minpoly

A minimum polygon data set, with a small concavity and a single hole. The data is in 'xy.coords' form, with two columns for 'x_' and 'y_' values, with 'NA' rows separating separate polygon paths. (All but the first path are holes).

Examples

plot(minpoly)
polypath(minpoly, col = "grey", rule = "evenodd")
lines(na.omit(minpoly))  ## see the connection in the sequence
nas <- which(is.na(minpoly$x_))
## this is the "indicate where holes start" convention
hole_index <- nas - (seq_along(nas) - 1)
minpoly_xy <- na.omit(minpoly)
tri_index <- earcut(minpoly_xy, hole_index)
rearcut:::plot_tri(minpoly_xy$x_, minpoly_xy$y_, tri_index)
rearcut:::plot_tri(minpoly_xy$x_, minpoly_xy$y_, tri_index, col = "firebrick")