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14 years ago
A simple pie chart generation script. 

Displays the percentage at center arc and displays the Legends with random colors. 



<?php

class simplepie

{

    function __construct($width, $height, $dataArr)

    {

        $font = './verdana.ttf'; /** get it from c:/windows/fonts dir */

        $this->image = imagecreate($width,$height);

        $piewidth = $width * 0.70;/* pie area */

        $x = round($piewidth/2);

        $y = round($height/2);

        $total = array_sum($dataArr);

        $angle_start = 0;

        $ylegend = 2;

        imagefilledrectangle($this->image, 0, 0, $width, $piewidth, imagecolorallocate($this->image, 128, 128, 128));

        foreach($dataArr as $label=>$value) {

            $angle_done    = ($value/$total) * 360; /** angle calculated for 360 degrees */

            $perc          = round(($value/$total) * 100, 1); /** percentage calculated */

            $color         = imagecolorallocate($this->image, rand(0, 255), rand(0, 255), rand(0, 255));

            imagefilledarc($this->image, $x, $y, $piewidth, $height, $angle_start, $angle_done+= $angle_start, $color, IMG_ARC_PIE);

            $xtext = $x + (cos(deg2rad(($angle_start+$angle_done)/2))*($piewidth/4));

            $ytext = $y + (sin(deg2rad(($angle_start+$angle_done)/2))*($height/4)); 

            imagettftext($this->image, 6, 0, $xtext, $ytext, imagecolorallocate($this->image, 0, 0, 0), $font, "$perc %");

            imagefilledrectangle($this->image, $piewidth+2, $ylegend, $piewidth+20, $ylegend+=20, $color); 

            imagettftext($this->image, 8, 0, $piewidth+22, $ylegend, imagecolorallocate($this->image, 0, 0, 0), $font, $label);

            $ylegend += 4;

            $angle_start = $angle_done;

        }

    }

    function render()

    {

        header('Content-type: image/png');

        imagepng($this->image);

    }

}

/** usage */

$dataArr = array(2001=>10, 2002=>30, 2003=>50, 2004=>10);

$width=600;

$height=480;

$pie = new simplepie($width, $height, $dataArr);

$pie->render();

?>
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