php dynamic pie chart conception problem

Hi guys,

i'm building a dynamic pic chart generator in php / ajax
i'm using GD for drawing arcs and printing values.

Problem is that I believe i'm bound to use GET parameter since the only way to re-draw an image is to change an img src=''

My image tag looks like this :
(fear not the %5B%5D, it means []. i'm using an array parameter)


Line number On/Off | Expand/Contract

<img src='./pie_draw.php?c%5B%5D=000000&v%5B%5D=25&c%5B%5D=FFFFFF&v%5B%5D=75' alt='bla' />



in short :
c[]=000000
v[]=25
c[]=FFFFFF
v[]=75

c = color hex code
v = % value

Now in pie_draw.php
I parse the parameter and draw 25% of the pie chart in black and 75% in white.

I'm using AJAX to allow using buttons to increase or decrease one element's value and draw a new pie chart accordingly without reloading the page.

Thing is I might want to add labels and size parameters later on..
So a GET parameter won't be enough as i'll get above the 255 allowed chars
Do you see an other way I could re-draw a picture, using alot of params without reloading the page?

 

use POST with AJAX (also possible)

Use google to search how to use POST with ajax! have fun!

 

Why do you think you are limited to 255 chars?