(********************************************************************)
(*  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 10 on page 86
   Breakout without Bricks (1/2) *)

open Graphics

let left = 0.
let right = 300.
let down = 0.
let up = 200.

let ball = 5
let paddle = 50
let thick = 8

let gray = rgb 220 220 220

let init () =
  let s = Printf.sprintf " %dx%d" (truncate right) (truncate up) in
  open_graph s;
  auto_synchronize false

let clear () =
  set_color gray;
  fill_rect 0 0 (truncate right) (truncate up)

let get_paddle_pos () =
  let x = fst (mouse_pos ()) in
  max 0 (min x (truncate right - paddle))

let game x y =
  clear ();
  set_color black;
  fill_circle (truncate x) (truncate y) ball;
  let x = get_paddle_pos () in
  fill_rect x 0 paddle thick;
  synchronize ();
  x

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