https://road.chi-zu.net/farbtastic/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
20jQuery.fn.farbtastic = function (callback) {
21  $.farbtastic(this, callback);
22  return this;
23};
24
25jQuery.farbtastic = function (container, callback) {
26  var container = $(container).get(0);
27  return container.farbtastic || (container.farbtastic = new jQuery._farbtastic(container, callback));
28}
29
30jQuery._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}