(********************************************************************)
(*  OCaml code from the book ``Learn Programming with OCaml''       *)
(*  See https://usr.lmf.cnrs.fr/lpo/                                *)
(*                                                                  *)
(*  Sylvain Conchon and Jean-Christophe Filliâtre                   *)
(*  Copyright 2025 Université Paris-Saclay and CNRS                 *)
(*                                                                  *)
(*  Openly licensed via CC BY SA 4.0                                *)
(*  See https://creativecommons.org/licenses/by-sa/4.0/deed.en      *)
(********************************************************************)

(* Program 3 on page 28
   Drawing a Cardioid *)

open Graphics

let () = open_graph " 300x200"

let () =
  moveto 200 150;
  for i = 0 to 200 do
    let th = atan 1. *. float i /. 25. in
    let r = 50. *. (1. -. sin th) in
    lineto (150 + truncate (r *. cos th))
           (150 + truncate (r *. sin th))
  done;
  ignore (read_key ())

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