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   1  // $Id: farbtastic.js,v 1.2 2007/01/08 22:53:01 unconed Exp $
   2  // Farbtastic 1.2
   3  
   4  var farbtastic_click = false;
   5  
   6  jQuery.fn.farbtastic = function (callback) {
   7    jQuery.farbtastic(this, callback);
   8    return this;
   9  };
  10  
  11  jQuery.farbtastic = function (container, callback) {
  12    var container = jQuery(container).get(0);
  13    return container.farbtastic || (container.farbtastic = new jQuery._farbtastic(container, callback));
  14  }
  15  
  16  jQuery._farbtastic = function (container, callback) {
  17    // Store farbtastic object
  18    var fb = this;
  19  
  20    // Insert markup
  21    jQuery(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>');
  22    var e = jQuery('.farbtastic', container);
  23    fb.wheel = jQuery('.wheel', container).get(0);
  24    // Dimensions
  25    fb.radius = 84;
  26    fb.square = 100;
  27    fb.width = 194;
  28  
  29    // Fix background PNGs in IE6
  30    if (navigator.appVersion.match(/MSIE [0-6]\./)) {
  31      jQuery('*', e).each(function () {
  32        if (this.currentStyle.backgroundImage != 'none') {
  33          var image = this.currentStyle.backgroundImage;
  34          image = this.currentStyle.backgroundImage.substring(5, image.length - 2);
  35          jQuery(this).css({
  36            'backgroundImage': 'none',
  37            'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src='" + image + "')"
  38          });
  39        }
  40      });
  41    }
  42  
  43    /**
  44     * Link to the given element(s) or callback.
  45     */
  46    fb.linkTo = function (callback) {
  47      // Unbind previous nodes
  48      if (typeof fb.callback == 'object') {
  49        jQuery(fb.callback).unbind('keyup', fb.updateValue);
  50      }
  51  
  52      // Reset color
  53      fb.color = null;
  54  
  55      // Bind callback or elements
  56      if (typeof callback == 'function') {
  57        fb.callback = callback;
  58      }
  59      else if (typeof callback == 'object' || typeof callback == 'string') {
  60        fb.callback = jQuery(callback);
  61        fb.callback.bind('keyup', fb.updateValue);
  62        if (fb.callback.get(0).value) {
  63          fb.setColor(fb.callback.get(0).value);
  64        }
  65      }
  66      return this;
  67    }
  68    fb.updateValue = function (event) {
  69      if (this.value && this.value != fb.color) {
  70        fb.setColor(this.value);
  71      }
  72    }
  73  
  74    /**
  75     * Change color with HTML syntax #123456
  76     */
  77    fb.setColor = function (color) {
  78      var unpack = fb.unpack(color);
  79      if (fb.color != color && unpack) {
  80        fb.color = color;
  81        fb.rgb = unpack;
  82        fb.hsl = fb.RGBToHSL(fb.rgb);
  83        fb.updateDisplay();
  84      }
  85      return this;
  86    }
  87  
  88    /**
  89     * Change color with HSL triplet [0..1, 0..1, 0..1]
  90     */
  91    fb.setHSL = function (hsl) {
  92      fb.hsl = hsl;
  93      fb.rgb = fb.HSLToRGB(hsl);
  94      fb.color = fb.pack(fb.rgb);
  95      fb.updateDisplay();
  96      return this;
  97    }
  98  
  99    /////////////////////////////////////////////////////
 100  
 101    /**
 102     * Retrieve the coordinates of the given event relative to the center
 103     * of the widget.
 104     */
 105    fb.widgetCoords = function (event) {
 106      var x, y;
 107      var el = event.target || event.srcElement;
 108      var reference = fb.wheel;
 109  
 110      if (typeof event.offsetX != 'undefined') {
 111        // Use offset coordinates and find common offsetParent
 112        var pos = { x: event.offsetX, y: event.offsetY };
 113  
 114        // Send the coordinates upwards through the offsetParent chain.
 115        var e = el;
 116        while (e) {
 117          e.mouseX = pos.x;
 118          e.mouseY = pos.y;
 119          pos.x += e.offsetLeft;
 120          pos.y += e.offsetTop;
 121          e = e.offsetParent;
 122        }
 123  
 124        // Look for the coordinates starting from the wheel widget.
 125        var e = reference;
 126        var offset = { x: 0, y: 0 }
 127        while (e) {
 128          if (typeof e.mouseX != 'undefined') {
 129            x = e.mouseX - offset.x;
 130            y = e.mouseY - offset.y;
 131            break;
 132          }
 133          offset.x += e.offsetLeft;
 134          offset.y += e.offsetTop;
 135          e = e.offsetParent;
 136        }
 137  
 138        // Reset stored coordinates
 139        e = el;
 140        while (e) {
 141          e.mouseX = undefined;
 142          e.mouseY = undefined;
 143          e = e.offsetParent;
 144        }
 145      }
 146      else {
 147        // Use absolute coordinates
 148        var pos = fb.absolutePosition(reference);
 149        x = (event.pageX || 0*(event.clientX + jQuery('html').get(0).scrollLeft)) - pos.x;
 150        y = (event.pageY || 0*(event.clientY + jQuery('html').get(0).scrollTop)) - pos.y;
 151      }
 152      // Subtract distance to middle
 153      return { x: x - fb.width / 2, y: y - fb.width / 2 };
 154    }
 155  
 156    /**
 157     * Mousedown handler
 158     */
 159    fb.mousedown = function (event) {
 160      farbtastic_click = true;
 161      // Capture mouse
 162      if (!document.dragging) {
 163        jQuery(document).bind('mousemove', fb.mousemove).bind('mouseup', fb.mouseup);
 164        document.dragging = true;
 165      }
 166  
 167      // Check which area is being dragged
 168      var pos = fb.widgetCoords(event);
 169      fb.circleDrag = Math.max(Math.abs(pos.x), Math.abs(pos.y)) * 2 > fb.square;
 170  
 171      // Process
 172      fb.mousemove(event);
 173      return false;
 174    }
 175  
 176    /**
 177     * Mousemove handler
 178     */
 179    fb.mousemove = function (event) {
 180      // Get coordinates relative to color picker center
 181      var pos = fb.widgetCoords(event);
 182  
 183      // Set new HSL parameters
 184      if (fb.circleDrag) {
 185        var hue = Math.atan2(pos.x, -pos.y) / 6.28;
 186        if (hue < 0) hue += 1;
 187        fb.setHSL([hue, fb.hsl[1], fb.hsl[2]]);
 188      }
 189      else {
 190        var sat = Math.max(0, Math.min(1, -(pos.x / fb.square) + .5));
 191        var lum = Math.max(0, Math.min(1, -(pos.y / fb.square) + .5));
 192        fb.setHSL([fb.hsl[0], sat, lum]);
 193      }
 194      return false;
 195    }
 196  
 197    /**
 198     * Mouseup handler
 199     */
 200    fb.mouseup = function () {
 201      // Uncapture mouse
 202      farbtastic_click = false;
 203      jQuery(document).unbind('mousemove', fb.mousemove);
 204      jQuery(document).unbind('mouseup', fb.mouseup);
 205      document.dragging = false;
 206    }
 207  
 208    /**
 209     * Update the markers and styles
 210     */
 211    fb.updateDisplay = function () {
 212      // Markers
 213      var angle = fb.hsl[0] * 6.28;
 214      jQuery('.h-marker', e).css({
 215        left: Math.round(Math.sin(angle) * fb.radius + fb.width / 2) + 'px',
 216        top: Math.round(-Math.cos(angle) * fb.radius + fb.width / 2) + 'px'
 217      });
 218  
 219      jQuery('.sl-marker', e).css({
 220        left: Math.round(fb.square * (.5 - fb.hsl[1]) + fb.width / 2) + 'px',
 221        top: Math.round(fb.square * (.5 - fb.hsl[2]) + fb.width / 2) + 'px'
 222      });
 223  
 224      // Saturation/Luminance gradient
 225      jQuery('.color', e).css('backgroundColor', fb.pack(fb.HSLToRGB([fb.hsl[0], 1, 0.5])));
 226  
 227      // Linked elements or callback
 228      if (typeof fb.callback == 'object') {
 229        // Set background/foreground color
 230        jQuery(fb.callback).css({
 231          backgroundColor: fb.color,
 232          color: fb.hsl[2] > 0.5 ? '#000' : '#fff'
 233        });
 234  
 235        // Change linked value
 236        jQuery(fb.callback).each(function() {
 237          if (this.value && this.value != fb.color) {
 238            this.value = fb.color;
 239          }
 240        });
 241      }
 242      else if (typeof fb.callback == 'function') {
 243        fb.callback.call(fb, fb.color);
 244      }
 245    }
 246  
 247    /**
 248     * Get absolute position of element
 249     */
 250    fb.absolutePosition = function (el) {
 251      var r = { x: el.offsetLeft, y: el.offsetTop };
 252      // Resolve relative to offsetParent
 253      if (el.offsetParent) {
 254        var tmp = fb.absolutePosition(el.offsetParent);
 255        r.x += tmp.x;
 256        r.y += tmp.y;
 257      }
 258      return r;
 259    };
 260  
 261    /* Various color utility functions */
 262    fb.pack = function (rgb) {
 263      var r = Math.round(rgb[0] * 255);
 264      var g = Math.round(rgb[1] * 255);
 265      var b = Math.round(rgb[2] * 255);
 266      return '#' + (r < 16 ? '0' : '') + r.toString(16) +
 267             (g < 16 ? '0' : '') + g.toString(16) +
 268             (b < 16 ? '0' : '') + b.toString(16);
 269    }
 270  
 271    fb.unpack = function (color) {
 272      if (color.length == 7) {
 273        return [parseInt('0x' + color.substring(1, 3)) / 255,
 274          parseInt('0x' + color.substring(3, 5)) / 255,
 275          parseInt('0x' + color.substring(5, 7)) / 255];
 276      }
 277      else if (color.length == 4) {
 278        return [parseInt('0x' + color.substring(1, 2)) / 15,
 279          parseInt('0x' + color.substring(2, 3)) / 15,
 280          parseInt('0x' + color.substring(3, 4)) / 15];
 281      }
 282    }
 283  
 284    fb.HSLToRGB = function (hsl) {
 285      var m1, m2, r, g, b;
 286      var h = hsl[0], s = hsl[1], l = hsl[2];
 287      m2 = (l <= 0.5) ? l * (s + 1) : l + s - l*s;
 288      m1 = l * 2 - m2;
 289      return [this.hueToRGB(m1, m2, h+0.33333),
 290          this.hueToRGB(m1, m2, h),
 291          this.hueToRGB(m1, m2, h-0.33333)];
 292    }
 293  
 294    fb.hueToRGB = function (m1, m2, h) {
 295      h = (h < 0) ? h + 1 : ((h > 1) ? h - 1 : h);
 296      if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
 297      if (h * 2 < 1) return m2;
 298      if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;
 299      return m1;
 300    }
 301  
 302    fb.RGBToHSL = function (rgb) {
 303      var min, max, delta, h, s, l;
 304      var r = rgb[0], g = rgb[1], b = rgb[2];
 305      min = Math.min(r, Math.min(g, b));
 306      max = Math.max(r, Math.max(g, b));
 307      delta = max - min;
 308      l = (min + max) / 2;
 309      s = 0;
 310      if (l > 0 && l < 1) {
 311        s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));
 312      }
 313      h = 0;
 314      if (delta > 0) {
 315        if (max == r && max != g) h += (g - b) / delta;
 316        if (max == g && max != b) h += (2 + (b - r) / delta);
 317        if (max == b && max != r) h += (4 + (r - g) / delta);
 318        h /= 6;
 319      }
 320      return [h, s, l];
 321    }
 322  
 323    // Install mousedown handler (the others are set on the document on-demand)
 324    jQuery('*', e).mousedown(fb.mousedown);
 325  
 326      // Init color
 327    fb.setColor('#000000');
 328  
 329    // Set linked elements/callback
 330    if (callback) {
 331      fb.linkTo(callback);
 332    }
 333  }