Initial data commit

Task/Draw-a-clock/OCaml/draw-a-clock-1.ocaml

@@ -0,0 +1,65 @@
+#!/usr/bin/env ocaml
+#load "unix.cma"
+#load "graphics.cma"
+open Graphics
+
+let pi = 4.0 *. atan 1.0
+let angle v max = float v /. max *. 2.0 *. pi
+
+let () =
+  open_graph "";
+  set_window_title "OCaml Clock";
+  resize_window 256 256;
+  auto_synchronize false;
+  let w = size_x ()
+  and h = size_y () in
+  let rec loop () =
+    clear_graph ();
+
+    let point radius r a =
+      let x = int_of_float (radius *. sin a)
+      and y = int_of_float (radius *. cos a) in
+      fill_circle (w/2+x) (h/2+y) r;
+    in
+    set_color (rgb 192 192 192);
+    point 84.0 8 0.0;
+    point 84.0 8 (angle  90 360.0);
+    point 84.0 8 (angle 180 360.0);
+    point 84.0 8 (angle 270 360.0);
+    set_color (rgb 224 224 224);
+    point 84.0 6 (angle  30 360.0);
+    point 84.0 6 (angle  60 360.0);
+    point 84.0 6 (angle 120 360.0);
+    point 84.0 6 (angle 150 360.0);
+    point 84.0 6 (angle 210 360.0);
+    point 84.0 6 (angle 240 360.0);
+    point 84.0 6 (angle 300 360.0);
+    point 84.0 6 (angle 330 360.0);
+
+    set_line_width 9;
+    set_color (rgb 192 192 192);
+    draw_circle (w/2) (h/2) 100;
+
+    let tm = Unix.localtime (Unix.gettimeofday ()) in
+    let sec = angle tm.Unix.tm_sec 60.0 in
+    let min = angle tm.Unix.tm_min 60.0 in
+    let hour = angle (tm.Unix.tm_hour * 60 + tm.Unix.tm_min) (24.0 *. 60.0) in
+    let hour = hour *. 2.0 in
+
+    let hand t radius width color =
+      let x = int_of_float (radius *. sin t)
+      and y = int_of_float (radius *. cos t) in
+      set_line_width width;
+      set_color color;
+      moveto (w/2) (h/2);  rlineto x y;
+    in
+    hand sec  90.0 2 (rgb 0 128 255);
+    hand min  82.0 4 (rgb 0 0 128);
+    hand hour 72.0 6 (rgb 255 0 128);
+
+    synchronize ();
+    Unix.sleep 1;
+    loop ()
+  in
+  try loop ()
+  with _ -> close_graph ()

Task/Draw-a-clock/OCaml/draw-a-clock-2.ocaml

@@ -0,0 +1,66 @@
+let pi = 4.0 *. atan 1.0
+let angle v max = float v /. max *. 2.0 *. pi
+
+let draw area _ =
+  let cr = Cairo_lablgtk.create area#misc#window in
+  let { Gtk.width = width; Gtk.height = height } = area#misc#allocation in
+  let scale p = float (min width height) *. 0.5 *. p in
+  let center_x, center_y = float width /. 2.0, float height /. 2.0 in
+  let invert_y y = float height -. y in
+
+  Cairo.set_source_rgb cr 0.8 0.8 0.8;
+  Cairo.paint cr;  (* background *)
+
+  Cairo.set_source_rgb cr 1.0 1.0 1.0;
+
+  Cairo.arc cr center_x center_y (scale 0.9) 0.0 (2.0 *. pi);
+  Cairo.set_line_width cr (scale 0.02);
+  Cairo.stroke cr;
+
+  let point a =
+    let radius = (scale 0.9) in
+    let x = radius *. sin a
+    and y = radius *. cos a in
+    let r = scale 0.04 in
+    Cairo.arc cr (center_x +. x) (invert_y (center_y +. y)) r 0.0 (2.0 *. pi);
+    Cairo.fill cr;
+  in
+  for i = 0 to pred 12 do
+    point (angle (i * 30) 360.0)
+  done;
+
+  let tm = Unix.localtime (Unix.gettimeofday ()) in
+  let sec = angle tm.Unix.tm_sec 60.0 in
+  let min = angle tm.Unix.tm_min 60.0 in
+  let hour = angle (tm.Unix.tm_hour * 60 + tm.Unix.tm_min) (12.0 *. 60.0) in
+
+  Cairo.set_line_cap cr Cairo.LINE_CAP_ROUND;
+
+  let hand t radius lwidth (r, g, b) =
+    let x = radius *. sin t
+    and y = radius *. cos t in
+    Cairo.set_line_width cr (scale lwidth);
+    Cairo.move_to cr center_x center_y;
+    Cairo.line_to cr (center_x +. x) (invert_y (center_y +. y));
+    Cairo.set_source_rgb cr r g b;
+    Cairo.stroke cr;
+  in
+  hand sec  (scale 0.9) 0.04 (0.0, 0.5, 1.0);
+  hand min  (scale 0.7) 0.06 (0.0, 0.0, 0.5);
+  hand hour (scale 0.6) 0.09 (1.0, 0.0, 0.5);
+  true
+
+let animate area =
+  ignore (GMain.Timeout.add 200 (fun () ->
+    GtkBase.Widget.queue_draw area#as_widget; true))
+
+let () =
+  let w = GWindow.window ~title:"OCaml GtkCairo Clock" () in
+  ignore (w#connect#destroy GMain.quit);
+  let f = GBin.frame ~shadow_type:`IN ~packing:w#add () in
+  let area = GMisc.drawing_area ~width:200 ~height:200 ~packing:f#add () in
+  area#misc#set_double_buffered true;
+  ignore (area#event#connect#expose (draw area));
+  animate area;
+  w#show ();
+  GMain.main ()