2 * Farbtastic Color Picker 1.2
3 * © 2008 Steven Wittens
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 //Adapted to uniform style with jQuery UI widgets and slightly change behavior
22 // - remove duplicated code by replacing it with jquery.colorUtils and modern jQuery
23 // - uniform code style
25 jQuery.fn.farbtastic = function (callback) {
26 $.farbtastic(this, callback);
30 jQuery.farbtastic = function (container, callback) {
31 var container = $(container).get(0);
32 return container.farbtastic || (container.farbtastic = new jQuery._farbtastic(container, callback));
35 jQuery._farbtastic = function (container, callback) {
36 // Store farbtastic object
40 $(container).html('<div class="farbtastic ui-widget-content"><div class="color"></div><div class="wheel"></div><div class="overlay"></div><div class="h-marker marker"></div><div class="sl-marker marker"></div></div>');
41 $(container).addClass('ui-widget');
42 var e = $('.farbtastic', container);
43 fb.wheel = $('.wheel', container).get(0);
49 // Fix background PNGs in IE6
50 if (navigator.appVersion.match(/MSIE [0-6]\./)) {
51 $('*', e).each(function () {
52 if (this.currentStyle.backgroundImage != 'none') {
53 var image = this.currentStyle.backgroundImage;
54 image = this.currentStyle.backgroundImage.substring(5, image.length - 2);
56 'backgroundImage': 'none',
57 'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src='" + image + "')"
64 * Link to the given element(s) or callback.
66 fb.linkTo = function (callback) {
67 // Unbind previous nodes
68 if (typeof fb.callback == 'object') {
69 $(fb.callback).unbind('keyup', fb.updateValue);
75 // Bind callback or elements
76 if (typeof callback == 'function') {
77 fb.callback = callback;
79 else if (typeof callback == 'object' || typeof callback == 'string') {
80 fb.callback = $(callback);
81 fb.callback.bind('keyup', fb.updateValue);
82 if (fb.callback.get(0).value) {
83 fb.setColor(fb.callback.get(0).value);
88 fb.updateValue = function (event) {
89 if (this.value != fb.color) {
90 fb.setColor(this.value);
95 * Change color with HTML syntax #123456
97 fb.setColor = function (color) {
98 var rgb = $.colorUtil.getRGB( color );
99 if (fb.color != color && rgb) {
100 rgb = rgb.slice( 0 ); //make a clone
101 //TODO: rewrite code so that this is not needed
107 fb.hsl = fb.RGBToHSL(fb.rgb);
114 * Change color with HSL triplet [0..1, 0..1, 0..1]
116 fb.setHSL = function (hsl) {
118 fb.rgb = fb.HSLToRGB(hsl);
119 fb.color = fb.pack(fb.rgb);
124 /////////////////////////////////////////////////////
127 * Retrieve the coordinates of the given event relative to the center
130 fb.widgetCoords = function (event) {
131 var ref = $( fb.wheel ).offset();
133 x: event.pageX - ref.left - fb.width / 2,
134 y: event.pageY - ref.top - fb.width / 2
141 fb.mousedown = function (event) {
143 if (!document.dragging) {
144 $(document).bind('mousemove', fb.mousemove).bind('mouseup', fb.mouseup);
145 document.dragging = true;
148 // Check which area is being dragged
149 var pos = fb.widgetCoords(event);
150 fb.circleDrag = Math.max(Math.abs(pos.x), Math.abs(pos.y)) * 2 > fb.square;
160 fb.mousemove = function (event) {
161 // Get coordinates relative to color picker center
162 var pos = fb.widgetCoords(event);
164 // Set new HSL parameters
166 var hue = Math.atan2(pos.x, -pos.y) / 6.28;
167 if (hue < 0) hue += 1;
168 fb.setHSL([hue, fb.hsl[1], fb.hsl[2]]);
171 var sat = Math.max(0, Math.min(1, -(pos.x / fb.square) + .5));
172 var lum = Math.max(0, Math.min(1, -(pos.y / fb.square) + .5));
173 fb.setHSL([fb.hsl[0], sat, lum]);
181 fb.mouseup = function () {
183 $(document).unbind('mousemove', fb.mousemove);
184 $(document).unbind('mouseup', fb.mouseup);
185 document.dragging = false;
189 * Update the markers and styles
191 fb.updateDisplay = function () {
193 var angle = fb.hsl[0] * 6.28;
194 $('.h-marker', e).css({
195 left: Math.round(Math.sin(angle) * fb.radius + fb.width / 2) + 'px',
196 top: Math.round(-Math.cos(angle) * fb.radius + fb.width / 2) + 'px'
199 $('.sl-marker', e).css({
200 left: Math.round(fb.square * (.5 - fb.hsl[1]) + fb.width / 2) + 'px',
201 top: Math.round(fb.square * (.5 - fb.hsl[2]) + fb.width / 2) + 'px'
204 // Saturation/Luminance gradient
205 $('.color', e).css('backgroundColor', fb.pack(fb.HSLToRGB([fb.hsl[0], 1, 0.5])));
207 // Linked elements or callback
208 if (typeof fb.callback == 'object') {
209 // Set background/foreground color
211 backgroundColor: fb.color,
212 color: fb.hsl[2] > 0.5 ? '#000' : '#fff'
215 // Change linked value
216 $(fb.callback).each(function() {
217 if ( $( this ).val() != fb.color) {
218 $( this ).val( fb.color ).change();
222 else if (typeof fb.callback == 'function') {
223 fb.callback.call(fb, fb.color);
227 /* Various color utility functions */
228 fb.pack = function (rgb) {
229 var r = Math.round(rgb[0] * 255);
230 var g = Math.round(rgb[1] * 255);
231 var b = Math.round(rgb[2] * 255);
232 return '#' + (r < 16 ? '0' : '') + r.toString(16) +
233 (g < 16 ? '0' : '') + g.toString(16) +
234 (b < 16 ? '0' : '') + b.toString(16);
237 fb.HSLToRGB = function (hsl) {
239 var h = hsl[0], s = hsl[1], l = hsl[2];
240 m2 = (l <= 0.5) ? l * (s + 1) : l + s - l*s;
242 return [this.hueToRGB(m1, m2, h+0.33333),
243 this.hueToRGB(m1, m2, h),
244 this.hueToRGB(m1, m2, h-0.33333)];
247 fb.hueToRGB = function (m1, m2, h) {
248 h = (h < 0) ? h + 1 : ((h > 1) ? h - 1 : h);
249 if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
250 if (h * 2 < 1) return m2;
251 if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;
255 fb.RGBToHSL = function (rgb) {
256 var min, max, delta, h, s, l;
257 var r = rgb[0], g = rgb[1], b = rgb[2];
258 min = Math.min(r, Math.min(g, b));
259 max = Math.max(r, Math.max(g, b));
263 if (l > 0 && l < 1) {
264 s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));
268 if (max == r && max != g) h += (g - b) / delta;
269 if (max == g && max != b) h += (2 + (b - r) / delta);
270 if (max == b && max != r) h += (4 + (r - g) / delta);
276 // Install mousedown handler (the others are set on the document on-demand)
277 $('*', e).mousedown(fb.mousedown);
280 fb.setColor('#000000');
282 // Set linked elements/callback