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   1  /*!
   2   * Farbtastic: jQuery color picker plug-in v1.3u
   3   *
   4   * Licensed under the GPL license:
   5   *   http://www.gnu.org/licenses/gpl.html
   6   */
   7  (function($) {
   8  
   9  $.fn.farbtastic = function (options) {
  10    $.farbtastic(this, options);
  11    return this;
  12  };
  13  
  14  $.farbtastic = function (container, callback) {
  15    var container = $(container).get(0);
  16    return container.farbtastic || (container.farbtastic = new $._farbtastic(container, callback));
  17  };
  18  
  19  $._farbtastic = function (container, callback) {
  20    // Store farbtastic object
  21    var fb = this;
  22  
  23    // Insert markup
  24    $(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>');
  25    var e = $('.farbtastic', container);
  26    fb.wheel = $('.wheel', container).get(0);
  27    // Dimensions
  28    fb.radius = 84;
  29    fb.square = 100;
  30    fb.width = 194;
  31  
  32    // Fix background PNGs in IE6
  33    if (navigator.appVersion.match(/MSIE [0-6]\./)) {
  34      $('*', e).each(function () {
  35        if (this.currentStyle.backgroundImage != 'none') {
  36          var image = this.currentStyle.backgroundImage;
  37          image = this.currentStyle.backgroundImage.substring(5, image.length - 2);
  38          $(this).css({
  39            'backgroundImage': 'none',
  40            'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src='" + image + "')"
  41          });
  42        }
  43      });
  44    }
  45  
  46    /**
  47     * Link to the given element(s) or callback.
  48     */
  49    fb.linkTo = function (callback) {
  50      // Unbind previous nodes
  51      if (typeof fb.callback == 'object') {
  52        $(fb.callback).unbind('keyup', fb.updateValue);
  53      }
  54  
  55      // Reset color
  56      fb.color = null;
  57  
  58      // Bind callback or elements
  59      if (typeof callback == 'function') {
  60        fb.callback = callback;
  61      }
  62      else if (typeof callback == 'object' || typeof callback == 'string') {
  63        fb.callback = $(callback);
  64        fb.callback.bind('keyup', fb.updateValue);
  65        if (fb.callback.get(0).value) {
  66          fb.setColor(fb.callback.get(0).value);
  67        }
  68      }
  69      return this;
  70    };
  71    fb.updateValue = function (event) {
  72      if (this.value && this.value != fb.color) {
  73        fb.setColor(this.value);
  74      }
  75    };
  76  
  77    /**
  78     * Change color with HTML syntax #123456
  79     */
  80    fb.setColor = function (color) {
  81      var unpack = fb.unpack(color);
  82      if (fb.color != color && unpack) {
  83        fb.color = color;
  84        fb.rgb = unpack;
  85        fb.hsl = fb.RGBToHSL(fb.rgb);
  86        fb.updateDisplay();
  87      }
  88      return this;
  89    };
  90  
  91    /**
  92     * Change color with HSL triplet [0..1, 0..1, 0..1]
  93     */
  94    fb.setHSL = function (hsl) {
  95      fb.hsl = hsl;
  96      fb.rgb = fb.HSLToRGB(hsl);
  97      fb.color = fb.pack(fb.rgb);
  98      fb.updateDisplay();
  99      return this;
 100    };
 101  
 102    /////////////////////////////////////////////////////
 103  
 104    /**
 105     * Retrieve the coordinates of the given event relative to the center
 106     * of the widget.
 107     */
 108    fb.widgetCoords = function (event) {
 109      var offset = $(fb.wheel).offset();
 110      return { x: (event.pageX - offset.left) - fb.width / 2, y: (event.pageY - offset.top) - fb.width / 2 };
 111    };
 112  
 113    /**
 114     * Mousedown handler
 115     */
 116    fb.mousedown = function (event) {
 117      // Capture mouse
 118      if (!document.dragging) {
 119        $(document).bind('mousemove', fb.mousemove).bind('mouseup', fb.mouseup);
 120        document.dragging = true;
 121      }
 122  
 123      // Check which area is being dragged
 124      var pos = fb.widgetCoords(event);
 125      fb.circleDrag = Math.max(Math.abs(pos.x), Math.abs(pos.y)) * 2 > fb.square;
 126  
 127      // Process
 128      fb.mousemove(event);
 129      return false;
 130    };
 131  
 132    /**
 133     * Mousemove handler
 134     */
 135    fb.mousemove = function (event) {
 136      // Get coordinates relative to color picker center
 137      var pos = fb.widgetCoords(event);
 138  
 139      // Set new HSL parameters
 140      if (fb.circleDrag) {
 141        var hue = Math.atan2(pos.x, -pos.y) / 6.28;
 142        if (hue < 0) hue += 1;
 143        fb.setHSL([hue, fb.hsl[1], fb.hsl[2]]);
 144      }
 145      else {
 146        var sat = Math.max(0, Math.min(1, -(pos.x / fb.square) + .5));
 147        var lum = Math.max(0, Math.min(1, -(pos.y / fb.square) + .5));
 148        fb.setHSL([fb.hsl[0], sat, lum]);
 149      }
 150      return false;
 151    };
 152  
 153    /**
 154     * Mouseup handler
 155     */
 156    fb.mouseup = function () {
 157      // Uncapture mouse
 158      $(document).unbind('mousemove', fb.mousemove);
 159      $(document).unbind('mouseup', fb.mouseup);
 160      document.dragging = false;
 161    };
 162  
 163    /**
 164     * Update the markers and styles
 165     */
 166    fb.updateDisplay = function () {
 167      // Markers
 168      var angle = fb.hsl[0] * 6.28;
 169      $('.h-marker', e).css({
 170        left: Math.round(Math.sin(angle) * fb.radius + fb.width / 2) + 'px',
 171        top: Math.round(-Math.cos(angle) * fb.radius + fb.width / 2) + 'px'
 172      });
 173  
 174      $('.sl-marker', e).css({
 175        left: Math.round(fb.square * (.5 - fb.hsl[1]) + fb.width / 2) + 'px',
 176        top: Math.round(fb.square * (.5 - fb.hsl[2]) + fb.width / 2) + 'px'
 177      });
 178  
 179      // Saturation/Luminance gradient
 180      $('.color', e).css('backgroundColor', fb.pack(fb.HSLToRGB([fb.hsl[0], 1, 0.5])));
 181  
 182      // Linked elements or callback
 183      if (typeof fb.callback == 'object') {
 184        // Set background/foreground color
 185        $(fb.callback).css({
 186          backgroundColor: fb.color,
 187          color: fb.hsl[2] > 0.5 ? '#000' : '#fff'
 188        });
 189  
 190        // Change linked value
 191        $(fb.callback).each(function() {
 192          if (this.value && this.value != fb.color) {
 193            this.value = fb.color;
 194          }
 195        });
 196      }
 197      else if (typeof fb.callback == 'function') {
 198        fb.callback.call(fb, fb.color);
 199      }
 200    };
 201  
 202    /* Various color utility functions */
 203    fb.pack = function (rgb) {
 204      var r = Math.round(rgb[0] * 255);
 205      var g = Math.round(rgb[1] * 255);
 206      var b = Math.round(rgb[2] * 255);
 207      return '#' + (r < 16 ? '0' : '') + r.toString(16) +
 208             (g < 16 ? '0' : '') + g.toString(16) +
 209             (b < 16 ? '0' : '') + b.toString(16);
 210    };
 211  
 212    fb.unpack = function (color) {
 213      if (color.length == 7) {
 214        return [parseInt('0x' + color.substring(1, 3)) / 255,
 215          parseInt('0x' + color.substring(3, 5)) / 255,
 216          parseInt('0x' + color.substring(5, 7)) / 255];
 217      }
 218      else if (color.length == 4) {
 219        return [parseInt('0x' + color.substring(1, 2)) / 15,
 220          parseInt('0x' + color.substring(2, 3)) / 15,
 221          parseInt('0x' + color.substring(3, 4)) / 15];
 222      }
 223    };
 224  
 225    fb.HSLToRGB = function (hsl) {
 226      var m1, m2, r, g, b;
 227      var h = hsl[0], s = hsl[1], l = hsl[2];
 228      m2 = (l <= 0.5) ? l * (s + 1) : l + s - l*s;
 229      m1 = l * 2 - m2;
 230      return [this.hueToRGB(m1, m2, h+0.33333),
 231          this.hueToRGB(m1, m2, h),
 232          this.hueToRGB(m1, m2, h-0.33333)];
 233    };
 234  
 235    fb.hueToRGB = function (m1, m2, h) {
 236      h = (h < 0) ? h + 1 : ((h > 1) ? h - 1 : h);
 237      if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
 238      if (h * 2 < 1) return m2;
 239      if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;
 240      return m1;
 241    };
 242  
 243    fb.RGBToHSL = function (rgb) {
 244      var min, max, delta, h, s, l;
 245      var r = rgb[0], g = rgb[1], b = rgb[2];
 246      min = Math.min(r, Math.min(g, b));
 247      max = Math.max(r, Math.max(g, b));
 248      delta = max - min;
 249      l = (min + max) / 2;
 250      s = 0;
 251      if (l > 0 && l < 1) {
 252        s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));
 253      }
 254      h = 0;
 255      if (delta > 0) {
 256        if (max == r && max != g) h += (g - b) / delta;
 257        if (max == g && max != b) h += (2 + (b - r) / delta);
 258        if (max == b && max != r) h += (4 + (r - g) / delta);
 259        h /= 6;
 260      }
 261      return [h, s, l];
 262    };
 263  
 264    // Install mousedown handler (the others are set on the document on-demand)
 265    $('*', e).mousedown(fb.mousedown);
 266  
 267      // Init color
 268    fb.setColor('#000000');
 269  
 270    // Set linked elements/callback
 271    if (callback) {
 272      fb.linkTo(callback);
 273    }
 274  };
 275  
 276  })(jQuery);