Powerful (but Easy) Data Visualization with the Graph Gem
summary
Builds full visualizations from XML using the graph gem and nokogiri, turning a 2,800-line lesson-dependency XML (about 500 lessons total) into colored, clustered graphs that reveal orphan nodes, long chains, and grade-level mismatches. Shows code that creates nodes and edges in ~10 lines, exports PNG/PDF, and automates generation with Hudson/Jenkins so updates push in about 45 seconds. Demonstrates animated student histories and practical uses for schema and dependency inspection.
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chapters (14)
- 0:00BLUE BLUE BOX GROUP
- 0:23We build adaptive educational software for children
- 2:38But it doesn't scale
- 5:07But let's use Ruby
- 7:47Shapes
- 10:21Help for the design impaired
- 10:42Uses Brewer Color Schemes
- 13:55Clustering
- 15:16Building from data
- 17:56Automated Updates
- 18:52Visualize Dependencies
- 19:36Dynamic Schema Diagrams
- 20:16Illustrate History
- 21:07Animation
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