package rtree

Values are stored in the Rtree and must provide a means of calculating an envelope (minimal bounding box).

An example

A two-dimensional lines that uses Rectangle as a bounding box could be implemented as

module Line = struct
  type t = { p0 : float * float; p1 : float * float }

  let t =
    let open Repr in
    record "line" (fun p0 p1 -> { p0; p1 })
    |+ field "p0" (pair float float) (fun t -> t.p0)
    |+ field "p1" (pair float float) (fun t -> t.p1)
    |> sealr

  type envelope = Rtree.Rectangle.t

  let envelope { p0 = (x1, y1); p1 = (x2, y2) } =
    let x0 = Float.min x1 x2 in
    let x1 = Float.max x1 x2 in
    let y0 = Float.min y1 y2 in
    let y1 = Float.max y1 y2 in
    Rtree.Rectangle.v ~x0 ~y0 ~x1 ~y1
end

Note that a runtime representation must also be provided.

Interface