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