geomBox

import std.array : array;
import std.algorithm : map;
import std.range : repeat, iota, chain, zip;
import std.random : uniform;
auto xs = iota(0,50,1).map!((x) => uniform(0.0,5)+uniform(0.0,5)).array;
auto cols = "a".repeat(25).chain("b".repeat(25)).array;
auto aesRange = zip(xs, cols)
    .map!((a) => aes!("x", "colour", "fill", "label")(a[0], a[1], 0.45, a[1]));
auto gb = geomBox( aesRange );
assertEqual( gb.front.xStore.min(), -0.4 );