<?php
/*=======================================================================
 // File:        JPGRAPH_BAR.PHP
 // Description: Bar plot extension for JpGraph
 // Created:     2001-01-08
 // Ver:         $Id: jpgraph_bar.php 1763 2009-08-01 08:34:17Z ljp $
 //
 // Copyright (c) Aditus Consulting. All rights reserved.
 //========================================================================
 */

require_once('jpgraph_plotband.php');

// Pattern for Bars
DEFINE('PATTERN_DIAG1',1);
DEFINE('PATTERN_DIAG2',2);
DEFINE('PATTERN_DIAG3',3);
DEFINE('PATTERN_DIAG4',4);
DEFINE('PATTERN_CROSS1',5);
DEFINE('PATTERN_CROSS2',6);
DEFINE('PATTERN_CROSS3',7);
DEFINE('PATTERN_CROSS4',8);
DEFINE('PATTERN_STRIPE1',9);
DEFINE('PATTERN_STRIPE2',10);

//===================================================
// CLASS BarPlot
// Description: Main code to produce a bar plot
//===================================================
class BarPlot extends Plot {
    public $fill=false,$fill_color="lightblue"; // Default is to fill with light blue
    public $iPattern=-1,$iPatternDensity=80,$iPatternColor='black';
    public $valuepos='top';
    public $grad=false,$grad_style=1;
    public $grad_fromcolor=array(50,50,200),$grad_tocolor=array(255,255,255);
    public $ymin=0;
    protected $width=0.4; // in percent of major ticks
    protected $abswidth=-1; // Width in absolute pixels
    protected $ybase=0; // Bars start at 0
    protected $align="center";
    protected $bar_shadow=false;
    protected $bar_shadow_color="black";
    protected $bar_shadow_hsize=3,$bar_shadow_vsize=3;

    //---------------
    // CONSTRUCTOR
    function __construct($datay,$datax=false) {
        parent::__construct($datay,$datax);
        ++$this->numpoints;
    }

    //---------------
    // PUBLIC METHODS

    // Set a drop shadow for the bar (or rather an "up-right" shadow)
    function SetShadow($aColor="black",$aHSize=3,$aVSize=3,$aShow=true) {
        $this->bar_shadow=$aShow;
        $this->bar_shadow_color=$aColor;
        $this->bar_shadow_vsize=$aVSize;
        $this->bar_shadow_hsize=$aHSize;

        // Adjust the value margin to compensate for shadow
        $this->value->margin += $aVSize;
    }

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

    // Specify the base value for the bars
    function SetYBase($aYStartValue) {
        $this->ybase=$aYStartValue;
    }

    // The method will take the specified pattern anre
    // return a pattern index that corresponds to the original
    // patterm being rotated 90 degreees. This is needed when plottin
    // Horizontal bars
    function RotatePattern($aPat,$aRotate=true) {
        $rotate = array(1 => 2, 2 => 1, 3 => 3, 4 => 5, 5 => 4, 6 => 6, 7 => 7, 8 => 8);
        if( $aRotate ) {
            return $rotate[$aPat];
        }
        else {
            return $aPat;
        }
    }

    function Legend($graph) {
        if( $this->grad && $this->legend!="" && !$this->fill ) {
            $color=array($this->grad_fromcolor,$this->grad_tocolor);
            // In order to differentiate between gradients and cooors specified as an RGB triple
            $graph->legend->Add($this->legend,$color,"",-$this->grad_style,
            $this->legendcsimtarget,$this->legendcsimalt,$this->legendcsimwintarget);
        }
        elseif( $this->legend!="" && ($this->iPattern > -1 || is_array($this->iPattern)) ) {
            if( is_array($this->iPattern) ) {
                $p1 = $this->RotatePattern( $this->iPattern[0], $graph->img->a == 90 );
                $p2 = $this->iPatternColor[0];
                $p3 = $this->iPatternDensity[0];
            }
            else {
                $p1 = $this->RotatePattern( $this->iPattern, $graph->img->a == 90 );
                $p2 = $this->iPatternColor;
                $p3 = $this->iPatternDensity;
            }
            if( $p3 < 90 ) $p3 += 5;
            $color = array($p1,$p2,$p3,$this->fill_color);
            // A kludge: Too mark that we add a pattern we use a type value of < 100
            $graph->legend->Add($this->legend,$color,"",-101,
                                $this->legendcsimtarget,$this->legendcsimalt,$this->legendcsimwintarget);
        }
        elseif( $this->fill_color && $this->legend!="" ) {
            if( is_array($this->fill_color) ) {
                $graph->legend->Add($this->legend,$this->fill_color[0],"",0,
                $this->legendcsimtarget,$this->legendcsimalt,$this->legendcsimwintarget);
            }
            else {
                $graph->legend->Add($this->legend,$this->fill_color,"",0,
                $this->legendcsimtarget,$this->legendcsimalt,$this->legendcsimwintarget);
            }
        }
    }

    // Gets called before any axis are stroked
    function PreStrokeAdjust($graph) {
        parent::PreStrokeAdjust($graph);

        // If we are using a log Y-scale we want the base to be at the
        // minimum Y-value unless the user have specifically set some other
        // value than the default.
        if( substr($graph->axtype,-3,3)=="log" && $this->ybase==0 )
        $this->ybase = $graph->yaxis->scale->GetMinVal();

        // 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);

            // Center the bars
            if( $this->abswidth > -1 ) {
                $graph->SetTextScaleAbsCenterOff($this->abswidth);
            }
            else {
                if( $this->align == "center" )
                $graph->SetTextScaleOff(0.5-$this->width/2);
                elseif( $this->align == "right" )
                $graph->SetTextScaleOff(1-$this->width);
            }
        }
        elseif( ($this instanceof AccBarPlot) || ($this instanceof GroupBarPlot) ) {
            // 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 = $graph->img->plotwidth/(2*$this->numpoints);
            }
        }
    }

    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($aWidth) {
        if( $aWidth > 1 ) {
            // Interpret this as absolute width
            $this->abswidth=$aWidth;
        }
        else {
            $this->width=$aWidth;
        }
    }

    // Specify width in absolute pixels. If specified this
    // overrides SetWidth()
    function SetAbsWidth($aWidth) {
        $this->abswidth=$aWidth;
    }

    function SetAlign($aAlign) {
        $this->align=$aAlign;
    }

    function SetNoFill() {
        $this->grad = false;
        $this->fill_color=false;
        $this->fill=false;
    }

    function SetFillColor($aColor) {
        // Do an extra error check if the color is specified as an RG array triple
        // In that case convert it to a hex string since it will otherwise be
        // interpretated as an array of colors for each individual bar.

        $aColor = RGB::tryHexConversion($aColor);
        $this->fill = true ;
        $this->fill_color=$aColor;

    }

    function SetFillGradient($aFromColor,$aToColor=null,$aStyle=null) {
        $this->grad = true;
        $this->grad_fromcolor = $aFromColor;
        $this->grad_tocolor   = $aToColor;
        $this->grad_style     = $aStyle;
    }

    function SetValuePos($aPos) {
        $this->valuepos = $aPos;
    }

    function SetPattern($aPattern, $aColor='black'){
        if( is_array($aPattern) ) {
            $n = count($aPattern);
            $this->iPattern = array();
            $this->iPatternDensity = array();
            if( is_array($aColor) ) {
                $this->iPatternColor = array();
                if( count($aColor) != $n ) {
                    JpGraphError::RaiseL(2001);//('NUmber of colors is not the same as the number of patterns in BarPlot::SetPattern()');
                }
            }
            else {
                $this->iPatternColor = $aColor;
            }
            for( $i=0; $i < $n; ++$i ) {
                $this->_SetPatternHelper($aPattern[$i], $this->iPattern[$i], $this->iPatternDensity[$i]);
                if( is_array($aColor) ) {
                    $this->iPatternColor[$i] = $aColor[$i];
                }
            }
        }
        else {
            $this->_SetPatternHelper($aPattern, $this->iPattern, $this->iPatternDensity);
            $this->iPatternColor = $aColor;
        }
    }

    function _SetPatternHelper($aPattern, &$aPatternValue, &$aDensity){
        switch( $aPattern ) {
            case PATTERN_DIAG1:
                $aPatternValue= 1;
                $aDensity = 92;
                break;
            case PATTERN_DIAG2:
                $aPatternValue= 1;
                $aDensity = 78;
                break;
            case PATTERN_DIAG3:
                $aPatternValue= 2;
                $aDensity = 92;
                break;
            case PATTERN_DIAG4:
                $aPatternValue= 2;
                $aDensity = 78;
                break;
            case PATTERN_CROSS1:
                $aPatternValue= 8;
                $aDensity = 90;
                break;
            case PATTERN_CROSS2:
                $aPatternValue= 8;
                $aDensity = 78;
                break;
            case PATTERN_CROSS3:
                $aPatternValue= 8;
                $aDensity = 65;
                break;
            case PATTERN_CROSS4:
                $aPatternValue= 7;
                $aDensity = 90;
                break;
            case PATTERN_STRIPE1:
                $aPatternValue= 5;
                $aDensity = 94;
                break;
            case PATTERN_STRIPE2:
                $aPatternValue= 5;
                $aDensity = 85;
                break;
            default:
                JpGraphError::RaiseL(2002);
                //('Unknown pattern specified in call to BarPlot::SetPattern()');
        }
    }

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

        $numpoints = count($this->coords[0]);
        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;
        }


        $numbars=count($this->coords[0]);

        // Use GetMinVal() instead of scale[0] directly since in the case
        // of log scale we get a correct value. Log scales will have negative
        // values for values < 1 while still not representing negative numbers.
        if( $yscale->GetMinVal() >= 0 )
        $zp=$yscale->scale_abs[0];
        else {
            $zp=$yscale->Translate(0);
        }

        if( $this->abswidth > -1 ) {
            $abswidth=$this->abswidth;
        }
        else {
            $abswidth=round($this->width*$xscale->scale_factor,0);
        }

        // Count pontetial pattern array to avoid doing the count for each iteration
        if( is_array($this->iPattern) ) {
            $np = count($this->iPattern);
        }

        $grad = null;
        for($i=0; $i < $numbars; ++$i) {

            // If value is NULL, or 0 then don't draw a bar at all
            if ($this->coords[0][$i] === null || $this->coords[0][$i] === '' )
            continue;

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

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

            // Comment Note: This confuses the positioning when using acc together with
            // grouped bars. Workaround for fixing #191
            /*
            if( !$xscale->textscale ) {
            if($this->align=="center")
            $x -= $abswidth/2;
            elseif($this->align=="right")
            $x -= $abswidth;
            }
            */
            // Stroke fill color and fill gradient
            $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 ) {
                if( $grad === null ) {
                    $grad = new Gradient($img);
                }
                if( is_array($this->grad_fromcolor) ) {
                    // The first argument (grad_fromcolor) can be either an array or a single color. If it is an array
                    // then we have two choices. It can either a) be a single color specified as an RGB triple or it can be
                    // an array to specify both (from, to style) for each individual bar. The way to know the difference is
                    // to investgate the first element. If this element is an integer [0,255] then we assume it is an RGB
                    // triple.
                    $ng = count($this->grad_fromcolor);
                    if( $ng === 3 ) {
                        if( is_numeric($this->grad_fromcolor[0]) && $this->grad_fromcolor[0] > 0 && $this->grad_fromcolor[0] < 256 ) {
                            // RGB Triple
                            $fromcolor = $this->grad_fromcolor;
                            $tocolor = $this->grad_tocolor;
                            $style = $this->grad_style;
                        }
                    }
                    else {
                        $fromcolor = $this->grad_fromcolor[$i % $ng][0];
                        $tocolor = $this->grad_fromcolor[$i % $ng][1];
                        $style = $this->grad_fromcolor[$i % $ng][2];
                    }
                    $grad->FilledRectangle($pts[2],$pts[3],
                    $pts[6],$pts[7],
                    $fromcolor,$tocolor,$style);
                }
                else {
                    $grad->FilledRectangle($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( !empty($val) && !is_numeric($val) ) {
                JpGraphError::RaiseL(2004,$i,$val);
                //'All values for a barplot must be numeric. You have specified value['.$i.'] == \''.$val.'\'');
            }

            // Determine the shadow
            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]-$ssv;
                }
                if( is_array($this->bar_shadow_color) ) {
                    $numcolors = count($this->bar_shadow_color);
                    if( $numcolors == 0 ) {
                        JpGraphError::RaiseL(2005);//('You have specified an empty array for shadow colors in the bar plot.');
                    }
                    $img->PushColor($this->bar_shadow_color[$i % $numcolors]);
                }
                else {
                    $img->PushColor($this->bar_shadow_color);
                }
                $img->FilledPolygon($sp);
                $img->PopColor();
            }

            // Stroke the pattern
            if( is_array($this->iPattern) ) {
                $f = new RectPatternFactory();
                if( is_array($this->iPatternColor) ) {
                    $pcolor = $this->iPatternColor[$i % $np];
                }
                else {
                    $pcolor = $this->iPatternColor;
                }
                $prect = $f->Create($this->iPattern[$i % $np],$pcolor,1);
                $prect->SetDensity($this->iPatternDensity[$i % $np]);

                if( $val < 0 ) {
                    $rx = $pts[0];
                    $ry = $pts[1];
                }
                else {
                    $rx = $pts[2];
                    $ry = $pts[3];
                }
                $width = abs($pts[4]-$pts[0])+1;
                $height = abs($pts[1]-$pts[3])+1;
                $prect->SetPos(new Rectangle($rx,$ry,$width,$height));
                $prect->Stroke($img);
            }
            else {
                if( $this->iPattern > -1 ) {
                    $f = new RectPatternFactory();
                    $prect = $f->Create($this->iPattern,$this->iPatternColor,1);
                    $prect->SetDensity($this->iPatternDensity);
                    if( $val < 0 ) {
                        $rx = $pts[0];
                        $ry = $pts[1];
                    }
                    else {
                        $rx = $pts[2];
                        $ry = $pts[3];
                    }
                    $width = abs($pts[4]-$pts[0])+1;
                    $height = abs($pts[1]-$pts[3])+1;
                    $prect->SetPos(new Rectangle($rx,$ry,$width,$height));
                    $prect->Stroke($img);
                }
            }

            // Stroke the outline of the bar
            if( is_array($this->color) ) {
                $img->SetColor($this->color[$i % count($this->color)]);
            }
            else {
                $img->SetColor($this->color);
            }

            $pts[] = $pts[0];
            $pts[] = $pts[1];

            if( $this->weight > 0 ) {
                $img->SetLineWeight($this->weight);
                $img->Polygon($pts);
            }

            // Determine how to best position the values of the individual bars
            $x=$pts[2]+($pts[4]-$pts[2])/2;
            $this->value->SetMargin(5);

            if( $this->valuepos=='top' ) {
                $y=$pts[3];
                if( $img->a === 90 ) {
                    if( $val < 0 ) {
                        $this->value->SetAlign('right','center');
                    }
                    else {
                        $this->value->SetAlign('left','center');
                    }

                }
                else {
                    if( $val < 0 ) {
                        $this->value->SetMargin(-5);
                        $y=$pts[1];
                        $this->value->SetAlign('center','bottom');
                    }
                    else {
                        $this->value->SetAlign('center','bottom');
                    }

                }
                $this->value->Stroke($img,$val,$x,$y);
            }
            elseif( $this->valuepos=='max' ) {
                $y=$pts[3];
                if( $img->a === 90 ) {
                    if( $val < 0 )
                    $this->value->SetAlign('left','center');
                    else
                    $this->value->SetAlign('right','center');
                }
                else {
                    if( $val < 0 ) {
                        $this->value->SetAlign('center','bottom');
                    }
                    else {
                        $this->value->SetAlign('center','top');
                    }
                }
                $this->value->SetMargin(-5);
                $this->value->Stroke($img,$val,$x,$y);
            }
            elseif( $this->valuepos=='center' ) {
                $y = ($pts[3] + $pts[1])/2;
                $this->value->SetAlign('center','center');
                $this->value->SetMargin(0);
                $this->value->Stroke($img,$val,$x,$y);
            }
            elseif( $this->valuepos=='bottom' || $this->valuepos=='min' ) {
                $y=$pts[1];
                if( $img->a === 90 ) {
                    if( $val < 0 )
                    $this->value->SetAlign('right','center');
                    else
                    $this->value->SetAlign('left','center');
                }
                $this->value->SetMargin(3);
                $this->value->Stroke($img,$val,$x,$y);
            }
            else {
                JpGraphError::RaiseL(2006,$this->valuepos);
                //'Unknown position for values on bars :'.$this->valuepos);
            }
            // Create the client side image map
            $rpts = $img->ArrRotate($pts);
            $csimcoord=round($rpts[0]).", ".round($rpts[1]);
            for( $j=1; $j < 4; ++$j){
                $csimcoord .= ", ".round($rpts[2*$j]).", ".round($rpts[2*$j+1]);
            }
            if( !empty($this->csimtargets[$i]) ) {
                $this->csimareas .= '<area shape="poly" coords="'.$csimcoord.'" ';
                $this->csimareas .= " href=\"".htmlentities($this->csimtargets[$i])."\"";

                if( !empty($this->csimwintargets[$i]) ) {
                    $this->csimareas .= " target=\"".$this->csimwintargets[$i]."\" ";
                }

                $sval='';
                if( !empty($this->csimalts[$i]) ) {
                    $sval=sprintf($this->csimalts[$i],$this->coords[0][$i]);
                    $this->csimareas .= " title=\"$sval\" alt=\"$sval\" ";
                }
                $this->csimareas .= " />\n";
            }
        }
        return true;
    }
} // Class

//===================================================
// CLASS GroupBarPlot
// Description: Produce grouped bar plots
//===================================================
class GroupBarPlot extends BarPlot {
    private $plots, $nbrplots=0;
    //---------------
    // CONSTRUCTOR
    function GroupBarPlot($plots) {
        $this->width=0.7;
        $this->plots = $plots;
        $this->nbrplots = count($plots);
        if( $this->nbrplots < 1 ) {
            JpGraphError::RaiseL(2007);//('Cannot create GroupBarPlot from empty plot array.');
        }
        for($i=0; $i < $this->nbrplots; ++$i ) {
            if( empty($this->plots[$i]) || !isset($this->plots[$i]) ) {
                JpGraphError::RaiseL(2008,$i);//("Group bar plot element nbr $i is undefined or empty.");
            }
        }
        $this->numpoints = $plots[0]->numpoints;
        $this->width=0.7;
    }

    //---------------
    // PUBLIC METHODS
    function Legend($graph) {
        $n = count($this->plots);
        for($i=0; $i < $n; ++$i) {
            $c = get_class($this->plots[$i]);
            if( !($this->plots[$i] instanceof BarPlot) ) {
                JpGraphError::RaiseL(2009,$c);
                //('One of the objects submitted to GroupBar is not a BarPlot. Make sure that you create the Group Bar plot from an array of BarPlot or AccBarPlot objects. (Class = '.$c.')');
            }
            $this->plots[$i]->DoLegend($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);
        $csimareas='';
        for($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);
        $subwidth = $this->width/$this->nbrplots ;

        for( $i=0; $i < $n; ++$i ) {
            $this->plots[$i]->ymin=$this->ybase;
            $this->plots[$i]->SetWidth($subwidth);

            // If the client have used SetTextTickInterval() then
            // major_step will be > 1 and the positioning will fail.
            // If we assume it is always one the positioning will work
            // fine with a text scale but this will not work with
            // arbitrary linear scale
            $xscale->off = $tmp+$i*round($xscale->scale_factor* $subwidth);
            $this->plots[$i]->Stroke($img,$xscale,$yscale);
        }
        $xscale->off=$tmp;
    }
} // Class

//===================================================
// CLASS AccBarPlot
// Description: Produce accumulated bar plots
//===================================================
class AccBarPlot extends BarPlot {
    private $plots=null,$nbrplots=0;
    //---------------
    // CONSTRUCTOR
    function __construct($plots) {
        $this->plots = $plots;
        $this->nbrplots = count($plots);
        if( $this->nbrplots < 1 ) {
            JpGraphError::RaiseL(2010);//('Cannot create AccBarPlot from empty plot array.');
        }
        for($i=0; $i < $this->nbrplots; ++$i ) {
            if( empty($this->plots[$i]) || !isset($this->plots[$i]) ) {
                JpGraphError::RaiseL(2011,$i);//("Acc bar plot element nbr $i is undefined or empty.");
            }
        }

        // We can only allow individual plost which do not have specified X-positions
        for($i=0; $i < $this->nbrplots; ++$i ) {
            if( !empty($this->plots[$i]->coords[1]) ) {
                JpGraphError::RaiseL(2015);
                //'Individual bar plots in an AccBarPlot or GroupBarPlot can not have specified X-positions.');
            }
        }

        // Use 0 weight by default which means that the individual bar
        // weights will be used per part n the accumulated bar
        $this->SetWeight(0);

        $this->numpoints = $plots[0]->numpoints;
        $this->value = new DisplayValue();
    }

    //---------------
    // PUBLIC METHODS
    function Legend($graph) {
        $n = count($this->plots);
        for( $i=$n-1; $i >= 0; --$i ) {
            $c = get_class($this->plots[$i]);
            if( !($this->plots[$i] instanceof BarPlot) ) {
                JpGraphError::RaiseL(2012,$c);
                //('One of the objects submitted to AccBar is not a BarPlot. Make sure that you create the AccBar plot from an array of BarPlot objects.(Class='.$c.')');
            }
            $this->plots[$i]->DoLegend($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.
            $y=0;
            if( !isset($this->plots[0]->coords[0][$i]) ) {
                JpGraphError::RaiseL(2014);
            }
            if( $this->plots[0]->coords[0][$i] > 0 )
            $y=$this->plots[0]->coords[0][$i];
            for( $j = 1; $j < $this->nbrplots; $j++ ) {
                if( !isset($this->plots[$j]->coords[0][$i]) ) {
                    JpGraphError::RaiseL(2014);
                }
                if( $this->plots[$j]->coords[0][$i] > 0 )
                $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=0;
            if( $this->plots[0]->coords[0][$i] < 0 )
            $y=$this->plots[0]->coords[0][$i];
            for( $j = 1; $j < $this->nbrplots; $j++ ) {
                if( $this->plots[$j]->coords[0][$i] < 0 )
                $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);
    }

    // Stroke acc bar plot
    function Stroke($img,$xscale,$yscale) {
        $pattern=NULL;
        $img->SetLineWeight($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 {
                    //if ( $this->plots[$j]->coords[0][$i] < 0 || $accy_neg < 0 ) {
                    $yt=$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);

                if( $this->abswidth > -1 ) {
                    $abswidth=$this->abswidth;
                }
                else {
                    $abswidth=round($this->width*$xscale->scale_factor,0);
                }

                $pts=array($xt,$accyt,$xt,$yt,$xt+$abswidth,$yt,$xt+$abswidth,$accyt);

                if( $this->bar_shadow ) {
                    $ssh = $this->bar_shadow_hsize;
                    $ssv = $this->bar_shadow_vsize;

                    // We must also differ if we are a positive or negative bar.
                    if( $j === 0 ) {
                        // This gets extra complicated since we have to
                        // see all plots to see if we are negative. It could
                        // for example be that all plots are 0 until the very
                        // last one. We therefore need to save the initial setup
                        // for both the negative and positive case

                        // In case the final bar is positive
                        $sp[0]=$pts[6]+1; $sp[1]=$pts[7];
                        $sp[2]=$pts[6]+$ssh; $sp[3]=$pts[7]-$ssv;

                        // In case the final bar is negative
                        $nsp[0]=$pts[0]; $nsp[1]=$pts[1];
                        $nsp[2]=$pts[0]+$ssh; $nsp[3]=$pts[1]-$ssv;
                        $nsp[4]=$pts[6]+$ssh; $nsp[5]=$pts[7]-$ssv;
                        $nsp[10]=$pts[6]+1; $nsp[11]=$pts[7];
                    }

                    if( $j === $this->nbrplots-1 ) {
                        // If this is the last plot of the bar and
                        // the total value is larger than 0 then we
                        // add the shadow.
                        if( is_array($this->bar_shadow_color) ) {
                            $numcolors = count($this->bar_shadow_color);
                            if( $numcolors == 0 ) {
                                JpGraphError::RaiseL(2013);//('You have specified an empty array for shadow colors in the bar plot.');
                            }
                            $img->PushColor($this->bar_shadow_color[$i % $numcolors]);
                        }
                        else {
                            $img->PushColor($this->bar_shadow_color);
                        }

                        if( $accy > 0 ) {
                            $sp[4]=$pts[4]+$ssh; $sp[5]=$pts[5]-$ssv;
                            $sp[6]=$pts[2]+$ssh; $sp[7]=$pts[3]-$ssv;
                            $sp[8]=$pts[2]; $sp[9]=$pts[3]-1;
                            $sp[10]=$pts[4]+1; $sp[11]=$pts[5];
                            $img->FilledPolygon($sp,4);
                        }
                        elseif( $accy_neg < 0 ) {
                            $nsp[6]=$pts[4]+$ssh; $nsp[7]=$pts[5]-$ssv;
                            $nsp[8]=$pts[4]+1; $nsp[9]=$pts[5];
                            $img->FilledPolygon($nsp,4);
                        }
                        $img->PopColor();
                    }
                }


                // If value is NULL or 0, then don't draw a bar at all
                if ($this->plots[$j]->coords[0][$i] == 0 ) continue;

                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);
                } else {
                    if (is_array($this->plots[$j]->fill_color) ) {
                        $numcolors = count($this->plots[$j]->fill_color);
                        $fillcolor = $this->plots[$j]->fill_color[$i % $numcolors];
                        // If the bar is specified to be non filled then the fill color is false
                        if( $fillcolor !== false ) {
                            $img->SetColor($this->plots[$j]->fill_color[$i % $numcolors]);
                        }
                    }
                    else {
                        $fillcolor = $this->plots[$j]->fill_color;
                        if( $fillcolor !== false ) {
                            $img->SetColor($this->plots[$j]->fill_color);
                        }
                    }
                    if( $fillcolor !== false ) {
                        $img->FilledPolygon($pts);
                    }
                }

                $img->SetColor($this->plots[$j]->color);

                // Stroke the pattern
                if( $this->plots[$j]->iPattern > -1 ) {
                    if( $pattern===NULL ) {
                        $pattern = new RectPatternFactory();
                    }

                    $prect = $pattern->Create($this->plots[$j]->iPattern,$this->plots[$j]->iPatternColor,1);
                    $prect->SetDensity($this->plots[$j]->iPatternDensity);
                    if( $this->plots[$j]->coords[0][$i] < 0 ) {
                        $rx = $pts[0];
                        $ry = $pts[1];
                    }
                    else {
                        $rx = $pts[2];
                        $ry = $pts[3];
                    }
                    $width = abs($pts[4]-$pts[0])+1;
                    $height = abs($pts[1]-$pts[3])+1;
                    $prect->SetPos(new Rectangle($rx,$ry,$width,$height));
                    $prect->Stroke($img);
                }


                // CSIM array

                if( $i < count($this->plots[$j]->csimtargets) ) {
                    // Create the client side image map
                    $rpts = $img->ArrRotate($pts);
                    $csimcoord=round($rpts[0]).", ".round($rpts[1]);
                    for( $k=1; $k < 4; ++$k){
                        $csimcoord .= ", ".round($rpts[2*$k]).", ".round($rpts[2*$k+1]);
                    }
                    if( ! empty($this->plots[$j]->csimtargets[$i]) ) {
                        $this->csimareas.= '<area shape="poly" coords="'.$csimcoord.'" ';
                        $this->csimareas.= " href=\"".$this->plots[$j]->csimtargets[$i]."\" ";

                        if( ! empty($this->plots[$j]->csimwintargets[$i]) ) {
                            $this->csimareas.= " target=\"".$this->plots[$j]->csimwintargets[$i]."\" ";
                        }

                        $sval='';
                        if( !empty($this->plots[$j]->csimalts[$i]) ) {
                            $sval=sprintf($this->plots[$j]->csimalts[$i],$this->plots[$j]->coords[0][$i]);
                            $this->csimareas .= " title=\"$sval\" ";
                        }
                        $this->csimareas .= " alt=\"$sval\" />\n";
                    }
                }

                $pts[] = $pts[0];
                $pts[] = $pts[1];
                $img->SetLineWeight($this->plots[$j]->weight);
                $img->Polygon($pts);
                $img->SetLineWeight(1);
            }

            // Daw potential bar around the entire accbar bar
            if( $this->weight > 0 ) {
                $y=$yscale->Translate(0);
                $img->SetColor($this->color);
                $img->SetLineWeight($this->weight);
                $img->Rectangle($pts[0],$y,$pts[6],$pts[5]);
            }

            // Draw labels for each acc.bar

            $x=$pts[2]+($pts[4]-$pts[2])/2;
            if($this->bar_shadow) $x += $ssh;

            // First stroke the accumulated value for the entire bar
            // This value is always placed at the top/bottom of the bars
            if( $accy_neg < 0 ) {
                $y=$yscale->Translate($accy_neg);
                $this->value->Stroke($img,$accy_neg,$x,$y);
            }
            else {
                $y=$yscale->Translate($accy);
                $this->value->Stroke($img,$accy,$x,$y);
            }

            $accy = 0;
            $accy_neg = 0;
            for($j=0; $j < $this->nbrplots; ++$j ) {

                // We don't print 0 values in an accumulated bar plot
                if( $this->plots[$j]->coords[0][$i] == 0 ) continue;

                if ($this->plots[$j]->coords[0][$i] > 0) {
                    $yt=$yscale->Translate($this->plots[$j]->coords[0][$i]+$accy);
                    $accyt=$yscale->Translate($accy);
                    if(  $this->plots[$j]->valuepos=='center' ) {
                        $y = $accyt-($accyt-$yt)/2;
                    }
                    elseif( $this->plots[$j]->valuepos=='bottom' ) {
                        $y = $accyt;
                    }
                    else { // top or max
                        $y = $accyt-($accyt-$yt);
                    }
                    $accy+=$this->plots[$j]->coords[0][$i];
                    if(  $this->plots[$j]->valuepos=='center' ) {
                        $this->plots[$j]->value->SetAlign("center","center");
                        $this->plots[$j]->value->SetMargin(0);
                    }
                    elseif( $this->plots[$j]->valuepos=='bottom' ) {
                        $this->plots[$j]->value->SetAlign('center','bottom');
                        $this->plots[$j]->value->SetMargin(2);
                    }
                    else {
                        $this->plots[$j]->value->SetAlign('center','top');
                        $this->plots[$j]->value->SetMargin(1);
                    }
                } 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];
                    if(  $this->plots[$j]->valuepos=='center' ) {
                        $y = $accyt-($accyt-$yt)/2;
                    }
                    elseif( $this->plots[$j]->valuepos=='bottom' ) {
                        $y = $accyt;
                    }
                    else {
                        $y = $accyt-($accyt-$yt);
                    }
                    if(  $this->plots[$j]->valuepos=='center' ) {
                        $this->plots[$j]->value->SetAlign("center","center");
                        $this->plots[$j]->value->SetMargin(0);
                    }
                    elseif( $this->plots[$j]->valuepos=='bottom' ) {
                        $this->plots[$j]->value->SetAlign('center',$j==0 ? 'bottom':'top');
                        $this->plots[$j]->value->SetMargin(-2);
                    }
                    else {
                        $this->plots[$j]->value->SetAlign('center','bottom');
                        $this->plots[$j]->value->SetMargin(-1);
                    }
                }
                $this->plots[$j]->value->Stroke($img,$this->plots[$j]->coords[0][$i],$x,$y);
            }

        }
        return true;
    }
} // Class

/* EOF */
?>
