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<?php

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

 // File:        JPGRAPH_ERROR.PHP

 // Description: Error plot extension for JpGraph

 // Created:     2001-01-08

 // Ver:         $Id: jpgraph_error.php 1106 2009-02-22 20:16:35Z ljp $

 //

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

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

 */

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

// CLASS ErrorPlot

// Description: Error plot with min/max value for

// each datapoint

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

class ErrorPlot extends Plot {

    private $errwidth=2;

    //---------------

    // CONSTRUCTOR

    function __construct($datay,$datax=false) {

        parent::__construct($datay,$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 {

    public $line=null;

    //---------------

    // CONSTRUCTOR

    function __construct($datay,$datax=false) {

        parent::__construct($datay,$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 {

    public $line=null;

    //---------------

    // CONSTRUCTOR

    // Data is (val, errdeltamin, errdeltamax)

    function __construct($datay,$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];

        }

        parent::__construct($ey,$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 */

?>