jpgraph_pie.php

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<?php
/*=======================================================================
// File:	JPGRAPH_PIE.PHP
// Description:	Pie plot extension for JpGraph
// Created: 	2001-02-14
// Author:	Johan Persson ([e-mail])
// Ver:		$Id: jpgraph_pie.php,v 1.5 2003/10/10 03:37:56 wwf Exp $
//
// License:	This code is released under QPL
// Copyright (C) 2001,2002 Johan Persson
//========================================================================
*/


// Defines for PiePlot::SetLabelType()
DEFINE("PIE_VALUE_ABS",1);
DEFINE("PIE_VALUE_PER",0);
DEFINE("PIE_VALUE_PERCENTAGE",0);

//===================================================
// CLASS PiePlot
// Description: Draws a pie plot
//===================================================
class PiePlot {
    var $posx=0.5,$posy=0.5;
    var $radius=0.3;
    var $explode_radius=array(),$explode_all=false,$explode_r=20;
    var $labels=null, $legends=null;
    var $csimtargets=null;  // Array of targets for CSIM
    var $csimareas='';		// Generated CSIM text	
    var $csimalts=null;		// ALT tags for corresponding target
    var $data=null;
    var $title;
    var $startangle=0;
    var $weight=1, $color="black";
    var $legend_margin=6,$show_labels=true;
    var $themearr = array(
	"earth" 	=> array(136,34,40,45,46,62,63,134,74,10,120,136,141,168,180,77,209,218,346,395,89,430),
	"pastel" => array(27,415,128,59,66,79,105,110,42,147,152,230,236,240,331,337,405,38),
	"water"  => array(8,370,24,40,335,56,213,237,268,14,326,387,10,388),
	"sand"   => array(27,168,34,170,19,50,65,72,131,209,46,393));
    var $theme="earth";
    var $setslicecolors=array();
    var $labeltype=0; // Default to percentage
    var $pie_border=true,$pie_interior_border=true;
    var $value;
    var $ishadowcolor='',$ishadowdrop=4;
    var $ilabelposadj=1;
    var $legendcsimtargets = array();
    var $legendcsimalts = array();
	
//---------------
// CONSTRUCTOR
    function PiePlot($data) {
	$this->data = array_reverse($data);
	$this->title = new Text("");
	$this->title->SetFont(FF_FONT1,FS_BOLD);
	$this->value = new DisplayValue();
	$this->value->Show();
	$this->value->SetFormat('%.1f%%');
    }

//---------------
// PUBLIC METHODS	
    function SetCenter($x,$y=0.5) {
	$this->posx = $x;
	$this->posy = $y;
    }

    function SetColor($aColor) {
	$this->color = $aColor;
    }
	
    function SetSliceColors($aColors) {
	$this->setslicecolors = $aColors;
    }
	
    function SetShadow($aColor='darkgray',$aDropWidth=4) {
	$this->ishadowcolor = $aColor;
	$this->ishadowdrop = $aDropWidth;
    }

    function SetCSIMTargets($targets,$alts=null) {
	$this->csimtargets=array_reverse($targets);
	if( is_array($alts) )
	    $this->csimalts=array_reverse($alts);
    }
	
    function GetCSIMareas() {
	return $this->csimareas;
    }

    function AddSliceToCSIM($i,$xc,$yc,$radius,$sa,$ea) {  
        //Slice number, ellipse centre (x,y), height, width, start angle, end angle
	while( $sa > 2*M_PI ) $sa = $sa - 2*M_PI;
	while( $ea > 2*M_PI ) $ea = $ea - 2*M_PI;

	$sa = 2*M_PI - $sa;
	$ea = 2*M_PI - $ea;

	//add coordinates of the centre to the map
	$coords = "$xc, $yc";

	//add coordinates of the first point on the arc to the map
	$xp = floor(($radius*cos($ea))+$xc);
	$yp = floor($yc-$radius*sin($ea));
	$coords.= ", $xp, $yp";
	
	//add coordinates every 0.2 radians
	$a=$ea+0.2;
	while ($a<$sa) {
	    $xp = floor($radius*cos($a)+$xc);
	    $yp = floor($yc-$radius*sin($a));
	    $coords.= ", $xp, $yp";
	    $a += 0.2;
	}
		
	//Add the last point on the arc
	$xp = floor($radius*cos($sa)+$xc);
	$yp = floor($yc-$radius*sin($sa));
	$coords.= ", $xp, $yp";
	if( !empty($this->csimtargets[$i]) )
	    $this->csimareas .= "<area shape=\"poly\" coords=\"$coords\" href=\"".
		$this->csimtargets[$i]."\"";
	if( !empty($this->csimalts[$i]) ) {
	    $tmp=sprintf($this->csimalts[$i],$this->data[$i]);
	    $this->csimareas .= " alt=\"$tmp\" title=\"$tmp\"";
	}
	$this->csimareas .= ">\n";
    }

	
    function SetTheme($aTheme) {
	if( in_array($aTheme,array_keys($this->themearr)) )
	    $this->theme = $aTheme;
	else
	    JpGraphError::Raise("PiePLot::SetTheme() Unknown theme: $aTheme");
    }
	
    function ExplodeSlice($e,$radius=20) {
	$this->explode_radius[$e]=$radius;
    }

    function ExplodeAll($radius=20) {
	$this->explode_all=true;
	$this->explode_r = $radius;
    }

    function Explode($aExplodeArr) {
	if( !is_array($aExplodeArr) ) {
	    JpGraphError::Raise("Argument to PiePlot::Explode() must be an array.");
	}
	$this->explode_radius = $aExplodeArr;
    }

    function SetStartAngle($aStart) {
	if( $aStart < 0 || $aStart > 360 ) {
	    JpGraphError::Raise('Slice start angle must be between 0 and 360 degrees.');
	}
	$this->startangle = 360-$aStart;
    }
	
    function SetFont($family,$style=FS_NORMAL,$size=10) {
		JpGraphError::Raise('PiePlot::SetFont() is deprecated. Use PiePlot->value->SetFont() instead.');
    }
	
    // Size in percentage
    function SetSize($aSize) {
	if( ($aSize>0 && $aSize<=0.5) || ($aSize>10 && $aSize<1000) )
	    $this->radius = $aSize;
	else
	    JpGraphError::Raise("PiePlot::SetSize() Radius for pie must either be specified as a fraction
                                [0, 0.5] of the size of the image or as an absolute size in pixels 
                                in the range [10, 1000]");
    }
	
    function SetFontColor($aColor) {
	JpGraphError::Raise('PiePlot::SetFontColor() is deprecated. Use PiePlot->value->SetColor() instead.');
    }
	
    // Set label arrays
    function SetLegends($aLegend) {
	$this->legends = $aLegend;
    }

    // Set text labels for slices 
    function SetLabels($aLabels,$aLblPosAdj="auto") {
	$this->labels = array_reverse($aLabels);
	$this->ilabelposadj=$aLblPosAdj;
    }

    function SetLabelPos($aLblPosAdj) {
	$this->ilabelposadj=$aLblPosAdj;
    }
	
    // Should we display actual value or percentage?
    function SetLabelType($t) {
	if( $t<0 || $t>1 ) 
	    JpGraphError::Raise("PiePlot::SetLabelType() Type for pie plots must be 0 or 1 (not $t).");
	$this->labeltype=$t;
    }

    function SetValueType($aType) {
	$this->SetLabelType($aType);
    }


    // Should the circle around a pie plot be displayed
    function ShowBorder($exterior=true,$interior=true) {
	$this->pie_border = $exterior;
	$this->pie_interior_border = $interior;
    }
	
    // Setup the legends
    function Legend(&$graph) {
	$colors = array_keys($graph->img->rgb->rgb_table);
   	sort($colors);	
   	$ta=$this->themearr[$this->theme];	
   	$n = count($this->data);

   	if( $this->setslicecolors==null ) 
	    $numcolors=count($ta);
   	else {
	    $this->setslicecolors = array_slice($this->setslicecolors,0,$n);
	    $numcolors=$n; 
	    if( $graph->pieaa && get_class($this)==='pieplot' ) { 
		$this->setslicecolors = array_reverse($this->setslicecolors);
	    }
	}
		
	$sum=0;
	for($i=0; $i < $n; ++$i)
	    $sum += $this->data[$i];

	// Bail out with error if the sum is 0
	if( $sum==0 )
	    JpGraphError::Raise("Illegal pie plot. Sum of all data is zero for Pie!");

	// Make sure we don't plot more values than data points
	// (in case the user added more legends than data points)
	$n = min(count($this->legends),count($this->data));
	if( $this->legends != "" )
	    $this->legends = array_reverse($this->legends);
	for( $i=$n-1; $i >= 0; --$i ) {
	    $l = $this->legends[$i];
	    // Replace possible format with actual values
	    if( $this->labeltype==0 ) {
		$l = sprintf($l,100*$this->data[$i]/$sum);
	    }
	    else {
		$l = sprintf($l,$this->data[$i]);
	    }
	    
	    $alt = sprintf($this->csimalts[$i],$this->data[$i]);
				
	    if( $this->setslicecolors==null ) 
		$graph->legend->Add($l,$colors[$ta[$i%$numcolors]],"",0,
				    $this->csimtargets[$i],$alt);
	    else
		$graph->legend->Add($l,$this->setslicecolors[$i%$numcolors],"",0,
				    $this->csimtargets[$i],$alt);
	}
    }
	
    function Stroke(&$img,$aaoption=0) {
	// aaoption is used to handle antialias
	// aaoption == 0 a normal pie
	// aaoption == 1 just the body
	// aaoption == 2 just the values

	// Explode scaling. If anti anti alias we scale the image
	// twice and we also need to scale the exploding distance
	$expscale = $aaoption === 1 ? 2 : 1;

	$colors = array_keys($img->rgb->rgb_table);
   	sort($colors);	
   	$ta=$this->themearr[$this->theme];	
	$n = count($this->data);
   	
   	if( $this->setslicecolors==null ) 
	    $numcolors=count($ta);
   	else {
	    $this->setslicecolors = array_reverse(array_slice($this->setslicecolors,0,$n));
	    $numcolors=$n; 
	}
   	
	// Draw the slices
	$sum=0;
	for($i=0; $i < $n; ++$i)
	    $sum += $this->data[$i];
	
	// Bail out with error if the sum is 0
	if( $sum==0 )
	    JpGraphError::Raise("Sum of all data is 0 for Pie.");
	
	// Set up the pie-circle
	if( $this->radius <= 1 )
	    $radius = floor($this->radius*min($img->width,$img->height));
	else {
	    $radius = $aaoption === 1 ? $this->radius*2 : $this->radius;
	}

	if( $this->posx <= 1 && $this->posx > 0 )
	    $xc = round($this->posx*$img->width);
	else
	    $xc = $this->posx ;
	
	if( $this->posy <= 1 && $this->posy > 0 )
	    $yc = round($this->posy*$img->height);
	else
	    $yc = $this->posy ;
		
	$this->startangle = $this->startangle*M_PI/180;

	$n = count($this->data);

	if( $this->explode_all )
	    for($i=0; $i < $n; ++$i)
		$this->explode_radius[$i]=$this->explode_r;


	if( $this->ishadowcolor != "" && $aaoption !== 2) {
	    $accsum=0;
	    $angle2 = $this->startangle;
	    $img->SetColor($this->ishadowcolor);
	    for($i=0; $sum>0 && $i < $n; ++$i) {
		$d = $this->data[$i];
		$angle1 = $angle2;
		$accsum += $d;
		$angle2 = $this->startangle+2*M_PI*$accsum/$sum;
		if( empty($this->explode_radius[$i]) )
		    $this->explode_radius[$i]=0;

		$la = 2*M_PI - (abs($angle2-$angle1)/2.0+$angle1);
		$xcm = $xc + $this->explode_radius[$i]*cos($la)*$expscale;
		$ycm = $yc - $this->explode_radius[$i]*sin($la)*$expscale;
		
		$xcm += $this->ishadowdrop*$expscale;
		$ycm += $this->ishadowdrop*$expscale;

		$img->CakeSlice($xcm,$ycm,$radius,$radius,
				$angle1*180/M_PI,$angle2*180/M_PI,$this->ishadowcolor);
		
	    }
	}

	$accsum=0;
	$angle2 = $this->startangle;
	$img->SetColor($this->color);
	for($i=0; $sum>0 && $i < $n; ++$i) {
	    $d = $this->data[$i];
	    $angle1 = $angle2;
	    $accsum += $d;
	    $angle2 = $this->startangle+2*M_PI*$accsum/$sum;

	    if( $this->setslicecolors==null )
		$slicecolor=$colors[$ta[$i%$numcolors]];
	    else
		$slicecolor=$this->setslicecolors[$i%$numcolors];

	    if( $this->pie_interior_border && $aaoption===0 )
		$img->SetColor($this->color);
	    else
		$img->SetColor($slicecolor);

	    $arccolor = $this->pie_border && $aaoption===0 ? $this->color : "";

	    $this->la[$i] = 2*M_PI - (abs($angle2-$angle1)/2.0+$angle1);

	    if( empty($this->explode_radius[$i]) )
		$this->explode_radius[$i]=0;

	    $xcm = $xc + $this->explode_radius[$i]*cos($this->la[$i])*$expscale;
	    $ycm = $yc - $this->explode_radius[$i]*sin($this->la[$i])*$expscale;

	    if( $aaoption !== 2 ) {
		$img->CakeSlice($xcm,$ycm,$radius-1,$radius-1,
				$angle1*180/M_PI,$angle2*180/M_PI,$slicecolor,$arccolor);
	    }

	    if ($this->csimtargets && $aaoption !== 1 ) 
		$this->AddSliceToCSIM($i,$xcm,$ycm,$radius,$angle1,$angle2);

	}

	if( $this->value->show && $aaoption !== 1 ) {
	    // Format the titles for each slice
	    for( $i=0; $i < $n; ++$i) {
		if( $this->labeltype==0 )
		    if( $sum != 0 )
			$l = 100.0*$this->data[$i]/$sum;
		    else
			$l = 0.0;
		else
		    $l = $this->data[$i]*1.0;
		if( isset($this->labels[$i]) && is_string($this->labels[$i]) )
		    $this->labels[$i]=sprintf($this->labels[$i],$l);
		else
		    $this->labels[$i]=$l;
	    }

	    $this->StrokeAllLabels($img,$xc,$yc,$radius);
	}

	// Adjust title position
	if( $aaoption !== 1 ) {
	    $this->title->Pos($xc,
			  $yc-$this->title->GetFontHeight($img)-$radius-$this->title->margin,
			  "center","bottom");
	    $this->title->Stroke($img);
	}

    }

//---------------
// PRIVATE METHODS	

    function StrokeAllLabels($img,$xc,$yc,$radius) {
	$n = count($this->labels);
	for($i=0; $i < $n; ++$i) {
	    $this->StrokeLabel($this->labels[$i],$img,$xc,$yc,$this->la[$i],
			       $radius + $this->explode_radius[$i]); 
	}
    }

    // Position the labels of each slice
    function StrokeLabel($label,$img,$xc,$yc,$a,$r) {

	// Default value