Protovis composes custom views of data with simple marks such as bars and dots. Unlike low-level graphics libraries that quickly become tedious for visualization, Protovis defines marks through dynamic properties that encode data, allowing inheritance, scales and layouts to simplify construction.
Protovis is free and open-source and is a Stanford project. It has been used in web interface R Node (which I will talk later )
While Protovis is designed for custom visualization, it is still easy to create many standard chart types. These simpler examples serve as an introduction to the language, demonstrating key abstractions such as quantitative and ordinal scales, while hinting at more advanced features, including stack layout.
Many charting libraries provide stock chart designs, but offer only limited customization; Protovis excels at custom visualization design through a concise representation and precise control over graphical marks. These examples, including a few recreations of unusual historical designs, demonstrate the language’s expressiveness.
Try Protovis today http://vis.stanford.edu/protovis/
- Linking Petterson – Visualising FRBR data with Protovis (home.hio.no)
- The Stanford Visualization Group Debuts Visual Tool for Cleaning Up Data (readwriteweb.com)