webmaster@1: // $Id: farbtastic.js,v 1.4 2007/06/01 09:05:45 unconed Exp $
webmaster@1: // Farbtastic 1.2
webmaster@1: 
webmaster@1: jQuery.fn.farbtastic = function (callback) {
webmaster@1:   $.farbtastic(this, callback);
webmaster@1:   return this;
webmaster@1: };
webmaster@1: 
webmaster@1: jQuery.farbtastic = function (container, callback) {
webmaster@1:   var container = $(container).get(0);
webmaster@1:   return container.farbtastic || (container.farbtastic = new jQuery._farbtastic(container, callback));
webmaster@1: };
webmaster@1: 
webmaster@1: jQuery._farbtastic = function (container, callback) {
webmaster@1:   // Store farbtastic object
webmaster@1:   var fb = this;
webmaster@1: 
webmaster@1:   // Insert markup
webmaster@1:   $(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>');
webmaster@1:   var e = $('.farbtastic', container);
webmaster@1:   fb.wheel = $('.wheel', container).get(0);
webmaster@1:   // Dimensions
webmaster@1:   fb.radius = 84;
webmaster@1:   fb.square = 100;
webmaster@1:   fb.width = 194;
webmaster@1: 
webmaster@1:   // Fix background PNGs in IE6
webmaster@1:   if (navigator.appVersion.match(/MSIE [0-6]\./)) {
webmaster@1:     $('*', e).each(function () {
webmaster@1:       if (this.currentStyle.backgroundImage != 'none') {
webmaster@1:         var image = this.currentStyle.backgroundImage;
webmaster@1:         image = this.currentStyle.backgroundImage.substring(5, image.length - 2);
webmaster@1:         $(this).css({
webmaster@1:           'backgroundImage': 'none',
webmaster@1:           'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src='" + image + "')"
webmaster@1:         });
webmaster@1:       }
webmaster@1:     });
webmaster@1:   }
webmaster@1: 
webmaster@1:   /**
webmaster@1:    * Link to the given element(s) or callback.
webmaster@1:    */
webmaster@1:   fb.linkTo = function (callback) {
webmaster@1:     // Unbind previous nodes
webmaster@1:     if (typeof fb.callback == 'object') {
webmaster@1:       $(fb.callback).unbind('keyup', fb.updateValue);
webmaster@1:     }
webmaster@1: 
webmaster@1:     // Reset color
webmaster@1:     fb.color = null;
webmaster@1: 
webmaster@1:     // Bind callback or elements
webmaster@1:     if (typeof callback == 'function') {
webmaster@1:       fb.callback = callback;
webmaster@1:     }
webmaster@1:     else if (typeof callback == 'object' || typeof callback == 'string') {
webmaster@1:       fb.callback = $(callback);
webmaster@1:       fb.callback.bind('keyup', fb.updateValue);
webmaster@1:       if (fb.callback.get(0).value) {
webmaster@1:         fb.setColor(fb.callback.get(0).value);
webmaster@1:       }
webmaster@1:     }
webmaster@1:     return this;
webmaster@1:   };
webmaster@1:   fb.updateValue = function (event) {
webmaster@1:     if (this.value && this.value != fb.color) {
webmaster@1:       fb.setColor(this.value);
webmaster@1:     }
webmaster@1:   };
webmaster@1: 
webmaster@1:   /**
webmaster@1:    * Change color with HTML syntax #123456
webmaster@1:    */
webmaster@1:   fb.setColor = function (color) {
webmaster@1:     var unpack = fb.unpack(color);
webmaster@1:     if (fb.color != color && unpack) {
webmaster@1:       fb.color = color;
webmaster@1:       fb.rgb = unpack;
webmaster@1:       fb.hsl = fb.RGBToHSL(fb.rgb);
webmaster@1:       fb.updateDisplay();
webmaster@1:     }
webmaster@1:     return this;
webmaster@1:   };
webmaster@1: 
webmaster@1:   /**
webmaster@1:    * Change color with HSL triplet [0..1, 0..1, 0..1]
webmaster@1:    */
webmaster@1:   fb.setHSL = function (hsl) {
webmaster@1:     fb.hsl = hsl;
webmaster@1:     fb.rgb = fb.HSLToRGB(hsl);
webmaster@1:     fb.color = fb.pack(fb.rgb);
webmaster@1:     fb.updateDisplay();
webmaster@1:     return this;
webmaster@1:   };
webmaster@1: 
webmaster@1:   /////////////////////////////////////////////////////
webmaster@1: 
webmaster@1:   /**
webmaster@1:    * Retrieve the coordinates of the given event relative to the center
webmaster@1:    * of the widget.
webmaster@1:    */
webmaster@1:   fb.widgetCoords = function (event) {
webmaster@1:     var x, y;
webmaster@1:     var el = event.target || event.srcElement;
webmaster@1:     var reference = fb.wheel;
webmaster@1: 
webmaster@1:     if (typeof event.offsetX != 'undefined') {
webmaster@1:       // Use offset coordinates and find common offsetParent
webmaster@1:       var pos = { x: event.offsetX, y: event.offsetY };
webmaster@1: 
webmaster@1:       // Send the coordinates upwards through the offsetParent chain.
webmaster@1:       var e = el;
webmaster@1:       while (e) {
webmaster@1:         e.mouseX = pos.x;
webmaster@1:         e.mouseY = pos.y;
webmaster@1:         pos.x += e.offsetLeft;
webmaster@1:         pos.y += e.offsetTop;
webmaster@1:         e = e.offsetParent;
webmaster@1:       }
webmaster@1: 
webmaster@1:       // Look for the coordinates starting from the wheel widget.
webmaster@1:       var e = reference;
webmaster@1:       var offset = { x: 0, y: 0 };
webmaster@1:       while (e) {
webmaster@1:         if (typeof e.mouseX != 'undefined') {
webmaster@1:           x = e.mouseX - offset.x;
webmaster@1:           y = e.mouseY - offset.y;
webmaster@1:           break;
webmaster@1:         }
webmaster@1:         offset.x += e.offsetLeft;
webmaster@1:         offset.y += e.offsetTop;
webmaster@1:         e = e.offsetParent;
webmaster@1:       }
webmaster@1: 
webmaster@1:       // Reset stored coordinates
webmaster@1:       e = el;
webmaster@1:       while (e) {
webmaster@1:         e.mouseX = undefined;
webmaster@1:         e.mouseY = undefined;
webmaster@1:         e = e.offsetParent;
webmaster@1:       }
webmaster@1:     }
webmaster@1:     else {
webmaster@1:       // Use absolute coordinates
webmaster@1:       var pos = fb.absolutePosition(reference);
webmaster@1:       x = (event.pageX || 0*(event.clientX + $('html').get(0).scrollLeft)) - pos.x;
webmaster@1:       y = (event.pageY || 0*(event.clientY + $('html').get(0).scrollTop)) - pos.y;
webmaster@1:     }
webmaster@1:     // Subtract distance to middle
webmaster@1:     return { x: x - fb.width / 2, y: y - fb.width / 2 };
webmaster@1:   };
webmaster@1: 
webmaster@1:   /**
webmaster@1:    * Mousedown handler
webmaster@1:    */
webmaster@1:   fb.mousedown = function (event) {
webmaster@1:     // Capture mouse
webmaster@1:     if (!document.dragging) {
webmaster@1:       $(document).bind('mousemove', fb.mousemove).bind('mouseup', fb.mouseup);
webmaster@1:       document.dragging = true;
webmaster@1:     }
webmaster@1: 
webmaster@1:     // Check which area is being dragged
webmaster@1:     var pos = fb.widgetCoords(event);
webmaster@1:     fb.circleDrag = Math.max(Math.abs(pos.x), Math.abs(pos.y)) * 2 > fb.square;
webmaster@1: 
webmaster@1:     // Process
webmaster@1:     fb.mousemove(event);
webmaster@1:     return false;
webmaster@1:   };
webmaster@1: 
webmaster@1:   /**
webmaster@1:    * Mousemove handler
webmaster@1:    */
webmaster@1:   fb.mousemove = function (event) {
webmaster@1:     // Get coordinates relative to color picker center
webmaster@1:     var pos = fb.widgetCoords(event);
webmaster@1: 
webmaster@1:     // Set new HSL parameters
webmaster@1:     if (fb.circleDrag) {
webmaster@1:       var hue = Math.atan2(pos.x, -pos.y) / 6.28;
webmaster@1:       if (hue < 0) hue += 1;
webmaster@1:       fb.setHSL([hue, fb.hsl[1], fb.hsl[2]]);
webmaster@1:     }
webmaster@1:     else {
webmaster@1:       var sat = Math.max(0, Math.min(1, -(pos.x / fb.square) + .5));
webmaster@1:       var lum = Math.max(0, Math.min(1, -(pos.y / fb.square) + .5));
webmaster@1:       fb.setHSL([fb.hsl[0], sat, lum]);
webmaster@1:     }
webmaster@1:     return false;
webmaster@1:   };
webmaster@1: 
webmaster@1:   /**
webmaster@1:    * Mouseup handler
webmaster@1:    */
webmaster@1:   fb.mouseup = function () {
webmaster@1:     // Uncapture mouse
webmaster@1:     $(document).unbind('mousemove', fb.mousemove);
webmaster@1:     $(document).unbind('mouseup', fb.mouseup);
webmaster@1:     document.dragging = false;
webmaster@1:   };
webmaster@1: 
webmaster@1:   /**
webmaster@1:    * Update the markers and styles
webmaster@1:    */
webmaster@1:   fb.updateDisplay = function () {
webmaster@1:     // Markers
webmaster@1:     var angle = fb.hsl[0] * 6.28;
webmaster@1:     $('.h-marker', e).css({
webmaster@1:       left: Math.round(Math.sin(angle) * fb.radius + fb.width / 2) + 'px',
webmaster@1:       top: Math.round(-Math.cos(angle) * fb.radius + fb.width / 2) + 'px'
webmaster@1:     });
webmaster@1: 
webmaster@1:     $('.sl-marker', e).css({
webmaster@1:       left: Math.round(fb.square * (.5 - fb.hsl[1]) + fb.width / 2) + 'px',
webmaster@1:       top: Math.round(fb.square * (.5 - fb.hsl[2]) + fb.width / 2) + 'px'
webmaster@1:     });
webmaster@1: 
webmaster@1:     // Saturation/Luminance gradient
webmaster@1:     $('.color', e).css('backgroundColor', fb.pack(fb.HSLToRGB([fb.hsl[0], 1, 0.5])));
webmaster@1: 
webmaster@1:     // Linked elements or callback
webmaster@1:     if (typeof fb.callback == 'object') {
webmaster@1:       // Set background/foreground color
webmaster@1:       $(fb.callback).css({
webmaster@1:         backgroundColor: fb.color,
webmaster@1:         color: fb.hsl[2] > 0.5 ? '#000' : '#fff'
webmaster@1:       });
webmaster@1: 
webmaster@1:       // Change linked value
webmaster@1:       $(fb.callback).each(function() {
webmaster@1:         if (this.value && this.value != fb.color) {
webmaster@1:           this.value = fb.color;
webmaster@1:         }
webmaster@1:       });
webmaster@1:     }
webmaster@1:     else if (typeof fb.callback == 'function') {
webmaster@1:       fb.callback.call(fb, fb.color);
webmaster@1:     }
webmaster@1:   };
webmaster@1: 
webmaster@1:   /**
webmaster@1:    * Get absolute position of element
webmaster@1:    */
webmaster@1:   fb.absolutePosition = function (el) {
webmaster@1:     var r = { x: el.offsetLeft, y: el.offsetTop };
webmaster@1:     // Resolve relative to offsetParent
webmaster@1:     if (el.offsetParent) {
webmaster@1:       var tmp = fb.absolutePosition(el.offsetParent);
webmaster@1:       r.x += tmp.x;
webmaster@1:       r.y += tmp.y;
webmaster@1:     }
webmaster@1:     return r;
webmaster@1:   };
webmaster@1: 
webmaster@1:   /* Various color utility functions */
webmaster@1:   fb.pack = function (rgb) {
webmaster@1:     var r = Math.round(rgb[0] * 255);
webmaster@1:     var g = Math.round(rgb[1] * 255);
webmaster@1:     var b = Math.round(rgb[2] * 255);
webmaster@1:     return '#' + (r < 16 ? '0' : '') + r.toString(16) +
webmaster@1:            (g < 16 ? '0' : '') + g.toString(16) +
webmaster@1:            (b < 16 ? '0' : '') + b.toString(16);
webmaster@1:   };
webmaster@1: 
webmaster@1:   fb.unpack = function (color) {
webmaster@1:     if (color.length == 7) {
webmaster@1:       return [parseInt('0x' + color.substring(1, 3)) / 255,
webmaster@1:         parseInt('0x' + color.substring(3, 5)) / 255,
webmaster@1:         parseInt('0x' + color.substring(5, 7)) / 255];
webmaster@1:     }
webmaster@1:     else if (color.length == 4) {
webmaster@1:       return [parseInt('0x' + color.substring(1, 2)) / 15,
webmaster@1:         parseInt('0x' + color.substring(2, 3)) / 15,
webmaster@1:         parseInt('0x' + color.substring(3, 4)) / 15];
webmaster@1:     }
webmaster@1:   };
webmaster@1: 
webmaster@1:   fb.HSLToRGB = function (hsl) {
webmaster@1:     var m1, m2, r, g, b;
webmaster@1:     var h = hsl[0], s = hsl[1], l = hsl[2];
webmaster@1:     m2 = (l <= 0.5) ? l * (s + 1) : l + s - l*s;
webmaster@1:     m1 = l * 2 - m2;
webmaster@1:     return [this.hueToRGB(m1, m2, h+0.33333),
webmaster@1:         this.hueToRGB(m1, m2, h),
webmaster@1:         this.hueToRGB(m1, m2, h-0.33333)];
webmaster@1:   };
webmaster@1: 
webmaster@1:   fb.hueToRGB = function (m1, m2, h) {
webmaster@1:     h = (h < 0) ? h + 1 : ((h > 1) ? h - 1 : h);
webmaster@1:     if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
webmaster@1:     if (h * 2 < 1) return m2;
webmaster@1:     if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;
webmaster@1:     return m1;
webmaster@1:   };
webmaster@1: 
webmaster@1:   fb.RGBToHSL = function (rgb) {
webmaster@1:     var min, max, delta, h, s, l;
webmaster@1:     var r = rgb[0], g = rgb[1], b = rgb[2];
webmaster@1:     min = Math.min(r, Math.min(g, b));
webmaster@1:     max = Math.max(r, Math.max(g, b));
webmaster@1:     delta = max - min;
webmaster@1:     l = (min + max) / 2;
webmaster@1:     s = 0;
webmaster@1:     if (l > 0 && l < 1) {
webmaster@1:       s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));
webmaster@1:     }
webmaster@1:     h = 0;
webmaster@1:     if (delta > 0) {
webmaster@1:       if (max == r && max != g) h += (g - b) / delta;
webmaster@1:       if (max == g && max != b) h += (2 + (b - r) / delta);
webmaster@1:       if (max == b && max != r) h += (4 + (r - g) / delta);
webmaster@1:       h /= 6;
webmaster@1:     }
webmaster@1:     return [h, s, l];
webmaster@1:   };
webmaster@1: 
webmaster@1:   // Install mousedown handler (the others are set on the document on-demand)
webmaster@1:   $('*', e).mousedown(fb.mousedown);
webmaster@1: 
webmaster@1:     // Init color
webmaster@1:   fb.setColor('#000000');
webmaster@1: 
webmaster@1:   // Set linked elements/callback
webmaster@1:   if (callback) {
webmaster@1:     fb.linkTo(callback);
webmaster@1:   }
webmaster@1: };