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   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  };