PHP Doku:: Draw a partial arc and fill it - function.imagefilledarc.html

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geompse at gmail dot com
24.06.2010 22:18


Be aware of :

 - $start and $end are INT (10,1 = 10 ; 359,5 = 360)

 - if ($start == $end), then a full disc is drawn



Examples :

<?php



 $start = 0; // 0deg

 $end = 360; // 360deg

 #=> filled disc (360 degrees arc)



 $start = 0; // 0deg

 $end = 50; // 360deg

 #=> filled arc (50 degrees arc)



 $start = 0;

 $end = 1;

 #=> 1 degree filled arc



 $start = 0;

 $end = 0,2;

 #=> filled disc [unexpected]



 $start = 0;

 $end = 1,4;

 #=> 1 degree filled arc [unexpected loss of precision]



 $start = 359.9;

 $end = 360;

 #=> filled disc [unexpected]



?>



I hope this note will help YOU saving time and patience... working with pie charts !

Christopher Kramer
17.09.2009 13:25


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);

?>

mateusz dot charytoniuk at gmail dot com
26.02.2009 18:31


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'

Mike
14.08.2007 21:43


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);

?>

imazir at gmail dot com
31.01.2006 11:53


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);

?>

Byron at theworks dot net dot nz
11.10.2005 8:52


try this,

<?

$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($i=0;$z<=$sz;$z++){

    for($i=0;$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($i=0;$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);

?>

paulcharltonthomson at hotmail dot com
2.07.2005 8:00


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]); 

    } 



?>

4.06.2005 21:25


For 3D-graphs you will want to have a nice shadow. Here is an easy wat to calculate a good matching shadow to a color.

$color is the color for the pie-piece above, $shadow_color is the shadow under it.



<?php



$mask = 0; //0 for darker, 255 for brighter

$percent = 0.70; //between 0.40 (very different) and 0.99 (almost the same)



$R = rand(0, 124); // } between 0,124 if your background color is white

$G = rand(0, 124); // } between 124,255 if your background color is black

$B = rand(0, 124); // } or play with these values



$RS = round($R * $percent) + round($mask * (1-$percent));

$GS = round($G * $percent) + round($mask * (1-$percent));

$BS = round($B * $percent) + round($mask * (1-$percent));



$color = imagecolorallocate( $im, $R, $G, $B);

$shadow_color = imagecolorallocate( $im, $RS, $GS, $BS);



?>

t_therkelsen at hotmail dot com
8.03.2005 10:21


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);

?>

rich at dicksonlife dot com
24.09.2004 16:22


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

micha _a.t_ psytrance _d.o.t_ info
9.09.2004 4:09


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.

poopie
6.08.2004 6:08


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 =

hans at lintoo dot dk
17.07.2004 21:14


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/

hans at lintoo dot dk
17.07.2004 0:27


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);

?>

caist - www.caist.com
7.01.2004 17:11


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

Ein Service von Reinhard Neidl - Webprogrammierung.

imagefilledarc

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