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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