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micha _a.t_ psytrance _d.o.t_ info ¶
20 years ago
for nice colors and adapted shadows from amount of values i try:

<?php
function _errechne_gradzahlen( $werte ) {         /* calc degrees */    
    foreach( $werte as $wert ) { $sum += $wert; }
    foreach( $werte as $wert ) { $gradzahlen[] = 360 * ( $wert / $sum ); }
    return $gradzahlen;
}

function _randomcol ( $im ) {
    return imagecolorallocate( $im, rand(100, 224), rand(100, 224), rand(128, 224) );        
}

$values = array( 100, 200, 50, 100, 43, 32 );    /* the data to display ( real values ) */
$werte = _errechne_gradzahlen( $values );        /* degrees-array */
$width = 200;
$height = 200;
$half_width = floor( $width / 2 );
$half_height = floor($height / 2);

$im = ImageCreateTrueColor( $width, $height );

foreach( $werte as $key => $wert ) {
    /* get colors and shadows */
    $color = _randomcol( $im );                 
    $shadow = $color - 20000;                 // or brighter shadows take 10000
    $colors[] = $color;
    $shadows[] = $shadow;
/* 3D effekt */
     for ($i = ($half_height + 10); $i > $half_height; $i--) {
        imagefilledarc( 
                    $im, 
                    $half_width,  $i,         
                    $width, $half_height,
                    $offset, ($offset + $wert),   // from, to (degrees)
                    $shadows[$key], IMG_ARC_NOFILL);
    }
    $offset = $offset + $wert;
}
$offset = 0;

foreach( $werte as $key => $wert ) {             /* an now draw the top */
    imagefilledarc( 
                $im, 
                $half_width, $half_width, 
                $width, $half_height,           // half sized
                $offset, ($offset + $wert), 
                $colors[$key], IMG_ARC_PIE);
    $offset = $offset + $wert;
}
header( "Content-type: image/png" );
imagepng ( $im );
imagedestroy( $im );
?>

sry for my crab english and the disordered code, i cut and 'translate' it from a class i wrote before.
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