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1/**
2 * Farbtastic Color Picker 1.2
3 * © 2008 Steven Wittens
4 *
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.
9 *
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.
14 *
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
18 */
19
20(function ($){
21jQuery.fn.farbtastic = function (callback) {
22 $.farbtastic(this, callback);
23 return this;
24};
25
26jQuery.farbtastic = function (container, callback) {
27 var container = $(container).get(0);
28 return container.farbtastic || (container.farbtastic = new jQuery._farbtastic(container, callback));
29}
30
31jQuery._farbtastic = function (container, callback) {
32 // Store farbtastic object
33 var fb = this;
34
35 // Insert markup
36 $(container).html('<div class="farbtastic"><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>');
37 var e = $('.farbtastic', container);
38 fb.wheel = $('.wheel', container).get(0);
39 // Dimensions
40 fb.radius = 84;
41 fb.square = 100;
42 fb.width = 194;
43
44 // Fix background PNGs in IE6
45 if (navigator.appVersion.match(/MSIE [0-6]\./)) {
46 $('*', e).each(function () {
47 if (this.currentStyle.backgroundImage != 'none') {
48 var image = this.currentStyle.backgroundImage;
49 image = this.currentStyle.backgroundImage.substring(5, image.length - 2);
50 $(this).css({
51 'backgroundImage': 'none',
52 'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src='" + image + "')"
53 });
54 }
55 });
56 }
57
58 /**
59 * Link to the given element(s) or callback.
60 */
61 fb.linkTo = function (callback) {
62 // Unbind previous nodes
63 if (typeof fb.callback == 'object') {
64 $(fb.callback).unbind('keyup', fb.updateValue);
65 }
66
67 // Reset color
68 fb.color = null;
69
70 // Bind callback or elements
71 if (typeof callback == 'function') {
72 fb.callback = callback;
73 }
74 else if (typeof callback == 'object' || typeof callback == 'string') {
75 fb.callback = $(callback);
76 fb.callback.bind('keyup', fb.updateValue);
77 if (fb.callback.get(0).value) {
78 fb.setColor(fb.callback.get(0).value);
79 }
80 }
81 return this;
82 }
83 fb.updateValue = function (event) {
84 if (this.value && this.value != fb.color) {
85 fb.setColor(this.value);
86 }
87 }
88
89 /**
90 * Change color with HTML syntax #123456
91 */
92 fb.setColor = function (color) {
93 var unpack = fb.unpack(color);
94 if (fb.color != color && unpack) {
95 fb.color = color;
96 fb.rgb = unpack;
97 fb.hsl = fb.RGBToHSL(fb.rgb);
98 fb.updateDisplay();
99 }
100 return this;
101 }
102
103 /**
104 * Change color with HSL triplet [0..1, 0..1, 0..1]
105 */
106 fb.setHSL = function (hsl) {
107 fb.hsl = hsl;
108 fb.rgb = fb.HSLToRGB(hsl);
109 fb.color = fb.pack(fb.rgb);
110 fb.updateDisplay();
111 return this;
112 }
113
114 /////////////////////////////////////////////////////
115
116 /**
117 * Retrieve the coordinates of the given event relative to the center
118 * of the widget.
119 */
120 fb.widgetCoords = function (event) {
121 var x, y;
122 var el = event.target || event.srcElement;
123 var reference = fb.wheel;
124
125 if (typeof event.offsetX != 'undefined') {
126 // Use offset coordinates and find common offsetParent
127 var pos = { x: event.offsetX, y: event.offsetY };
128
129 // Send the coordinates upwards through the offsetParent chain.
130 var e = el;
131 while (e) {
132 e.mouseX = pos.x;
133 e.mouseY = pos.y;
134 pos.x += e.offsetLeft;
135 pos.y += e.offsetTop;
136 e = e.offsetParent;
137 }
138
139 // Look for the coordinates starting from the wheel widget.
140 var e = reference;
141 var offset = { x: 0, y: 0 }
142 while (e) {
143 if (typeof e.mouseX != 'undefined') {
144 x = e.mouseX - offset.x;
145 y = e.mouseY - offset.y;
146 break;
147 }
148 offset.x += e.offsetLeft;
149 offset.y += e.offsetTop;
150 e = e.offsetParent;
151 }
152
153 // Reset stored coordinates
154 e = el;
155 while (e) {
156 e.mouseX = undefined;
157 e.mouseY = undefined;
158 e = e.offsetParent;
159 }
160 }
161 else {
162 // Use absolute coordinates
163 var pos = fb.absolutePosition(reference);
164 x = (event.pageX || 0*(event.clientX + $('html').get(0).scrollLeft)) - pos.x;
165 y = (event.pageY || 0*(event.clientY + $('html').get(0).scrollTop)) - pos.y;
166 }
167 // Subtract distance to middle
168 return { x: x - fb.width / 2, y: y - fb.width / 2 };
169 }
170
171 /**
172 * Mousedown handler
173 */
174 fb.mousedown = function (event) {
175 // Capture mouse
176 if (!document.dragging) {
177 $(document).bind('mousemove', fb.mousemove).bind('mouseup', fb.mouseup);
178 document.dragging = true;
179 }
180
181 // Check which area is being dragged
182 var pos = fb.widgetCoords(event);
183 fb.circleDrag = Math.max(Math.abs(pos.x), Math.abs(pos.y)) * 2 > fb.square;
184
185 // Process
186 fb.mousemove(event);
187 return false;
188 }
189
190 /**
191 * Mousemove handler
192 */
193 fb.mousemove = function (event) {
194 // Get coordinates relative to color picker center
195 var pos = fb.widgetCoords(event);
196
197 // Set new HSL parameters
198 if (fb.circleDrag) {
199 var hue = Math.atan2(pos.x, -pos.y) / 6.28;
200 if (hue < 0) hue += 1;
201 fb.setHSL([hue, fb.hsl[1], fb.hsl[2]]);
202 }
203 else {
204 var sat = Math.max(0, Math.min(1, -(pos.x / fb.square) + .5));
205 var lum = Math.max(0, Math.min(1, -(pos.y / fb.square) + .5));
206 fb.setHSL([fb.hsl[0], sat, lum]);
207 }
208 return false;
209 }
210
211 /**
212 * Mouseup handler
213 */
214 fb.mouseup = function () {
215 // Uncapture mouse
216 $(document).unbind('mousemove', fb.mousemove);
217 $(document).unbind('mouseup', fb.mouseup);
218 document.dragging = false;
219 }
220
221 /**
222 * Update the markers and styles
223 */
224 fb.updateDisplay = function () {
225 // Markers
226 var angle = fb.hsl[0] * 6.28;
227 $('.h-marker', e).css({
228 left: Math.round(Math.sin(angle) * fb.radius + fb.width / 2) + 'px',
229 top: Math.round(-Math.cos(angle) * fb.radius + fb.width / 2) + 'px'
230 });
231
232 $('.sl-marker', e).css({
233 left: Math.round(fb.square * (.5 - fb.hsl[1]) + fb.width / 2) + 'px',
234 top: Math.round(fb.square * (.5 - fb.hsl[2]) + fb.width / 2) + 'px'
235 });
236
237 // Saturation/Luminance gradient
238 $('.color', e).css('backgroundColor', fb.pack(fb.HSLToRGB([fb.hsl[0], 1, 0.5])));
239
240 // Linked elements or callback
241 if (typeof fb.callback == 'object') {
242 // Set background/foreground color
243 $(fb.callback).css({
244 backgroundColor: fb.color,
245 color: fb.hsl[2] > 0.5 ? '#000' : '#fff'
246 });
247
248 // Change linked value
249 $(fb.callback).each(function() {
250 if (this.value && this.value != fb.color) {
251 this.value = fb.color;
252 }
253 });
254 }
255 else if (typeof fb.callback == 'function') {
256 fb.callback.call(fb, fb.color);
257 }
258 }
259
260 /**
261 * Get absolute position of element
262 */
263 fb.absolutePosition = function (el) {
264 var r = { x: el.offsetLeft, y: el.offsetTop };
265 // Resolve relative to offsetParent
266 if (el.offsetParent) {
267 var tmp = fb.absolutePosition(el.offsetParent);
268 r.x += tmp.x;
269 r.y += tmp.y;
270 }
271 return r;
272 };
273
274 /* Various color utility functions */
275 fb.pack = function (rgb) {
276 var r = Math.round(rgb[0] * 255);
277 var g = Math.round(rgb[1] * 255);
278 var b = Math.round(rgb[2] * 255);
279 return '#' + (r < 16 ? '0' : '') + r.toString(16) +
280 (g < 16 ? '0' : '') + g.toString(16) +
281 (b < 16 ? '0' : '') + b.toString(16);
282 }
283
284 fb.unpack = function (color) {
285 if (color.length == 7) {
286 return [parseInt('0x' + color.substring(1, 3)) / 255,
287 parseInt('0x' + color.substring(3, 5)) / 255,
288 parseInt('0x' + color.substring(5, 7)) / 255];
289 }
290 else if (color.length == 4) {
291 return [parseInt('0x' + color.substring(1, 2)) / 15,
292 parseInt('0x' + color.substring(2, 3)) / 15,
293 parseInt('0x' + color.substring(3, 4)) / 15];
294 }
295 }
296
297 fb.HSLToRGB = function (hsl) {
298 var m1, m2, r, g, b;
299 var h = hsl[0], s = hsl[1], l = hsl[2];
300 m2 = (l <= 0.5) ? l * (s + 1) : l + s - l*s;
301 m1 = l * 2 - m2;
302 return [this.hueToRGB(m1, m2, h+0.33333),
303 this.hueToRGB(m1, m2, h),
304 this.hueToRGB(m1, m2, h-0.33333)];
305 }
306
307 fb.hueToRGB = function (m1, m2, h) {
308 h = (h < 0) ? h + 1 : ((h > 1) ? h - 1 : h);
309 if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
310 if (h * 2 < 1) return m2;
311 if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;
312 return m1;
313 }
314
315 fb.RGBToHSL = function (rgb) {
316 var min, max, delta, h, s, l;
317 var r = rgb[0], g = rgb[1], b = rgb[2];
318 min = Math.min(r, Math.min(g, b));
319 max = Math.max(r, Math.max(g, b));
320 delta = max - min;
321 l = (min + max) / 2;
322 s = 0;
323 if (l > 0 && l < 1) {
324 s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));
325 }
326 h = 0;
327 if (delta > 0) {
328 if (max == r && max != g) h += (g - b) / delta;
329 if (max == g && max != b) h += (2 + (b - r) / delta);
330 if (max == b && max != r) h += (4 + (r - g) / delta);
331 h /= 6;
332 }
333 return [h, s, l];
334 }
335
336 // Install mousedown handler (the others are set on the document on-demand)
337 $('*', e).mousedown(fb.mousedown);
338
339 // Init color
340 fb.setColor('#000000');
341
342 // Set linked elements/callback
343 if (callback) {
344 fb.linkTo(callback);
345 }
346}
347})(jQuery);