Public: Technology Reviews : Graph and Data Visualization Review
This page last changed on Sep 30, 2009 by stepheneb.
HTML 5. All the new browsers support this except Internet Explorer (esp. IE 8). ExCanvas is a workaround for IE.
Supports vector graphics. (SVG for the web.) Older technology is VML, which works with IE.
Canvas is part of most browsers, such as Firefox.
For an advisory panel meeting we may want to use Java to demo some ideas.
In RITES, using Flotr, students can control graphs in some ways (e.g., dragging axes) and authors control in other ways (e.g., labeling axes). Potentially authors could have check boxes to select which features students could control directly.
Flotr could show any data we want. Other technologies can, too. Some show only slowly; some can show quickly (like a sound graph). Canvas can probably work quickly; SVG probably not. Sources could be other students, or a probe, or a model, or many others.
Raphael JS: SVG is more like Adobe Illustrator (vector graphics). It supports a hierarchy. If you use Raphael it works in IE. Example of graphing programmers' coding time (shown thru GITHUB, a social coding site). Can highlight parts of a pie graph. Mouseover can display coordinates of the line in a line graph.
The library supports more than just graphs – e.g. interact with a map.
Very fluid in moving from one graph to another (e.g., January data to February data).
Raphael keeps records about itself better than Canvas – easier to save data or "listen" for events. But either can be used; just more work in Canvas. Easier to program in Raphael. However the extra structure in Raphael may slow it down if a big data file is involved. Fast or large data structures might be better in Canvas. Raphael seems robust.
Can drag points on a line and the line reshapes itself.
GEONEXT: Dynamic Math software. GEONEXT has Java applets for constructing geometry interactives.
Different types of graphs: bar, line, pie, line with dots on the line, etc. Dynamic bar chart with a slider. Interactive geometry – quite lovely with colored segments etc. Similar in some ways to Java Sketchpad.
JSXGraph can import data from GEONEXT documents.
Statistics with R (through a server).
Time series double exponential smoothing.
Turtle "programming". Gestural recognition.
GeoSite: GeoSite an the GeometryEditor is designed and developed by Xun Lai, is part of the WME ("Web-based Mathematics Education|http://wme.cs.kent.edu/)] project led by Dr. Paul Wang, at Department of Computer Science, Kent State University. GeometryEditor uses open Web technology SVG (Scalable Vector Graphics) and MathML (Mathematical Markup Language). It does not work on IE yet.
Protovis. Similar to Raphael. Interesting ways to display data (like Tufte). Chart types. Overlay Tufte-like map onto a Google map. Wide range of data displays. Heat maps.
Carolyn: We have not seen a linkage between a data table and a graph.
MySystem: You can connect a "system" of parts. Uses Canvas now; transitioning to Raphael.
Outline drag-and-drop in a browser (Firefox): This capability is part of HTML 5.
Drag data from a Spreadsheet into a table component in a browser
I can imagine using this capability for:
Google motion chart: Has a Play button.
This Google technology uses software developed at gapminder (which Google bought). Here's a great gapminder demo using a world countries dataset – this is similar to some of the functionalities that TERC developed about 15 years ago with their TableTop software. TableTop also included interactive Venn diagrams.
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