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Encircle Scatterplot with alpha shapes

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Using alpha shapes to group or “encircle” sets of points.

It’s not fast, but it’s fun.

DISCLAIMER: this code is quite hackish, don’t copy it blindly.

TODO: buffer the shapes so that they nicely enclose dots as ggplot2’s geom_encircle function does.

The scatterplot matrix visualizations pairwise correlations for multi-dimensional data; each cell in the matrix is a scatterplot. This example uses Anderson’s data of iris flowers on the Gaspé Peninsula. Scatterplot matrix design invented by J. A. Hartigan; see also R and GGobi. Data on Iris flowers collected by Edgar Anderson and published by Ronald Fisher.

S Forked from mbostock’s Scatterplot Matrix Brushing.