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<?php

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

// File: 	JPGRAPH_STOCK.PHP

// Description:	Stock plot extension for JpGraph

// Created: 	2003-01-27

// Author:	Johan Persson (johanp@aditus.nu)

// Ver:		$Id: jpgraph_stock.php,v 1.1 2004/06/15 10:13:19 jpm Exp $

//

// License:	This code is released under QPL

// Copyright (C) 2003 Johan Persson

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

*/

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

// CLASS StockPlot

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

class StockPlot extends Plot {

    var $iWidth=9;

    var $iEndLines=1;

    var $iStockColor1='white',$iStockColor2='darkred',$iStockColor3='darkred';

    var $iTupleSize = 4;

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

// CONSTRUCTOR

    function StockPlot(&$datay,$datax=false) {

	if( count($datay) % $this->iTupleSize ) {

	    JpGraphError::Raise('Data values for Stock charts must contain an even multiple of '.$this->iTupleSize.' data points.');

	}

	$this->Plot($datay,$datax);

	$this->numpoints /= $this->iTupleSize;

    }

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

// PUBLIC METHODS

    function SetColor($aColor,$aColor1='white',$aColor2='darkred',$aColor3='darkred') {

	$this->color = $aColor;

	$this->iStockColor1 = $aColor1;

	$this->iStockColor2 = $aColor2;

	$this->iStockColor3 = $aColor3;

    }

    function SetWidth($aWidth) {

	// Make sure it's odd

	$this->iWidth = 2*floor($aWidth/2)+1;

    }

    function HideEndLines($aHide=true) {

	$this->iEndLines = !$aHide;

    }

    // 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);

    }

    // Method description

    function Stroke($img,$xscale,$yscale) {

	$n=$this->numpoints;

	if( $this->center ) $n--;

	if( isset($this->coords[1]) ) {

	    if( count($this->coords[1])!=$n )

		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;

	$ts = $this->iTupleSize;

	$this->csimareas = '';

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

	    //If value is NULL, then don't draw a bar at all

 	    if ($this->coords[0][$i] === null) continue;

	    if( $exist_x ) $x=$this->coords[1][$i];

	    else $x=$i;

	    $xt = $xscale->Translate($x);

	    $neg = $this->coords[0][$i*4] > $this->coords[0][$i*$ts+1] ;

	    $yopen  = $yscale->Translate($this->coords[0][$i*$ts]);

	    $yclose = $yscale->Translate($this->coords[0][$i*$ts+1]);

	    $ymin   = $yscale->Translate($this->coords[0][$i*$ts+2]);

	    $ymax   = $yscale->Translate($this->coords[0][$i*$ts+3]);

	    $dx = floor($this->iWidth/2);

	    $xl = $xt - $dx;

	    $xr = $xt + $dx;

	    if( $neg )

		$img->SetColor($this->iStockColor3);

	    else

		$img->SetColor($this->iStockColor1);

	    $img->FilledRectangle($xl,$yopen,$xr,$yclose);

	    $img->SetLineWeight($this->weight);

	    if( $neg )

		$img->SetColor($this->iStockColor2);

	    else

		$img->SetColor($this->color);

	    $img->Rectangle($xl,$yopen,$xr,$yclose);

	    if( $yopen < $yclose ) {

		$ytop = $yopen ;

		$ybottom = $yclose ;

	    }

	    else {

		$ytop = $yclose ;

		$ybottom = $yopen ;

	    }

	    $img->SetColor($this->color);

	    $img->Line($xt,$ytop,$xt,$ymax);

	    $img->Line($xt,$ybottom,$xt,$ymin);

	    if( $this->iEndLines ) {

		$img->Line($xl,$ymax,$xr,$ymax);

		$img->Line($xl,$ymin,$xr,$ymin);

	    }

	    // A chance for subclasses to add things to the bar

	    // for data point i

	    $this->ModBox($img,$xscale,$yscale,$i,$xl,$xr,$neg);

	    // Setup image maps

	    if( !empty($this->csimtargets[$i]) ) {

		$this->csimareas.= '<area shape="rect" coords="'.

		    round($xl).','.round($ytop).','.

		    round($xr).','.round($ybottom).'" ';

		$this->csimareas .= ' href="'.$this->csimtargets[$i].'"';

		if( !empty($this->csimalts[$i]) ) {

		    $sval=$this->csimalts[$i];

		    $this->csimareas .= " alt=\"$sval\" title=\"$sval\" ";

		}

		$this->csimareas.= ">\n";

	    }

	}

	return true;

    }

    // A hook for subclasses to modify the plot

    function ModBox($img,$xscale,$yscale,$i,$xl,$xr,$neg) {}

} // Class

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

// CLASS BoxPlot

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

class BoxPlot extends StockPlot {

    var $iPColor='black',$iNColor='white';

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

	$this->iTupleSize=5;

	parent::StockPlot($datay,$datax);

    }

    function SetMedianColor($aPos,$aNeg) {

	$this->iPColor = $aPos;

	$this->iNColor = $aNeg;

    }

    function ModBox($img,$xscale,$yscale,$i,$xl,$xr,$neg) {

	if( $neg )

	    $img->SetColor($this->iNColor);

	else

	    $img->SetColor($this->iPColor);

	$y = $yscale->Translate($this->coords[0][$i*5+4]);

	$img->Line($xl,$y,$xr,$y);

    }

}

/* EOF */

?>