imagefilledarc()

(PHP 4 >= 4.0.6, PHP 5, PHP 7)

画一椭圆弧且填充

说明

imagefilledarc(resource $image,int $cx,int $cy,int $width,int $height,int $start,int $end,int $color,int $style): bool

在指定的$image上画一椭圆弧且填充。

参数

$image

由图象创建函数(例如imagecreatetruecolor())返回的图象资源。

$cx

中间的 x 坐标。

$cy

中间的 y 坐标。

$width

椭圆弧的宽度。

$height

椭圆弧的高度。

$start

起点角度。

$end

终点角度。 0° is located at the three-o'clock position, and the arc is drawn clockwise.

$color

imagecolorallocate()创建的颜色标识符。

$style

值可以是下列值的按位或（OR）：

1. IMG_ARC_PIE
2. IMG_ARC_CHORD
3. IMG_ARC_NOFILL
4. IMG_ARC_EDGED

IMG_ARC_PIE和IMG_ARC_CHORD是互斥的；IMG_ARC_CHORD只是用直线连接了起始和结束点，IMG_ARC_PIE则产生圆形边界。IMG_ARC_NOFILL指明弧或弦只有轮廓，不填充。IMG_ARC_EDGED指明用直线将起始和结束点与中心点相连，和IMG_ARC_NOFILL一起使用是画饼状图轮廓的好方法（而不用填充）。

返回值

成功时返回TRUE，或者在失败时返回FALSE。

范例

创建一 3D 效果的饼状图

<?php
// 创建图像
$image = imagecreatetruecolor(100, 100);
// 分配一些颜色
$white    = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
$gray     = imagecolorallocate($image, 0xC0, 0xC0, 0xC0);
$darkgray = imagecolorallocate($image, 0x90, 0x90, 0x90);
$navy     = imagecolorallocate($image, 0x00, 0x00, 0x80);
$darknavy = imagecolorallocate($image, 0x00, 0x00, 0x50);
$red      = imagecolorallocate($image, 0xFF, 0x00, 0x00);
$darkred  = imagecolorallocate($image, 0x90, 0x00, 0x00);
// 创建 3D 效果
for ($i = 60; $i > 50; $i--) {
   imagefilledarc($image, 50, $i, 100, 50, 0, 45, $darknavy, IMG_ARC_PIE);
   imagefilledarc($image, 50, $i, 100, 50, 45, 75 , $darkgray, IMG_ARC_PIE);
   imagefilledarc($image, 50, $i, 100, 50, 75, 360 , $darkred, IMG_ARC_PIE);
}
imagefilledarc($image, 50, 50, 100, 50, 0, 45, $navy, IMG_ARC_PIE);
imagefilledarc($image, 50, 50, 100, 50, 45, 75 , $gray, IMG_ARC_PIE);
imagefilledarc($image, 50, 50, 100, 50, 75, 360 , $red, IMG_ARC_PIE);
// 输出图像
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>

以上例程的输出类似于：

注释

Note:此函数需要 GD 2.0.1 或更高版本(推荐 2.0.28 及更高版本)。

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();
?>

The analogue of the function
<?php
function myimagefilledarc($image, $cx, $cy, $width, $height, $start, $end, $color, $style = IMG_ARC_PIE){ 
 
  $delta = 0.1;
  $twoPi = 2*pi();
  
  $w = $width/2;
  $h = $height/2;
  
  if($h<=$w){
    $kx=$w;
    $ky=$w*$h/$w;
  }else{
    $kx=$h*$w/$h;
    $ky=$h;
  }
  
  $StartRad = deg2rad($start);
  $EndRad  = deg2rad($end);
    
  $array_points[] = $cx;
  $array_points[] = $cy;
  
  $a = $StartRad;
  if($style==IMG_ARC_PIE 
   or $style==IMG_ARC_EDGED 
   or $style==(IMG_ARC_PIE|IMG_ARC_NOFILL) 
   or $style==(IMG_ARC_EDGED|IMG_ARC_NOFILL)){
    
    if($StartRad>=$EndRad){
      
      $b[] = $twoPi;
      $b[] = $EndRad;
      
    }else $b[] = $EndRad;
      
  }else $b[] = 0;
   
  foreach($b as $vb){
    do {  
      $array_points[] = $cx + $kx*cos($a);
      $array_points[] = $cy + $ky*sin($a);
      $a += $delta; 
    } while ($a<$vb);
    $a = 0;
  }
  
  $array_points[] = $cx + $kx*cos($EndRad);
  $array_points[] = $cy + $ky*sin($EndRad);
  
  $count_array_points  = count($array_points);
  $num_points = $count_array_points/2;
  
  if($style==IMG_ARC_PIE or $style==IMG_ARC_EDGED or $style==IMG_ARC_CHORD){
    imagefilledpolygon($image, $array_points, $num_points, $color);
  }elseif($style==(IMG_ARC_PIE|IMG_ARC_NOFILL)){
    
    $i = 1; 
    $c = $count_array_points - 1;
    
    $x1 = $array_points[++$i];
    $y1 = $array_points[++$i];
    
    do { 
      $x2 = $array_points[++$i]; 
      $y2 = $array_points[++$i];
      imageline($image, $x1, $y1, $x2, $y2, $color);
      $x1 = $x2; 
      $y1 = $y2; 
    } while ($i<$c);
      
  }elseif($style==(IMG_ARC_CHORD|IMG_ARC_NOFILL) or $style==(IMG_ARC_PIE|IMG_ARC_NOFILL)){
    imageline($image, $array_points[2], $array_points[3], $array_points[4], $array_points[5], $color);
  }else{  
    imagepolygon($image, $array_points, $num_points, $color);  
  }
  
}
$image = imagecreatetruecolor(900, 1250);
$white    = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
$gray[]   = imagecolorallocate($image, 0xC0, 0xC0, 0xC0);
$gray[]   = imagecolorallocate($image, 0x90, 0x90, 0x90);
$navy[]   = imagecolorallocate($image, 0x00, 0x00, 0x80);
$navy[]   = imagecolorallocate($image, 0x00, 0x00, 0x50);
$red[]   = imagecolorallocate($image, 0xFF, 0x00, 0x00);
$red[]   = imagecolorallocate($image, 0x90, 0x00, 0x00);
$yellow[]  = imagecolorallocate($image, 0xFF, 0xFF, 0x00);
$yellow[]  = imagecolorallocate($image, 0x90, 0x90, 0x00);
$Cx = 200;
$Cy = 100;
$W = 300;
$H = 100;
$Dx = 500;
$Dy = 0;
$Dy_3d = 40;
$Angles['yellow']  = array(180,0);
$Angles['gray']    = array(0,88);
$Angles['navy']    = array(88,92);
$Angles['red']    = array(92,180);
$styles['IMG_ARC_PIE'] = IMG_ARC_PIE; 
$styles['IMG_ARC_CHORD'] = IMG_ARC_CHORD;
$styles['IMG_ARC_PIE|IMG_ARC_NOFILL'] = IMG_ARC_PIE|IMG_ARC_NOFILL;
$styles['IMG_ARC_CHORD|IMG_ARC_NOFILL'] = IMG_ARC_CHORD|IMG_ARC_NOFILL;
$styles['IMG_ARC_PIE|IMG_ARC_EDGED|IMG_ARC_NOFILL'] = IMG_ARC_PIE|IMG_ARC_EDGED|IMG_ARC_NOFILL;
$styles['IMG_ARC_CHORD|IMG_ARC_EDGED|IMG_ARC_NOFILL'] = IMG_ARC_CHORD|IMG_ARC_EDGED|IMG_ARC_NOFILL;
imagestring($image, 5, 130, 15, 'imagefilledarc', $white);
imagestring($image, 5, 130 + $Dx, 15, 'myimagefilledarc', $white);
foreach($styles as $name_style => $style){
  
  for ($i = $Cy+$Dy_3d; $i > $Cy; $i--) {
    foreach($Angles as $colors=>$angle){
      imagefilledarc($image, $Cx, $i+$Dy, $W, $H, $angle[0], $angle[1],$$colors[1], $style);
    }
  }
      
  foreach($Angles as $colors=>$angle){
    imagefilledarc($image, $Cx, $Cy+$Dy, $W, $H, $angle[0], $angle[1],$$colors[0], $style);
  }
  
  
  for ($i = $Cy+$Dy_3d; $i > $Cy; $i--) {
    foreach($Angles as $colors=>$angle){
      myimagefilledarc($image, $Cx+$Dx, $i+$Dy, $W, $H, $angle[0], $angle[1],$$colors[1], $style);
    }
  }
      
  foreach($Angles as $colors=>$angle){
    myimagefilledarc($image, $Cx+$Dx, $Cy+$Dy, $W, $H, $angle[0], $angle[1],$$colors[0], $style);
  }
  
  imagestring($image, 5, 450-strlen($name_style)*8/2, $Cy+$Dy+$H-10, $name_style, $yellow[0]);
  $Dy+=200;
}
 
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>

The previous example does not work well. This is much better and faster:
<?php
$Randomized = rand(1,20);
for($i=0;$i<=$Randomized;$i++){$data[$i]=rand(2,20);};//full array with garbage.
$imgx='600';$imgy='400';//Set Image Size. ImageX,ImageY
$cx = '300';$cy ='150'; //Set Pie Postition. CenterX,CenterY
$sx = '600';$sy='300';$sz ='100';// Set Size-dimensions. SizeX,SizeY,SizeZ
$data_sum = array_sum($data);
//convert to angles.
for($i=0;$i<=$Randomized;$i++){
  $angle[$i] = (($data[$i] / $data_sum) * 360);
  $angle_sum[$i] = array_sum($angle);
};
$im = imagecreate ($imgx,$imgy);
$background = imagecolorallocate($im, 255, 255, 255);
//Random colors.
for($i=0;$i<=$Randomized;$i++){
  $r=rand(100,255);$g=rand(100,255);$b=rand(100,255);  
  $colors[$i] = imagecolorallocate($im,$r,$g,$b);
  $colord[$i] = imagecolorallocate($im,($r/1.5),($g/1.5),($b/1.5));
}
//3D effect.
for($z=1;$z<=$sz;$z++){
    // first slice
  imagefilledarc($im,$cx,($cy+$sz)-$z,$sx,$sy,0
  ,$angle_sum[0],$colord[0],IMG_ARC_EDGED);
  for($i=1;$i<=$Randomized;$i++){
    imagefilledarc($im,$cx,($cy+$sz)-$z,$sx,$sy,$angle_sum[$i-1]
    ,$angle_sum[$i],$colord[$i],IMG_ARC_NOFILL);
  };
};
//Top pie.
  // first slice
  imagefilledarc($im,$cx,$cy,$sx,$sy,0 ,$angle_sum[0], $colors[0], IMG_ARC_PIE);
for($i=1;$i<=$Randomized;$i++){
  imagefilledarc($im,$cx,$cy,$sx,$sy,$angle_sum[$i-1] ,$angle_sum[$i], $colors[$i], IMG_ARC_PIE);
};
//Output.
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>

For everyone who will use imageellipse() with a border (imagesetthickness() not working correctly).
This function simualtes the standard gd border.
<?php
function imageEllipseWithBorder($image, $centerX, $centerY, $width, $height, $color, $borderWidth)
  {
    // Calculate inner and outer strength of border
    $borderOuterStrength = (($borderWidth - 1) / 2);
    $borderInnerStrength = ((($borderWidth - 1) / 2) + 1);
    // Caculate x-/y-offset from 0/0 position to ellipse center
    $ellipseXOffset = $centerX - ($width / 2) - $borderOuterStrength;
    $ellipseYOffset = $centerY - ($height / 2) - $borderOuterStrength;
    // Create temp image for editing
    $tempImageWidth = $width + ($borderOuterStrength * 2) + 1;
    $tempImageHeight = $height + ($borderInnerStrength * 2) + 1;
    $tempImage = imagecreatetruecolor($tempImageWidth, $tempImageHeight);
    imagealphablending($tempImage, false);
    // Fill temp image with "transparent" color
    $transparent = imagecolorallocatealpha($tempImage, 255, 255, 255, 127);
    imagefill($tempImage, 0, 0, $transparent);
    // Draw outer ellipse (representing the border)
    imagefilledellipse(
      $tempImage,
      $centerX - $ellipseXOffset,
      $centerY - $ellipseYOffset,
      $width + $borderOuterStrength * 2,
      $height + $borderOuterStrength * 2,
      $color
    );
    // Draw inner ellipse (transparent area)
    imagefilledellipse(
      $tempImage,
      $centerX - $ellipseXOffset,
      $centerY - $ellipseYOffset,
      $width - $borderInnerStrength * 2,
      $height - $borderInnerStrength * 2,
      $transparent
    );
    // "Paste" ellipse (with transparent inner area) into image at original position
    imagealphablending($image, true);
    imagecopy(
      $image,
      $tempImage,
      $ellipseXOffset + ($borderWidth + 1) % 2,
      $ellipseYOffset + ($borderWidth + 1) % 2,
      0,
      0,
      $tempImageWidth,
      $tempImageHeight
    );
  }
?>

If you want to make a pie graph with exploded slices and data shows on each one and data side right too you can use this snippet.
<?php
$values = array("2010" => 1950, "2011" => 750, "2012" => 2100, "2013" => 580, "2014" => 5000);
$total = count($values);
$data = ($total == 0) ? array(360) : array_values($values);
$keys = ($total == 0) ? array("") : array_keys($values);
$radius = 30;
$imgx = 1800 + $radius;
$imgy = 600 + $radius;
$cx = 400 + $radius;
$cy = 200 + $radius;
$sx = 800;
$sy = 400;
$sz = 150;
$data_sum = array_sum($data);
$angle_sum = array(-1 => 0, 360);
$typo = "./helvetica.ttf";
$im = imagecreate($imgx, $imgy);
imagecolorallocate($im, 255, 255, 255);
$color = array(
  array(220, 20, 60),
  array(77, 33, 114),
  array(249, 141, 53),
  array(158, 37, 59),
  array(1, 128, 128),
  array(28, 94, 160),
  //array(206, 16, 118),
  array(43, 67, 86),
  //array(155, 108, 166),
  array(83, 69, 62)
);
shuffle($color);
shuffle($color);
shuffle($color);
$colors = array(imagecolorallocate($im, $color[0][0], $color[0][1], $color[0][2]));
$colord = array(imagecolorallocate($im, ($color[0][0] / 1.5), ($color[0][1] / 1.5), ($color[0][2] / 1.5)));
$factorx = array();
$factory = array();
for($i = 0; $i < $total; $i++){
  $angle[$i] = (($data[$i] / $data_sum) * 360);
  $angle_sum[$i] = array_sum($angle);
  $colors[$i] = imagecolorallocate($im, $color[$i][0], $color[$i][1], $color[$i][2]);
  $colord[$i] = imagecolorallocate($im, ($color[$i][0] / 1.5), ($color[$i][1] / 1.5), ($color[$i][2] / 1.5));
  $factorx[$i] = cos(deg2rad(($angle_sum[$i - 1] + $angle_sum[$i]) / 2));
  $factory[$i] = sin(deg2rad(($angle_sum[$i - 1] + $angle_sum[$i]) / 2));
}
for($z = 1; $z <= $sz; $z++){
  for($i = 0; $i < $total; $i++){
    imagefilledarc($im, $cx + ($factorx[$i] * $radius), (($cy + $sz) - $z) + ($factory[$i] * $radius), $sx, $sy, $angle_sum[$i - 1], $angle_sum[$i], $colord[$i], IMG_ARC_PIE);
  }
}
for($i = 0; $i < $total; $i++){
  imagefilledarc($im, $cx + ($factorx[$i] * $radius), $cy + ($factory[$i] * $radius), $sx, $sy, $angle_sum[$i - 1], $angle_sum[$i], $colors[$i], IMG_ARC_PIE);
  imagefilledrectangle($im, 900, 50 + ($i * 50 * 2), 950, 100 + ($i * 50 * 2), $colors[$i]);
  imagettftext($im, 50, 0, 970, 100 + ($i * 50 * 2), imagecolorallocate($im, 0, 0, 0), $typo, $keys[$i]);
  imagettftext($im, 40, 0, $cx + ($factorx[$i] * ($sx / 4)) - 40, $cy + ($factory[$i] * ($sy / 4)) + 10, imagecolorallocate($im, 0, 0, 0), $typo, $data[$i]);
}
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>

If this function is not available because you're using an old gdlib version, here is a workaround if you want to draw a pie chart:
<?php
// width and height of the image
$width=200;
$height=200;
$simulate_old_gd=true; // do not use imagefilledarc although available? 
// the pieces of the pie (in degree)
$pieces=array(180,90,45,25,15,5);
$diagram=imagecreate($width,$height);
// background color
$white=imagecolorallocate($diagram, 255, 255, 255);
imagefilledrectangle($diagram,0,0,$width,$height,$white);
// the circle is 2px smaller than the image
$width-=2;
$height-=2;
// we need a border color
$black=imagecolorallocate($diagram, 0, 0, 0);
// draw the border of the pie
imagearc($diagram, round($width/2), round($height/2), 
     $width, $height, 0, 360, $black);
// position (in degrees) where to place the next piece
$position=270; 
// we will use calculated gray colors for simple example
$gray=0; 
foreach($pieces as $deg)
 {
 // calculate the gray color
 $gray+=30;
 if($gray>255) $gray=0;
 $color=imagecolorallocate($diagram,$gray,$gray,$gray);
 
 // position must be kept < 360
 if($position>360) $position-=360;
 if(!$simulate_old_gd && is_callable('imagefilledarc'))
 { 
 imagefilledarc($diagram, round($width/2), 
 round($height/2), $width, $height, $position, 
 $position+$deg, $color,IMG_ARC_EDGED);
 }
 else
 {
 // we use some maths to calculate the pixel on the circle
 $pix_x=round(floor(($width-2)/2)*cos($position/180*M_PI)
     +round($width/2));
 $pix_y=round(floor(($height-2)/2)*sin($position/180*M_PI)
     +round($height/2));
 // now we draw a line from the mid of the circle to the
 // calculated pixel on the circle
 imageline($diagram, round($width/2), round($height/2), 
      $pix_x, $pix_y, $black);
 // now we need a pixel for flood filling.
 //- We could use maths to calculate a pixel inside the 
 // piece:
 //$fill_x=round(floor(($width-10)/2)*
 //    cos(($position+2)/180*M_PI)+round($width/2));
 //$fill_y=round(floor(($height-10)/2)*
 //    sin(($position+2)/180*M_PI)+round($height/2));
 //- or we could use an universal pixel with less maths ;) 
 // (top mid):
 $fill_x=floor($width/2)-2;
 $fill_y=3;
 // now we flood fill the circle
 @imagefilltoborder ($diagram,$fill_x,$fill_y,$black,$color);
 /* (it does not matter here that we fill more than we need
   because the next pieces will fix this)
   IF YOU ONLY WANT ONE PIECE
   (simulate imagefilledarc) you'd have to draw
   both border lines and flood fill afterwards */
 }
 // the position of the next piece is $deg degrees further
 $position+=$deg;
 }
 
// output the image
header('Content-type: image/png');
imagepng($diagram);
imagedestroy($digram);
?>

The code below uses colors from "hans at lintoo dot dk"'s note. It delivers pie charts with labels:
<?php
$bright_list = array(
  array(255, 203, 3),
  array(220, 101, 29),
  array(189, 24, 51),
  array(214, 0, 127),
  array(98, 1, 96),
  array(0, 62, 136),
  array(0, 102, 179),
  array(0, 145, 195),
  array(0, 115, 106),
  array(178, 210, 52),
  array(137, 91, 74),
  array(82, 56, 47)
);
$dark_list = array(
  array(205, 153, 0),
  array(170, 51, 0),
  array(139, 0, 1),
  array(164, 0, 77),
  array(48, 0, 46),
  array(0, 12, 86),
  array(0, 52, 129),
  array(0, 95, 145),
  array(0, 65, 56),
  array(128, 160, 2),
  array(87, 41, 24),
  array(32, 6, 0)
);
$data = array();
$angle = array();
$title = array();
$i = 0;
foreach( $_GET as $key => $value ) {
  $data[$i] = intval($value);
  $title[$i++] = str_replace("_"," ",strval($key));
}
$sum = array_sum($data);
if( $sum == 0 ) {
  ++ $sum;
}
$count = count($data);
for( $i = 0; $i < $count; ++ $i ) {
  $angle[$i] = floor($data[$i]/$sum*360);
  if( $angle[$i] == 0 ) {
    ++ $angle[$i];
  }
}
$sum_angle = array_sum($angle);
if( $sum_angle < 360 ) {
  $angle[0]+=360-$sum_angle;
}
$height = $count*34;
if( $height < 180 ) {
  $height = 180;
}
$im = imagecreate (350, $height);
$background = imagecolorallocate($im, 226, 226, 226);
$border = imagecolorallocate($im,97,97,97);
$font_color = imagecolorallocate($im,0,0,0);
$font = 'yourfont.ttf';
$bright = array();
foreach( $bright_list as $c ) {
  $bright[] = imagecolorallocate($im,$c[0],$c[1],$c[2]);
}
$dark = array();
foreach( $dark_list as $c ) {
  $dark[] = imagecolorallocate($im,$c[0],$c[1],$c[2]);
}
$tmp = 0;
for( $i =0; $i < $count; ++ $i ) {
  for( $j = 100; $j > 90; -- $j ) {
    imagefilledarc($im, 100, $j, 180, 120, $tmp, $tmp+$angle[$i], $dark[$i], IMG_ARC_PIE);
  }
  $tmp += $angle[$i];
}
$tmp = 0;
for( $i =0; $i < $count; ++ $i ) {
  imagefilledarc($im, 100, 90, 180, 120, $tmp, $tmp+$angle[$i], $bright[$i], IMG_ARC_PIE);
  $tmp += $angle[$i];
}
for( $i = 0; $i < $count; ++ $i ) {
  imagefilledrectangle($im, 209, 19+($i*30), 231, 41+($i*30), $border);
  imagefilledrectangle($im, 210, 20+($i*30), 230, 40+($i*30), $bright[$i]);
  imagefttext($im, 11, 0, 240, 34+($i*30), $font_color, $font, $title[$i]);
}
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>
try 'pie.php?foo=3&bar=4&baz=6'

The previous example does not work. Try those modifications and you will have the expected results :
<?
$Randomized = rand(1,20);
for($i=0;$i<=$Randomized;$i++){$data[$i]=rand(2,20);};//full array with garbage.
$imgx='200';$imgy='200';//Set Image Size. ImageX,ImageY
$cx = '100';$cy ='50'; //Set Pie Postition. CenterX,CenterY
$sx = '200';$sy='100';$sz ='20';// Set Size-dimensions. SizeX,SizeY,SizeZ
$data_sum = array_sum($data);
//convert to angles.
for($i=0;$i<=$Randomized;$i++){
  $angle[$i] = (($data[$i] / $data_sum) * 360);
  $angle_sum[$i] = array_sum($angle);
};
$im = imagecreate ($imgx,$imgy);
$background = imagecolorallocate($im, 255, 255, 255);
//Random colors.
for($i=0;$i<=$Randomized;$i++){
  $r=rand(100,255);$g=rand(100,255);$b=rand(100,255);  
  $colors[$i] = imagecolorallocate($im,$r,$g,$b);
  $colord[$i] = imagecolorallocate($im,($r/2),($g/2),($b/2));
}
//3D effect.
for($z=1;$z<=$sz;$z++){
  for($i=1;$i<=$Randomized;$i++){
imagefilledarc($im,$cx,($cy+$sz)-$z,$sx,$sy,$angle_sum[$i-1]
,$angle_sum[$i],$colord[$i],IMG_ARC_PIE);
  };
};
//Top pie.
for($i=1;$i<=$Randomized;$i++){
  imagefilledarc($im,$cx,$cy,$sx,$sy,$angle_sum[$i-1] ,$angle_sum[$i], $colors[$i], IMG_ARC_PIE);
};
//Output.
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>

Here's a slightly better way to get the colours for the pie chart shaded wall as posted by double-zonk at wp dot pl
<?php
$rgb0 = array (255, 153, 204); 
$rgb1 = array (255, 153, 0); 
$rgb2 = array (153, 204, 0); 
$rgb3 = array (51, 153, 102); 
$rgb4 = array (51, 204, 204); 
$rgb5 = array (51, 102, 255); 
$rgb6 = array (128, 0, 128); 
$rgb7 = array (150, 150, 150); 
for ($r = 0; $r < 8; ++$r)
  { 
    if(${"rgb" . $r}[0] < 50) $shadowr = 0; else $shadowr = ${"rgb" . $r}[0] - 50; 
    if(${"rgb" . $r}[1] < 50) $shadowg = 0; else $shadowg = ${"rgb" . $r}[1] - 50; 
    if(${"rgb" . $r}[2] < 50) $shadowb = 0; else $shadowb = ${"rgb" . $r}[2] - 50; 
    ${"wall" . $r} = array ($shadowr, $shadowg, $shadowb); 
  } 
for ($s = 0; $s < 8; ++$s)
  { 
    $kolor[$s] = imagecolorallocate($image, ${"rgb" . $s}[0], ${"rgb" . $s}[1], ${"rgb" . $s}[2]); 
    $cien[$s] = imagecolorallocate($image, ${"wall" . $s}[0], ${"wall" . $s}[1], ${"wall" . $s}[2]); 
  } 
?>

Note that imageFilledArc() and imageArc() both take ints as degree measurements. This is no problem if you're *only* using imageArc() and/or imageFilledArc(). However, if you're using calculated degrees and plan to superimpose other drawing elements (eg., you want to make vertical lines between the shadow 3D effect) you need to floor() your degrees before converting them to radians, otherwise you'll get precision errors.
A small example illustrating the 'feature'...
<?php
$img = imageCreate(400, 400);
$back = imageColorAllocate($img, 0, 0, 0);
$front = imageColorAllocate($img, 255, 255, 255);
$sd = 45.5;
$ed = 130.5;
imageFilledArc($img, 200, 200, 300, 300, $sd, $ed,
        $front, IMG_ARC_PIE|IMG_ARC_NOFILL|IMG_ARC_EDGED);
imageArc($img, 200, 230, 300, 300, $sd, $ed, $front);
imageLine($img,
     cos(deg2rad($sd))*150+200, sin(deg2rad($sd))*150+200,
     cos(deg2rad($sd))*150+200, sin(deg2rad($sd))*150+230,
     $front);
imageLine($img,
     cos(deg2rad($ed))*150+200, sin(deg2rad($ed))*150+200,
     cos(deg2rad($ed))*150+200, sin(deg2rad($ed))*150+230,
     $front);
header('Content-type: image/png');
imagepng($img);
imagedestroy($img);
?>
And this is how it should be...
<?php
$img = imageCreate(400, 400);
$back = imageColorAllocate($img, 0, 0, 0);
$front = imageColorAllocate($img, 255, 255, 255);
$sd = floor(45.5);
$ed = floor(130.5);
imageFilledArc($img, 200, 200, 300, 300, $sd, $ed,
        $front, IMG_ARC_PIE|IMG_ARC_NOFILL|IMG_ARC_EDGED);
imageArc($img, 200, 230, 300, 300, $sd, $ed, $front);
imageLine($img,
     cos(deg2rad($sd))*150+200, sin(deg2rad($sd))*150+200,
     cos(deg2rad($sd))*150+200, sin(deg2rad($sd))*150+230,
     $front);
imageLine($img,
     cos(deg2rad($ed))*150+200, sin(deg2rad($ed))*150+200,
     cos(deg2rad($ed))*150+200, sin(deg2rad($ed))*150+230,
     $front);
header('Content-type: image/png');
imagepng($img);
imagedestroy($img);
?>

Even more efficiency:
The original code snippet and the following suggestions are inefficient in that they rely on the overlying php to fill vertically using loops rather than taking advantage of the underlying drawing routines. Also, this is done by repeatedly drawing filled partial elipses and circular calculations are typically expensive (PHP may use tables, I'm not sure) The original code could be rewritten as 
<?php
// Add the bottom layer.
 imagefilledarc($image, 50, 60, 100, 50, 0, 45, $darknavy, IMG_ARC_PIE);
 imagefilledarc($image, 50, 60, 100, 50, 45, 75 , $darkgray, IMG_ARC_PIE);
 imagefilledarc($image, 50, 60, 100, 50, 75, 360 , $darkred, IMG_ARC_PIE);
//Now do the joining pieces.
//Note: Precompute cosines and sines for efficiency
 $c1=50*cos(45/180*M_PI);
 $s1=25*sin(45/180*M_PI);
 $c2=50*cos(75/180*M_PI);
 $s2=25*sin(75/180*M_PI);
 $area1=array(100,60,100,50,50+$c1,50+$s1,50+$c1,60+$s1);
 $area2=array(50+$c1,50+$s1,50+$c1,60+$s1,50+$c2,60+$s2,50+$c2,50+$s2);
//Note that piece 3 goes round the corner. So we are only interested in the leftmost extent. You would need to do this programatically. Also, you do not need to make vertical parts for any segments completely at the back of the pie (in fact, not filledarcs either)
 $area3=array(50+$c2,50+$s2,50+$c2,60+$s2,0,60,0,50);
 imagefilledpolygon($image, $area1 , 4 , $darknavy);
 imagefilledpolygon($image, $area2 , 4 , $darkgray);
 imagefilledpolygon($image, $area3 , 4 , $darkred);
 imagefilledarc($image, 50, 50, 100, 50, 0, 45, $navy, IMG_ARC_PIE);
 imagefilledarc($image, 50, 50, 100, 50, 45, 75 , $gray, IMG_ARC_PIE);
 imagefilledarc($image, 50, 50, 100, 50, 75, 360 , $red, IMG_ARC_PIE);
?>
Note that the polygons are perhaps slightly inefficient. If there was an imagefilledtriangle, this code would be simpler. Given how fundamental triangles are, perhaps for a future version?
Rich

The examples given so far for drawing a 3D looking pie chart are extremely inefficient and can give a huge performance hit to scripts that draw a lot of pies and in particular those that do offline processing on disk, rather than send a single pie chart to the browser (either way this modification saves you a lot of CPU cycles).
Modify the portion of the code that creates the 3D effect to only draw the outline (with IMG_ARC_NOFILL) of the pie layers below the top filled pie:
// make the 3D effect (modified for the original example)
for ($i = 60; $i >= 50; $i--) {
  imagefilledarc($image, 50, $i, 100, 50, 0, 45, $darknavy, IMG_ARC_NOFILL);
 imagefilledarc($image, 50, $i, 100, 50, 45, 75 , $darkgray, IMG_ARC_NOFILL);
 imagefilledarc($image, 50, $i, 100, 50, 75, 360 , $darkred, IMG_ARC_NOFILL);
}
Note the >= on the for loop, which fills in a gap that is created without the =

I found some bugs in my script.. and therefore I am posting the fixes:
Bugs:
<?php
$drakcolor[2] = imagecolorallocate($im, 139, 0, 1);
//Should be
$darkcolor[2] = imagecolorallocate($im, 139, 0, 1);
?>
And then if you modify the code a little and, then make a image 200x125 then you won't be wasting space.
Changes:
<?php
$im = imagecreate (200, 125);
// AND
for ($i = 60; $i > 50; $i--) {
  imagefilledarc($im, 100, $i, 200, 100, $anglesum[$f], $anglesum[$n], $darkcolor[$f], IMG_ARC_PIE);
}
// AND
    imagefilledarc($im, 100, 50, 200, 100, $anglesum[$n], $anglesum[$i], $randcolor[$n], IMG_ARC_PIE);
?>
you can see a online demo at: http://webstatistik.lintoo.dk/

I modificed the code to make a 3d pie from data collected elsewhere.... in this case it was for a statistics page...
when testing you can use:
enjoy
<?php
//Making a image 200 x 200
$im = imagecreate (200, 200);
//Setting background color
$background = imagecolorallocate($im, 226, 226, 226);
//Setting colors of elements
$randcolor[0] = imagecolorallocate($im, 255, 203, 3);
$randcolor[1] = imagecolorallocate($im, 220, 101, 29);
$randcolor[2] = imagecolorallocate($im, 189, 24, 51);
$randcolor[3] = imagecolorallocate($im, 214, 0, 127);
$randcolor[4] = imagecolorallocate($im, 98, 1, 96);
$randcolor[5] = imagecolorallocate($im, 0, 62, 136);
$randcolor[6] = imagecolorallocate($im, 0, 102, 179);
$randcolor[7] = imagecolorallocate($im, 0, 145, 195);
$randcolor[8] = imagecolorallocate($im, 0, 115, 106);
$randcolor[9] = imagecolorallocate($im, 178, 210, 52);
$randcolor[10] = imagecolorallocate($im, 137, 91, 74);
$randcolor[11] = imagecolorallocate($im, 82, 56, 47);
//Setting the darker alt color to the main color
$darkcolor[0] = imagecolorallocate($im, 205, 153, 0);
$darkcolor[1] = imagecolorallocate($im, 170, 51, 0);
$drakcolor[2] = imagecolorallocate($im, 139, 0, 1);
$darkcolor[3] = imagecolorallocate($im, 164, 0, 77);
$darkcolor[4] = imagecolorallocate($im, 48, 0, 46);
$darkcolor[5] = imagecolorallocate($im, 0, 12, 86);
$darkcolor[6] = imagecolorallocate($im, 0, 52, 129);
$darkcolor[7] = imagecolorallocate($im, 0, 95, 145);
$darkcolor[8] = imagecolorallocate($im, 0, 65, 56);
$darkcolor[9] = imagecolorallocate($im, 128, 160, 2);
$darkcolor[10] = imagecolorallocate($im, 87, 41, 24);
$darkcolor[11] = imagecolorallocate($im, 32, 6, 0);
//Getting the data from GET
$i = 0;
while ($i <= 11) {
$data[$i] = $_GET[++$i];
}
//Getting ready
$datasum = array_sum($data);
$anglesum[0] = 0;
$angle[0] = 0;
$i = 0;
//Calc the start and end angle position of the elements
while ($i <= 11) {
  ++$i;
  $n = $i - 1;
  $part[$i] = $data[$n] / $datasum;
  $angle[$i] = floor($part[$i] * 360);
  $anglesum[$i] = array_sum($angle);
}
/*
//DEBUGGING - only for testing purposes
echo "<pre>";
print_r($part);
print_r($anglesum);
print_r($angle);
*/
// make the 3D effect
$n = 0;$i=0;
while ($n <= 11) {
  ++$n;
  $f = $n - 1;
  if ($angle[$n] != 0) {
    for ($i = 110; $i > 100; $i--) {
      imagefilledarc($im, 100, $i, 200, 100, $anglesum[$f], $anglesum[$n], $darkcolor[$f], IMG_ARC_PIE);
    }
  }
}
//make the 2d data that sits above the 3deffect
$i = 0;
while ($i <= 11) {
  ++$i;
  $n = $i - 1;
  if ($angle[$i] != 0) {
    imagefilledarc($im, 100, 100, 200, 100, $anglesum[$n], $anglesum[$i], $randcolor[$n], IMG_ARC_PIE);
  }  
}
// flush image
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>

if you want to place a text onto the edge of a circle you need to
get a point on the circle:
$pos_x=$radius*sin(deg2rad($angle));
$pos_y=sqrt($radius*$radius-$pos_x*$pos_x);
if you want the point to be in the middle of a pie piece
you need a starting and ending angle
$pos_x=$radius*sin(deg2rad($angle_end-($angle_start)/2));
$pos_y=sqrt($radius*$radius-$pos_x*$pos_x);
hope it helps

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.