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<?php

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

// File: 	JPGRAPH_POLAR.PHP

// Description:	Polar plot extension for JpGraph

// Created: 	2003-02-02

// Ver:		$Id: jpgraph_polar.php 868 2007-03-24 11:19:13Z ljp $

//

// Copyright (c) Aditus Consulting. All rights reserved.

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

*/

require_once ('jpgraph_plotmark.inc.php');

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 {

    var $numpoints=0;

    var $iColor='navy',$iFillColor='';

    var $iLineWeight=1;

    var $coord=null;

    var $legendcsimtarget='';

    var $legendcsimalt='';

    var $legend="";

    var $csimtargets=array();	// Array of targets for CSIM

    var $csimareas="";			// Resultant CSIM area tags

    var $csimalts=null;			// ALT:s for corresponding target

    var $line_style='solid',$mark;

    function PolarPlot($aData) {

	$n = count($aData);

	if( $n & 1 ) {

	    JpGraphError::RaiseL(17001);

//('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 {

    var $angle_step=15,$angle_color='lightgray',$angle_label_color='black';

    var $angle_fontfam=FF_FONT1,$angle_fontstyle=FS_NORMAL,$angle_fontsize=10;

    var $angle_fontcolor = 'navy';

    var $gridminor_color='lightgray',$gridmajor_color='lightgray';

    var $show_minor_grid = false, $show_major_grid = true ;

    var $show_angle_mark=true, $show_angle_grid=true, $show_angle_label=true;

    var $angle_tick_len=3, $angle_tick_len2=3, $angle_tick_color='black';

    var $show_angle_tick=true;

    var $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) {

	$this->img->SetLineWeight($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" )

	    $this->title->Pos($this->img->width-$this->img->right_margin,$y,"right","top");

	elseif( $this->title_adjust=="middle" || $this->title_adjust=="center" )

	    $this->title->Pos(($this->img->width-$this->img->left_margin-

			       $this->img->right_margin)/2+$this->img->left_margin,

			      $y,"center","top");

	elseif($this->title_adjust=="low")

	    $this->title->Pos($this->img->left_margin,$y,"left","top");

	else {

	    JpGraphError::RaiseL(17002,$this->title_adjust);

//('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 {

    var $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 {

    var $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 {

    var $scale;

    var $iType=POLAR_360;

    var $axis;

    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) {

	if( $aScale == 'lin' )

	    $this->scale = new PolarScale($rmax,$this);

	elseif( $aScale == 'log' ) {

	    $this->scale = new PolarLogScale($rmax,$this);

	}

	else {

	    JpGraphError::RaiseL(17004);//('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[$i]->Max(),$m);

	    ++$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();

	    // 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);

	    }

	}

    }

}

?>