Created by Christopher Manning
This is a map of the Chicago Wards that demonstrates how to use the JSTS Topology Suite and D3.js to find and display intersections between polygons.
Wards shaded grey are scanned since their bounding boxes intersect with the search envelope and wards shaded blue intersect with the search
Created by Christopher Manning
The wards in Chicago were recently remapped and I was mesmerized by the idea of creating an interaction that would animate the transition from the old to the new wards. I shortly found out that tweening polygons in a non-intersecting and interlocked fashion is a complicated topic. I've done a lot of reading about the math and research that has been done in this space and found a few interesting theories which I would like to implement in a future version. Currently, the morphing/tweening/interpolation is done with an array interpolator. Unfortunately, this technique causes the intermediate polygons to self-intersect and morph inefficiently. Ideally, I would overlay these polygons on a slippy map and there
| SankeyR <- function(inputs, losses, unit, labels, format="plot"){ | |
| ######################## | |
| # SankeyR version 1.01 (updated August 10, 2010) | |
| # is a function for creating Sankey Diagrams in R. | |
| # See http://www.sankey-diagrams.com for excellent examples of Sankey Diagrams. | |
| # | |
| # OPTIONS: | |
| # 'inputs' is a vector of input values | |
| # 'losses' is a vector of loss values | |
| # 'unit' is a string of the unit |