imagefilledarc

add a note User Contributed Notes

imazir at gmail dot com
31-Jan-2006 06:53


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-Oct-2005 02:52


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
02-Jul-2005 02:00


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]); 

    } 



?>

05-Jun-2005 03:25


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);



?>

double-zonk at wp dot pl
09-Apr-2005 03:25


<?

$width = 300;

$height = 200;



$dane[] = 1;

$dane[] = 2;

$dane[] = 3;

$dane[] = 4;

$dane[] = 5;

$dane[] = 6;

$dane[] = 7;

$dane[] = 8;

$dane[] = 9;

$dane[] = 10;

$dane[] = 11;



// Kolory



$image = imageCreate($width, $height);

$background = imageColorAllocate($image, 205, 205, 205);



$kolor[0] = imageColorAllocate($image, 255, 203, 3);

$kolor[1] = imageColorAllocate($image, 220, 101, 29);

$kolor[2] = imageColorAllocate($image, 189, 24, 51);

$kolor[3] = imageColorAllocate($image, 214, 0, 127);

$kolor[4] = imageColorAllocate($image, 98, 1, 96);

$kolor[5] = imageColorAllocate($image, 0, 62, 136);

$kolor[6] = imageColorAllocate($image, 0, 102, 179);

$kolor[7] = imageColorAllocate($image, 0, 145, 195);

$kolor[8] = imageColorAllocate($image, 0, 115, 106);

$kolor[9] = imageColorAllocate($image, 178, 210, 52);

$kolor[10] = imageColorAllocate($image, 137, 91, 74);

$kolor[11] = imageColorAllocate($image, 82, 56, 47);



$cien[0] = imagecolorallocate($image, 205, 153, 0);

$cien[1] = imagecolorallocate($image, 170, 51, 0);

$cien[2] = imagecolorallocate($image, 139, 0, 1);

$cien[3] = imagecolorallocate($image, 164, 0, 77);

$cien[4] = imagecolorallocate($image, 48, 0, 46);

$cien[5] = imagecolorallocate($image, 0, 12, 86);

$cien[6] = imagecolorallocate($image, 0, 52, 129);

$cien[7] = imagecolorallocate($image, 0, 95, 145);

$cien[8] = imagecolorallocate($image, 0, 65, 56);

$cien[9] = imagecolorallocate($image, 128, 160, 2);

$cien[10] = imagecolorallocate($image, 87, 41, 24);

$cien[11] = imagecolorallocate($image, 32, 6, 0);



// Oblicznia



$suma = array_sum($dane);



$stopnie = 0;

for($i = 0; $i < count($dane); $i++){

    $start[$i]= $stopnie;

    $stop[$i] = $stopnie + round(($dane[$i] / $suma) * 360, 0);

    $stopnie = $stop[$i];

}



$x = $width / 2;

$size = $width / 10;

$y = $height / 2 - $size / 2 - 1;



// Wyswietlanie

for($g = $size; $g > 0; $g--){

    for($n = 0; $n < count($dane); $n++){

        imagefilledarc($image, $x, $y+$g, $width, $height - $size, $start[$n], $stop[$n], $cien[$n], IMG_ARC_PIE);

    }

}



for($i = 0; $i < count($dane); $i++){

    imagefilledarc($image, $x, $y, $width, $height - $size, $start[$i], $stop[$i], $kolor[$i], IMG_ARC_PIE);



}



header("Content-type: image/png");

imagePNG($image);

imageDestroy($image);

?>

t_therkelsen at hotmail dot com
08-Mar-2005 05:21


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);

?>

braulio at example dot com
04-Mar-2005 12:54


He aadido un par de cosillas al ejemplo de "hans at lintoo dot dk", sobre todo el grosor (thickness) del efecto 3D...



<?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];

}

*/

$data = array( 100, 200, 50, 40);    /* datos a mostrar ( menos de 12 valores ) */

$num_data = count ($data);



//Getting ready

$datasum = array_sum($data);

$anglesum[0] = 0;

$angle[0] = 0;

$i = 0;



//Se calcula el comienzo y final de la posicin de los ngulos de los elementos

while ($i < $num_data) {

   ++$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);

*/



// Variables posicion

$cx = 120;

$cy = 100;

$ancho = 100;

$largo = 2 * $ancho;  // relacin de aspecto

$grosor = 25;  // efecto 3D



// make the 3D effect

for ($g = $grosor; $g > 0; $g--) {

    $n = 0;

    while ($n < $num_data) {

           ++$n;

           $f = $n - 1;

           if ($angle[$n] != 0)

           imagefilledarc($im, $cx, $cy + $g, $largo, $ancho, $anglesum[$f], $anglesum[$n], $darkcolor[$f], IMG_ARC_PIE);

    }

}

//make the 2d data that sits above the 3deffect

$i = 0;

while ($i < $num_data) {

   ++$i;

   $n = $i - 1;

   if ($angle[$i] != 0) {

       imagefilledarc($im, $cx, $cy, $largo, $ancho, $anglesum[$n], $anglesum[$i], $randcolor[$n], IMG_ARC_PIE);

   }

}



// flush image

header('Content-type: image/png');

imagepng($im);

imagedestroy($im);

?>

rich at dicksonlife dot com
24-Sep-2004 10:22


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
09-Sep-2004 10:09


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
06-Aug-2004 12:08


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
18-Jul-2004 03:14


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-Jul-2004 06:27


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
08-Jan-2004 12:11


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

jphb at scit dot wlv dot ac dot uk
10-Jul-2003 01:19


Note that whereas imagefilledarc() measures angles from 

3 o'clock clockwise, imagettftext() measures angles from

3 o'clock anticlockwise so if you're, for example, trying to

annotate a pie chart it can get a bit confusing.

jcoder at insightbb dot com
05-Oct-2002 10:29


/*

From a set of numbers from a query return and an

array of colors this will generate a pie chart

*/



$a=array();

while($d=mysql_fetch_array($start_angle_query))

     {

     $a[]=$d[0];

     }



$b=array();

$b =$a;



/* make two arrays one for start of angle 2nd

for end of angle

*/

$sum=array_sum($a);

$degree_adjuster=360/$sum; 

//constant for circle

array_unshift($a,0 ); 

// add 0 for start angle

$start_angle=array(); 

// new array to hold values for start vector

$end_angle=array();  

//new array to hold values for end vector

array_pop($a); 

//trim one array for start so numbers don't end on 360

while($a) //iterate till array is empty

{

array_push($start_angle,(end($start_angle)+ $a[0]));



/*enter numbers in array $start_angle adding the last number in

array and adding the first number from modified original array*/



array_shift($a);//delete first value of array

}

while($b)

{

array_push($end_angle,(end($end_angle)+$b[0]));

array_shift($b);

}

for($i=0;$i<$angle_num_rows;$i++)

{

imagefilledarc($pie,130,149,260,260,

($start_angle[$i]*$degree_adjuster),$end_angle[$i]*$degree_adjuster,

$colors[$i],IMG_ARC_FILL);

}

add a note

imagefilledarc

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