Tuesday, June 26th, 2007

Chronoscope: GWT Charting and Vector Graphics platform

Category: GWT, Java, JavaScript, Library

>Ray Cromwell and his team released Chronoscope a GWT based charting and vector graphics platform:

We aim to bring the Google Maps experience to exploration of time series data. Using GWT, we have created a chart
component which creates zoomable views of very large datasets (20,000+ points), stylable with CSS, mashupable with
Javascript API and Microformats, Bookmarkable chart start, Google Map style overlays/”pushpins”/”infowindows”,
both server-side and client-side chart rendering, and a future storyboard animation system to allow presentation
driven chart tours.

Features

Chronoscope

Posted by Dion Almaer at 5:57 am
10 Comments

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3.9 rating from 31 votes

10 Comments »

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hmm.. dragging doesn’t work perfectly. drag the lower time track to the right – displayed time goes forward. don’t release mouse button and drag it to the left – displayed time will still go forward…

Comment by mare — June 26, 2007

another hmmm: using IE 6, i am not seeing the charts, but with FF it renders fine. didn’t try IE 7. awesome concept tho, i can see number-centric companies eating this stuff up.

Comment by GBG — June 26, 2007

IE7 seems good. I found the navigation awkward (Home key, shift-tab etc). Rubber-band zooming and right-click with options (rather than just help) would be nice.

http://simile.mit.edu/timeline/ is still my fav time/event ajax interface

Comment by amackay11 — June 26, 2007

Opps… not IE7 friendly.

Comment by amackay11 — June 26, 2007

This feels a bit clunky, but it’s a good start. I think the simile timeline is really slick, but has a different focus (ie: mapping discreet events, not trends).

Comment by Adam Sanderson — June 26, 2007

Safari won’t like it!

Comment by Christian Effenberger — June 26, 2007

Safari 3 Beta likes it just fine actually… Safari 3 supports SVG better than any other browser on the market today.

Comment by Dylan Schiemann — June 26, 2007

Though it looks like they are using canvas for this :)

Comment by Dylan Schiemann — June 26, 2007

it’s still java.

Comment by jorne — June 27, 2007

Sorry, I didn’t see this sooner. (I’m the author) The FAQ on the left covers why IE currently isn’t supported and why scrolling is slow. Scrolling used to be accomplished by rendering a larger-than-visible canvas and then adjusting top/left while redrawing offscreen portions as needed, but that was changed for the public demo because of some new features that were added at the last minute (right now, it just re-renders everything on scroll) An upcoming version will revert to smooth-scrolling, as well as feature many rendering optimizations.

Ultimately, there will be the option of rendering to a Flash canvas, which will support IE, as well as the opportunity to run with the Flash JIT.

Yes, it’s “still Java” and that’s on purpose. It was originally written in hand-written JavaScript, but it proved untenable to supporting our requirements which are fallbacks to server-side rendering, as well as supporting diverse mobile environments (e.g. MIDLets). GWT+Java gets us all Java devices and environments (e.g. server-side image rendering) and all JS devices (e.g. iPhone), pure JS doesn’t.

There is also a FAQ entry that covers this (http://timepedia.org/ChronoscopeFAQ.html#whygwt) because of the inevitable language war zealots :)

-Ray

Comment by Ray Cromwell — June 29, 2007

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