288 lines
6.5 KiB
OCaml
288 lines
6.5 KiB
OCaml
(***********************************************************************)
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(* *)
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(* Objective Caml *)
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(* *)
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(* Pierre Weis, projet Cristal, INRIA Rocquencourt *)
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(* *)
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(* Copyright 2000 Institut National de Recherche en Informatique et *)
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(* en Automatique. All rights reserved. This file is distributed *)
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(* under the terms of the GNU Library General Public License. *)
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(* *)
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(***********************************************************************)
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(* graph_test.ml : tests various drawing and filling primitives of the
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Graphics library. *)
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(* To run this example just load this file into a suitable toplevel.
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Alternatively execute
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ocamlc graphics.cma graph_test.ml *)
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open Graphics;;
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auto_synchronize false;;
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display_mode false;;
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remember_mode true;;
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let sz = 450;;
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open_graph (Printf.sprintf " %ix%i" sz sz);;
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(* To be defined for older versions of O'Caml
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Lineto, moveto and draw_rect.
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let rlineto x y =
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let xc, yc = current_point () in
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lineto (x + xc) (y + yc);;
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let rmoveto x y =
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let xc, yc = current_point () in
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moveto (x + xc) (y + yc);;
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let draw_rect x y w h =
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let x0, y0 = current_point () in
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moveto x y;
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rlineto w 0;
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rlineto 0 h;
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rlineto (- w) 0;
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rlineto 0 (-h);
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moveto x0 y0;;
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*)
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(* A set of points. *)
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set_color foreground;;
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let dashes y =
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for i = 1 to 100 do
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plot y (2 * i);
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plot y (3 * i);
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plot y (4 * i);
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done;;
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dashes 3;;
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set_line_width 20;;
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dashes (sz - 20);;
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(* Drawing chars *)
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draw_char 'C';
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draw_char 'a';
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draw_char 'm';
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draw_char 'l';;
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(* More and more red enlarging squares *)
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moveto 10 10;;
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set_line_width 5;;
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let carre c =
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rlineto 0 c;
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rlineto c 0;
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rlineto 0 (- c);
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rlineto (- c) 0;;
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for i = 1 to 10 do
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moveto (10 * i) (10 * i);
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set_color (rgb (155 + 10 * i) 0 0);
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carre (10 * i)
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done;;
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(* Blue squares in arithmetic progression *)
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moveto 10 210;;
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set_color blue;;
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set_line_width 1;;
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for i = 1 to 10 do
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carre (10 * i)
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done;;
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(* Tiny circles filled or not *)
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rmoveto 0 120;;
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(* Must not change the current point *)
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fill_circle 20 190 10;;
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set_color green;;
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rlineto 0 10;;
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rmoveto 50 10;;
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let x, y = current_point () in
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(* Must not change the current point *)
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draw_circle x y 20;;
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set_color black;;
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rlineto 0 20;;
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(* Cyan rectangles as a kind of graphical representation *)
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set_color cyan;;
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let lw = 15;;
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set_line_width lw;;
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let go_caption l = moveto 210 (130 - lw + l);;
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let go_legend () = go_caption (- 3 * lw);;
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go_caption 0;;
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fill_rect 210 130 5 10;;
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fill_rect 220 130 10 20;;
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fill_rect 235 130 15 40;;
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fill_rect 255 130 20 80;;
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fill_rect 280 130 25 160;;
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(* A green rectangle below the graph. *)
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set_color green;;
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rlineto 50 0;;
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(* A black frame for each of our rectangles *)
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set_color black;;
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set_line_width (lw / 4);;
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draw_rect 210 130 5 10;;
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draw_rect 220 130 10 20;;
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draw_rect 235 130 15 40;;
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draw_rect 255 130 20 80;;
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draw_rect 280 130 25 160;;
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(* A black rectangle after the green one, below the graph. *)
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set_line_width lw;;
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rlineto 50 0;;
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(* Write a text in yellow on a blue background. *)
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(* x = 210, y = 70 *)
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go_legend ();;
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set_text_size 10;;
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set_color (rgb 150 100 250);;
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let x,y = current_point () in
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fill_rect x (y - 5) (8 * 20) 25;;
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set_color yellow;;
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go_legend ();;
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draw_string "Graphics (Caml)";;
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(* Pie parts in different colors. *)
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let draw_green_string s = set_color green; draw_string s;;
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let draw_red_string s = set_color red; draw_string s;;
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moveto 120 210;;
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set_color red;;
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fill_arc 150 260 25 25 60 300;
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draw_green_string "A ";
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draw_red_string "red";
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draw_green_string " pie.";
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set_text_size 5;
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moveto 180 240;
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draw_red_string "A "; draw_green_string "green"; draw_red_string " slice.";;
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set_color green;
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fill_arc 200 260 25 25 0 60;
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set_color black;
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set_line_width 2;
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draw_arc 200 260 27 27 0 60;;
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(* Should do nothing since this is a line *)
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set_color red;;
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fill_poly [| (40, 10); (150, 70); (150, 10); (40, 10) |];;
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set_color blue;;
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(* Drawing polygones. *)
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(* Redefining the draw_poly primitive for the usual library. *)
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let draw_poly v =
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let l = Array.length v in
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if l > 0 then begin
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let x0, y0 = current_point () in
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let p0 = v.(0) in
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let x, y = p0 in moveto x y;
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for i = 1 to l - 1 do
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let x, y = v.(i) in lineto x y
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done;
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lineto x y;
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moveto x0 y0
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end;;
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draw_poly [| (150, 10); (150, 70); (260, 10); (150, 10) |];;
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(* Filling polygones. *)
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(* Two equilateral triangles, one red and one blue, and their inside
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filled in black. *)
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let equi x y l =
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[| (x - l / 2, y);
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(x, y + int_of_float (float_of_int l *. (sqrt 3.0 /. 2.0)));
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(x + l / 2, y) |];;
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set_color black;;
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fill_poly (Array.append (equi 300 20 40) (equi 300 44 (- 40)));;
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set_line_width 1;;
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set_color cyan;;
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draw_poly (equi 300 20 40);;
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set_color red;;
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draw_poly (equi 300 44 (- 40));;
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(* Drawing and filling ellipses. *)
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let x, y = current_point () in
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rlineto 10 10; moveto x y;
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moveto 395 100;;
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let x, y = current_point () in
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fill_ellipse x y 25 15;;
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set_color (rgb 0xFF 0x00 0xFF);;
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rmoveto 0 (- 50);;
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let x, y = current_point () in
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fill_ellipse x y 15 30;;
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rmoveto (- 45) 0;;
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let x, y = current_point () in
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draw_ellipse x y 25 10;;
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(* Drawing and filling arcs. *)
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let draw_arc_ellipse x y r1 r2 =
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set_color green;
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draw_arc x y r1 r2 60 120;
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set_color black;
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draw_arc x y r1 r2 120 420;;
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set_line_width 3;;
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let draw_arc_ellipses x y r1 r2 =
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let step = 5 in
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for i = 0 to (r1 - step) / (2 * step) do
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for j = 0 to (r2 - step) / (2 * step) do
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draw_arc_ellipse x y (3 * i * step) (3 * j * step)
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done
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done;;
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draw_arc_ellipses 20 128 15 50;;
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let fill_arc_ellipse x y r1 r2 c1 c2 =
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set_color c1;
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fill_arc x y r1 r2 60 120;
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set_color c2;
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fill_arc x y r1 r2 120 420;;
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let fill_arc_ellipses x y r1 r2 =
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let step = 3 in
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let c1 = ref black
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and c2 = ref yellow in
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let exchange r1 r2 = let tmp = !r1 in r1 := !r2; r2 := tmp in
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for i = r1 / (2 * step) downto 10 do
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for j = r2 / (2 * step) downto 30 do
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exchange c1 c2;
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fill_arc_ellipse x y (3 * i) (3 * j) !c1 !c2
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done
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done;;
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fill_arc_ellipses 400 240 150 200;;
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synchronize ();;
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(* transparent color drawing *)
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set_color transp;;
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draw_circle 400 240 50;;
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draw_circle 400 240 40;;
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draw_circle 400 240 30;;
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(* try to go back a normal color *)
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set_color red;;
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draw_circle 400 240 20;;
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synchronize ();;
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input_line stdin;;
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