Hexagonal binning of points in the plane (spec/06 §9, #348): d3-hexbin's lattice of
flat-topped hexagons, the columns 2 r sin(π/3) apart and the rows 1.5 r, every odd
row offset by half a column. The lattice is in the coordinates of the points, so a chart
bins pixels.
Examples
iex> [cell] = Visualize.Layout.Hexbin.bin([{1, 1}, {-1, 2}], 20)
iex> {cell.x, cell.y, cell.count}
{0.0, 0.0, 2}Summary
Functions
The non-empty cells of the lattice over points, in lattice order (row, then column).
The closed flat-topped hexagon of radius at the centre, its first vertex at bearing
−30° (the upper right), then clockwise on screen.
Types
@type cell() :: %{ x: float(), y: float(), count: pos_integer(), points: [{number(), number()}] }
A non-empty cell: its centre, its count and its points in input order.
Functions
The non-empty cells of the lattice over points, in lattice order (row, then column).
@spec hexagon(number(), number(), number()) :: Visualize.IR.Path.t()
The closed flat-topped hexagon of radius at the centre, its first vertex at bearing
−30° (the upper right), then clockwise on screen.