Some suggestions...

Overall it seems great, but I have some suggestions to make graidle more useful:

1) The ability to set image width and height! (Feels like a must)
2) Color rotation (I noticed that when entering more values than colors in the pie chart, they all go black. If the colors would clycle from the beginning to avoid this it would be great!)
3) Adding both percent and values to the legend in pie-chart (as an option) - maybe exists, but I haven't seen it.

I noticed that on my very quick test on an older server, the ttf-font was missing - som manybe some information regarding the font or a fallback to system/gd/whatever-default

Otherwise it looks great, and I'll probably use it (esspecially if suggested improvements will be done)

I will comment point by point:

1) I will create two methods for set height and width (setHeight and setWidth) ;

2) For this point I had already thought two solutions:
one is to insert more colors;
the second one is create a method that sum two RGB colors existing in the Array.

3) I had not never thought this option, but i think is easy to implement this function.

About TTF font pointing I dont know if is possible include on Graidle package also "Vera Font" .

Very Many Thanks

Ale

All of your soggestion are avaible on new version (0.2.2) .
Best Regards Ale