diff -r efd9c589177a -r c0b4a8b5a012 toolkit/javascript/nco/couleurs.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/nco/couleurs.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,95 @@
+/* -- Object for colors -- */
+
+function Couleurs() {	
+	switch (arguments.length) {
+	case 1:
+		if ("number"==typeof(arguments[0])) {
+			if (10==arguments[0]) {
+				this.get = d3.scale.category10();
+			}
+			else if (20==arguments[0]) {
+				this.get = d3.scale.category20();
+			}
+			else {
+				var domain = [], quantity = 0, colors = colorbrewer, 
+					setID, colorID, color;
+				var sets = ["BrBG", "PiYG", "PRGn", "PuOr", "RdBu", "RdYlBu", "RdYlGn"];
+				
+				while (quantity < arguments[0]) {
+					setID = 	Math.floor(Math.random()*7);
+					colorID = Math.floor(Math.random()*11);
+					color = Couleurs.fn.d3Color(
+							colors[sets[setID]][11][colorID]);
+					
+					var available = true;
+					for (var i = 0; i < quantity; i++) {
+						if (Math.abs(Couleurs.fn.hue(domain[i])
+								- Couleurs.fn.hue(color)) < 0.1) {
+							available = false;
+						}
+					}
+					
+					if (Couleurs.fn.brightness(color) < 0.9 && available) {
+						domain.push(color);
+						++quantity;
+					}
+				}
+				
+				// Transform into hexadecimal colors
+				for (var index in domain) {
+					domain[index] = domain[index].toString();
+				}
+				this.get = d3.scale.ordinal().range(domain);
+			}
+		}
+		else if (Array==arguments[0].constructor) {
+			var inputs = [];
+			for (var i in arguments[0]) {
+				inputs.push(i);
+			}
+			this.get = d3.scale.ordinal()
+				.domain(inputs)
+				.range(arguments[0]);
+		}
+		else {
+			throw "Wrong arguments";
+		}
+		break;
+		
+	case 3:
+		this.range = d3.interpolateRgb(arguments[0], arguments[1]);
+		this.levels = arguments[2];
+		this.get = this.getFromInterpolation;
+		break;
+
+	default:
+		throw "Wrong number of arguments";
+	}
+}
+
+Couleurs.fn = Couleurs.prototype = {
+	constructor: Couleurs,
+
+	d3Color: function(rgbString) {
+		return d3.rgb(rgbString);
+	},
+	
+	brightness: function(color) {
+		return (color.r + color.r + color.b + color.g + color.g + color.g)/(6*255);
+	},
+	
+	hue: function(color) {
+		return Math.sqrt(3) * (color.g - color.b)
+			/(color.r + color.r - color.g - color.b);
+	},
+	
+	getFromInterpolation: function(index) {
+		if (index<1) {
+			return this.range(index);
+		}
+		else {
+			index = (0==index%this.levels)? this.levels: index%this.levels; 
+			return this.range((index - 1)/(this.levels - 1));
+		}
+	}
+};
\ No newline at end of file