Subversion Repositories Applications.papyrus

/*
        Copyright (c) 2004-2006, The Dojo Foundation
        All Rights Reserved.

        Licensed under the Academic Free License version 2.1 or above OR the
        modified BSD license. For more information on Dojo licensing, see:

                http://dojotoolkit.org/community/licensing.shtml
*/

dojo.provide("dojo.gfx.color.hsl");
dojo.require("dojo.lang.array");
dojo.lang.extend(dojo.gfx.color.Color, {toHsl:function () {
        return dojo.gfx.color.rgb2hsl(this.toRgb());
}});
dojo.gfx.color.rgb2hsl = function (r, g, b) {
        if (dojo.lang.isArray(r)) {
                b = r[2] || 0;
                g = r[1] || 0;
                r = r[0] || 0;
        }
        r /= 255;
        g /= 255;
        b /= 255;
        var h = null;
        var s = null;
        var l = null;
        var min = Math.min(r, g, b);
        var max = Math.max(r, g, b);
        var delta = max - min;
        l = (min + max) / 2;
        s = 0;
        if ((l > 0) && (l < 1)) {
                s = delta / ((l < 0.5) ? (2 * l) : (2 - 2 * l));
        }
        h = 0;
        if (delta > 0) {
                if ((max == r) && (max != g)) {
                        h += (g - b) / delta;
                }
                if ((max == g) && (max != b)) {
                        h += (2 + (b - r) / delta);
                }
                if ((max == b) && (max != r)) {
                        h += (4 + (r - g) / delta);
                }
                h *= 60;
        }
        h = (h == 0) ? 360 : Math.ceil((h / 360) * 255);
        s = Math.ceil(s * 255);
        l = Math.ceil(l * 255);
        return [h, s, l];
};
dojo.gfx.color.hsl2rgb = function (h, s, l) {
        if (dojo.lang.isArray(h)) {
                l = h[2] || 0;
                s = h[1] || 0;
                h = h[0] || 0;
        }
        h = (h / 255) * 360;
        if (h == 360) {
                h = 0;
        }
        s = s / 255;
        l = l / 255;
        while (h < 0) {
                h += 360;
        }
        while (h > 360) {
                h -= 360;
        }
        var r, g, b;
        if (h < 120) {
                r = (120 - h) / 60;
                g = h / 60;
                b = 0;
        } else {
                if (h < 240) {
                        r = 0;
                        g = (240 - h) / 60;
                        b = (h - 120) / 60;
                } else {
                        r = (h - 240) / 60;
                        g = 0;
                        b = (360 - h) / 60;
                }
        }
        r = Math.min(r, 1);
        g = Math.min(g, 1);
        b = Math.min(b, 1);
        r = 2 * s * r + (1 - s);
        g = 2 * s * g + (1 - s);
        b = 2 * s * b + (1 - s);
        if (l < 0.5) {
                r = l * r;
                g = l * g;
                b = l * b;
        } else {
                r = (1 - l) * r + 2 * l - 1;
                g = (1 - l) * g + 2 * l - 1;
                b = (1 - l) * b + 2 * l - 1;
        }
        r = Math.ceil(r * 255);
        g = Math.ceil(g * 255);
        b = Math.ceil(b * 255);
        return [r, g, b];
};
dojo.gfx.color.hsl2hex = function (h, s, l) {
        var rgb = dojo.gfx.color.hsl2rgb(h, s, l);
        return dojo.gfx.color.rgb2hex(rgb[0], rgb[1], rgb[2]);
};
dojo.gfx.color.hex2hsl = function (hex) {
        var rgb = dojo.gfx.color.hex2rgb(hex);
        return dojo.gfx.color.rgb2hsl(rgb[0], rgb[1], rgb[2]);
};