By simply changing the Chart Type in the App Part Properties you can change the rendering of the Graph.
Step 1: Create SharePoint Hosted App
I would strongly recommend following this excellent article on MSDN.
Step 2: Use the cross domain library to retrieve information from the host Web
In order to retrieve information from the host web we need to set the appmanifest permissions so that our app is allowed to read list items from the SharePoint web where we install our app.
- App permissions in SharePoint 2013
- How to: Access SharePoint 2013 data from apps using the cross-domain library
Step 3: Provision the required jChartFX libraries
Koen pointed me to the Getting Started section of the JChartFX site and I used this demo to get started.
Step 4: Create App Part
Hope it helps!