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Farbtastic

Farbtastic version for Rulesy's code

此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.cn-greasyfork.org/scripts/31200/204642/Farbtastic.js 

  1. /**
  2.  * Farbtastic Color Picker 1.2
  3.  * © 2008 Steven Wittens
  4.  *
  5.  * This program is free software; you can redistribute it and/or modify
  6.  * it under the terms of the GNU General Public License as published by
  7.  * the Free Software Foundation; either version 2 of the License, or
  8.  * (at your option) any later version.
  9.  *
  10.  * This program is distributed in the hope that it will be useful,
  11.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13.  * GNU General Public License for more details.
  14.  *
  15.  * You should have received a copy of the GNU General Public License
  16.  * along with this program; if not, write to the Free Software
  17.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
  18.  */
  19.  
  20. jQuery.fn.farbtastic = function (callback) {
  21.   $.farbtastic(this, callback);
  22.   return this;
  23. };
  24.  
  25. jQuery.farbtastic = function (container, callback) {
  26.   var container = $(container).get(0);
  27.   return container.farbtastic || (container.farbtastic = new jQuery._farbtastic(container, callback));
  28. }
  29.  
  30. jQuery._farbtastic = function (container, callback) {
  31.   // Store farbtastic object
  32.   var fb = this;
  33.  
  34.   // Insert markup
  35.   $(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>');
  36.   var e = $('.farbtastic', container);
  37.   fb.wheel = $('.wheel', container).get(0);
  38.   // Dimensions
  39.   fb.radius = 84;
  40.   fb.square = 100;
  41.   fb.width = 194;
  42.  
  43.   // Fix background PNGs in IE6
  44.   if (navigator.appVersion.match(/MSIE [0-6]\./)) {
  45.     $('*', e).each(function () {
  46.       if (this.currentStyle.backgroundImage != 'none') {
  47.         var image = this.currentStyle.backgroundImage;
  48.         image = this.currentStyle.backgroundImage.substring(5, image.length - 2);
  49.         $(this).css({
  50.           'backgroundImage': 'none',
  51.           'filter': "progid:DXImageTransform.Microsoft.AlphaImageLoader(enabled=true, sizingMethod=crop, src='" + image + "')"
  52.         });
  53.       }
  54.     });
  55.   }
  56.  
  57.   /**
  58.    * Link to the given element(s) or callback.
  59.    */
  60.   fb.linkTo = function (callback) {
  61.     // Unbind previous nodes
  62.     if (typeof fb.callback == 'object') {
  63.       $(fb.callback).unbind('keyup', fb.updateValue);
  64.     }
  65.  
  66.     // Reset color
  67.     fb.color = null;
  68.  
  69.     // Bind callback or elements
  70.     if (typeof callback == 'function') {
  71.       fb.callback = callback;
  72.     }
  73.     else if (typeof callback == 'object' || typeof callback == 'string') {
  74.       fb.callback = $(callback);
  75.       fb.callback.bind('keyup', fb.updateValue);
  76.       if (fb.callback.get(0).value) {
  77.         fb.setColor(fb.callback.get(0).value);
  78.       }
  79.     }
  80.     return this;
  81.   }
  82.   fb.updateValue = function (event) {
  83.     if (this.value && this.value != fb.color) {
  84.       fb.setColor(this.value);
  85.     }
  86.   }
  87.  
  88.   /**
  89.    * Change color with HTML syntax #123456
  90.    */
  91.   fb.setColor = function (color) {
  92.     var unpack = fb.unpack(color);
  93.     if (fb.color != color && unpack) {
  94.       fb.color = color;
  95.       fb.rgb = unpack;
  96.       fb.hsl = fb.RGBToHSL(fb.rgb);
  97.       fb.updateDisplay();
  98.     }
  99.     return this;
  100.   }
  101.  
  102.   /**
  103.    * Change color with HSL triplet [0..1, 0..1, 0..1]
  104.    */
  105.   fb.setHSL = function (hsl) {
  106.     fb.hsl = hsl;
  107.     fb.rgb = fb.HSLToRGB(hsl);
  108.     fb.color = fb.pack(fb.rgb);
  109.     fb.updateDisplay();
  110.     return this;
  111.   }
  112.  
  113.   /////////////////////////////////////////////////////
  114.  
  115.   /**
  116.    * Retrieve the coordinates of the given event relative to the center
  117.    * of the widget.
  118.    */
  119.   fb.widgetCoords = function (event) {
  120.     var x, y;
  121.     var el = event.target || event.srcElement;
  122.     var reference = fb.wheel;
  123.  
  124.     if (typeof event.offsetX != 'undefined') {
  125.       // Use offset coordinates and find common offsetParent
  126.       var pos = { x: event.offsetX, y: event.offsetY };
  127.  
  128.       // Send the coordinates upwards through the offsetParent chain.
  129.       var e = el;
  130.       while (e) {
  131.         e.mouseX = pos.x;
  132.         e.mouseY = pos.y;
  133.         pos.x += e.offsetLeft;
  134.         pos.y += e.offsetTop;
  135.         e = e.offsetParent;
  136.       }
  137.  
  138.       // Look for the coordinates starting from the wheel widget.
  139.       var e = reference;
  140.       var offset = { x: 0, y: 0 }
  141.       while (e) {
  142.         if (typeof e.mouseX != 'undefined') {
  143.           x = e.mouseX - offset.x;
  144.           y = e.mouseY - offset.y;
  145.           break;
  146.         }
  147.         offset.x += e.offsetLeft;
  148.         offset.y += e.offsetTop;
  149.         e = e.offsetParent;
  150.       }
  151.  
  152.       // Reset stored coordinates
  153.       e = el;
  154.       while (e) {
  155.         e.mouseX = undefined;
  156.         e.mouseY = undefined;
  157.         e = e.offsetParent;
  158.       }
  159.     }
  160.     else {
  161.       // Use absolute coordinates
  162.       var pos = fb.absolutePosition(reference);
  163.       x = (event.pageX || 0*(event.clientX + $('html').get(0).scrollLeft)) - pos.x;
  164.       y = (event.pageY || 0*(event.clientY + $('html').get(0).scrollTop)) - pos.y;
  165.     }
  166.     // Subtract distance to middle
  167.     return { x: x - fb.width / 2, y: y - fb.width / 2 };
  168.   }
  169.  
  170.   /**
  171.    * Mousedown handler
  172.    */
  173.   fb.mousedown = function (event) {
  174.     // Capture mouse
  175.     if (!document.dragging) {
  176.       $(document).bind('mousemove', fb.mousemove).bind('mouseup', fb.mouseup);
  177.       document.dragging = true;
  178.     }
  179.  
  180.     // Check which area is being dragged
  181.     var pos = fb.widgetCoords(event);
  182.     fb.circleDrag = Math.max(Math.abs(pos.x), Math.abs(pos.y)) * 2 > fb.square;
  183.  
  184.     // Process
  185.     fb.mousemove(event);
  186.     return false;
  187.   }
  188.  
  189.   /**
  190.    * Mousemove handler
  191.    */
  192.   fb.mousemove = function (event) {
  193.     // Get coordinates relative to color picker center
  194.     var pos = fb.widgetCoords(event);
  195.  
  196.     // Set new HSL parameters
  197.     if (fb.circleDrag) {
  198.       var hue = Math.atan2(pos.x, -pos.y) / 6.28;
  199.       if (hue < 0) hue += 1;
  200.       fb.setHSL([hue, fb.hsl[1], fb.hsl[2]]);
  201.     }
  202.     else {
  203.       var sat = Math.max(0, Math.min(1, -(pos.x / fb.square) + .5));
  204.       var lum = Math.max(0, Math.min(1, -(pos.y / fb.square) + .5));
  205.       fb.setHSL([fb.hsl[0], sat, lum]);
  206.     }
  207.     return false;
  208.   }
  209.  
  210.   /**
  211.    * Mouseup handler
  212.    */
  213.   fb.mouseup = function () {
  214.     // Uncapture mouse
  215.     $(document).unbind('mousemove', fb.mousemove);
  216.     $(document).unbind('mouseup', fb.mouseup);
  217.     document.dragging = false;
  218.   }
  219.  
  220.   /**
  221.    * Update the markers and styles
  222.    */
  223.   fb.updateDisplay = function () {
  224.     // Markers
  225.     var angle = fb.hsl[0] * 6.28;
  226.     $('.h-marker', e).css({
  227.       left: Math.round(Math.sin(angle) * fb.radius + fb.width / 2) + 'px',
  228.       top: Math.round(-Math.cos(angle) * fb.radius + fb.width / 2) + 'px'
  229.     });
  230.  
  231.     $('.sl-marker', e).css({
  232.       left: Math.round(fb.square * (.5 - fb.hsl[1]) + fb.width / 2) + 'px',
  233.       top: Math.round(fb.square * (.5 - fb.hsl[2]) + fb.width / 2) + 'px'
  234.     });
  235.  
  236.     // Saturation/Luminance gradient
  237.     $('.color', e).css('backgroundColor', fb.pack(fb.HSLToRGB([fb.hsl[0], 1, 0.5])));
  238.  
  239.     // Linked elements or callback
  240.     if (typeof fb.callback == 'object') {
  241.       // Set background/foreground color
  242.       $(fb.callback).css({
  243.         backgroundColor: fb.color,
  244.         color: fb.hsl[2] > 0.5 ? '#000' : '#fff'
  245.       });
  246.  
  247.       // Change linked value
  248.       $(fb.callback).each(function() {
  249.         if (this.value && this.value != fb.color) {
  250.           this.value = fb.color;
  251.         }
  252.       });
  253.     }
  254.     else if (typeof fb.callback == 'function') {
  255.       fb.callback.call(fb, fb.color);
  256.     }
  257.   }
  258.  
  259.   /**
  260.    * Get absolute position of element
  261.    */
  262.   fb.absolutePosition = function (el) {
  263.     var r = { x: el.offsetLeft, y: el.offsetTop };
  264.     // Resolve relative to offsetParent
  265.     if (el.offsetParent) {
  266.       var tmp = fb.absolutePosition(el.offsetParent);
  267.       r.x += tmp.x;
  268.       r.y += tmp.y;
  269.     }
  270.     return r;
  271.   };
  272.  
  273.   /* Various color utility functions */
  274.   fb.pack = function (rgb) {
  275.     var r = Math.round(rgb[0] * 255);
  276.     var g = Math.round(rgb[1] * 255);
  277.     var b = Math.round(rgb[2] * 255);
  278.     return '#' + (r < 16 ? '0' : '') + r.toString(16) +
  279.            (g < 16 ? '0' : '') + g.toString(16) +
  280.            (b < 16 ? '0' : '') + b.toString(16);
  281.   }
  282.  
  283.   fb.unpack = function (color) {
  284.     if (color.length == 7) {
  285.       return [parseInt('0x' + color.substring(1, 3)) / 255,
  286.         parseInt('0x' + color.substring(3, 5)) / 255,
  287.         parseInt('0x' + color.substring(5, 7)) / 255];
  288.     }
  289.     else if (color.length == 4) {
  290.       return [parseInt('0x' + color.substring(1, 2)) / 15,
  291.         parseInt('0x' + color.substring(2, 3)) / 15,
  292.         parseInt('0x' + color.substring(3, 4)) / 15];
  293.     }
  294.   }
  295.  
  296.   fb.HSLToRGB = function (hsl) {
  297.     var m1, m2, r, g, b;
  298.     var h = hsl[0], s = hsl[1], l = hsl[2];
  299.     m2 = (l <= 0.5) ? l * (s + 1) : l + s - l*s;
  300.     m1 = l * 2 - m2;
  301.     return [this.hueToRGB(m1, m2, h+0.33333),
  302.         this.hueToRGB(m1, m2, h),
  303.         this.hueToRGB(m1, m2, h-0.33333)];
  304.   }
  305.  
  306.   fb.hueToRGB = function (m1, m2, h) {
  307.     h = (h < 0) ? h + 1 : ((h > 1) ? h - 1 : h);
  308.     if (h * 6 < 1) return m1 + (m2 - m1) * h * 6;
  309.     if (h * 2 < 1) return m2;
  310.     if (h * 3 < 2) return m1 + (m2 - m1) * (0.66666 - h) * 6;
  311.     return m1;
  312.   }
  313.  
  314.   fb.RGBToHSL = function (rgb) {
  315.     var min, max, delta, h, s, l;
  316.     var r = rgb[0], g = rgb[1], b = rgb[2];
  317.     min = Math.min(r, Math.min(g, b));
  318.     max = Math.max(r, Math.max(g, b));
  319.     delta = max - min;
  320.     l = (min + max) / 2;
  321.     s = 0;
  322.     if (l > 0 && l < 1) {
  323.       s = delta / (l < 0.5 ? (2 * l) : (2 - 2 * l));
  324.     }
  325.     h = 0;
  326.     if (delta > 0) {
  327.       if (max == r && max != g) h += (g - b) / delta;
  328.       if (max == g && max != b) h += (2 + (b - r) / delta);
  329.       if (max == b && max != r) h += (4 + (r - g) / delta);
  330.       h /= 6;
  331.     }
  332.     return [h, s, l];
  333.   }
  334.  
  335.   // Install mousedown handler (the others are set on the document on-demand)
  336.   $('*', e).mousedown(fb.mousedown);
  337.  
  338.     // Init color
  339.   fb.setColor('#000000');
  340.  
  341.   // Set linked elements/callback
  342.   if (callback) {
  343.     fb.linkTo(callback);
  344.   }
  345. }