PHP 5.5.16 is released

imagefilledarc

(PHP 4 >= 4.0.6, PHP 5)

imagefilledarcDraw a partial arc and fill it

Descrizione

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

Draws a partial arc centered at the specified coordinate in the given image.

Elenco dei parametri

image

Una risorsa immagine, restituita da una delle funzioni di creazione immagine, come imagecreatetruecolor().

cx

x-coordinate of the center.

cy

y-coordinate of the center.

width

The arc width.

height

The arc height.

start

The arc start angle, in degrees.

end

The arc end angle, in degrees. 0° is located at the three-o'clock position, and the arc is drawn clockwise.

color

A color identifier created with imagecolorallocate().

style

A bitwise OR of the following possibilities:

  1. IMG_ARC_PIE
  2. IMG_ARC_CHORD
  3. IMG_ARC_NOFILL
  4. IMG_ARC_EDGED
IMG_ARC_PIE and IMG_ARC_CHORD are mutually exclusive; IMG_ARC_CHORD just connects the starting and ending angles with a straight line, while IMG_ARC_PIE produces a rounded edge. IMG_ARC_NOFILL indicates that the arc or chord should be outlined, not filled. IMG_ARC_EDGED, used together with IMG_ARC_NOFILL, indicates that the beginning and ending angles should be connected to the center - this is a good way to outline (rather than fill) a 'pie slice'.

Valori restituiti

Restituisce TRUE in caso di successo, FALSE in caso di fallimento.

Esempi

Example #1 Creating a 3D looking pie

<?php

// create image
$image imagecreatetruecolor(100100);

// allocate some colors
$white    imagecolorallocate($image0xFF0xFF0xFF);
$gray     imagecolorallocate($image0xC00xC00xC0);
$darkgray imagecolorallocate($image0x900x900x90);
$navy     imagecolorallocate($image0x000x000x80);
$darknavy imagecolorallocate($image0x000x000x50);
$red      imagecolorallocate($image0xFF0x000x00);
$darkred  imagecolorallocate($image0x900x000x00);

// make the 3D effect
for ($i 60$i 50$i--) {
   
imagefilledarc($image50$i10050045$darknavyIMG_ARC_PIE);
   
imagefilledarc($image50$i100504575 $darkgrayIMG_ARC_PIE);
   
imagefilledarc($image50$i1005075360 $darkredIMG_ARC_PIE);
}

imagefilledarc($image505010050045$navyIMG_ARC_PIE);
imagefilledarc($image5050100504575 $grayIMG_ARC_PIE);
imagefilledarc($image50501005075360 $redIMG_ARC_PIE);


// flush image
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>

Il precedente esempio visualizzerĂ  qualcosa simile a:

Output of example : Creating a 3D looking pie

Note

Nota: Questa funzione necessita di GD 2.0.1 o successivi (raccomandato 2.0.28 o successivi).

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User Contributed Notes 14 notes

up
2
splogamurugan at gmail dot com
3 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();
?>
up
1
floripondia dot 88 at hotmail dot com
9 months ago
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);
?>
up
0
Christopher Kramer
4 years ago
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);
?>
up
0
mateusz dot charytoniuk at gmail dot com
5 years ago
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'
up
0
Mike
7 years ago
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);
?>
up
0
imazir at gmail dot com
8 years ago
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);
?>
up
0
paulcharltonthomson at hotmail dot com
9 years ago
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]);
    }

?>
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0
t_therkelsen at hotmail dot com
9 years ago
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);
?>
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0
rich at dicksonlife dot com
9 years ago
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
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0
micha _a.t_ psytrance _d.o.t_ info
9 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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0
poopie
10 years ago
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 =
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0
hans at lintoo dot dk
10 years ago
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);
?>
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0
caist - www.caist.com
10 years ago
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
up
-1
hans at lintoo dot dk
10 years ago
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/
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