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(***********************************************************************)
(* *)
(* Active-DVI *)
(* *)
(* Projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 2002 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the GNU Lesser General Public License. *)
(* *)
(* Jun Furuse, Didier Rmy and Pierre Weis. *)
(* Contributions by Roberto Di Cosmo, Didier Le Botlan, *)
(* Xavier Leroy, and Alan Schmitt. *)
(* *)
(* Based on Mldvi by Alexandre Miquel. *)
(***********************************************************************)
(* $Id: dvicolor.ml,v 1.1 2007/01/18 14:14:36 rousse Exp $ *)
open Graphics;;
type color = GraphicsY11.color;;
let cmyk c m y k =
(* found at http://community.borland.com/article/0,1410,17948,00.html *)
(* I believe this is not at all correct...
but there is no free alternatives. *)
let r = if c +. k < 1.0 then 1.0 -. (c +. k) else 0.0 in
let g = if m +. k < 1.0 then 1.0 -. (m +. k) else 0.0 in
let b = if y +. k < 1.0 then 1.0 -. (y +. k) else 0.0 in
let f c = Misc.round (c *. 255.0) in
rgb (f r) (f g) (f b);;
let color_of_hsb h s b =
let nround x y = (2 * x + y) / (2 * y) in
let mxround x = nround (0xFF * x) 0xFF in
let h = h * 6 in
let i = h / 0xFF * 0xFF in
let f = h - i in
let m = b * (0xFF - s) / 0xFF
and n = b * (0xFF - s * f / 0xFF) / 0xFF
and k = b * (0xFF - s * (0xFF - f) / 0xFF) / 0xFF in
match i / 0xFF with
| 0 | 6 -> rgb (mxround b) (mxround k) (mxround m)
| 1 -> rgb (mxround n) (mxround b) (mxround m)
| 2 -> rgb (mxround m) (mxround b) (mxround k)
| 3 -> rgb (mxround m) (mxround n) (mxround b)
| 4 -> rgb (mxround k) (mxround m) (mxround b)
| 5 -> rgb (mxround b) (mxround m) (mxround n)
| _ -> failwith "rgb_of_hsb";;
let dvips_named_colors = [
"GreenYellow", (cmyk 0.15 0. 0.69 0.);
"Yellow", (cmyk 0. 0. 1.0 0.);
"Goldenrod", (cmyk 0. 0.10 0.84 0.);
"Dandelion", (cmyk 0. 0.29 0.84 0.);
"Apricot", (cmyk 0. 0.32 0.52 0.);
"Peach", (cmyk 0. 0.50 0.70 0.);
"Melon", (cmyk 0.0 0.46 0.50 0.);
"YellowOrange", (cmyk 0.0 0.42 1.0 0.);
"Orange", (cmyk 0.0 0.61 0.87 0.);
"BurntOrange", (cmyk 0.0 0.51 1.0 0.);
"Bittersweet", (cmyk 0.0 0.75 1.0 0.24);
"RedOrange", (cmyk 0.0 0.77 0.87 0.);
"Mahogany", (cmyk 0.0 0.85 0.87 0.35);
"Maroon", (cmyk 0.0 0.87 0.68 0.32);
"BrickRed", (cmyk 0.0 0.89 0.94 0.28);
"Red", (cmyk 0.0 1.0 1.0 0.);
"OrangeRed", (cmyk 0.0 1.0 0.50 0.);
"RubineRed", (cmyk 0.0 1.0 0.13 0.);
"WildStrawberry", (cmyk 0.0 0.96 0.39 0.);
"Salmon", (cmyk 0.0 0.53 0.38 0.);
"CarnationPink", (cmyk 0.0 0.63 0.0 0.);
"Magenta", (cmyk 0.0 1.0 0.0 0.);
"VioletRed", (cmyk 0.0 0.81 0.0 0.);
"Rhodamine", (cmyk 0.0 0.82 0.0 0.);
"Mulberry", (cmyk 0.34 0.90 0.0 0.02);
"RedViolet", (cmyk 0.07 0.90 0.0 0.34);
"Fuchsia", (cmyk 0.47 0.91 0.0 0.08);
"Lavender", (cmyk 0.0 0.48 0.0 0.);
"Thistle", (cmyk 0.12 0.59 0.0 0.);
"Orchid", (cmyk 0.32 0.64 0.0 0.);
"DarkOrchid", (cmyk 0.40 0.80 0.20 0.);
"Purple", (cmyk 0.45 0.86 0.0 0.);
"Plum", (cmyk 0.50 1.0 0.0 0.);
"Violet", (cmyk 0.79 0.88 0.0 0.);
"RoyalPurple", (cmyk 0.75 0.90 0.0 0.);
"BlueViolet", (cmyk 0.86 0.91 0.0 0.04);
"Periwinkle", (cmyk 0.57 0.55 0.0 0.);
"CadetBlue", (cmyk 0.62 0.57 0.23 0.);
"CornflowerBlue", (cmyk 0.65 0.13 0.0 0.);
"MidnightBlue", (cmyk 0.98 0.13 0.0 0.43);
"NavyBlue", (cmyk 0.94 0.54 0.0 0.);
"RoyalBlue", (cmyk 1.0 0.50 0.0 0.);
"Blue", (cmyk 1.0 1.0 0.0 0.);
"Cerulean", (cmyk 0.94 0.11 0.0 0.);
"Cyan", (cmyk 1.0 0.0 0.0 0.);
"ProcessBlue", (cmyk 0.96 0.0 0.0 0.);
"SkyBlue", (cmyk 0.62 0.0 0.12 0.);
"Turquoise", (cmyk 0.85 0.0 0.20 0.);
"TealBlue", (cmyk 0.86 0.0 0.34 0.02);
"Aquamarine", (cmyk 0.82 0.0 0.30 0.);
"BlueGreen", (cmyk 0.85 0.0 0.33 0.);
"Emerald", (cmyk 1.0 0.0 0.50 0.);
"JungleGreen", (cmyk 0.99 0.0 0.52 0.);
"SeaGreen", (cmyk 0.69 0.0 0.50 0.);
"Green", (cmyk 1.0 0.0 1.0 0.);
"ForestGreen", (cmyk 0.91 0.0 0.88 0.12);
"PineGreen", (cmyk 0.92 0.0 0.59 0.25);
"LimeGreen", (cmyk 0.50 0.0 1.0 0.);
"YellowGreen", (cmyk 0.44 0.0 0.74 0.);
"SpringGreen", (cmyk 0.26 0.0 0.76 0.);
"OliveGreen", (cmyk 0.64 0.0 0.95 0.40);
"RawSienna", (cmyk 0.0 0.72 1.0 0.45);
"Sepia", (cmyk 0.0 0.83 1.0 0.70);
"Brown", (cmyk 0.0 0.81 1.0 0.60);
"Tan", (cmyk 0.14 0.42 0.56 0.);
"Gray", (cmyk 0.0 0.0 0.0 0.50);
"Black", (cmyk 0.0 0.0 0.0 1.0);
"White", (cmyk 0.0 0.0 0.0 0.);
];;
let gr_named_color = [
"black", black;
"white", white;
"red", red;
"green", green;
"blue", blue;
"yellow", yellow;
"cyan", cyan;
"magenta", magenta;
];;
let named_colors =
let color_htable = Hashtbl.create 83 in
let add_named_color (n, c) =
Hashtbl.add color_htable (String.lowercase n) c in
List.iter add_named_color gr_named_color;
List.iter add_named_color dvips_named_colors;
color_htable;;
let find_named_color n = Hashtbl.find named_colors (String.lowercase n);;
let default_color = find_named_color "gray";;
let parse_color s =
(* Try known colors *)
try
let c = find_named_color s in
c
with Not_found ->
try
let {Color.r = r; Color.g = g; Color.b = b} = Color.color_parse s in
rgb r g b
with _ ->
(* Try an explicit 0xFFFFFF integer *)
int_of_string s;;
let cannot_understand_color s =
Misc.warning
(Printf.sprintf "cannot understand %S color specification." s);
default_color;;
let parse_color_encoding s l =
match s, l with
| "rgb", [rs; gs; bs] ->
let r = Misc.round (255.0 *. float_of_string rs)
and g = Misc.round (255.0 *. float_of_string gs)
and b = Misc.round (255.0 *. float_of_string bs) in
rgb r g b
| "cmyk", [cs; ms; ys; ks] ->
let c = float_of_string cs
and m = float_of_string ms
and y = float_of_string ys
and k = float_of_string ks in
cmyk c m y k
| ("gray" | "grey"), [gs] ->
let g = Misc.round (255.0 *. float_of_string gs) in
rgb g g g
| "hsb", [hs; ss; bs] ->
let h = int_of_string hs
and s = int_of_string ss
and b = int_of_string bs in
color_of_hsb h s b
| s, [] ->
parse_color s
| s, l ->
(* Unknown color encoding, just fail
(parse_color will return some plausible result). *)
failwith s;;
let parse_color_args = function
| s :: l ->
(* Try the regular way first. *)
(try parse_color_encoding s l with
(* If it fails, emit a warning and give a default gray *)
| Failure _ -> cannot_understand_color s)
| [] -> cannot_understand_color "[]";;
|