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imagefilledarc - Ugly code to create a pie chart

Posted on 2004-08-17
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Last Modified: 2009-12-16
This is really ugly, but it seems to work. Now how to improve it???
I pull an array from my db called $graphValues, and pull a sum to get a $total - the $total will represent 360 degrees of the pie chart:

     // Figure out start and end points for each graph segment
     $degperhit = 360 / $total;                     //  360 / Total # of hits = # of degrees per unit

Then I turn $graphValues into a temp array so I can screw around with it, ie. Figure out start and end values for imagefilledarc by turning the sum of the actual values into how many degrees of the circle it will be, rounded down with 'floor', and then drop a value and do it again.

     $tempValArray = $graphValues;                      // temp array to work with for segment start and end values
     for($i = count($tempValArray); $i > 0; $i--){
      $almostStart[] = floor(array_sum($tempValArray)*$degperhit);
      array_pop($tempValArray);
      }
     $almostStart = array_reverse($almostStart);
This will give me end values as is.

           $endArray = $almostStart;

Start values set by adding a 0 to the front of the array, then dropping the last value, which will always be 360

      array_unshift($almostStart, "0");
      array_pop($almostStart);

      $startArray = $almostStart;
------------------------------------------------------

This is pretty darn ugly right? Any thoughts on a 'cleaner' or more efficient way of doing it???






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Question by:winglis4
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by:winglis4
ID: 11822644
A little more,
then I draw the chart with this:
(image is 400x400)


for ($i=0; $i < count($endArray); $i++){
imagefilledarc($image, 200, 200, 380, 240, $startArray[$i],  $endArray[$i], $colorArray[$i], IMG_ARC_PIE);
}
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snoyes_jw earned 250 total points
ID: 11822982
Have you look into JPGraph?  Might be easier than doing this all the hard way.
http://www.aditus.nu/jpgraph/index.php
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by:winglis4
ID: 11823068
Yeah, I really want to try it on my own (well, almost on my own, hehe) as a learning experience. I've done some bar graphs, but wanted to stretch my brain and see if I could get the same data into a pie chart. I may get JPGraph for the 'real' production of my graphs, though.

I really was psyched that I figured out how to get the db values into degrees, and how to get it all into a format that imagefililedarc could use. It ain't pretty but it works!!! :-)
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LVL 25

Assisted Solution

by:Marcus Bointon
Marcus Bointon earned 250 total points
ID: 11828653
I can vouch for JPGraph too. This is also a very nice solution - not nearly as flexible, but much better looking:

http://www.maani.us/charts/index.php?menu=Introduction
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LVL 5

Author Comment

by:winglis4
ID: 11837938
I just played around with JPGraph a bit - not bad!!! :-)
I gotta give props to Squinky, though. Those Flash graphs look too good!!!!

Thanks fellas.
winglis4
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