os-sim/www/graphs/jpgraph/gd_image.inc.php
<?php
//=======================================================================
// File:	GD_IMAGE.INC.PHP
// Description:	PHP Graph Plotting library. Low level image drawing routines
// Created: 	2001-01-08, refactored 2008-03-29
// Ver:		$Id: gd_image.inc.php,v 1.1 2009-06-09 08:31:21 root Exp $
//
// Copyright (c) Aditus Consulting. All rights reserved.
//========================================================================

	
//===================================================
// CLASS Image
// Description: Wrapper class with some goodies to form the
// Interface to low level image drawing routines.
//===================================================
class Image {
    public $left_margin=30,$right_margin=30,$top_margin=20,$bottom_margin=30;
    public $img=null;
    public $plotwidth=0,$plotheight=0;
    public $width=0, $height=0;
    public $rgb=null;
    public $current_color,$current_color_name;
    public $line_weight=1, $line_style=LINESTYLE_SOLID;	
    public $img_format;
    public $ttf=null;
    protected $expired=true;
    protected $lastx=0, $lasty=0;
    protected $obs_list=array();
    protected $font_size=12,$font_family=FF_FONT1, $font_style=FS_NORMAL;
    protected $font_file='';
    protected $text_halign="left",$text_valign="bottom";
    protected $use_anti_aliasing=false;
    protected $quality=null;
    protected $colorstack=array(),$colorstackidx=0;
    protected $canvascolor = 'white' ;
    protected $langconv = null ;
    protected $iInterlace=false;
    //---------------
    // CONSTRUCTOR
    function Image($aWidth,$aHeight,$aFormat=DEFAULT_GFORMAT,$aSetAutoMargin=true) {
	$this->CreateImgCanvas($aWidth,$aHeight);
	if( $aSetAutoMargin )
	    $this->SetAutoMargin();		

	if( !$this->SetImgFormat($aFormat) ) {
	    JpGraphError::RaiseL(25081,$aFormat);//("JpGraph: Selected graphic format is either not supported or unknown [$aFormat]");
	}
	$this->ttf = new TTF();
	$this->langconv = new LanguageConv();
    }

    // Enable interlacing in images
    function SetInterlace($aFlg=true) {
	$this->iInterlace=$aFlg;
    }

    // Should we use anti-aliasing. Note: This really slows down graphics!
    function SetAntiAliasing($aFlg=true) {
	$this->use_anti_aliasing = $aFlg;
	if( function_exists('imageantialias') ) {
	    imageantialias($this->img,$aFlg);
	}
	else {
	    JpGraphError::RaiseL(25128);//('The function imageantialias() is not available in your PHP installation. Use the GD version that comes with PHP and not the standalone version.')
	}
    }

    function CreateRawCanvas($aWidth=0,$aHeight=0) {
	if( $aWidth <= 1 || $aHeight <= 1 ) {
	    JpGraphError::RaiseL(25082,$aWidth,$aHeight);//("Illegal sizes specified for width or height when creating an image, (width=$aWidth, height=$aHeight)");
	}

	if( USE_TRUECOLOR ) {
	    $this->img = @imagecreatetruecolor($aWidth, $aHeight);
	    if( $this->img < 1 ) {
		JpGraphError::RaiseL(25126);
		//die("Can't create truecolor image. Check that you really have GD2 library installed.");
	    }
	    $this->SetAlphaBlending();
	} else {
	    $this->img = @imagecreate($aWidth, $aHeight);	
	    if( $this->img < 1 ) {
		JpGraphError::RaiseL(25126);
		//die("<b>JpGraph Error:</b> Can't create image. Check that you really have the GD library installed.");
	    }
	}

	if( $this->iInterlace ) {
	    imageinterlace($this->img,1);
	}
	if( $this->rgb != null ) 
	    $this->rgb->img = $this->img ;
	else
	    $this->rgb = new RGB($this->img);				
    }

    function CloneCanvasH() {
	$oldimage = $this->img;
	$this->CreateRawCanvas($this->width,$this->height);
	imagecopy($this->img,$oldimage,0,0,0,0,$this->width,$this->height);
	return $oldimage;
    }
    
    function CreateImgCanvas($aWidth=0,$aHeight=0) {

	$old = array($this->img,$this->width,$this->height);
	
	$aWidth = round($aWidth);
	$aHeight = round($aHeight);

	$this->width=$aWidth;
	$this->height=$aHeight;		

	
	if( $aWidth==0 || $aHeight==0 ) {
	    // We will set the final size later. 
	    // Note: The size must be specified before any other
	    // img routines that stroke anything are called.
	    $this->img = null;
	    $this->rgb = null;
	    return $old;
	}
	
	$this->CreateRawCanvas($aWidth,$aHeight);
	// Set canvas color (will also be the background color for a 
	// a pallett image
	$this->SetColor($this->canvascolor);	
	$this->FilledRectangle(0,0,$aWidth,$aHeight);

	return $old ;
    }

    function CopyCanvasH($aToHdl,$aFromHdl,$aToX,$aToY,$aFromX,$aFromY,$aWidth,$aHeight,$aw=-1,$ah=-1) {
	if( $aw === -1 ) {
	    $aw = $aWidth;
	    $ah = $aHeight;
	    $f = 'imagecopyresized';
	}
	else {
	    $f = 'imagecopyresampled';
	}
	$f($aToHdl,$aFromHdl,$aToX,$aToY,$aFromX,$aFromY, $aWidth,$aHeight,$aw,$ah);
    }

    function Copy($fromImg,$toX,$toY,$fromX,$fromY,$toWidth,$toHeight,$fromWidth=-1,$fromHeight=-1) {
	$this->CopyCanvasH($this->img,$fromImg,$toX,$toY,$fromX,$fromY,
			   $toWidth,$toHeight,$fromWidth,$fromHeight);
    }

    function CopyMerge($fromImg,$toX,$toY,$fromX,$fromY,$toWidth,$toHeight,$fromWidth=-1,$fromHeight=-1,$aMix=100) {
	if( $aMix == 100 ) {
	    $this->CopyCanvasH($this->img,$fromImg,
			       $toX,$toY,$fromX,$fromY,$toWidth,$toHeight,$fromWidth,$fromHeight);
	}
	else {
	    if( ($fromWidth  != -1 && ($fromWidth != $toWidth))  ||
		($fromHeight != -1 && ($fromHeight != $fromHeight)) ) {
		// Create a new canvas that will hold the re-scaled original from image
		if( $toWidth <= 1 || $toHeight <= 1 ) {
		    JpGraphError::RaiseL(25083);//('Illegal image size when copying image. Size for copied to image is 1 pixel or less.');
		}
		if( USE_TRUECOLOR ) {
		    $tmpimg = @imagecreatetruecolor($toWidth, $toHeight);
		} else {
		    $tmpimg = @imagecreate($toWidth, $toHeight);	
		}	    
		if( $tmpimg < 1 ) {
		    JpGraphError::RaiseL(25084);//('Failed to create temporary GD canvas. Out of memory ?');
		}
		$this->CopyCanvasH($tmpimg,$fromImg,0,0,0,0,
				   $toWidth,$toHeight,$fromWidth,$fromHeight);
		$fromImg = $tmpimg;
	    }
	    imagecopymerge($this->img,$fromImg,$toX,$toY,$fromX,$fromY,$toWidth,$toHeight,$aMix);
	}
    }

    function GetWidth($aImg=null) {
	if( $aImg === null ) 
	    $aImg = $this->img;
	return imagesx($aImg);
    }

    function GetHeight($aImg=null) {
	if( $aImg === null ) 
	    $aImg = $this->img;
	return imagesy($aImg);
    }
    
    static function CreateFromString($aStr) {
	$img = imagecreatefromstring($aStr);
	if( $img === false ) {
	    JpGraphError::RaiseL(25085);//('An image can not be created from the supplied string. It is either in a format not supported or the string is representing an corrupt image.');
	}
	return $img;
    }

    function SetCanvasH($aHdl) {
	$this->img = $aHdl;
	$this->rgb->img = $aHdl;
    }

    function SetCanvasColor($aColor) {
	$this->canvascolor = $aColor ;
    }

    function SetAlphaBlending($aFlg=true) {
	ImageAlphaBlending($this->img,$aFlg);
    }

	
    function SetAutoMargin() {	
	GLOBAL $gJpgBrandTiming;
	$min_bm=5;
	/*
	if( $gJpgBrandTiming )
	    $min_bm=15;		
	*/
	$lm = min(40,$this->width/7);
	$rm = min(20,$this->width/10);
	$tm = max(5,$this->height/7);
	$bm = max($min_bm,$this->height/7);
	$this->SetMargin($lm,$rm,$tm,$bm);		
    }

				
    //---------------
    // PUBLIC METHODS	
	
    function SetFont($family,$style=FS_NORMAL,$size=10) {
	$this->font_family=$family;
	$this->font_style=$style;
	$this->font_size=$size;
	$this->font_file='';
	if( ($this->font_family==FF_FONT1 || $this->font_family==FF_FONT2) && $this->font_style==FS_BOLD ){
	    ++$this->font_family;
	}
	if( $this->font_family > FF_FONT2+1 ) { // A TTF font so get the font file

	    // Check that this PHP has support for TTF fonts
	    if( !function_exists('imagettfbbox') ) {
		JpGraphError::RaiseL(25087);//('This PHP build has not been configured with TTF support. You need to recompile your PHP installation with FreeType support.');
	    }
	    $this->font_file = $this->ttf->File($this->font_family,$this->font_style);
	}
    }

    // Get the specific height for a text string
    function GetTextHeight($txt="",$angle=0) {
	$tmp = preg_split("/\n/",$txt);
	$n = count($tmp);
	$m=0;
	for($i=0; $i< $n; ++$i)
	    $m = max($m,strlen($tmp[$i]));

	if( $this->font_family <= FF_FONT2+1 ) {
	    if( $angle==0 ) {
		$h = imagefontheight($this->font_family);
		if( $h === false ) {
		    JpGraphError::RaiseL(25088);//('You have a misconfigured GD font support. The call to imagefontwidth() fails.');
		}

		return $n*$h;
	    }
	    else {
		$w = @imagefontwidth($this->font_family);
		if( $w === false ) {
		    JpGraphError::RaiseL(25088);//('You have a misconfigured GD font support. The call to imagefontwidth() fails.');
		}

		return $m*$w;
	    }
	}
	else {
	    $bbox = $this->GetTTFBBox($txt,$angle);
	    return $bbox[1]-$bbox[5];
	}
    }
	
    // Estimate font height
    function GetFontHeight($angle=0) {
	$txt = "XOMg";
	return $this->GetTextHeight($txt,$angle);
    }
	
    // Approximate font width with width of letter "O"
    function GetFontWidth($angle=0) {
	$txt = 'O';
	return $this->GetTextWidth($txt,$angle);
    }
	
    // Get actual width of text in absolute pixels
    function GetTextWidth($txt,$angle=0) {

	$tmp = preg_split("/\n/",$txt);
	$n = count($tmp);
	if( $this->font_family <= FF_FONT2+1 ) {

	    $m=0;
	    for($i=0; $i < $n; ++$i) {
		$l=strlen($tmp[$i]);
		if( $l > $m ) {
		    $m = $l;
		}
	    }

	    if( $angle==0 ) {
		$w = @imagefontwidth($this->font_family);
		if( $w === false ) {
		    JpGraphError::RaiseL(25088);//('You have a misconfigured GD font support. The call to imagefontwidth() fails.');
		}
		return $m*$w;
	    }
	    else {
		// 90 degrees internal so height becomes width
		$h = @imagefontheight($this->font_family); 
		if( $h === false ) {
		    JpGraphError::RaiseL(25089);//('You have a misconfigured GD font support. The call to imagefontheight() fails.');
		}
		return $n*$h;
	    }
	}
	else {
	    // For TTF fonts we must walk through a lines and find the 
	    // widest one which we use as the width of the multi-line
	    // paragraph
	    $m=0;
	    for( $i=0; $i < $n; ++$i ) {
		$bbox = $this->GetTTFBBox($tmp[$i],$angle);
		$mm =  $bbox[2] - $bbox[0];
		if( $mm > $m ) 
		    $m = $mm;
	    }
	    return $m;
	}
    }
	
    // Draw text with a box around it
    function StrokeBoxedText($x,$y,$txt,$dir=0,$fcolor="white",$bcolor="black",
			     $shadowcolor=false,$paragraph_align="left",
			     $xmarg=6,$ymarg=4,$cornerradius=0,$dropwidth=3) {

	if( !is_numeric($dir) ) {
	    if( $dir=="h" ) $dir=0;
	    elseif( $dir=="v" ) $dir=90;
	    else JpGraphError::RaiseL(25090,$dir);//(" Unknown direction specified in call to StrokeBoxedText() [$dir]");
	}
		
	if( $this->font_family >= FF_FONT0 && $this->font_family <= FF_FONT2+1) {	
	    $width=$this->GetTextWidth($txt,$dir) ;
	    $height=$this->GetTextHeight($txt,$dir) ;
	}
	else {
	    $width=$this->GetBBoxWidth($txt,$dir) ;
	    $height=$this->GetBBoxHeight($txt,$dir) ;
	}

	$height += 2*$ymarg;
	$width  += 2*$xmarg;

	if( $this->text_halign=="right" ) $x -= $width;
	elseif( $this->text_halign=="center" ) $x -= $width/2;
	if( $this->text_valign=="bottom" ) $y -= $height;
	elseif( $this->text_valign=="center" ) $y -= $height/2;
	
	$olda = $this->SetAngle(0);

	if( $shadowcolor ) {
	    $this->PushColor($shadowcolor);
	    $this->FilledRoundedRectangle($x-$xmarg+$dropwidth,$y-$ymarg+$dropwidth,
					  $x+$width+$dropwidth,$y+$height-$ymarg+$dropwidth,
					  $cornerradius);
	    $this->PopColor();
	    $this->PushColor($fcolor);
	    $this->FilledRoundedRectangle($x-$xmarg,$y-$ymarg,
					  $x+$width,$y+$height-$ymarg,
					  $cornerradius);		
	    $this->PopColor();
	    $this->PushColor($bcolor);
	    $this->RoundedRectangle($x-$xmarg,$y-$ymarg,
				    $x+$width,$y+$height-$ymarg,$cornerradius);
	    $this->PopColor();
	}
	else {
	    if( $fcolor ) {
		$oc=$this->current_color;
		$this->SetColor($fcolor);
		$this->FilledRoundedRectangle($x-$xmarg,$y-$ymarg,$x+$width,$y+$height-$ymarg,$cornerradius);
		$this->current_color=$oc;
	    }
	    if( $bcolor ) {
		$oc=$this->current_color;
		$this->SetColor($bcolor);			
		$this->RoundedRectangle($x-$xmarg,$y-$ymarg,$x+$width,$y+$height-$ymarg,$cornerradius);
		$this->current_color=$oc;			
	    }
	}
		
	$h=$this->text_halign;
	$v=$this->text_valign;
	$this->SetTextAlign("left","top");
	$this->StrokeText($x, $y, $txt, $dir, $paragraph_align);
	$bb = array($x-$xmarg,$y+$height-$ymarg,$x+$width,$y+$height-$ymarg,
		    $x+$width,$y-$ymarg,$x-$xmarg,$y-$ymarg);
	$this->SetTextAlign($h,$v);

	$this->SetAngle($olda);

	return $bb;
    }

    // Set text alignment	
    function SetTextAlign($halign,$valign="bottom") {
	$this->text_halign=$halign;
	$this->text_valign=$valign;
    }
	

    function _StrokeBuiltinFont($x,$y,$txt,$dir=0,$paragraph_align="left",&$aBoundingBox,$aDebug=false) {

	if( is_numeric($dir) && $dir!=90 && $dir!=0) 
	    JpGraphError::RaiseL(25091);//(" Internal font does not support drawing text at arbitrary angle. Use TTF fonts instead.");

	$h=$this->GetTextHeight($txt);
	$fh=$this->GetFontHeight();
	$w=$this->GetTextWidth($txt);
	
	if( $this->text_halign=="right") 				
	    $x -= $dir==0 ? $w : $h;
	elseif( $this->text_halign=="center" ) {
	    // For center we subtract 1 pixel since this makes the middle
	    // be prefectly in the middle
	    $x -= $dir==0 ? $w/2-1 : $h/2;
	}
	if( $this->text_valign=="top" )
	    $y += $dir==0 ? $h : $w;
	elseif( $this->text_valign=="center" ) 				
	    $y += $dir==0 ? $h/2 : $w/2;
	
	if( $dir==90 ) {
	    imagestringup($this->img,$this->font_family,$x,$y,$txt,$this->current_color);
	    $aBoundingBox = array(round($x),round($y),round($x),round($y-$w),round($x+$h),round($y-$w),round($x+$h),round($y));
            if( $aDebug ) {
		// Draw bounding box
		$this->PushColor('green');
		$this->Polygon($aBoundingBox,true);
		$this->PopColor();
	    }
	}
	else {
	    if( preg_match("/\n/",$txt) ) { 
		$tmp = preg_split("/\n/",$txt);
		for($i=0; $i < count($tmp); ++$i) {
		    $w1 = $this->GetTextWidth($tmp[$i]);
		    if( $paragraph_align=="left" ) {
			imagestring($this->img,$this->font_family,$x,$y-$h+1+$i*$fh,$tmp[$i],$this->current_color);
		    }
		    elseif( $paragraph_align=="right" ) {
			imagestring($this->img,$this->font_family,$x+($w-$w1),
				    $y-$h+1+$i*$fh,$tmp[$i],$this->current_color);
		    }
		    else {
			imagestring($this->img,$this->font_family,$x+$w/2-$w1/2,
				    $y-$h+1+$i*$fh,$tmp[$i],$this->current_color);
		    }
		}
	    } 
	    else {
		//Put the text
		imagestring($this->img,$this->font_family,$x,$y-$h+1,$txt,$this->current_color);
	    }
            if( $aDebug ) {
		// Draw the bounding rectangle and the bounding box
		$p1 = array(round($x),round($y),round($x),round($y-$h),round($x+$w),round($y-$h),round($x+$w),round($y));
		
		// Draw bounding box
		$this->PushColor('green');
		$this->Polygon($p1,true);
		$this->PopColor();

            }
	    $aBoundingBox=array(round($x),round($y),round($x),round($y-$h),round($x+$w),round($y-$h),round($x+$w),round($y));
	}
    }

    function AddTxtCR($aTxt) {
	// If the user has just specified a '\n'
	// instead of '\n\t' we have to add '\r' since
	// the width will be too muchy otherwise since when
	// we print we stroke the individually lines by hand.
	$e = explode("\n",$aTxt);
	$n = count($e);
	for($i=0; $i<$n; ++$i) {
	    $e[$i]=str_replace("\r","",$e[$i]);
	}
	return implode("\n\r",$e);
    }

    function GetTTFBBox($aTxt,$aAngle=0) {
	$bbox = @ImageTTFBBox($this->font_size,$aAngle,$this->font_file,$aTxt);
	if( $bbox === false ) {
	    JpGraphError::RaiseL(25092,$this->font_file);
//("There is either a configuration problem with TrueType or a problem reading font file (".$this->font_file."). Make sure file exists and is in a readable place for the HTTP process. (If 'basedir' restriction is enabled in PHP then the font file must be located in the document root.). It might also be a wrongly installed FreeType library. Try uppgrading to at least FreeType 2.1.13 and recompile GD with the correct setup so it can find the new FT library.");
	}
	return $bbox;
    }

    function GetBBoxTTF($aTxt,$aAngle=0) {
	// Normalize the bounding box to become a minimum
	// enscribing rectangle

	$aTxt = $this->AddTxtCR($aTxt);

	if( !is_readable($this->font_file) ) {
	    JpGraphError::RaiseL(25093,$this->font_file);
//('Can not read font file ('.$this->font_file.') in call to Image::GetBBoxTTF. Please make sure that you have set a font before calling this method and that the font is installed in the TTF directory.');
	}
	$bbox = $this->GetTTFBBox($aTxt,$aAngle);

	if( $aAngle==0 ) 
	    return $bbox;
	if( $aAngle >= 0 ) {
	    if(  $aAngle <= 90 ) { //<=0		
		$bbox = array($bbox[6],$bbox[1],$bbox[2],$bbox[1],
			      $bbox[2],$bbox[5],$bbox[6],$bbox[5]);
	    }
	    elseif(  $aAngle <= 180 ) { //<= 2
		$bbox = array($bbox[4],$bbox[7],$bbox[0],$bbox[7],
			      $bbox[0],$bbox[3],$bbox[4],$bbox[3]);
	    }
	    elseif(  $aAngle <= 270 )  { //<= 3
		$bbox = array($bbox[2],$bbox[5],$bbox[6],$bbox[5],
			      $bbox[6],$bbox[1],$bbox[2],$bbox[1]);
	    }
	    else {
		$bbox = array($bbox[0],$bbox[3],$bbox[4],$bbox[3],
			      $bbox[4],$bbox[7],$bbox[0],$bbox[7]);
	    }
	}
	elseif(  $aAngle < 0 ) {
	    if( $aAngle <= -270 ) { // <= -3
		$bbox = array($bbox[6],$bbox[1],$bbox[2],$bbox[1],
			      $bbox[2],$bbox[5],$bbox[6],$bbox[5]);
	    }
	    elseif( $aAngle <= -180 ) { // <= -2
		$bbox = array($bbox[0],$bbox[3],$bbox[4],$bbox[3],
			      $bbox[4],$bbox[7],$bbox[0],$bbox[7]);
	    }
	    elseif( $aAngle <= -90 ) { // <= -1
		$bbox = array($bbox[2],$bbox[5],$bbox[6],$bbox[5],
			      $bbox[6],$bbox[1],$bbox[2],$bbox[1]);
	    }
	    else {
		$bbox = array($bbox[0],$bbox[3],$bbox[4],$bbox[3],
			      $bbox[4],$bbox[7],$bbox[0],$bbox[7]);
	    }
	}	
	return $bbox;
    }

    function GetBBoxHeight($aTxt,$aAngle=0) {
	$box = $this->GetBBoxTTF($aTxt,$aAngle);
	return $box[1]-$box[7]+1;
    }

    function GetBBoxWidth($aTxt,$aAngle=0) {
	$box = $this->GetBBoxTTF($aTxt,$aAngle);
	return $box[2]-$box[0]+1;	
    }

    function _StrokeTTF($x,$y,$txt,$dir=0,$paragraph_align="left",&$aBoundingBox,$debug=false) {

	// Setupo default inter line margin for paragraphs to
	// 25% of the font height.
	$ConstLineSpacing = 0.25 ;

	// Remember the anchor point before adjustment
	if( $debug ) {
	    $ox=$x;
	    $oy=$y;
	}

	if( !preg_match("/\n/",$txt) || ($dir>0 && preg_match("/\n/",$txt)) ) {
	    // Format a single line

	    $txt = $this->AddTxtCR($txt);

	    $bbox=$this->GetBBoxTTF($txt,$dir);
	    
	    // Align x,y ot lower left corner of bbox
	    $x -= $bbox[0];
	    $y -= $bbox[1];

	    // Note to self: "topanchor" is deprecated after we changed the
	    // bopunding box stuff. 
	    if( $this->text_halign=="right" || $this->text_halign=="topanchor" ) 
		$x -= $bbox[2]-$bbox[0];
	    elseif( $this->text_halign=="center" ) $x -= ($bbox[2]-$bbox[0])/2; 
	    
	    if( $this->text_valign=="top" ) $y += abs($bbox[5])+$bbox[1];
	    elseif( $this->text_valign=="center" ) $y -= ($bbox[5]-$bbox[1])/2; 

	    ImageTTFText ($this->img, $this->font_size, $dir, $x, $y, 
			  $this->current_color,$this->font_file,$txt); 

	    // Calculate and return the co-ordinates for the bounding box
	    $box=@ImageTTFBBox($this->font_size,$dir,$this->font_file,$txt);
	    $p1 = array();


	    for($i=0; $i < 4; ++$i) {
		$p1[] = round($box[$i*2]+$x);
		$p1[] = round($box[$i*2+1]+$y);
	    }
	    $aBoundingBox = $p1;

	    // Debugging code to highlight the bonding box and bounding rectangle
	    // For text at 0 degrees the bounding box and bounding rectangle are the
	    // same
            if( $debug ) {
		// Draw the bounding rectangle and the bounding box
		$box=@ImageTTFBBox($this->font_size,$dir,$this->font_file,$txt);
		$p = array();
		$p1 = array();
		for($i=0; $i < 4; ++$i) {
		    $p[] = $bbox[$i*2]+$x;
		    $p[] = $bbox[$i*2+1]+$y;
		    $p1[] = $box[$i*2]+$x;
		    $p1[] = $box[$i*2+1]+$y;
		}

		// Draw bounding box
		$this->PushColor('green');
		$this->Polygon($p1,true);
		$this->PopColor();
		
		// Draw bounding rectangle
		$this->PushColor('darkgreen');
		$this->Polygon($p,true);
		$this->PopColor();
		
		// Draw a cross at the anchor point
		$this->PushColor('red');
		$this->Line($ox-15,$oy,$ox+15,$oy);
		$this->Line($ox,$oy-15,$ox,$oy+15);
		$this->PopColor();
            }
	}
	else {
	    // Format a text paragraph
	    $fh=$this->GetFontHeight();

	    // Line margin is 25% of font height
	    $linemargin=round($fh*$ConstLineSpacing);
	    $fh += $linemargin;
	    $w=$this->GetTextWidth($txt);

	    $y -= $linemargin/2;
	    $tmp = preg_split("/\n/",$txt);
	    $nl = count($tmp);
	    $h = $nl * $fh;

	    if( $this->text_halign=="right") 				
		$x -= $dir==0 ? $w : $h;
	    elseif( $this->text_halign=="center" ) {
		$x -= $dir==0 ? $w/2 : $h/2;
	    }
	    
	    if( $this->text_valign=="top" )
		$y +=	$dir==0 ? $h : $w;
	    elseif( $this->text_valign=="center" ) 				
		$y +=	$dir==0 ? $h/2 : $w/2;

	    // Here comes a tricky bit. 
	    // Since we have to give the position for the string at the
	    // baseline this means thaht text will move slightly up
	    // and down depending on any of it's character descend below
	    // the baseline, for example a 'g'. To adjust the Y-position
	    // we therefore adjust the text with the baseline Y-offset
	    // as used for the current font and size. This will keep the
	    // baseline at a fixed positoned disregarding the actual 
	    // characters in the string. 
	    $standardbox = $this->GetTTFBBox('Gg',$dir);
	    $yadj = $standardbox[1];
	    $xadj = $standardbox[0];
	    $aBoundingBox = array();
	    for($i=0; $i < $nl; ++$i) {
		$wl = $this->GetTextWidth($tmp[$i]);
		$bbox = $this->GetTTFBBox($tmp[$i],$dir);
		if( $paragraph_align=="left" ) {
		    $xl = $x; 
		}
		elseif( $paragraph_align=="right" ) {
		    $xl = $x + ($w-$wl);
		}
		else {
		    // Center
		    $xl = $x + $w/2 - $wl/2 ;
		}

		$xl -= $bbox[0];
		$yl = $y - $yadj; 
		$xl = $xl - $xadj; 
		ImageTTFText ($this->img, $this->font_size, $dir, 
			      $xl, $yl-($h-$fh)+$fh*$i,
			      $this->current_color,$this->font_file,$tmp[$i]); 

		if( $debug  ) {
		    // Draw the bounding rectangle around each line
		    $box=@ImageTTFBBox($this->font_size,$dir,$this->font_file,$tmp[$i]);
		    $p = array();
		    for($j=0; $j < 4; ++$j) {
			$p[] = $bbox[$j*2]+$xl;
			$p[] = $bbox[$j*2+1]+$yl-($h-$fh)+$fh*$i;
		    }
		    
		    // Draw bounding rectangle
		    $this->PushColor('darkgreen');
		    $this->Polygon($p,true);
		    $this->PopColor();
		}
	    }

	    // Get the bounding box
	    $bbox = $this->GetBBoxTTF($txt,$dir);
	    for($j=0; $j < 4; ++$j) {
		$bbox[$j*2]+= round($x);
		$bbox[$j*2+1]+= round($y - ($h-$fh) - $yadj);
	    }
	    $aBoundingBox = $bbox;

	    if( $debug ) {	
		// Draw a cross at the anchor point
		$this->PushColor('red');
		$this->Line($ox-25,$oy,$ox+25,$oy);
		$this->Line($ox,$oy-25,$ox,$oy+25);
		$this->PopColor();
	    }

	}
    }
	
    function StrokeText($x,$y,$txt,$dir=0,$paragraph_align="left",$debug=false) {

	$x = round($x);
	$y = round($y);

	// Do special language encoding
	$txt = $this->langconv->Convert($txt,$this->font_family);

	if( !is_numeric($dir) )
	    JpGraphError::RaiseL(25094);//(" Direction for text most be given as an angle between 0 and 90.");
			
	if( $this->font_family >= FF_FONT0 && $this->font_family <= FF_FONT2+1) {	
	    $this->_StrokeBuiltinFont($x,$y,$txt,$dir,$paragraph_align,$boundingbox,$debug);
	}
	elseif($this->font_family >= _FIRST_FONT && $this->font_family <= _LAST_FONT)  {
	    $this->_StrokeTTF($x,$y,$txt,$dir,$paragraph_align,$boundingbox,$debug);
	}
	else
	    JpGraphError::RaiseL(25095);//(" Unknown font font family specification. ");
	return $boundingbox;
    }
	
    function SetMargin($lm,$rm,$tm,$bm) {
	$this->left_margin=$lm;
	$this->right_margin=$rm;
	$this->top_margin=$tm;
	$this->bottom_margin=$bm;
	$this->plotwidth=$this->width - $this->left_margin-$this->right_margin ; 
	$this->plotheight=$this->height - $this->top_margin-$this->bottom_margin ;
	if( $this->width  > 0 && $this->height > 0 ) {
	    if( $this->plotwidth < 0  || $this->plotheight < 0 )
		JpGraphError::raise("To small plot area. ($lm,$rm,$tm,$bm : $this->plotwidth x $this->plotheight). With the given image size and margins there is to little space left for the plot. Increase the plot size or reduce the margins.");
	}
    }

    function SetTransparent($color) {
	imagecolortransparent ($this->img,$this->rgb->allocate($color));
    }
	
    function SetColor($color,$aAlpha=0) {
	$this->current_color_name = $color;
	$this->current_color=$this->rgb->allocate($color,$aAlpha);
	if( $this->current_color == -1 ) {
	    $tc=imagecolorstotal($this->img);
	    JpGraphError::RaiseL(25096);
//("Can't allocate any more colors. Image has already allocated maximum of <b>$tc colors</b>. This might happen if you have anti-aliasing turned on together with a background image or perhaps gradient fill since this requires many, many colors. Try to turn off anti-aliasing. If there is still a problem try downgrading the quality of the background image to use a smaller pallete to leave some entries for your graphs. You should try to limit the number of colors in your background image to 64. If there is still problem set the constant DEFINE(\"USE_APPROX_COLORS\",true); in jpgraph.php This will use approximative colors when the palette is full. Unfortunately there is not much JpGraph can do about this since the palette size is a limitation of current graphic format and what the underlying GD library suppports."); 
	}
	return $this->current_color;
    }
	
    function PushColor($color) {
	if( $color != "" ) {
	    $this->colorstack[$this->colorstackidx]=$this->current_color_name;
	    $this->colorstack[$this->colorstackidx+1]=$this->current_color;
	    $this->colorstackidx+=2;
	    $this->SetColor($color);
	}
	else {
	    JpGraphError::RaiseL(25097);//("Color specified as empty string in PushColor().");
	}
    }
	
    function PopColor() {
	if($this->colorstackidx<1)
	    JpGraphError::RaiseL(25098);//(" Negative Color stack index. Unmatched call to PopColor()");
	$this->current_color=$this->colorstack[--$this->colorstackidx];
	$this->current_color_name=$this->colorstack[--$this->colorstackidx];
    }
	
	
    function SetLineWeight($weight) {
	imagesetthickness($this->img,$weight);
	$this->line_weight = $weight;
    }
	
    function SetStartPoint($x,$y) {
	$this->lastx=round($x);
	$this->lasty=round($y);
    }
	
    function Arc($cx,$cy,$w,$h,$s,$e) {
	// GD Arc doesn't like negative angles
	while( $s < 0) $s += 360;
	while( $e < 0) $e += 360;
    	
	imagearc($this->img,round($cx),round($cy),round($w),round($h),
		 $s,$e,$this->current_color);
    }
    
    function FilledArc($xc,$yc,$w,$h,$s,$e,$style='') {
	while( $s < 0 ) $s += 360;
	while( $e < 0 ) $e += 360;
	if( $style=='' ) 
	    $style=IMG_ARC_PIE;
	if( abs($s-$e) > 0.001 ) {
	    imagefilledarc($this->img,round($xc),round($yc),round($w),round($h),
			   round($s),round($e),$this->current_color,$style);
	}
    }

    function FilledCakeSlice($cx,$cy,$w,$h,$s,$e) {
	$this->CakeSlice($cx,$cy,$w,$h,$s,$e,$this->current_color_name);
    }

    function CakeSlice($xc,$yc,$w,$h,$s,$e,$fillcolor="",$arccolor="") {
	$s = round($s); $e = round($e);
	$w = round($w); $h = round($h);
	$xc = round($xc); $yc = round($yc);
	if( $s ==$e ) {
	    // A full circle. We draw this a plain circle
	    $this->PushColor($fillcolor);
	    imagefilledellipse($this->img,$xc,$yc,2*$w,2*$h,$this->current_color);
	    $this->PopColor();
	    $this->PushColor($arccolor);
	    imageellipse($this->img,$xc,$yc,2*$w,2*$h,$this->current_color);
	    $this->Line($xc,$yc,cos($s*M_PI/180)*$w+$xc,$yc+sin($s*M_PI/180)*$h);
	    $this->PopColor();
	}
	else {
	    $this->PushColor($fillcolor);
	    $this->FilledArc($xc,$yc,2*$w,2*$h,$s,$e);
	    $this->PopColor();
	    if( $arccolor != "" ) {
		$this->PushColor($arccolor);
		// We add 2 pixels to make the Arc() better aligned with
		// the filled arc. 
		imagefilledarc($this->img,$xc,$yc,2*$w,2*$h,$s,$e,$this->current_color,IMG_ARC_NOFILL | IMG_ARC_EDGED ) ;
		$this->PopColor();
	    }
	}
    }

    function Ellipse($xc,$yc,$w,$h) {
	$this->Arc($xc,$yc,$w,$h,0,360);
    }
			
    function Circle($xc,$yc,$r) {
	imageellipse($this->img,round($xc),round($yc),$r*2,$r*2,$this->current_color);
    }
	
    function FilledCircle($xc,$yc,$r) {
	imagefilledellipse($this->img,round($xc),round($yc),2*$r,2*$r,$this->current_color);
    }
	
    // Linear Color InterPolation
    function lip($f,$t,$p) {
	$p = round($p,1);
	$r = $f[0] + ($t[0]-$f[0])*$p;
	$g = $f[1] + ($t[1]-$f[1])*$p;
	$b = $f[2] + ($t[2]-$f[2])*$p;
	return array($r,$g,$b);
    }

    // Set line style dashed, dotted etc
    function SetLineStyle($s) {
	if( is_numeric($s) ) {
	    if( $s<1 || $s>4 ) 
		JpGraphError::RaiseL(25101,$s);//(" Illegal numeric argument to SetLineStyle(): ($s)");
	}
	elseif( is_string($s) ) {
	    if( $s == "solid" ) $s=1;
	    elseif( $s == "dotted" ) $s=2;
	    elseif( $s == "dashed" ) $s=3;
	    elseif( $s == "longdashed" ) $s=4;
	    else JpGraphError::RaiseL(25102,$s);//(" Illegal string argument to SetLineStyle(): $s");
	}
	else { 
	    JpGraphError::RaiseL(25103,$s);//(" Illegal argument to SetLineStyle $s");
	}
	$old = $this->line_style;
	$this->line_style=$s;
	return $old;
    }
	
    // Same as Line but take the line_style into account
    function StyleLine($x1,$y1,$x2,$y2,$aStyle='') {
	if( $this->line_weight <= 0 )
	    return;

	if( $aStyle === '' ) {
	    $aStyle = $this->line_style;
	}

	// Add error check since dashed line will only work if anti-alias is disabled
	// this is a limitation in GD

	switch( $aStyle ) {
	    case 1:// Solid
		$this->Line($x1,$y1,$x2,$y2);
		break;
	    case 2: // Dotted
		$this->DashedLine($x1,$y1,$x2,$y2,2,6);
		break;
	    case 3: // Dashed
		$this->DashedLine($x1,$y1,$x2,$y2,5,9);
		break;
	    case 4: // Longdashes
		$this->DashedLine($x1,$y1,$x2,$y2,9,13);
		break;
	    default:
		JpGraphError::RaiseL(25104,$this->line_style);//(" Unknown line style: $this->line_style ");
		break;
	}
    }
	
    function DashedLine($x1,$y1,$x2,$y2,$dash_length=1,$dash_space=4) {

	if( $this->line_weight <= 0 )
	    return;

	// Add error check to make sure anti-alias is not enabled.
	// Dashed line does not work with anti-alias enabled. This 
	// is a limitation in GD.
	if( $this->use_anti_aliasing ) {
	    JpGraphError::RaiseL(25129); // Anti-alias can not be used with dashed lines. Please disable anti-alias or use solid lines. 
	}
	

	$x1 = round($x1);
	$x2 = round($x2);
	$y1 = round($y1);
	$y2 = round($y2);

	$style = array_fill(0,$dash_length,$this->current_color);
	$style = array_pad($style,$dash_space,IMG_COLOR_TRANSPARENT);
	imagesetstyle($this->img, $style);
	imageline($this->img, $x1, $y1, $x2, $y2, IMG_COLOR_STYLED);
	$this->lastx=$x2; $this->lasty=$y2;		
    } 

    function Line($x1,$y1,$x2,$y2) {

	if( $this->line_weight <= 0 )
	    return;

	$x1 = round($x1);
	$x2 = round($x2);
	$y1 = round($y1);
	$y2 = round($y2);

	imageline($this->img,$x1,$y1,$x2,$y2,$this->current_color);
	$this->lastx=$x2; $this->lasty=$y2;		
    }

    function Polygon($p,$closed=FALSE,$fast=FALSE) {

	if( $this->line_weight <= 0 ) 
	    return;

	$n=count($p);
	$oldx = $p[0];
	$oldy = $p[1];
	if( $fast ) {
	    for( $i=2; $i < $n; $i+=2 ) {
		imageline($this->img,$oldx,$oldy,$p[$i],$p[$i+1],$this->current_color);
		$oldx = $p[$i];
		$oldy = $p[$i+1];
	    }
	    if( $closed ) {
		imageline($this->img,$p[$n*2-2],$p[$n*2-1],$p[0],$p[1],$this->current_color);
	    }
	}
	else {
	    for( $i=2; $i < $n; $i+=2 ) {
		$this->StyleLine($oldx,$oldy,$p[$i],$p[$i+1]);
		$oldx = $p[$i];
		$oldy = $p[$i+1];
	    }
	    if( $closed )
		$this->StyleLine($oldx,$oldy,$p[0],$p[1]);
	}
    }
	
    function FilledPolygon($pts) {
	$n=count($pts);
	if( $n == 0 ) {
	    JpGraphError::RaiseL(25105);//('NULL data specified for a filled polygon. Check that your data is not NULL.');
	}
	for($i=0; $i < $n; ++$i) 
	    $pts[$i] = round($pts[$i]);
	imagefilledpolygon($this->img,$pts,count($pts)/2,$this->current_color);
    }
	
    function Rectangle($xl,$yu,$xr,$yl) {
	$this->Polygon(array($xl,$yu,$xr,$yu,$xr,$yl,$xl,$yl,$xl,$yu));
    }
	
    function FilledRectangle($xl,$yu,$xr,$yl) {
	$this->FilledPolygon(array($xl,$yu,$xr,$yu,$xr,$yl,$xl,$yl));
    }

    function FilledRectangle2($xl,$yu,$xr,$yl,$color1,$color2,$style=1) {
	// Fill a rectangle with lines of two colors
	if( $style===1 ) {
	    // Horizontal stripe
	    if( $yl < $yu ) {
		$t = $yl; $yl=$yu; $yu=$t;
	    }
	    for( $y=$yu; $y <= $yl; ++$y) {
		$this->SetColor($color1);
		$this->Line($xl,$y,$xr,$y);
		++$y;
		$this->SetColor($color2);
		$this->Line($xl,$y,$xr,$y);
	    }
	}
	else {
	    if( $xl < $xl ) {
		$t = $xl; $xl=$xr; $xr=$t;
	    }
	    for( $x=$xl; $x <= $xr; ++$x) {
		$this->SetColor($color1);
		$this->Line($x,$yu,$x,$yl);
		++$x;
		$this->SetColor($color2);
		$this->Line($x,$yu,$x,$yl);
	    }
	}
    }

    function ShadowRectangle($xl,$yu,$xr,$yl,$fcolor=false,$shadow_width=3,$shadow_color=array(102,102,102)) {
	// This is complicated by the fact that we must also handle the case where
        // the reactangle has no fill color
	$this->PushColor($shadow_color);
	$this->FilledRectangle($xr-$shadow_width,$yu+$shadow_width,$xr,$yl-$shadow_width-1);
	$this->FilledRectangle($xl+$shadow_width,$yl-$shadow_width,$xr,$yl);
	//$this->FilledRectangle($xl+$shadow_width,$yu+$shadow_width,$xr,$yl);
	$this->PopColor();
	if( $fcolor==false )
	    $this->Rectangle($xl,$yu,$xr-$shadow_width-1,$yl-$shadow_width-1);
	else {		
	    $this->PushColor($fcolor);
	    $this->FilledRectangle($xl,$yu,$xr-$shadow_width-1,$yl-$shadow_width-1);
	    $this->PopColor();
	    $this->Rectangle($xl,$yu,$xr-$shadow_width-1,$yl-$shadow_width-1);
	}
    }

    function FilledRoundedRectangle($xt,$yt,$xr,$yl,$r=5) {
	if( $r==0 ) {
	    $this->FilledRectangle($xt,$yt,$xr,$yl);
	    return;
	}

	// To avoid overlapping fillings (which will look strange
	// when alphablending is enabled) we have no choice but 
	// to fill the five distinct areas one by one.
	
	// Center square
	$this->FilledRectangle($xt+$r,$yt+$r,$xr-$r,$yl-$r);
	// Top band
	$this->FilledRectangle($xt+$r,$yt,$xr-$r,$yt+$r-1);
	// Bottom band
	$this->FilledRectangle($xt+$r,$yl-$r+1,$xr-$r,$yl);
	// Left band
	$this->FilledRectangle($xt,$yt+$r+1,$xt+$r-1,$yl-$r);
	// Right band
	$this->FilledRectangle($xr-$r+1,$yt+$r,$xr,$yl-$r);

	// Topleft & Topright arc
	$this->FilledArc($xt+$r,$yt+$r,$r*2,$r*2,180,270);
	$this->FilledArc($xr-$r,$yt+$r,$r*2,$r*2,270,360);

	// Bottomleft & Bottom right arc
	$this->FilledArc($xt+$r,$yl-$r,$r*2,$r*2,90,180);
	$this->FilledArc($xr-$r,$yl-$r,$r*2,$r*2,0,90);

    }

    function RoundedRectangle($xt,$yt,$xr,$yl,$r=5) {    

	if( $r==0 ) {
	    $this->Rectangle($xt,$yt,$xr,$yl);
	    return;
	}

	// Top & Bottom line
	$this->Line($xt+$r,$yt,$xr-$r,$yt);
	$this->Line($xt+$r,$yl,$xr-$r,$yl);

	// Left & Right line
	$this->Line($xt,$yt+$r,$xt,$yl-$r);
	$this->Line($xr,$yt+$r,$xr,$yl-$r);

	// Topleft & Topright arc
	$this->Arc($xt+$r,$yt+$r,$r*2,$r*2,180,270);
	$this->Arc($xr-$r,$yt+$r,$r*2,$r*2,270,360);

	// Bottomleft & Bottomright arc
	$this->Arc($xt+$r,$yl-$r,$r*2,$r*2,90,180);
	$this->Arc($xr-$r,$yl-$r,$r*2,$r*2,0,90);
    }

    function FilledBevel($x1,$y1,$x2,$y2,$depth=2,$color1='white@0.4',$color2='darkgray@0.4') {
	$this->FilledRectangle($x1,$y1,$x2,$y2);
	$this->Bevel($x1,$y1,$x2,$y2,$depth,$color1,$color2);
    }

    function Bevel($x1,$y1,$x2,$y2,$depth=2,$color1='white@0.4',$color2='black@0.5') {
	$this->PushColor($color1);
	for( $i=0; $i < $depth; ++$i ) {
	    $this->Line($x1+$i,$y1+$i,$x1+$i,$y2-$i);
	    $this->Line($x1+$i,$y1+$i,$x2-$i,$y1+$i);
	}
	$this->PopColor();
	
	$this->PushColor($color2);
	for( $i=0; $i < $depth; ++$i ) {
	    $this->Line($x1+$i,$y2-$i,$x2-$i,$y2-$i);
	    $this->Line($x2-$i,$y1+$i,$x2-$i,$y2-$i-1);
	}
	$this->PopColor();
    }

    function StyleLineTo($x,$y) {
	$this->StyleLine($this->lastx,$this->lasty,$x,$y);
	$this->lastx=$x;
	$this->lasty=$y;
    }
	
    function LineTo($x,$y) {
	$this->Line($this->lastx,$this->lasty,$x,$y);
	$this->lastx=$x;
	$this->lasty=$y;
    }
	
    function Point($x,$y) {
	imagesetpixel($this->img,round($x),round($y),$this->current_color);
    }
	
    function Fill($x,$y) {
	imagefill($this->img,round($x),round($y),$this->current_color);
    }

    function FillToBorder($x,$y,$aBordColor) {
	$bc = $this->rgb->allocate($aBordColor);
	if( $bc == -1 ) {
	    JpGraphError::RaiseL(25106);//('Image::FillToBorder : Can not allocate more colors');
	}
	imagefilltoborder($this->img,round($x),round($y),$bc,$this->current_color);
    }

    function SetExpired($aFlg=true) {
	$this->expired = $aFlg;
    }
	
    // Generate image header
    function Headers() {
	
	// In case we are running from the command line with the client version of
	// PHP we can't send any headers.
	$sapi = php_sapi_name();
	if( $sapi == 'cli' )
	    return;

	// These parameters are set by headers_sent() but they might cause
	// an undefined variable error unless they are initilized
	$file='';
	$lineno='';
	if( headers_sent($file,$lineno) ) {
	    $file=basename($file);	    
	    $t = new ErrMsgText();
	    $msg = $t->Get(10,$file,$lineno);
	    die($msg);
	}	
	
	if ($this->expired) {
	    header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
	    header("Last-Modified: " . gmdate("D, d M Y H:i:s") . "GMT");
	    header("Cache-Control: no-cache, must-revalidate");
	    header("Pragma: no-cache");
	}
	header("Content-type: image/$this->img_format");
    }

    // Adjust image quality for formats that allow this
    function SetQuality($q) {
	$this->quality = $q;
    }
	
    // Stream image to browser or to file
    function Stream($aFile="") {
	$func="image".$this->img_format;
	if( $this->img_format=="jpeg" && $this->quality != null ) {
	    $res = @$func($this->img,$aFile,$this->quality);
	}
	else {
	    if( $aFile != "" ) {
		$res = @$func($this->img,$aFile);
		if( !$res )
		    JpGraphError::RaiseL(25107,$aFile);//("Can't write to file '$aFile'. Check that the process running PHP has enough permission.");
	    }
	    else {
		$res = @$func($this->img);
		if( !$res )
		    JpGraphError::RaiseL(25108);//("Can't stream image. This is most likely due to a faulty PHP/GD setup. Try to recompile PHP and use the built-in GD library that comes with PHP.");
		
	    }
	}
    }
		
    // Clear resource tide up by image
    function Destroy() {
	imagedestroy($this->img);
    }
	
    // Specify image format. Note depending on your installation
    // of PHP not all formats may be supported.
    function SetImgFormat($aFormat,$aQuality=75) {		
	$this->quality = $aQuality;
	$aFormat = strtolower($aFormat);
	$tst = true;
	$supported = imagetypes();
	if( $aFormat=="auto" ) {
	    if( $supported & IMG_PNG )
		$this->img_format="png";
	    elseif( $supported & IMG_JPG )
		$this->img_format="jpeg";
	    elseif( $supported & IMG_GIF )
		$this->img_format="gif";
	    elseif( $supported & IMG_WBMP )
		$this->img_format="wbmp";
	    elseif( $supported & IMG_XPM )
		$this->img_format="xpm";
	    else
		JpGraphError::RaiseL(25109);//("Your PHP (and GD-lib) installation does not appear to support any known graphic formats. You need to first make sure GD is compiled as a module to PHP. If you also want to use JPEG images you must get the JPEG library. Please see the PHP docs for details.");
				
	    return true;
	}
	else {
	    if( $aFormat=="jpeg" || $aFormat=="png" || $aFormat=="gif" ) {
		if( $aFormat=="jpeg" && !($supported & IMG_JPG) )
		    $tst=false;
		elseif( $aFormat=="png" && !($supported & IMG_PNG) ) 
		    $tst=false;
		elseif( $aFormat=="gif" && !($supported & IMG_GIF) ) 	
		    $tst=false;
		elseif( $aFormat=="wbmp" && !($supported & IMG_WBMP) ) 	
		    $tst=false;
		elseif( $aFormat=="xpm" && !($supported & IMG_XPM) ) 	
		    $tst=false;
		else {
		    $this->img_format=$aFormat;
		    return true;
		}
	    }
	    else 
		$tst=false;
	    if( !$tst )
		JpGraphError::RaiseL(25110,$aFormat);//(" Your PHP installation does not support the chosen graphic format: $aFormat");
	}
    }	
} // CLASS

//===================================================
// CLASS RotImage
// Description: Exactly as Image but draws the image at
// a specified angle around a specified rotation point.
//===================================================
class RotImage extends Image {
    public $a=0;
    public $dx=0,$dy=0,$transx=0,$transy=0; 
    private $m=array();
	
    function RotImage($aWidth,$aHeight,$a=0,$aFormat=DEFAULT_GFORMAT,$aSetAutoMargin=true) {
	$this->Image($aWidth,$aHeight,$aFormat,$aSetAutoMargin);
	$this->dx=$this->left_margin+$this->plotwidth/2;
	$this->dy=$this->top_margin+$this->plotheight/2;
	$this->SetAngle($a);	
    }
	
    function SetCenter($dx,$dy) {
	$old_dx = $this->dx;
	$old_dy = $this->dy;
	$this->dx=$dx;
	$this->dy=$dy;
	$this->SetAngle($this->a);
	return array($old_dx,$old_dy);
    }
	
    function SetTranslation($dx,$dy) {
	$old = array($this->transx,$this->transy);
	$this->transx = $dx;
	$this->transy = $dy;
	return $old;
    }

    function UpdateRotMatrice()  {
	$a = $this->a;
	$a *= M_PI/180;
	$sa=sin($a); $ca=cos($a);		
	// Create the rotation matrix
	$this->m[0][0] = $ca;
	$this->m[0][1] = -$sa;
	$this->m[0][2] = $this->dx*(1-$ca) + $sa*$this->dy ;
	$this->m[1][0] = $sa;
	$this->m[1][1] = $ca;
	$this->m[1][2] = $this->dy*(1-$ca) - $sa*$this->dx ;
    }

    function SetAngle($a) {
	$tmp = $this->a;
	$this->a = $a;
	$this->UpdateRotMatrice();
	return $tmp;
    }

    function Circle($xc,$yc,$r) {
	list($xc,$yc) = $this->Rotate($xc,$yc);
	parent::Circle($xc,$yc,$r);
    }

    function FilledCircle($xc,$yc,$r) {
	list($xc,$yc) = $this->Rotate($xc,$yc);
	parent::FilledCircle($xc,$yc,$r);
    }

	
    function Arc($xc,$yc,$w,$h,$s,$e) {
	list($xc,$yc) = $this->Rotate($xc,$yc);
	$s += $this->a;
	$e += $this->a;
	parent::Arc($xc,$yc,$w,$h,$s,$e);
    }

    function FilledArc($xc,$yc,$w,$h,$s,$e,$style='') {
	list($xc,$yc) = $this->Rotate($xc,$yc);
	$s += $this->a;
	$e += $this->a;
	parent::FilledArc($xc,$yc,$w,$h,$s,$e);
    }

    function SetMargin($lm,$rm,$tm,$bm) {
	parent::SetMargin($lm,$rm,$tm,$bm);
	$this->dx=$this->left_margin+$this->plotwidth/2;
	$this->dy=$this->top_margin+$this->plotheight/2;
	$this->UpdateRotMatrice();
    }
	
    function Rotate($x,$y) {
	// Optimization. Ignore rotation if Angle==0 || Angle==360
	if( $this->a == 0 || $this->a == 360 ) {
	    return array($x + $this->transx, $y + $this->transy );
	}
	else {
	    $x1=round($this->m[0][0]*$x + $this->m[0][1]*$y,1) + $this->m[0][2] + $this->transx;
	    $y1=round($this->m[1][0]*$x + $this->m[1][1]*$y,1) + $this->m[1][2] + $this->transy;
	    return array($x1,$y1);
	}
    }
	
    function CopyMerge($fromImg,$toX,$toY,$fromX,$fromY,$toWidth,$toHeight,$fromWidth=-1,$fromHeight=-1,$aMix=100) {
	list($toX,$toY) = $this->Rotate($toX,$toY);
	parent::CopyMerge($fromImg,$toX,$toY,$fromX,$fromY,$toWidth,$toHeight,$fromWidth,$fromHeight,$aMix);

    }

    function ArrRotate($pnts) {
	$n = count($pnts)-1;
	for($i=0; $i < $n; $i+=2) {
	    list ($x,$y) = $this->Rotate($pnts[$i],$pnts[$i+1]);
	    $pnts[$i] = $x; $pnts[$i+1] = $y;
	}
	return $pnts;
    }

    function DashedLine($x1,$y1,$x2,$y2,$dash_length=1,$dash_space=4) {
	list($x1,$y1) = $this->Rotate($x1,$y1);
	list($x2,$y2) = $this->Rotate($x2,$y2);
	parent::DashedLine($x1,$y1,$x2,$y2,$dash_length,$dash_space);
    }
	
    function Line($x1,$y1,$x2,$y2) {
	list($x1,$y1) = $this->Rotate($x1,$y1);
	list($x2,$y2) = $this->Rotate($x2,$y2);
	parent::Line($x1,$y1,$x2,$y2);
    }

    function Rectangle($x1,$y1,$x2,$y2) {
	// Rectangle uses Line() so it will be rotated through that call
	parent::Rectangle($x1,$y1,$x2,$y2);
    }
	
    function FilledRectangle($x1,$y1,$x2,$y2) {
	if( $y1==$y2 || $x1==$x2 )
	    $this->Line($x1,$y1,$x2,$y2);
	else 
	    $this->FilledPolygon(array($x1,$y1,$x2,$y1,$x2,$y2,$x1,$y2));
    }
	
    function Polygon($pnts,$closed=FALSE,$fast=FALSE) {
	// Polygon uses Line() so it will be rotated through that call unless
	// fast drawing routines are used in which case a rotate is needed
	if( $fast ) {
	    parent::Polygon($this->ArrRotate($pnts));
	}
	else
	    parent::Polygon($pnts,$closed,$fast);
    }
	
    function FilledPolygon($pnts) {
	parent::FilledPolygon($this->ArrRotate($pnts));
    }
	
    function Point($x,$y) {
	list($xp,$yp) = $this->Rotate($x,$y);
	parent::Point($xp,$yp);
    }
	
    function StrokeText($x,$y,$txt,$dir=0,$paragraph_align="left",$debug=false) {
	list($xp,$yp) = $this->Rotate($x,$y);
	return parent::StrokeText($xp,$yp,$txt,$dir,$paragraph_align,$debug);
    }
}

//===================================================
// CLASS ImgStreamCache
// Description: Handle caching of graphs to files
//===================================================
class ImgStreamCache {
    private $cache_dir, $img=null, $timeout=0; 	// Infinite timeout
    //---------------
    // CONSTRUCTOR
    function ImgStreamCache($aImg, $aCacheDir=CACHE_DIR) {
	$this->img = $aImg;
	$this->cache_dir = $aCacheDir;
    }

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

    // Specify a timeout (in minutes) for the file. If the file is older then the
    // timeout value it will be overwritten with a newer version.
    // If timeout is set to 0 this is the same as infinite large timeout and if
    // timeout is set to -1 this is the same as infinite small timeout
    function SetTimeout($aTimeout) {
	$this->timeout=$aTimeout;	
    }
	
    // Output image to browser and also write it to the cache
    function PutAndStream($aImage,$aCacheFileName,$aInline,$aStrokeFileName) {
	// Some debugging code to brand the image with numbe of colors
	// used
	GLOBAL $gJpgBrandTiming;

	if( $gJpgBrandTiming ) {
	    global $tim;
	    $t=$tim->Pop()/1000.0;
	    $c=$aImage->SetColor("black");
	    $t=sprintf(BRAND_TIME_FORMAT,round($t,3));
	    imagestring($this->img->img,2,5,$this->img->height-20,$t,$c);			
	}

	// Check if we should stroke the image to an arbitrary file
	if( _FORCE_IMGTOFILE ) {
	    $aStrokeFileName = _FORCE_IMGDIR.GenImgName();
	}

	if( $aStrokeFileName!="" ) {
	    if( $aStrokeFileName == "auto" )
		$aStrokeFileName = GenImgName();
	    if( file_exists($aStrokeFileName) ) {
		// Delete the old file
		if( !@unlink($aStrokeFileName) )
		    JpGraphError::RaiseL(25111,$aStrokeFileName);//(" Can't delete cached image $aStrokeFileName. Permission problem?");
	    }
	    $aImage->Stream($aStrokeFileName);
	    return;
	}

	if( $aCacheFileName != "" && USE_CACHE) {

	    $aCacheFileName = $this->cache_dir . $aCacheFileName;
	    if( file_exists($aCacheFileName) ) {
		if( !$aInline ) {
		    // If we are generating image off-line (just writing to the cache)
		    // and the file exists and is still valid (no timeout)
		    // then do nothing, just return.
		    $diff=time()-filemtime($aCacheFileName);
		    if( $diff < 0 )
			JpGraphError::RaiseL(25112,$aCacheFileName);//(" Cached imagefile ($aCacheFileName) has file date in the future!!");
		    if( $this->timeout>0 && ($diff <= $this->timeout*60) ) 
			return;		
		}			
		if( !@unlink($aCacheFileName) )
		    JpGraphError::RaiseL(25113,$aStrokeFileName);//(" Can't delete cached image $aStrokeFileName. Permission problem?");
		$aImage->Stream($aCacheFileName);	
	    }
	    else {
		$this->MakeDirs(dirname($aCacheFileName));
		if( !is_writeable(dirname($aCacheFileName)) ) {
		    JpGraphError::RaiseL(25114,$aCacheFileName);//('PHP has not enough permissions to write to the cache file '.$aCacheFileName.'. Please make sure that the user running PHP has write permission for this file if you wan to use the cache system with JpGraph.');
		}
		$aImage->Stream($aCacheFileName);
	    }
			
	    $res=true;
	    // Set group to specified
	    if( CACHE_FILE_GROUP != "" )
		$res = @chgrp($aCacheFileName,CACHE_FILE_GROUP);
	    if( CACHE_FILE_MOD != "" )
		$res = @chmod($aCacheFileName,CACHE_FILE_MOD);
	    if( !$res )
		JpGraphError::RaiseL(25115,$aStrokeFileName);//(" Can't set permission for cached image $aStrokeFileName. Permission problem?");
			
	    $aImage->Destroy();
	    if( $aInline ) {
		if ($fh = @fopen($aCacheFileName, "rb") ) {
		    $this->img->Headers();
		    fpassthru($fh);
		    return;
		}
		else
		    JpGraphError::RaiseL(25116,$aFile);//(" Cant open file from cache [$aFile]"); 
	    }
	}
	elseif( $aInline ) {
	    $this->img->Headers();	 		
	    $aImage->Stream();	
	    return;
	}
    }
	
    // Check if a given image is in cache and in that case
    // pass it directly on to web browser. Return false if the
    // image file doesn't exist or exists but is to old
    function GetAndStream($aCacheFileName) {
	$aCacheFileName = $this->cache_dir.$aCacheFileName;		 
	if ( USE_CACHE && file_exists($aCacheFileName) && $this->timeout>=0 ) {
	    $diff=time()-filemtime($aCacheFileName);
	    if( $this->timeout>0 && ($diff > $this->timeout*60) ) {
		return false;		
	    }
	    else {
		if ($fh = @fopen($aCacheFileName, "rb")) {
		    $this->img->Headers();
		    fpassthru($fh);
		    return true;
		}
		else
		    JpGraphError::RaiseL(25117,$aCacheFileName);//(" Can't open cached image \"$aCacheFileName\" for reading.");
	    }
	} 
	return false;
    }
	
    //---------------
    // PRIVATE METHODS	
    // Create all necessary directories in a path
    function MakeDirs($aFile) {
	$dirs = array();
	while ( !(file_exists($aFile)) ) {
	    $dirs[] = $aFile;
	    $aFile = dirname($aFile);
	}
	for ($i = sizeof($dirs)-1; $i>=0; $i--) {
	    if(! @mkdir($dirs[$i],0777) )
		JpGraphError::RaiseL(25118,$aFile);//(" Can't create directory $aFile. Make sure PHP has write permission to this directory.");
	    // We also specify mode here after we have changed group. 
	    // This is necessary if Apache user doesn't belong the
	    // default group and hence can't specify group permission
	    // in the previous mkdir() call
	    if( CACHE_FILE_GROUP != "" ) {
		$res=true;
		$res =@chgrp($dirs[$i],CACHE_FILE_GROUP);
		$res = @chmod($dirs[$i],0777);
		if( !$res )
		    JpGraphError::RaiseL(25119,$aFile);//(" Can't set permissions for $aFile. Permission problems?");
	    }
	}
	return true;
    }	
} // CLASS Cache


?>
