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imagefilledarc

(PHP 4 >= 4.0.6, PHP 5)

imagefilledarcDessine un arc partiel et le remplit

Description

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

Dessine un arc partiel, centré aux coordonnées spécifiées dans l'image fournie.

Liste de paramètres

image

Une ressource d'image, retournée par une des fonctions de création d'images, comme imagecreatetruecolor().

cx

X : coordonnée du centre.

cy

Y : coordonnée du centre.

width

La largeur de l'arc.

height

La hauteur de l'arc.

start

L'angle de début de l'arc, en degrés.

end

L'angle de fin de l'arc, en degrés. 0° est situé à une position de 3 heures sur un cadran horaire, et l'arc est dessiné dans le sens des aiguilles d'une montre.

color

Un identifiant de couleur, créé par la fonction imagecolorallocate().

style

Un champ d'octets, combiné avec l'opérateur OR :

  1. IMG_ARC_PIE
  2. IMG_ARC_CHORD
  3. IMG_ARC_NOFILL
  4. IMG_ARC_EDGED
IMG_ARC_PIE et IMG_ARC_CHORD sont mutuellement exclusives; IMG_ARC_CHORD ne fait que connecter les angles de début et de fin avec une ligne droite, tandis que IMG_ARC_PIE produit une ligne courbe. IMG_ARC_NOFILL indique que l'arc (ou corde) doit être dessiné mais pas rempli. IMG_ARC_EDGED, utilisé conjointement avec IMG_ARC_NOFILL, indique que les angles de début et de fin doivent être connectés au centre. Cette fonction est recommandée pour faire les graphiques de type camembert.

Valeurs de retour

Cette fonction retourne TRUE en cas de succès ou FALSE si une erreur survient.

Exemples

Exemple #1 Création d'un camembert en 3D

<?php

// Création de l'image
$image imagecreatetruecolor(100100);

// Allocation de quelques couleurs
$white    imagecolorallocate($image0xFF0xFF0xFF);
$gray     imagecolorallocate($image0xC00xC00xC0);
$darkgray imagecolorallocate($image0x900x900x90);
$navy     imagecolorallocate($image0x000x000x80);
$darknavy imagecolorallocate($image0x000x000x50);
$red      imagecolorallocate($image0xFF0x000x00);
$darkred  imagecolorallocate($image0x900x000x00);

// Création de l'effet 3D
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);


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

L'exemple ci-dessus va afficher quelque chose de similaire à :

Affichage de l'exemple : Création d'un graphique 3D

Notes

Note: Cette fonction requiert la bibliothèque GD 2.0.1 ou supérieure (2.0.28 ou supérieure est recommandée).

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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
5 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]);
    }

?>
up
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
10 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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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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