Pie chart generator

[Skeleten Neteleks]

Hi, I have been looking for a very specific pie chart generator.

There would be 8 drop down boxes that a visitor would select from, each containing numbers from 0 to 10.

When submitting the form, a image of a pie chart is generated based on those results.

I have found scripts that do this, but not quite how I want the pie chart to be displayed.

The pie chart should not have an outer ring. The segments should be equal width and the value of each segment should be represented by the height of that particular segment.

So a segment value of 10 would be the highest from the central point, and 5 would be half way and 0 would be no segment at all.

The segments should also have different colours.

Could anyome point me in the direction of this script (if it exists)? many many thanks :)

[maxim]

i dont know of any scripts. but if its something custom then looks into PHP's GD extention. It has the abilty to do what you want. you will need to read up on GD, so hit up google

[nogray]

Check this site out,

http://www.maani.us/charts/index.php

[Barand]

save as oddpie.php
[code]<?php
$vals = explode('|',$_GET['vals']);

$image = imagecreate(420,420);
$white = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
$a    = imagecolorallocate($image, 0xC0, 0xC0, 0xC0);
$b    = imagecolorallocate($image, 0x90, 0x90, 0x90);
$c    = imagecolorallocate($image, 0x00, 0x00, 0xFF);
$d    = imagecolorallocate($image, 0x00, 0x00, 0x90);
$e    = imagecolorallocate($image, 0xFF, 0x00, 0x00);
$f    = imagecolorallocate($image, 0x90, 0x00, 0x00);
$g    = imagecolorallocate($image, 0x00, 0xFF, 0x00);
$h    = imagecolorallocate($image, 0x00, 0x90, 0x00);
$colArray = array($a,$b,$c,$d,$e,$f,$g,$h);
$cx = $cy = 210;
$theta = 0;
$col = 0;
foreach ($vals as $val) {
$r = $val*200 / 10;
imagefilledarc($image,$cx, $cy, $r, $r, $theta, $theta+45, $colArray[$col], IMG_ARC_PIE);
$theta += 45;
$col++;
}
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>[/code]

Run this
[code]<?php
if (isset($_GET['submit'])) {
$vals = join ('|', $_GET['pieval']);
echo "<IMG src=oddpie.php?vals=$vals>" ;
echo '<hr>';
}
echo '<FORM>';
for ($s=0; $s<8; $s++) {
echo '<SELECT name="pieval[]">';
for ($i=0; $i<=10; $i++) {
    echo "<option value='$i'>$i</option>";
}
echo '</select>';
}
echo '<input type="submit" name="submit" value="Submit">';
echo '</form>';
?>[/code]

[Skeleten Neteleks]

Thank you very much, I am sorry for the delay in responding. I will let you know how it goes.

[Skeleten Neteleks]

Hi thanks, I tried it. The segments with a higher value seem to be wider than the smaller ones. I was looking for a set width for each segment. No worries anyway, thanks for your help. :)

[Barand]

All segments are exactly the same width of 45 degrees

[Skeleten Neteleks]

my eyes play tricks on me! thank you

[Barand]

if it helps, this version draws the radials.

[code]<?php
$vals = explode('|',$_GET['vals']);

$image = imagecreate(420,420);
$white = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
$a    = imagecolorallocate($image, 0xC0, 0xC0, 0xC0);
$b    = imagecolorallocate($image, 0x90, 0x90, 0x90);
$c    = imagecolorallocate($image, 0x00, 0x00, 0xFF);
$d    = imagecolorallocate($image, 0x00, 0x00, 0x90);
$e    = imagecolorallocate($image, 0xFF, 0x00, 0x00);
$f    = imagecolorallocate($image, 0x90, 0x00, 0x00);
$g    = imagecolorallocate($image, 0x00, 0xFF, 0x00);
$h    = imagecolorallocate($image, 0x00, 0x90, 0x00);
$blk  = imagecolorallocate($image, 0x00, 0x00, 0x00);
$colArray = array($a,$b,$c,$d,$e,$f,$g,$h);
$cx = $cy = 210;
$alpha = 0;
$col = 0;

foreach ($vals as $val) {
$r = $val*40;
$theta = 45; 
imagefilledarc($image,$cx, $cy, $r, $r, $alpha, $theta+$alpha, $colArray[$col], IMG_ARC_PIE);
$alpha += $theta;
$col++;
}
for ($alpha=0; $alpha<360; $alpha += 45) {
$alpharad = deg2rad($alpha);
imageline($image,$cx,$cy, $cx+200*cos($alpharad), $cy+200*sin($alpharad),$blk);
for ($i=40; $i<=400; $i+=40) {
imagefilledarc($image,$cx, $cy, $i, $i, $alpha-2, $alpha+2, $blk, IMG_ARC_NOFILL);
}

}
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>
[/code]

[Skeleten Neteleks]

brill, thanks!