Drawing a filled arc

[Anon]

Hi there!
I'm having problem to fill an arc in a cicle, the first quarte for eg.
Here's what I am doing, but I am getting a lot of blank spaces in the image (most of the near the edges)
for($i=0;$i<=90;$i++)

{
$rad =deg2rad($i);
$x1 = 250;
$y1 = 200;
$x2 = 250 + (cos($rad) 100);
$y2 = 200 - (sin($rad) 100);

imageline($im,250,200,(float)$x2,(float)$y2,$arc);
imageline($im,250,200,ceil($x2),ceil($y2),$arc);
imageline($im,250,200,floor($x2),floor($y2),$arc);
imageline($im,250,200,ceil($x2),ceil($y2),$arc);
imageline($im,250,200,round($x2),round($y2),$arc);

}

the reason I used floor, ceil, round, is that I've seen a reduction of the number of blank spaces when combining those.
If anyone knows how to do it, please tell me.
PS: I'm tryng to do a pie chart

[]s
Vinicius

[[deleted]]

Manuals are your friends. Read them. Just for once I wish somebody would read the manuals.. :-)

use imagearc to draw the edge of your partial circle:

http://www.php.net/manual/en/function.imagearc.php

Then use the lines you already had to draw two lines from the center to the edge(one at 0 deg, one at 90 deg) creating an enclosed space.

Then use imagefill to fill up the empty space.

http://www.php.net/manual/en/function.imagefill.php