While there are a number of useful GWT-based chart implementations, many of them are based in Flash or are otherwise a bit heavyweight. Although there are some that work really well and are very nice (there's a really cool-looking one for Ext GWT), sometimes you just want a simple chart without any external dependencies.
The Google Charts API allows you to create charts on the fly via a URL-based API. It returns a static generated image of your chart. This makes for a powerful, yet extremely lightweight tool. While this API is clearly exposed on their site, there does not seem to exist, essentially, a standardized wrapper for this that caters to GWT.
My implementation of Google Charts for GWT simply provides that wrapper. Certainly, if you want something flashy and dynamic, this tool is not for you, you want the heavier tools I alluded to earlier. But for a quick, lightweight tool with a number of customizable features, give this a whirl.
It is currently in the alpha stages, meaning that it is functional but is not completely documented and may contain some weird behavior. I would like to test the implementation more aggressively and finish off the full API feature set. Right now, though, you can create Bar, Line, Pie, and Scatter Charts, complete with features for Chart Legends, Shape Markers, custom colors and chart axes, multiple data sets, and more.
Check out my Google Charts for GWT samples here (with example source code):
Download the source code and samples from:
https://github.com/GoGoCarl/google-charts-gwt
The project you're looking for is located in trunk/modules/com.solertium.util.gwt.charts
Hopefully this is useful. I'm very open to criticism and suggestions going into further development of this project.
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Carl Scott
Software Developer, Solertium Corporation
