notes on noncontiguous cartograms and ActionScript 3 classes for producing them
Fully contiguous cartograms have stretched and distorted borders but perfectly maintained topologies. Like the Gastner-Newman diffusion-based cartograms we see all over the place. Though all sorts of cartogram designs have been produced, those with perfect topology preservation (fully contiguous cartograms) receive the majority of [...]
posts tagged 'code'
Dec 04 2008
noncontiguous area cartograms
Jun 09 2008
isolining package for ActionScript 3
A week or so back I wrote about a package I ported/modified to create the Delaunay triangulation in Flash with a few AS3 classes. As I noted there, such a triangulated irregular network (TIN) allows us to interpolate isolines — lines of constant value (aka isarithms, commonly called contours).
So, given a field of points [...]
May 24 2008
delaunay triangulation in ActionScript 3
update: for a cool usage of Delaunay triangulation, see my isolining package for ActionScript 3
The Delaunay triangulation was invented in 1934 by Boris Delaunay. According to Paul Bourke,
The Delaunay triangulation is closely related geometrically to the Direchlet tesselation also known as the Voronoi or Theissen tesselations. These tesselations split the plane into a [...]