Farbtastic

Farbtastic version for Rulesy's code

此脚本不应直接安装。它是供其他脚本使用的外部库,要使用该库请加入元指令 // @require https://update.cn-greasyfork.org/scripts/31200/204642/Farbtastic.js

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