$yscale);
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}
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} // Class
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/* EOF */
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?>
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