Added pie charts

[Brad Larson]

I just added a rudimentary pie chart implementation in CPPieChart, based on suggestions by Cocan Lucian. It's very similar to the existing CPBarChart class, using delegate methods to provide fills for each slice of the pie:

-(CPFill *)sliceFillForPieChart:(CPPieChart *)pieChart recordIndex:(NSUInteger)index;

and labels for each slice:

-(CPTextLayer *)sliceLabelForPieChart:(CPPieChart *)pieChart recordIndex:(NSUInteger)index;

When supplying numerical values to the pie chart, it will sum up the values and normalize them such that the whole pie is 1.0. It will then draw an arc for the relative portion each value occupies in the whole. Slices currently are drawn clockwise in the order in which they are provided to the chart, with the first slice having its starting edge be pointing vertically upward.

An example of this new class can be found in the iPhone test application: http://twitpic.com/xrh8n

Cocoa bindings support is incomplete, and labeling is currently missing, so there's still quite a bit to finish here. It's a start, though.

______________________
Brad Larson, Ph.D.
Sunset Lake Software
http://www.sunsetlakesoftware.com

[Ernest Prabhakar]

An excellent start -- great work!

[Drew McCormack]

Yeah, good work Brad!

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