File: jpgraph_bar.php

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<?php
/*=======================================================================
// File:	JPGRAPH_BAR.PHP
// Description:	Bar plot extension for JpGraph
// Created: 	2001-01-08
// Author:	Johan Persson (johanp@aditus.nu)
// Ver:		$Id: jpgraph_bar.php,v 1.22 2002/03/01 00:30:46 aditus Exp $
//
// License:	This code is released under QPL
// Copyright (C) 2001 Johan Persson
//========================================================================
*/

//===================================================
// CLASS Gradient
// Description: Handles gradient fills. This is to be
// considered a "friend" class of Class Image. The
// Gradient takes care of production a gradient fill for
// the bars.
//===================================================
class Gradient {
    var $img=null;
//---------------
// CONSTRUCTOR
    function Gradient(&$img) {
	$this->img = $img;
    }

//---------------
// PUBLIC METHODS	
    // Produce a gradient filled rectangle with a smooth transition between
    // two colors.
    // ($xl,$yt) 	Top left corner
    // ($xr,$yb)	Bottom right
    // $from_color	Starting color in gradient
    // $to_color	End color in the gradient
    // $style		Which way is the gradient oriented?
    function FilledRectangle($xl,$yt,$xr,$yb,$from_color,$to_color,$style=1) {
	switch( $style ) {	
	    case 1:  // HORIZONTAL
		$steps = abs($xr-$xl);
	    $delta = $xr>=$xl ? 1 : -1;
	    $this->GetColArray($from_color,$to_color,$steps,$colors);
	    for( $i=0, $x=$xl; $i<$steps; ++$i ) {
		$this->img->current_color = $colors[$i];
		$this->img->Line($x,$yt,$x,$yb);
		$x += $delta;
	    }
	    break;

	    case 2: // VERTICAL
		$steps = abs($yb-$yt);
	    $delta = $yb>=$yt ? 1 : -1;
	    $this->GetColArray($from_color,$to_color,$steps,$colors);
	    for($i=0,$y=$yt; $i<$steps; ++$i) {
		$this->img->current_color = $colors[$i];
		$this->img->Line($xl,$y,$xr,$y);
		$y += $delta;
	    }
	    break;

	    case 3: // VERTICAL FROM MIDDLE
		$steps = abs($yb-$yt)/2;
	    $delta = $yb>=$yt ? 1 : -1;
	    $this->GetColArray($from_color,$to_color,$steps,$colors);
	    for($y=$yt, $i=0; $i<$steps;  ++$i) {
		$this->img->current_color = $colors[$i];
		$this->img->Line($xl,$y,$xr,$y);
		$y += $delta;
	    }
	    --$i;
	    for($j=0; $j<$steps; ++$j, --$i) {
		$this->img->current_color = $colors[$i];
		$this->img->Line($xl,$y,$xr,$y);
		$y += $delta;
	    }
	    $this->img->Line($xl,$y,$xr,$y);
	    break;

	    case 4: // HORIZONTAL FROM MIDDLE
		$steps = abs($xr-$xl)/2;
	    $delta = $xr>=$xl ? 1 : -1;
	    $this->GetColArray($from_color,$to_color,$steps,$colors);
	    for($x=$xl, $i=0; $i<$steps; ++$i) {
		$this->img->current_color = $colors[$i];
		$this->img->Line($x,$yb,$x,$yt);
		$x += $delta;
	    }
	    --$i;
	    for($j=0; $j<$steps; ++$j, --$i) {
		$this->img->current_color = $colors[$i];
		$this->img->Line($x,$yb,$x,$yt);
		$x += $delta;
	    }
	    $this->img->Line($x,$yb,$x,$yt);		
	    break;

	    case 6: // HORIZONTAL WIDER MIDDLE
		$steps = abs($xr-$xl)/3;
	    $delta = $xr>=$xl ? 1 : -1;
	    $this->GetColArray($from_color,$to_color,$steps,$colors);
	    for($x=$xl, $i=0; $i<$steps; ++$i) {
		$this->img->current_color = $colors[$i];
		$this->img->Line($x,$yb,$x,$yt);
		$x += $delta;
	    }
	    --$i;
	    $this->img->current_color = $colors[$i];
	    for($j=0; $j< $steps; ++$j) {
		$this->img->Line($x,$yb,$x,$yt);
		$x += $delta;
	    }

	    for($j=0; $j<$steps; ++$j, --$i) {
		$this->img->current_color = $colors[$i];				
		$this->img->Line($x,$yb,$x,$yt);	
		$x += $delta;
	    }				
	    break;

	    case 7: // VERTICAL WIDER MIDDLE
		$steps = abs($yb-$yt)/3;
	    $delta = $yb>=$yt? 1 : -1;
	    $this->GetColArray($from_color,$to_color,$steps,$colors);
	    for($y=$yt, $i=0; $i<$steps;  ++$i) {
		$this->img->current_color = $colors[$i];
		$this->img->Line($xl,$y,$xr,$y);
		$y += $delta;
	    }
	    --$i;
	    $this->img->current_color = $colors[$i];
	    for($j=0; $j< $steps; ++$j) {
		$this->img->Line($xl,$y,$xr,$y);
		$y += $delta;
	    }
	    for($j=0; $j<$steps; ++$j, --$i) {
		$this->img->current_color = $colors[$i];				
		$this->img->Line($xl,$y,$xr,$y);
		$y += $delta;
	    }				
	    break;

	    case 5: // Rectangle
		$steps = floor(min(($yb-$yt)+1,($xr-$xl)+1)/2);	
	    $this->GetColArray($from_color,$to_color,$steps,$colors);
	    $dx = ($xr-$xl)/2;
	    $dy = ($yb-$yt)/2;
	    $x=$xl;$y=$yt;$x2=$xr;$y2=$yb;
	    for($x=$xl, $i=0; $x<$xl+$dx && $y<$yt+$dy ; ++$x, ++$y, --$x2, --$y2, ++$i) {
		assert($i<count($colors));
		$this->img->current_color = $colors[$i];			
		$this->img->Rectangle($x,$y,$x2,$y2);
	    }
	    $this->img->Line($x,$y,$x2,$y2);
	    break;

	    default:
		die("JpGraph Error: Unknown gradient style (=$style).");
		break;
	}
    }

//---------------
// PRIVATE METHODS	
    // Add to the image color map the necessary colors to do the transition
    // between the two colors using $numcolors intermediate colors
    function GetColArray($from_color,$to_color,$arr_size,&$colors,$numcols=100) {
	if( $arr_size==0 ) return;
	// If color is give as text get it's corresponding r,g,b values
	$from_color = $this->img->rgb->Color($from_color);
	$to_color = $this->img->rgb->Color($to_color);
		
	$rdelta=($to_color[0]-$from_color[0])/$numcols;
	$gdelta=($to_color[1]-$from_color[1])/$numcols;
	$bdelta=($to_color[2]-$from_color[2])/$numcols;
	$stepspercolor	= $numcols/$arr_size;
	$prevcolnum	= -1;
	for ($i=0; $i<$arr_size; ++$i) {
	    $colnum	= floor($stepspercolor*$i);
	    if ( $colnum == $prevcolnum ) 
		$colors[$i]	= $colidx;
	    else {
		$r = floor($from_color[0] + $colnum*$rdelta);
		$g = floor($from_color[1] + $colnum*$gdelta);
		$b = floor($from_color[2] + $colnum*$bdelta);
		$colidx = $this->img->rgb->Allocate(sprintf("#%02x%02x%02x",$r,$g,$b));
		$colors[$i]	= $colidx;
	    }
	    $prevcolnum = $colnum;
	}
    }	
} // Class


//===================================================
// CLASS BarPlot
// Description: Main code to produce a bar plot 
//===================================================
class BarPlot extends Plot {
    var $width=0.4; // in percent of major ticks
    var $abswidth=-1; // Width in absolute pixels
    var $fill_color="lightblue"; // Default is to fill with light blue
    var $ybase=0; // Bars start at 0 
    var $align="left";
    var $grad=false,$grad_style=1;
    var $grad_fromcolor=array(50,50,200),$grad_tocolor=array(255,255,255);
    var $bar_shadow=false;
    var $bar_shadow_color="black";
    var $bar_shadow_hsize=3,$bar_shadow_vsize=3;	
    var $show_value=false,$show_value_format="%d",$show_value_angle=0;
    var $show_value_ff=FF_FONT1,$show_value_fs=FS_NORMAL,$show_value_fsize=12;
    var $show_value_color="black",$show_value_margin=3;
	
//---------------
// CONSTRUCTOR
    function BarPlot(&$datay,$datax=false) {
	$this->Plot($datay,$datax);		
	++$this->numpoints;
    }

//---------------
// PUBLIC METHODS	
	
    // Set a drop shadow for the bar (or rather an "up-right" shadow)
    function SetShadow($color="black",$hsize=3,$vsize=3) {
	$this->bar_shadow=true;
	$this->bar_shadow_color=$color;
	$this->bar_shadow_vsize=$vsize;
	$this->bar_shadow_hsize=$hsize;
		
	// Adjust the value margin to compensate for shadow
	$this->show_value_margin += $vsize;
    }
	
    // Display the value of the bar at the top of bar
    function ShowValue($f=true) {
	$this->show_value = $f;	
    }
	
    function SetValueFormat($format="%d",$angle=0) {
	$this->show_value_format = $format;
	$this->show_value_angle = $angle;
    }
	
    function SetValueFont($ff=FF_FONT1,$fs=FS_NORMAL,$size=10) {
	$this->show_value_ff=$ff;
	$this->show_value_fs=$fs;
	$this->show_value_fsize=$size;
    }
	
    function SetValueColor($color) {
	$this->show_value_color=$color;
    }
	
    function SetValueMargin($m) {
	$this->show_value_margin=$m;
    }

    function SetYStart($y) {	
	die("JpGraph Error: Deprecated function SetYStart. Use SetYMin() instead.");
    }
	
    // DEPRECATED use SetYBase instead
    function SetYMin($y) {
	$this->ybase=$y;
    }

    //
    function SetYBase($y) {
	$this->ybase=$y;
    }
	
    function Legend(&$graph) {
	if( $this->fill_color && $this->legend!="" ) {
	    if( is_array($this->fill_color) )
		$graph->legend->Add($this->legend,$this->fill_color[0]);		
	    else
		$graph->legend->Add($this->legend,$this->fill_color);		
	}
    }

    // Gets called before any axis are stroked
    function PreStrokeAdjust(&$graph) {
	parent::PreStrokeAdjust($graph);
		
	// For a "text" X-axis scale we will adjust the
	// display of the bars a little bit.
	if( substr($graph->axtype,0,3)=="tex" ) {
	    // Position the ticks between the bars
	    $graph->xaxis->scale->ticks->SetXLabelOffset(0.5,0);
		
	    // Position the labels under each bar in the middle of the
	    // major steps.
	    $graph->SetTextScaleOff(0.5-$this->width/2);						
	}
	else {
	    // We only set an absolute width for linear and int scale
	    // for text scale the width will be set to a fraction of
	    // the majstep width.
	    if( $this->abswidth == -1 ) // Not set
				// set width to a visuable sensible default
		$this->abswidth = $graph->img->plotwidth/(2*count($this->coords[0]));
	}
    }

    function Min() {
	$m = parent::Min();
	if( $m[1] >= $this->ybase )
	    $m[1] = $this->ybase;
	return $m;	
    }

    function Max() {
	$m = parent::Max();
	if( $m[1] <= $this->ybase )
	    $m[1] = $this->ybase;
	return $m;	
    }	
	
    // Specify width as fractions of the major stepo size
    function SetWidth($w) {
	assert($w > 0 && $w <= 1.0);
	$this->width=$w;
    }
	
    // Specify width in absolute pixels. If specified this
    // overrides SetWidth()
    function SetAbsWidth($w) {
	$this->abswidth=$w;
    }
		
    function SetAlign($a) {
	$this->align=$a;
    }
	
    function SetNoFill() {
	$this->grad = false;
	$this->fill_color=false;
    }
		
    function SetFillColor($c) {
	$this->fill_color=$c;
    }
	
    function SetFillGradient($from_color,$to_color,$style) {
	$this->grad=true;
	$this->grad_fromcolor=$from_color;
	$this->grad_tocolor=$to_color;
	$this->grad_style=$style;
    }
	
    function Stroke(&$img,&$xscale,&$yscale) { 
		
	$numpoints = count($this->coords[0]);
	if( isset($this->coords[1]) ) {
	    if( count($this->coords[1])!=$numpoints )
		die("JpGraph Error: Number of X and Y points are not equal.<br>
					Number of X-points:".count($this->coords[1])."<br>
					Number of Y-points:$numpoints");
	    else
		$exist_x = true;
	}
	else 
	    $exist_x = false;
		
		
	$numbars=count($this->coords[0]);
	if( $yscale->scale[0] >= 0 )
	    $zp=$yscale->scale_abs[0]; 
	else
	    $zp=$yscale->Translate(0.0);
	
	if( $this->abswidth > -1 )
	    $abswidth=$this->abswidth;
	else
	    $abswidth=round($this->width*$xscale->scale_factor,0);
			
		
	for($i=0; $i<$numbars; $i++) {
	    if( $exist_x ) $x=$this->coords[1][$i];
	    else $x=$i;
			
	    $x=$xscale->Translate($x);
			
	    if($this->align=="center")
		$x -= $abswidth/2;
	    elseif($this->align=="right")
		$x -= $abswidth;			
	    $pts=array(
		$x,$zp,
		$x,$yscale->Translate($this->coords[0][$i]),
		$x+$abswidth,$yscale->Translate($this->coords[0][$i]),
		$x+$abswidth,$zp);
	    if( $this->grad ) {
		$grad = new Gradient($img);
		$grad->FilledRectangle($pts[2],$pts[3],
		$pts[6],$pts[7],
		$this->grad_fromcolor,$this->grad_tocolor,$this->grad_style);				
	    }
	    elseif( !empty($this->fill_color) ) {
		if(is_array($this->fill_color)) {
		    $img->PushColor($this->fill_color[$i % count($this->fill_color)]);
		} else {
		    $img->PushColor($this->fill_color);
		}
		$img->FilledPolygon($pts);
		$img->PopColor();
	    }
			
	    // Remember value of this bar
	    $val=$this->coords[0][$i];
			
	    if( $this->bar_shadow && $val != 0 ) {
		$ssh = $this->bar_shadow_hsize;
		$ssv = $this->bar_shadow_vsize;
				// Create points to create a "upper-right" shadow
		if( $val > 0 ) {
		    $sp[0]=$pts[6];		$sp[1]=$pts[7];
		    $sp[2]=$pts[4];		$sp[3]=$pts[5];
		    $sp[4]=$pts[2];		$sp[5]=$pts[3];
		    $sp[6]=$pts[2]+$ssh;	$sp[7]=$pts[3]-$ssv;
		    $sp[8]=$pts[4]+$ssh;	$sp[9]=$pts[5]-$ssv;
		    $sp[10]=$pts[6]+$ssh;	$sp[11]=$pts[7]-$ssv;
		} 
		elseif( $val < 0 ) {
		    $sp[0]=$pts[4];		$sp[1]=$pts[5];
		    $sp[2]=$pts[6];		$sp[3]=$pts[7];
		    $sp[4]=$pts[0];	$sp[5]=$pts[1];
		    $sp[6]=$pts[0]+$ssh;	$sp[7]=$pts[1]-$ssv;
		    $sp[8]=$pts[6]+$ssh;	$sp[9]=$pts[7]-$ssv;
		    $sp[10]=$pts[4]+$ssh;	$sp[11]=$pts[5]-$ssv;
		}
				
		$img->PushColor($this->bar_shadow_color);
		$img->FilledPolygon($sp);
		$img->PopColor();
	    }
			
	    // Stroke the outline of the bar
	    if( is_array($this->color) )
		$img->SetColor($this->color[$i % count($this->color)]);
	    else
		$img->SetColor($this->color);
	    $img->SetLineWeight($this->weight);
	    $img->Polygon($pts);
					
	    if( $this->show_value) {
		$sval=sprintf($this->show_value_format,$val);
		$txt = new Text($sval);
		$txt->SetFont($this->show_value_ff,$this->show_value_fs,$this->show_value_fsize);
		$txt->SetColor($this->show_value_color);
		$x=$pts[2]+($pts[4]-$pts[2])/2;
		if($this->bar_shadow)
		    $x += $ssh;
				
		if( $val >= 0 ) {
		    $txt->Pos($x,$pts[3]-$this->show_value_margin);
		    $txt->Align("center","bottom");
		}
		else {
		    $txt->Pos($x,$pts[3]+$this->show_value_margin);
		    $txt->Align("center","top");
		}
		$txt->SetOrientation($this->show_value_angle);
		$txt->Stroke($img);			
	    }
			
	    // Create the client side image map
	    $this->csimareas.= "<area shape=\"rect\" coords=\"";
	    // Hmmm, this is fishy.  Fixes a bug in Opera whereby if Y2<Y1 or X2<X1 the csim doesn't work
	    if ($pts[3] < $pts[7]) {
		if ($pts[2] < $pts[6]) 
		    $this->csimareas .= "$pts[2], $pts[3], $pts[6], $pts[7]\"";
		else 
		    $this->csimareas .= "$pts[6], $pts[3], $pts[2], $pts[7]\"";
	    } else {
		if ($pts[2] < $pts[6]) 
		    $this->csimareas .= "$pts[2], $pts[7], $pts[6], $pts[3]\"";
		else 
		    $this->csimareas .= "$pts[6], $pts[7], $pts[2], $pts[3]\"";
	    }
	    if( !empty($this->csimtargets[$i]) )
		$this->csimareas .= " href=\"".$this->csimtargets[$i]."\"";
	    if( !empty($this->csimalts[$i]) ) {
		$sval=sprintf($this->csimalts[$i],$this->coords[0][$i]);
		$this->csimareas .= " alt=\"$sval\" title=\"$sval\" ";
	    }
	    $this->csimareas .= ">\r\n";
	}
	return true;
    }
} // Class

//===================================================
// CLASS GroupBarPlot
// Description: Produce grouped bar plots
//===================================================
class GroupBarPlot extends BarPlot {
    var $plots;
    var $width=0.7;
    var $nbrplots=0;
    var $numpoints;
//---------------
// CONSTRUCTOR
    function GroupBarPlot($plots) {
	$this->plots = $plots;
	$this->nbrplots = count($plots);
	$this->numpoints = $plots[0]->numpoints;
    }

//---------------
// PUBLIC METHODS	
    function Legend(&$graph) {
	$n = count($this->plots);
	for($i=0; $i<$n; ++$i)
	    $this->plots[$i]->Legend($graph);
    }
	
    function Min() {
	list($xmin,$ymin) = $this->plots[0]->Min();
	$n = count($this->plots);
	for($i=0; $i<$n; ++$i) {
	    list($xm,$ym) = $this->plots[$i]->Min();
	    $xmin = max($xmin,$xm);
	    $ymin = min($ymin,$ym);
	}
	return array($xmin,$ymin);		
    }
	
    function Max() {
	list($xmax,$ymax) = $this->plots[0]->Max();
	$n = count($this->plots);
	for($i=0; $i<$n; ++$i) {
	    list($xm,$ym) = $this->plots[$i]->Max();
	    $xmax = max($xmax,$xm);
	    $ymax = max($ymax,$ym);
	}
	return array($xmax,$ymax);
    }
	
    function GetCSIMareas() {
	$n = count($this->plots);
	for($i=0; $i<$n; ++$i) {
	    $csimareas.= $this->plots[$i]->csimareas;
	}
	return $csimareas;
    }
	
    // Stroke all the bars next to each other
    function Stroke(&$img,&$xscale,&$yscale) { 
	$tmp=$xscale->off;
	$n = count($this->plots);
	for( $i=0; $i<$n; ++$i ) {
	    $this->plots[$i]->ymin=$this->ybase;
	    $this->plots[$i]->SetWidth($this->width/$this->nbrplots);
	    $xscale->off = $tmp+$i*round($xscale->ticks->major_step*$xscale->scale_factor*$this->width/$this->nbrplots);
	    $this->plots[$i]->Stroke($img,$xscale,$yscale);
	}
	$xscale->off=$tmp;
    }
} // Class

//===================================================
// CLASS AccBarPlot
// Description: Produce accumulated bar plots
//===================================================
class AccBarPlot extends BarPlot {
    var $plots=null,$nbrplots=0,$numpoints=0;
//---------------
// CONSTRUCTOR
    function AccBarPlot($plots) {
	$this->plots = $plots;
	$this->nbrplots = count($plots);
	$this->numpoints = $plots[0]->numpoints;		
    }

//---------------
// PUBLIC METHODS	
    function Legend(&$graph) {
	$n = count($this->plots);
	for( $i=0; $i<$n; ++$i ) 
	    $this->plots[$i]->Legend($graph);
    }

    function Max() {
	list($xmax) = $this->plots[0]->Max();
	$nmax=0;
	for($i=0; $i<count($this->plots); ++$i) {
	    $n = count($this->plots[$i]->coords[0]);
	    $nmax = max($nmax,$n);
	    list($x) = $this->plots[$i]->Max();
	    $xmax = Max($xmax,$x);
	}
	for( $i = 0; $i < $nmax; $i++ ) {
	    // Get y-value for bar $i by adding the
	    // individual bars from all the plots added.
	    // It would be wrong to just add the
	    // individual plots max y-value since that
	    // would in most cases give to large y-value.
	    $y=$this->plots[0]->coords[0][$i];
	    for( $j = 1; $j < $this->nbrplots; $j++ ) {
		$y += $this->plots[ $j ]->coords[0][$i];
	    }
	    $ymax[$i] = $y;
	}
	$ymax = max($ymax);

	// Bar always start at baseline
	if( $ymax <= $this->ybase ) 
	    $ymax = $this->ybase;
	return array($xmax,$ymax);
    }

    function Min() {
	$nmax=0;
	list($xmin,$ysetmin) = $this->plots[0]->Min();
	for($i=0; $i<count($this->plots); ++$i) {
	    $n = count($this->plots[$i]->coords[0]);
	    $nmax = max($nmax,$n);
	    list($x,$y) = $this->plots[$i]->Min();
	    $xmin = Min($xmin,$x);
	    $ysetmin = Min($y,$ysetmin);
	}
	for( $i = 0; $i < $nmax; $i++ ) {
	    // Get y-value for bar $i by adding the
	    // individual bars from all the plots added.
	    // It would be wrong to just add the
	    // individual plots max y-value since that
	    // would in most cases give to large y-value.
	    $y=$this->plots[0]->coords[0][$i];
	    for( $j = 1; $j < $this->nbrplots; $j++ ) {
		$y += $this->plots[ $j ]->coords[0][$i];
	    }
	    $ymin[$i] = $y;
	}
	$ymin = Min($ysetmin,Min($ymin));
	// Bar always start at baseline
	if( $ymin >= $this->ybase )
	    $ymin = $this->ybase;
	return array($xmin,$ymin);
    }

    // Method description
    function Stroke(&$img,&$xscale,&$yscale) {
	$img->SetLineWeight($this->weight);
	for($i=0; $i<$this->numpoints-1; $i++) {
	    $accy = 0;
	    $accy_neg = 0; 
	    for($j=0; $j<$this->nbrplots; ++$j ) {				
		$img->SetColor($this->plots[$j]->color);
		if ($this->plots[$j]->coords[0][$i] > 0) {
		    $yt=$yscale->Translate($this->plots[$j]->coords[0][$i]+$accy);
		    $accyt=$yscale->Translate($accy);
		    $accy+=$this->plots[$j]->coords[0][$i];
		} else {
		    $yt=$yscale->Translate($this->plots[$j]->coords[0][$i]+$accy_neg);
		    $accyt=$yscale->Translate($accy_neg);
		    $accy_neg+=$this->plots[$j]->coords[0][$i];
		}				
				
		$xt=$xscale->Translate($i);
		$abswidth=round($this->width*$xscale->scale_factor,0);
		$pts=array($xt,$accyt,$xt,$yt,$xt+$abswidth,$yt,$xt+$abswidth,$accyt);
				
		if( $this->plots[$j]->grad ) {
		    $grad = new Gradient($img);
		    $grad->FilledRectangle(
			$pts[2],$pts[3],
			$pts[6],$pts[7],
			$this->plots[$j]->grad_fromcolor,
			$this->plots[$j]->grad_tocolor,
			$this->plots[$j]->grad_style);				
		} elseif ($this->plots[$j]->fill_color ) {
		    $img->SetColor($this->plots[$j]->fill_color);
		    $img->FilledPolygon($pts,4);
		    $img->SetColor($this->plots[$j]->color);
		}				  

		if( $this->bar_shadow ) {
		    $ssh = $this->bar_shadow_hsize;
		    $ssv = $this->bar_shadow_vsize;
		    // Create points to create a "upper-right" shadow
		    $sp[0]=$pts[6];		$sp[1]=$pts[7];
		    $sp[2]=$pts[4];		$sp[3]=$pts[5];
		    $sp[4]=$pts[2];	$sp[5]=$pts[3];
		    $sp[6]=$pts[2]+$ssh;	$sp[7]=$pts[3]-$ssv;
		    $sp[8]=$pts[4]+$ssh;	$sp[9]=$pts[5]-$ssv;
		    $sp[10]=$pts[6]+$ssh;	$sp[11]=$pts[7]-$ssv;
		    $img->SetColor($this->bar_shadow_color);
		    $img->FilledPolygon($sp,4);
		}

		if( $i < count($this->plots[$j]->csimtargets) ) {
		    $this->csimareas.= "<area shape=\"rect\" coords=\"";
		    // Hmmm, this is fishy.  Fixes a bug in Opera whereby if Y2<Y1 or X2<X1 the csim doesn't work
		    // This means that the area MUST specify top left and bottom right corners
		    if ($pts[3] < $pts[7]) {
			if ($pts[2] < $pts[6]) {
			    $this->csimareas.= "$pts[2], $pts[3], $pts[6], $pts[7]\"";
			} else {
			    $this->csimareas.= "$pts[6], $pts[3], $pts[2], $pts[7]\"";
			}
		    } else {
			if ($pts[2] < $pts[6]) {
			    $this->csimareas.= "$pts[2], $pts[7], $pts[6], $pts[3]\"";
			} else {
			    $this->csimareas.= "$pts[6], $pts[7], $pts[2], $pts[3]\"";
			}
		    }
		    $this->csimareas.= " href=\"".$this->plots[$j]->csimtargets[$i]."\"";
		    if( !empty($this->plots[$j]->csimalts[$i]) ) {
			$sval=sprintf($this->plots[$j]->csimalts[$i],$this->plots[$j]->coords[0][$i]);										
			$this->csimareas .= " alt=\"$sval\" title=\"$sval\" ";
		    }
		    $this->csimareas .= ">\r\n";				
		}
				
		$img->Polygon($pts,4);
	    }
			
	    $yt=$yscale->Translate($accy);
			
	    if( $this->show_value) {
		$sval=sprintf($this->show_value_format,$accy);
		$txt = new Text($sval);
		$txt->SetFont($this->show_value_ff,$this->show_value_fs,$this->show_value_fsize);
		$txt->SetColor($this->show_value_color);
		$x=$pts[2]+($pts[4]-$pts[2])/2;
		if($this->bar_shadow)
		    $x += $ssh;
		$txt->Pos($x,$yt-$this->show_value_margin);
		$txt->Align("center","bottom");
		$txt->SetOrientation($this->show_value_angle);
		$txt->Stroke($img);			
	    }			
	}
	return true;
    }
} // Class

/* EOF */
?>