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<?php

/*=======================================================================

// File: 	JPGRAPH_ERROR.PHP

// Description:	Error plot extension for JpGraph

// Created: 	2001-01-08

// Ver:		$Id: jpgraph_error.php 782 2006-10-08 08:09:02Z ljp $

//

// Copyright (c) Aditus Consulting. All rights reserved.

//========================================================================

*/

//===================================================

// 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::RaiseL(2003,count($this->coords[1]),$numpoints);

//("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;

	for( $i=0; $i<$numpoints; ++$i) {

	    if( $exist_x )

		$x=$this->coords[1][$i];

	    else

		$x=$i;

	    if( !is_numeric($x) ||

		!is_numeric($this->coords[0][$i*2]) || !is_numeric($this->coords[0][$i*2+1]) ) {

		continue;

	    }

	    $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

	$n = count($datay);

	for($i=0; $i < $n; $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::RaiseL(4002);

//('Error in input data to LineErrorPlot. Number of data points must be a multiple of 3');

	}

	for($i=0; $i < $n; $i+=3 ) {

	    $ly[]=$datay[$i];

	    $ey[]=$datay[$i]+$datay[$i+1];

	    $ey[]=$datay[$i]+$datay[$i+2];

	}

	$this->ErrorPlot($ey,$datax);

	$this->line=new LinePlot($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

/* EOF */

?>