Graph/Chart Design

We need a configurable design template for a graph, with a more sophisticated design than anything available from MS Excel. Initially it will be displayed on our website, [login to view URL], so it should be designed to fit that look and feel, but the colours scheme needs to be configurable. We have some ideas about the type of graph that should be used to display the data which we may share, but would prefer to see your thoughts first. Other requirements: 1. The format of the data is as follows: There are 3 pieces of data for each time period (currently 1 day) - the number of positive tweets about the subject, - the number of negative tweets (likely to vary from several hundred to tens of thousands) - the average sentiment score (which will always be between -1 and 1) 2. It must be possible to configure the timeframe e.g. 1 min, 1 hour, 1 day, 1 week, 1 month 3. graph should display in format that works on PC, Tablet and mobile e.g. html5 (and expect to use javascript) and not require a download 4. The design must be flexible enough to look good regardless of the score and the number of tweets 5. (Desired, but not compulsory) Ability to automatically extract data from Amazon S3 bucket when loading the graph - please state whether or not you will be able to do this An example data set is attached.