Zooming a chart

Hi All,

I have successfully created a heatmap using GWT graphics (composite widget).

Since the dataset is huge heapmap created is also pretty huge.
I was wondering if there is any way to include zoom feature to the chart so that i can make it more useful and informative.

I am attaching the sample image with this post.
Any idea on how to do it will be really helpful and greatly appreciated !!

Thanks,
Deepak
12205.png