Implement new chart type - Pie Chart

[KarthikRIyer]

A pie chart is a circular graph that shows the relative contribution that different categories contribute to an overall total. A wedge of the circle represents each category’s contribution, such that the graph resembles a pie that has been cut into different sized slices.

This task will require you to implement the following:

• A new plot type (PieChart) similar to LineChart, BarChart implemented currently. (Very basic implementation)
• Code to draw wedges using atleast two of the three renderers (AGG/SVG/CoreGraphics).

The input type can be Pair<StringConvertible , FloatConvertible>.
You can take a look at this for reference. But instead of drawing text over the chart we can use legends.

[anigasan]

Hi Karthik, Can I work on this task? I would like to build a pie chart similar to the example provided.

[anigasan]

I am GCI'19 participant

[KarthikRIyer]

Sure @anigasan . Be sure to claim the task on the GCI website and specify there which issue you plan to work on. Let me know if you need any help getting started.

[anigasan]

I am currently completing other task and wanted to get head-start for this task. Can I start work without claiming task? That way I will setup the environment, etc.?

[KarthikRIyer]

Sure!

[anigasan]

Thanks @KarthikRIyer ! I will start preparing for drawing basic pie-chart!! Which example that I should look at?

[anigasan]

or other modules (such as Line Chart, etc.)?

[KarthikRIyer]

Ananya, you can take a look at LineChart.swift to see how a Plot type is made. Also take a look at Renderer.swift, and the AGGRenderer , SVGRenderer and QuartzRenderer modules to see how primitives are to be drawn. There are a few other files you would need to see to understand how you the Plot type is created, for that just follow LineChart.swift and a search through the codebase for anything you need should point you to the correct file.

If you get stuck anywhere or need any help, please ask.

[anigasan]

Thanks and I will start getting myself familiar with the other

[WilliamHYZhang]

Great to see another GCI participant working on SwiftPlot. Good luck on your task!

P.S. If you'd like, in addition to legends, you can also try to use the new Text annotation to overlay text onto the pie chart.

[KarthikRIyer]

@anigasan are you still working on this? Any progress?

[anigasan]

Hi @KarthikRIyer, Due to one of the other tasks, I ran into space issues with my notebook and hence switched off my docker instance for the moment. I will be reinstalling Swift by Tue and will work on the task. Apologies for delay!!

[KarthikRIyer]

No worries. Just wanted to know if you were stuck somewhere.

[anigasan]

Thanks @KarthikRIyer !