<?php
/*=======================================================================
// File:        JPGRAPH_POLAR.PHP
// Description: Polar plot extension for JpGraph
// Created:     2003-02-02
// Author:      Johan Persson (johanp@aditus.nu)
// Ver:         $Id: jpgraph_polar.php,v 2.14 2005/01/30 21:05:39 aditus Exp $
//
// License:     This code is released under QPL
// Copyright (C) 2003 Johan Persson
//========================================================================
*/

require_once ('jpgraph_plotmark.inc');


require_once "jpgraph_log.php";


DEFINE('POLAR_360',1);
DEFINE('POLAR_180',2);

//
// Note. Don't attempt to make sense of this code.
// In order not to have to be able to inherit the scaling code
// from the main graph package we have had to make some "tricks" since
// the original scaling and axis was not designed to do what is
// required here.
// There were two option. 1: Re-implement everything and get a clean design
// and 2: do some "small" trickery and be able to inherit most of
// the functionlity from the main graph package. 
// We choose 2: here in order to save some time.
// 

//--------------------------------------------------------------------------
// class PolarPlot
//--------------------------------------------------------------------------
class PolarPlot {
    public $line_style='solid',$mark;
    public $legendcsimtarget='';
    public $legendcsimalt='';
    public $legend="";
    public $csimtargets=array();        // Array of targets for CSIM
    public $csimareas="";                       // Resultant CSIM area tags     
    public $csimalts=null;                      // ALT:s for corresponding target
    public $scale=null;
    private $numpoints=0;
    private $iColor='navy',$iFillColor='';
    private $iLineWeight=1;
    private $coord=null;

    function PolarPlot($aData) {
        $n = count($aData);
        if( $n & 1 ) {
            JpGraphError::Raise('Polar plots must have an even number of data point. Each data point is a tuple (angle,radius).');
        }
        $this->numpoints = $n/2;
        $this->coord = $aData;
        $this->mark = new PlotMark();
    }

    function SetWeight($aWeight) {
        $this->iLineWeight = $aWeight;
    }

    function SetColor($aColor){
        $this->iColor = $aColor;
    }

    function SetFillColor($aColor){
        $this->iFillColor = $aColor;
    }

    function Max() {
        $m = $this->coord[1];
        $i=1;
        while( $i < $this->numpoints ) {
            $m = max($m,$this->coord[2*$i+1]);  
            ++$i;
        } 
        return $m;
    }
    // Set href targets for CSIM        
    function SetCSIMTargets($aTargets,$aAlts=null) {
        $this->csimtargets=$aTargets;
        $this->csimalts=$aAlts;         
    }
        
    // Get all created areas
    function GetCSIMareas() {
        return $this->csimareas;
    }   
        
    function SetLegend($aLegend,$aCSIM="",$aCSIMAlt="") {
        $this->legend = $aLegend;
        $this->legendcsimtarget = $aCSIM;
        $this->legendcsimalt = $aCSIMAlt;
    }

    // Private methods

    function Legend($aGraph) {
        $color = $this->iColor ;
        if( $this->legend != "" ) {
            if( $this->iFillColor!='' ) {
                $color = $this->iFillColor;
                $aGraph->legend->Add($this->legend,$color,$this->mark,0,
                                     $this->legendcsimtarget,$this->legendcsimalt);    
            }
            else {
                $aGraph->legend->Add($this->legend,$color,$this->mark,$this->line_style,
                                     $this->legendcsimtarget,$this->legendcsimalt);    
            }
        }
    }

    function Stroke($img,$scale) {

        $i=0;
        $p=array();
        $this->csimareas='';
        while($i < $this->numpoints) {
            list($x1,$y1) = $scale->PTranslate($this->coord[2*$i],$this->coord[2*$i+1]);
            $p[2*$i] = $x1;
            $p[2*$i+1] = $y1;
        
            if( isset($this->csimtargets[$i]) ) {
                $this->mark->SetCSIMTarget($this->csimtargets[$i]);
                $this->mark->SetCSIMAlt($this->csimalts[$i]);
                $this->mark->SetCSIMAltVal($this->coord[2*$i], $this->coord[2*$i+1]);
                $this->mark->Stroke($img,$x1,$y1);
                $this->csimareas .= $this->mark->GetCSIMAreas();
            }
            else
                $this->mark->Stroke($img,$x1,$y1);

            ++$i;
        }

        if( $this->iFillColor != '' ) {
            $img->SetColor($this->iFillColor);
            $img->FilledPolygon($p);
        }
        $img->SetLineWeight($this->iLineWeight);
        $img->SetColor($this->iColor);
        $img->Polygon($p,$this->iFillColor!='');
    }
}

//--------------------------------------------------------------------------
// class PolarAxis
//--------------------------------------------------------------------------
class PolarAxis extends Axis {
    private $angle_step=15,$angle_color='lightgray',$angle_label_color='black';
    private $angle_fontfam=FF_FONT1,$angle_fontstyle=FS_NORMAL,$angle_fontsize=10;
    private $angle_fontcolor = 'navy';
    private $gridminor_color='lightgray',$gridmajor_color='lightgray';
    private $show_minor_grid = false, $show_major_grid = true ;
    private $show_angle_mark=true, $show_angle_grid=true, $show_angle_label=true;
    private $angle_tick_len=3, $angle_tick_len2=3, $angle_tick_color='black';
    private $show_angle_tick=true;
    private $radius_tick_color='black';

    function PolarAxis($img,$aScale) {
        parent::Axis($img,$aScale);
    }

    function ShowAngleDegreeMark($aFlg=true) {
        $this->show_angle_mark = $aFlg;
    }

    function SetAngleStep($aStep) {
        $this->angle_step=$aStep;
    }

    function HideTicks($aFlg=true,$aAngleFlg=true) {
        parent::HideTicks($aFlg,$aFlg);
        $this->show_angle_tick = !$aAngleFlg;
    }

    function ShowAngleLabel($aFlg=true) {
        $this->show_angle_label = $aFlg;
    }

    function ShowGrid($aMajor=true,$aMinor=false,$aAngle=true) {
        $this->show_minor_grid = $aMinor;
        $this->show_major_grid = $aMajor;
        $this->show_angle_grid = $aAngle ;
    }

    function SetAngleFont($aFontFam,$aFontStyle=FS_NORMAL,$aFontSize=10) {
        $this->angle_fontfam = $aFontFam;
        $this->angle_fontstyle = $aFontStyle;
        $this->angle_fontsize = $aFontSize;
    }

    function SetColor($aColor,$aRadColor='',$aAngleColor='') {
        if( $aAngleColor == '' )
            $aAngleColor=$aColor;
        parent::SetColor($aColor,$aRadColor);
        $this->angle_fontcolor = $aAngleColor;
    }

    function SetGridColor($aMajorColor,$aMinorColor='',$aAngleColor='') {
        if( $aMinorColor == '' ) 
            $aMinorColor = $aMajorColor;
        if( $aAngleColor == '' ) 
            $aAngleColor = $aMajorColor;

        $this->gridminor_color = $aMinorColor;
        $this->gridmajor_color = $aMajorColor;
        $this->angle_color = $aAngleColor;
    }

    function SetTickColors($aRadColor,$aAngleColor='') {
        $this->radius_tick_color = $aRadColor;
        $this->angle_tick_color = $aAngleColor;
    }
    
    // Private methods
    function StrokeGrid($pos) {
        $x = round($this->img->left_margin + $this->img->plotwidth/2);
        $this->scale->ticks->Stroke($this->img,$this->scale,$pos);

        // Stroke the minor arcs 
        $pmin = array();
        $p = $this->scale->ticks->ticks_pos;
        $n = count($p);
        $i = 0;
        $this->img->SetColor($this->gridminor_color);
        while( $i < $n ) {
            $r = $p[$i]-$x+1;
            $pmin[]=$r;
            if( $this->show_minor_grid ) {
                $this->img->Circle($x,$pos,$r);
            }
            $i++;
        }
        
        $limit = max($this->img->plotwidth,$this->img->plotheight)*1.4 ;
        while( $r < $limit ) {
            $off = $r;
            $i=1;
            $r = $off + round($p[$i]-$x+1);
            while( $r < $limit && $i < $n ) {
                $r = $off+$p[$i]-$x;
                $pmin[]=$r;
                if( $this->show_minor_grid ) {
                    $this->img->Circle($x,$pos,$r);
                }
                $i++;
            }
        }

        // Stroke the major arcs 
        if( $this->show_major_grid ) {
            // First determine how many minor step on
            // every major step. We have recorded the minor radius
            // in pmin and use these values. This is done in order
            // to avoid rounding errors if we were to recalculate the
            // different major radius.
            $pmaj = $this->scale->ticks->maj_ticks_pos;
            $p = $this->scale->ticks->ticks_pos;
            if( $this->scale->name == 'lin' ) {
                $step=round(($pmaj[1] - $pmaj[0])/($p[1] - $p[0]));
            }
            else {
                $step=9;
            }
            $n = round(count($pmin)/$step);
            $i = 0;
            $this->img->SetColor($this->gridmajor_color);
            $limit = max($this->img->plotwidth,$this->img->plotheight)*1.4 ;
            $off = $r;
            $i=0;
            $r = $pmin[$i*$step];
            while( $r < $limit && $i < $n ) {
                $r = $pmin[$i*$step];
                $this->img->Circle($x,$pos,$r);
                $i++;
            }
        }

        // Draw angles
        if( $this->show_angle_grid ) {
            $this->img->SetColor($this->angle_color);
            $d = max($this->img->plotheight,$this->img->plotwidth)*1.4 ;
            $a = 0;
            $p = $this->scale->ticks->ticks_pos;
            $start_radius = $p[1]-$x;
            while( $a < 360 ) {
                if( $a == 90 || $a == 270 ) {
                    // Make sure there are no rounding problem with
                    // exactly vertical lines
                    $this->img->Line($x+$start_radius*cos($a/180*M_PI)+1,
                                     $pos-$start_radius*sin($a/180*M_PI),
                                     $x+$start_radius*cos($a/180*M_PI)+1,
                                     $pos-$d*sin($a/180*M_PI));
                    
                }
                else {
                    $this->img->Line($x+$start_radius*cos($a/180*M_PI)+1,
                                     $pos-$start_radius*sin($a/180*M_PI),
                                     $x+$d*cos($a/180*M_PI),
                                     $pos-$d*sin($a/180*M_PI));
                }
                $a += $this->angle_step;
            }
        }
    }

    function StrokeAngleLabels($pos,$type) {

        if( !$this->show_angle_label ) 
            return;
        
        $x0 = round($this->img->left_margin+$this->img->plotwidth/2)+1;

        $d = max($this->img->plotwidth,$this->img->plotheight)*1.42;
        $a = $this->angle_step;
        $t = new Text();
        $t->SetColor($this->angle_fontcolor);
        $t->SetFont($this->angle_fontfam,$this->angle_fontstyle,$this->angle_fontsize);
        $xright = $this->img->width - $this->img->right_margin;
        $ytop = $this->img->top_margin;
        $xleft = $this->img->left_margin;
        $ybottom = $this->img->height - $this->img->bottom_margin;
        $ha = 'left';
        $va = 'center';
        $w = $this->img->plotwidth/2;
        $h = $this->img->plotheight/2;
        $xt = $x0; $yt = $pos;
        $margin=5;

        $tl  = $this->angle_tick_len ; // Outer len
        $tl2 = $this->angle_tick_len2 ; // Interior len

        $this->img->SetColor($this->angle_tick_color);
        $rot90 = $this->img->a == 90 ;

        if( $type == POLAR_360 ) {
            $ca1 = atan($h/$w)/M_PI*180;
            $ca2 = 180-$ca1;
            $ca3 = $ca1+180;
            $ca4 = 360-$ca1;
            $end = 360;
            while( $a < $end ) {
                $ca = cos($a/180*M_PI);
                $sa = sin($a/180*M_PI);
                $x = $d*$ca;
                $y = $d*$sa;
                $xt=1000;$yt=1000;
                if( $a <= $ca1 || $a >= $ca4 ) {
                    $yt = $pos - $w * $y/$x;
                    $xt = $xright + $margin;
                    if( $rot90 ) {
                        $ha = 'center';
                        $va = 'top';
                    }
                    else {
                        $ha = 'left';
                        $va = 'center';
                    }
                    $x1=$xright-$tl2; $x2=$xright+$tl;
                    $y1=$y2=$yt;
                }
                elseif( $a > $ca1 && $a < $ca2 ) { 
                    $xt = $x0 + $h * $x/$y;
                    $yt = $ytop - $margin;
                    if( $rot90 ) {
                        $ha = 'left';
                        $va = 'center';
                    }
                    else {
                        $ha = 'center';
                        $va = 'bottom';
                    }
                    $y1=$ytop+$tl2;$y2=$ytop-$tl;
                    $x1=$x2=$xt;
                }
                elseif( $a >= $ca2 && $a <= $ca3 ) { 
                    $yt = $pos + $w * $y/$x;
                    $xt = $xleft - $margin;
                    if( $rot90 ) {
                        $ha = 'center';
                        $va = 'bottom';
                    }
                    else {
                        $ha = 'right';
                        $va = 'center';
                    }
                    $x1=$xleft+$tl2;$x2=$xleft-$tl;
                    $y1=$y2=$yt;
                }
                else { 
                    $xt = $x0 - $h * $x/$y;
                    $yt = $ybottom + $margin;
                    if( $rot90 ) {
                        $ha = 'right';
                        $va = 'center';
                    }
                    else {
                        $ha = 'center';
                        $va = 'top';
                    }
                    $y1=$ybottom-$tl2;$y2=$ybottom+$tl;
                    $x1=$x2=$xt;
                }
                if( $a != 0 && $a != 180 ) {
                    $t->Align($ha,$va);
                    if( $this->show_angle_mark )
                        $a .= '°';
                    $t->Set($a);
                    $t->Stroke($this->img,$xt,$yt);   
                    if( $this->show_angle_tick )
                        $this->img->Line($x1,$y1,$x2,$y2);
                }
                $a += $this->angle_step;
            }
        }
        else {
            // POLAR_HALF
            $ca1 = atan($h/$w*2)/M_PI*180;
            $ca2 = 180-$ca1;
            $end = 180;     
            while( $a < $end ) {
                $ca = cos($a/180*M_PI);
                $sa = sin($a/180*M_PI);
                $x = $d*$ca;
                $y = $d*$sa;
                if( $a <= $ca1 ) {
                    $yt = $pos - $w * $y/$x;
                    $xt = $xright + $margin;
                    if( $rot90 ) {
                        $ha = 'center';
                        $va = 'top';
                    }
                    else {
                        $ha = 'left';
                        $va = 'center';
                    }
                    $x1=$xright-$tl2; $x2=$xright+$tl;
                    $y1=$y2=$yt;
                }
                elseif( $a > $ca1 && $a < $ca2 ) { 
                    $xt = $x0 + 2*$h * $x/$y;
                    $yt = $ytop - $margin;
                    if( $rot90 ) {
                        $ha = 'left';
                        $va = 'center';
                    }
                    else {
                        $ha = 'center';
                        $va = 'bottom';
                    }
                    $y1=$ytop+$tl2;$y2=$ytop-$tl;
                    $x1=$x2=$xt;
                }
                elseif( $a >= $ca2 ) { 
                    $yt = $pos + $w * $y/$x;
                    $xt = $xleft - $margin;
                    if( $rot90 ) {
                        $ha = 'center';
                        $va = 'bottom';
                    }
                    else {
                        $ha = 'right';
                        $va = 'center';
                    }
                    $x1=$xleft+$tl2;$x2=$xleft-$tl;
                    $y1=$y2=$yt;
                }
                $t->Align($ha,$va);
                if( $this->show_angle_mark )
                    $a .= '°';
                $t->Set($a);
                $t->Stroke($this->img,$xt,$yt);  
                if( $this->show_angle_tick )
                    $this->img->Line($x1,$y1,$x2,$y2);  
                $a += $this->angle_step;
            }
        }
    }

    function Stroke($pos,$dummy=true) {

        $this->img->SetLineWeight($this->weight);
        $this->img->SetColor($this->color);             
        $this->img->SetFont($this->font_family,$this->font_style,$this->font_size);
        if( !$this->hide_line ) 
            $this->img->FilledRectangle($this->img->left_margin,$pos,
                     $this->img->width-$this->img->right_margin,$pos+$this->weight-1);
        $y=$pos+$this->img->GetFontHeight()+$this->title_margin+$this->title->margin;
        if( $this->title_adjust=="high" )
            $this->title->SetPos($this->img->width-$this->img->right_margin,$y,"right","top");
        elseif( $this->title_adjust=="middle" || $this->title_adjust=="center" ) 
            $this->title->SetPos(($this->img->width-$this->img->left_margin-
                               $this->img->right_margin)/2+$this->img->left_margin,
                              $y,"center","top");
        elseif($this->title_adjust=="low")
            $this->title->SetPos($this->img->left_margin,$y,"left","top");
        else {  
            JpGraphError::Raise('Unknown alignment specified for X-axis title. ('.
                                $this->title_adjust.')');
        }

        
        if (!$this->hide_labels) {
            $this->StrokeLabels($pos,false);
        }
        $this->img->SetColor($this->radius_tick_color);
        $this->scale->ticks->Stroke($this->img,$this->scale,$pos);

        //
        // Mirror the positions for the left side of the scale
        //
        $mid = 2*($this->img->left_margin+$this->img->plotwidth/2);
        $n = count($this->scale->ticks->ticks_pos);
        $i=0;
        while( $i < $n ) {
            $this->scale->ticks->ticks_pos[$i] = 
                $mid-$this->scale->ticks->ticks_pos[$i] ;
            ++$i;
        }

        $n = count($this->scale->ticks->maj_ticks_pos);
        $i=0;
        while( $i < $n ) {
            $this->scale->ticks->maj_ticks_pos[$i] = 
                $mid-$this->scale->ticks->maj_ticks_pos[$i] ;
            ++$i;
        }
        
        $n = count($this->scale->ticks->maj_ticklabels_pos);
        $i=1;
        while( $i < $n ) {
            $this->scale->ticks->maj_ticklabels_pos[$i] =
                $mid-$this->scale->ticks->maj_ticklabels_pos[$i] ;
            ++$i;
        }

        // Draw the left side of the scale
        $n = count($this->scale->ticks->ticks_pos);
        $yu = $pos - $this->scale->ticks->direction*$this->scale->ticks->GetMinTickAbsSize();


        // Minor ticks
        if( ! $this->scale->ticks->supress_minor_tickmarks ) {
            $i=1;
            while( $i < $n/2 ) {
                $x = round($this->scale->ticks->ticks_pos[$i]) ;
                $this->img->Line($x,$pos,$x,$yu);
                ++$i;
            }
        }

        $n = count($this->scale->ticks->maj_ticks_pos);
        $yu = $pos - $this->scale->ticks->direction*$this->scale->ticks->GetMajTickAbsSize();


        // Major ticks
        if( ! $this->scale->ticks->supress_tickmarks ) {
            $i=1;
            while( $i < $n/2 ) {
                $x = round($this->scale->ticks->maj_ticks_pos[$i]) ;
                $this->img->Line($x,$pos,$x,$yu);
                ++$i;
            }
        }
        if (!$this->hide_labels) {
            $this->StrokeLabels($pos,false);
        }
        $this->title->Stroke($this->img);       
    }
}

class PolarScale extends LinearScale {
    private $graph;

    function PolarScale($aMax=0,$graph) {
        parent::LinearScale(0,$aMax,'x');
        $this->graph = $graph;
    }

    function _Translate($v) {
        return parent::Translate($v);
    }

    function PTranslate($aAngle,$aRad) {
        
        $m = $this->scale[1];
        $w = $this->graph->img->plotwidth/2;
        $aRad = $aRad/$m*$w;

        $x = cos( $aAngle/180 * M_PI ) * $aRad;
        $y = sin( $aAngle/180 * M_PI ) * $aRad;

        $x += $this->_Translate(0);

        if( $this->graph->iType == POLAR_360 ) {
            $y = ($this->graph->img->top_margin + $this->graph->img->plotheight/2) - $y;
        }
        else {
            $y = ($this->graph->img->top_margin + $this->graph->img->plotheight) - $y;
        }
        return array($x,$y);
    }
}

class PolarLogScale extends LogScale {
    private $graph;
    function PolarLogScale($aMax=1,$graph) {
        parent::LogScale(0,$aMax,'x');
        $this->graph = $graph;
        $this->ticks->SetLabelLogType(LOGLABELS_MAGNITUDE);

    }

    function PTranslate($aAngle,$aRad) {

        if( $aRad == 0 ) 
            $aRad = 1;
        $aRad = log10($aRad);
        $m = $this->scale[1];
        $w = $this->graph->img->plotwidth/2;
        $aRad = $aRad/$m*$w;

        $x = cos( $aAngle/180 * M_PI ) * $aRad;
        $y = sin( $aAngle/180 * M_PI ) * $aRad;

        $x += $w+$this->graph->img->left_margin;//$this->_Translate(0);
        if( $this->graph->iType == POLAR_360 ) {
            $y = ($this->graph->img->top_margin + $this->graph->img->plotheight/2) - $y;
        }
        else {
            $y = ($this->graph->img->top_margin + $this->graph->img->plotheight) - $y;
        }
        return array($x,$y);
    }
}

class PolarGraph extends Graph {
    public $scale;
    public $axis;
    public $iType=POLAR_360;
    
    function PolarGraph($aWidth=300,$aHeight=200,$aCachedName="",$aTimeOut=0,$aInline=true) {
        parent::Graph($aWidth,$aHeight,$aCachedName,$aTimeOut,$aInline) ;
        $this->SetDensity(TICKD_DENSE);
        $this->SetBox();
        $this->SetMarginColor('white');
    }

    function SetDensity($aDense) {
        $this->SetTickDensity(TICKD_NORMAL,$aDense);
    }

    function Set90AndMargin($lm=0,$rm=0,$tm=0,$bm=0) {
        $adj = ($this->img->height - $this->img->width)/2;
        $this->SetAngle(90);
        $this->img->SetMargin($lm-$adj,$rm-$adj,$tm+$adj,$bm+$adj);
        $this->img->SetCenter(floor($this->img->width/2),floor($this->img->height/2));
        $this->axis->SetLabelAlign('right','center');
        //JpGraphError::Raise('Set90AndMargin() is not supported for polar graphs.');
    }

    function SetScale($aScale,$rmax=0,$dummy1=1,$dummy2=1,$dummy3=1) {
        if( $aScale == 'lin' ) 
            $this->scale = new PolarScale($rmax,$this);
        elseif( $aScale == 'log' ) {
            $this->scale = new PolarLogScale($rmax,$this);
        }
        else {
            JpGraphError::Raise('Unknown scale type for polar graph. Must be "lin" or "log"');
        }

        $this->axis = new PolarAxis($this->img,$this->scale);
        $this->SetMargin(40,40,50,40);
    }

    function SetType($aType) {
        $this->iType = $aType;
    }

    function SetPlotSize($w,$h) {
        $this->SetMargin(($this->img->width-$w)/2,($this->img->width-$w)/2,
                         ($this->img->height-$h)/2,($this->img->height-$h)/2);
    }

    // Private methods
    function GetPlotsMax() {
        $n = count($this->plots);
        $m = $this->plots[0]->Max();
        $i=1;
        while($i < $n) {
            $m = max($this->plots[$i]->Max());
            ++$i;
        }
        return $m;
    }

    function Stroke($aStrokeFileName="") {

        // Start by adjusting the margin so that potential titles will fit.
        $this->AdjustMarginsForTitles();
            
        // If the filename is the predefined value = '_csim_special_'
        // we assume that the call to stroke only needs to do enough
        // to correctly generate the CSIM maps.
        // We use this variable to skip things we don't strictly need
        // to do to generate the image map to improve performance
        // a best we can. Therefor you will see a lot of tests !$_csim in the
        // code below.
        $_csim = ($aStrokeFileName===_CSIM_SPECIALFILE);

        // We need to know if we have stroked the plot in the
        // GetCSIMareas. Otherwise the CSIM hasn't been generated
        // and in the case of GetCSIM called before stroke to generate
        // CSIM without storing an image to disk GetCSIM must call Stroke.
        $this->iHasStroked = true;

        //Check if we should autoscale axis
        if( !$this->scale->IsSpecified() && count($this->plots)>0 ) {
            $max = $this->GetPlotsMax();
            $t1 = $this->img->plotwidth;
            $this->img->plotwidth /= 2;
            $t2 = $this->img->left_margin;
            $this->img->left_margin += $this->img->plotwidth+1;
            $this->scale->AutoScale($this->img,0,$max,
                                     $this->img->plotwidth/$this->xtick_factor/2);
            $this->img->plotwidth = $t1;
            $this->img->left_margin = $t2;
        }
        else {
            // The tick calculation will use the user suplied min/max values to determine
            // the ticks. If auto_ticks is false the exact user specifed min and max
            // values will be used for the scale. 
            // If auto_ticks is true then the scale might be slightly adjusted
            // so that the min and max values falls on an even major step.
            //$min = 0;
            $max = $this->scale->scale[1];
            $t1 = $this->img->plotwidth;
            $this->img->plotwidth /= 2;
            $t2 = $this->img->left_margin;
            $this->img->left_margin += $this->img->plotwidth+1;
            $this->scale->AutoScale($this->img,0,$max,
                                     $this->img->plotwidth/$this->xtick_factor/2);
            $this->img->plotwidth = $t1;
            $this->img->left_margin = $t2;
        }

        if( $this->iType ==  POLAR_180 ) 
            $pos = $this->img->height - $this->img->bottom_margin;
        else
            $pos = $this->img->plotheight/2 + $this->img->top_margin;


        if( !$_csim ) {
            $this->StrokePlotArea();
        }

        $this->iDoClipping = true;

        if( $this->iDoClipping ) {
            $oldimage = $this->img->CloneCanvasH();
        }

        if( !$_csim ) {
            $this->axis->StrokeGrid($pos);
        }

        // Stroke all plots for Y1 axis
        for($i=0; $i < count($this->plots); ++$i) {
            $this->plots[$i]->Stroke($this->img,$this->scale);
        }                                               


        if( $this->iDoClipping ) {
            // Clipping only supports graphs at 0 and 90 degrees
            if( $this->img->a == 0  ) {
                $this->img->CopyCanvasH($oldimage,$this->img->img,
                                        $this->img->left_margin,$this->img->top_margin,
                                        $this->img->left_margin,$this->img->top_margin,
                                        $this->img->plotwidth+1,$this->img->plotheight+1);
            }
            elseif( $this->img->a == 90 ) {
                $adj = round(($this->img->height - $this->img->width)/2);
                $this->img->CopyCanvasH($oldimage,$this->img->img,
                                        $this->img->bottom_margin-$adj,$this->img->left_margin+$adj,
                                        $this->img->bottom_margin-$adj,$this->img->left_margin+$adj,
                                        $this->img->plotheight,$this->img->plotwidth);
            }
            $this->img->Destroy();
            $this->img->SetCanvasH($oldimage);
        }

        if( !$_csim ) {
            $this->axis->Stroke($pos);
            $this->axis->StrokeAngleLabels($pos,$this->iType);
        }

        if( !$_csim ) {
            $this->StrokePlotBox();
            $this->footer->Stroke($this->img);

            // The titles and legends never gets rotated so make sure
            // that the angle is 0 before stroking them                         
            $aa = $this->img->SetAngle(0);
            $this->StrokeTitles();
        }

        for($i=0; $i < count($this->plots) ; ++$i ) {
            $this->plots[$i]->Legend($this);
        }

        $this->legend->Stroke($this->img);              

        if( !$_csim ) {

            $this->StrokeTexts();       
            $this->img->SetAngle($aa);  
                        
            // Draw an outline around the image map     
            if(_JPG_DEBUG)
                $this->DisplayClientSideaImageMapAreas();               
            
            // Adjust the appearance of the image
            $this->AdjustSaturationBrightnessContrast();

            // If the filename is given as the special "__handle"
            // then the image handler is returned and the image is NOT
            // streamed back
            if( $aStrokeFileName == _IMG_HANDLER ) {
                return $this->img->img;
            }
            else {
                // Finally stream the generated picture                                 
                $this->cache->PutAndStream($this->img,$this->cache_name,$this->inline,
                                           $aStrokeFileName);           
            }
        }
    }
}



?>
