1 // $Id: farbtastic.js,v 1.4.2.1 2008/06/25 09:34:17 goba Exp $

     2 // Farbtastic 1.2

     3 

     4 jQuery.fn.farbtastic = function (callback) {

     5   $.farbtastic(this, callback);

     6   return this;

     7 };

     8 

     9 jQuery.farbtastic = function (container, callback) {

    10   var container = $(container).get(0);

    11   return container.farbtastic || (container.farbtastic = new jQuery._farbtastic(container, callback));

    12 };

    13 

    14 jQuery._farbtastic = function (container, callback) {

    15   // Store farbtastic object

    16   var fb = this;

    17 

    18   // Insert markup

    19   $(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>');

    20   var e = $('.farbtastic', container);

    21   fb.wheel = $('.wheel', container).get(0);

    22   // Dimensions

    23   fb.radius = 84;

    24   fb.square = 100;

    25   fb.width = 194;

    26 

    27   // Fix background PNGs in IE6

    28   if (navigator.appVersion.match(/MSIE [0-6]\./)) {

    29     $('*', e).each(function () {

    30       if (this.currentStyle.backgroundImage != 'none') {

    31         var image = this.currentStyle.backgroundImage;

    32         image = this.currentStyle.backgroundImage.substring(5, image.length - 2);

    33         $(this).css({

    34           'backgroundImage': 'none',

    35           'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src='" + image + "')"

    36         });

    37       }

    38     });

    39   }

    40 

    41   /**

    42    * Link to the given element(s) or callback.

    43    */

    44   fb.linkTo = function (callback) {

    45     // Unbind previous nodes

    46     if (typeof fb.callback == 'object') {

    47       $(fb.callback).unbind('keyup', fb.updateValue);

    48     }

    49 

    50     // Reset color

    51     fb.color = null;

    52 

    53     // Bind callback or elements

    54     if (typeof callback == 'function') {

    55       fb.callback = callback;

    56     }

    57     else if (typeof callback == 'object' || typeof callback == 'string') {

    58       fb.callback = $(callback);

    59       fb.callback.bind('keyup', fb.updateValue);

    60       if (fb.callback.get(0).value) {

    61         fb.setColor(fb.callback.get(0).value);

    62       }

    63     }

    64     return this;

    65   };

    66   fb.updateValue = function (event) {

    67     if (this.value && this.value != fb.color) {

    68       fb.setColor(this.value);

    69     }

    70   };

    71 

    72   /**

    73    * Change color with HTML syntax #123456

    74    */

    75   fb.setColor = function (color) {

    76     var unpack = fb.unpack(color);

    77     if (fb.color != color && unpack) {

    78       fb.color = color;

    79       fb.rgb = unpack;

    80       fb.hsl = fb.RGBToHSL(fb.rgb);

    81       fb.updateDisplay();

    82     }

    83     return this;

    84   };

    85 

    86   /**

    87    * Change color with HSL triplet [0..1, 0..1, 0..1]

    88    */

    89   fb.setHSL = function (hsl) {

    90     fb.hsl = hsl;

    91     fb.rgb = fb.HSLToRGB(hsl);

    92     fb.color = fb.pack(fb.rgb);

    93     fb.updateDisplay();

    94     return this;

    95   };

    96 

    97   /////////////////////////////////////////////////////

    98 

    99   /**

   100    * Retrieve the coordinates of the given event relative to the center

   101    * of the widget.

   102    */

   103   fb.widgetCoords = function (event) {

   104     var x, y;

   105     var el = event.target || event.srcElement;

   106     var reference = fb.wheel;

   107     

   108     // If the offset from the relative element is undefined calculate it.

   109     if ( typeof event.offsetX == 'undefined' && typeof event.offsetY == 'undefined' ) {

   110       var offset = $(event.target).offset(false);

   111       event.offsetX = event.pageX - offset.left;

   112       event.offsetY = event.pageY - offset.top;

   113     }

   114     

   115     // Use offset coordinates and find common offsetParent

   116     var pos = { x: event.offsetX, y: event.offsetY };

   117 

   118     // Send the coordinates upwards through the offsetParent chain.

   119     var e = el;

   120     while (e) {

   121       e.mouseX = pos.x;

   122       e.mouseY = pos.y;

   123       pos.x += e.offsetLeft;

   124       pos.y += e.offsetTop;

   125       e = e.offsetParent;

   126     }

   127 

   128     // Look for the coordinates starting from the wheel widget.

   129     var e = reference;

   130     var offset = { x: 0, y: 0 };

   131     while (e) {

   132       if (typeof e.mouseX != 'undefined') {

   133         x = e.mouseX - offset.x;

   134         y = e.mouseY - offset.y;

   135         break;

   136       }

   137       offset.x += e.offsetLeft;

   138       offset.y += e.offsetTop;

   139       e = e.offsetParent;

   140     }

   141 

   142     // Reset stored coordinates

   143     e = el;

   144     while (e) {

   145       e.mouseX = undefined;

   146       e.mouseY = undefined;

   147       e = e.offsetParent;

   148     }

   149 

   150     // Subtract distance to middle

   151     return { x: x - fb.width / 2, y: y - fb.width / 2 };

   152   };

   153 

   154   /**

   155    * Mousedown handler

   156    */

   157   fb.mousedown = function (event) {

   158     // Capture mouse

   159     if (!document.dragging) {

   160       $(document).bind('mousemove', fb.mousemove).bind('mouseup', fb.mouseup);

   161       document.dragging = true;

   162     }

   163 

   164     // Check which area is being dragged

   165     var pos = fb.widgetCoords(event);

   166     fb.circleDrag = Math.max(Math.abs(pos.x), Math.abs(pos.y)) * 2 > fb.square;

   167 

   168     // Process

   169     fb.mousemove(event);

   170     return false;

   171   };

   172 

   173   /**

   174    * Mousemove handler

   175    */

   176   fb.mousemove = function (event) {

   177     // Get coordinates relative to color picker center

   178     var pos = fb.widgetCoords(event);

   179 

   180     // Set new HSL parameters

   181     if (fb.circleDrag) {

   182       var hue = Math.atan2(pos.x, -pos.y) / 6.28;

   183       if (hue < 0) hue += 1;

   184       fb.setHSL([hue, fb.hsl[1], fb.hsl[2]]);

   185     }

   186     else {

   187       var sat = Math.max(0, Math.min(1, -(pos.x / fb.square) + .5));

   188       var lum = Math.max(0, Math.min(1, -(pos.y / fb.square) + .5));

   189       fb.setHSL([fb.hsl[0], sat, lum]);

   190     }

   191     return false;

   192   };

   193 

   194   /**

   195    * Mouseup handler

   196    */

   197   fb.mouseup = function () {

   198     // Uncapture mouse

   199     $(document).unbind('mousemove', fb.mousemove);

   200     $(document).unbind('mouseup', fb.mouseup);

   201     document.dragging = false;

   202   };

   203 

   204   /**

   205    * Update the markers and styles

   206    */

   207   fb.updateDisplay = function () {

   208     // Markers

   209     var angle = fb.hsl[0] * 6.28;

   210     $('.h-marker', e).css({

   211       left: Math.round(Math.sin(angle) * fb.radius + fb.width / 2) + 'px',

   212       top: Math.round(-Math.cos(angle) * fb.radius + fb.width / 2) + 'px'

   213     });

   214 

   215     $('.sl-marker', e).css({

   216       left: Math.round(fb.square * (.5 - fb.hsl[1]) + fb.width / 2) + 'px',

   217       top: Math.round(fb.square * (.5 - fb.hsl[2]) + fb.width / 2) + 'px'

   218     });

   219 

   220     // Saturation/Luminance gradient

   221     $('.color', e).css('backgroundColor', fb.pack(fb.HSLToRGB([fb.hsl[0], 1, 0.5])));

   222 

   223     // Linked elements or callback

   224     if (typeof fb.callback == 'object') {

   225       // Set background/foreground color

   226       $(fb.callback).css({

   227         backgroundColor: fb.color,

   228         color: fb.hsl[2] > 0.5 ? '#000' : '#fff'

   229       });

   230 

   231       // Change linked value

   232       $(fb.callback).each(function() {

   233         if (this.value && this.value != fb.color) {

   234           this.value = fb.color;

   235         }

   236       });

   237     }

   238     else if (typeof fb.callback == 'function') {

   239       fb.callback.call(fb, fb.color);

   240     }

   241   };

   242 

   243   /* Various color utility functions */

   244   fb.pack = function (rgb) {

   245     var r = Math.round(rgb[0] * 255);

   246     var g = Math.round(rgb[1] * 255);

   247     var b = Math.round(rgb[2] * 255);

   248     return '#' + (r < 16 ? '0' : '') + r.toString(16) +

   249            (g < 16 ? '0' : '') + g.toString(16) +

   250            (b < 16 ? '0' : '') + b.toString(16);

   251   };

   252 

   253   fb.unpack = function (color) {

   254     if (color.length == 7) {

   255       return [parseInt('0x' + color.substring(1, 3)) / 255,

   256         parseInt('0x' + color.substring(3, 5)) / 255,

   257         parseInt('0x' + color.substring(5, 7)) / 255];

   258     }

   259     else if (color.length == 4) {

   260       return [parseInt('0x' + color.substring(1, 2)) / 15,

   261         parseInt('0x' + color.substring(2, 3)) / 15,

   262         parseInt('0x' + color.substring(3, 4)) / 15];

   263     }

   264   };

   265 

   266   fb.HSLToRGB = function (hsl) {

   267     var m1, m2, r, g, b;

   268     var h = hsl[0], s = hsl[1], l = hsl[2];

   269     m2 = (l <= 0.5) ? l * (s + 1) : l + s - l*s;

   270     m1 = l * 2 - m2;

   271     return [this.hueToRGB(m1, m2, h+0.33333),

   272         this.hueToRGB(m1, m2, h),

   273         this.hueToRGB(m1, m2, h-0.33333)];

   274   };

   275 

   276   fb.hueToRGB = function (m1, m2, h) {

   277     h = (h < 0) ? h + 1 : ((h > 1) ? h - 1 : h);

   278     if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;

   279     if (h * 2 < 1) return m2;

   280     if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;

   281     return m1;

   282   };

   283 

   284   fb.RGBToHSL = function (rgb) {

   285     var min, max, delta, h, s, l;

   286     var r = rgb[0], g = rgb[1], b = rgb[2];

   287     min = Math.min(r, Math.min(g, b));

   288     max = Math.max(r, Math.max(g, b));

   289     delta = max - min;

   290     l = (min + max) / 2;

   291     s = 0;

   292     if (l > 0 && l < 1) {

   293       s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));

   294     }

   295     h = 0;

   296     if (delta > 0) {

   297       if (max == r && max != g) h += (g - b) / delta;

   298       if (max == g && max != b) h += (2 + (b - r) / delta);

   299       if (max == b && max != r) h += (4 + (r - g) / delta);

   300       h /= 6;

   301     }

   302     return [h, s, l];

   303   };

   304 

   305   // Install mousedown handler (the others are set on the document on-demand)

   306   $('*', e).mousedown(fb.mousedown);

   307 

   308     // Init color

   309   fb.setColor('#000000');

   310 

   311   // Set linked elements/callback

   312   if (callback) {

   313     fb.linkTo(callback);

   314   }

   315 };