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Viewing file:     jpgraph_stock.php (4.91 KB)      -rw-r--r--

<?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 41 2005-06-06 10:46:10Z ljp $
//
// Copyright (c) Aditus Consulting. All rights reserved.
//========================================================================
*/

//===================================================
// CLASS StockPlot
//===================================================
class StockPlot extends Plot {
    var $iTupleSize = 4;
    var $iWidth=9;
    var $iEndLines=1;
    var $iStockColor1='white',$iStockColor2='darkred',$iStockColor3='darkred';
//---------------
// CONSTRUCTOR
    function StockPlot(&$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*$ts] > $this->coords[0][$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];
		    $this->csimareas .= " title=\"$sval\" ";
		}
		$this->csimareas.= " alt=\"$sval\" />\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 */
?>