RGB Converter.wdgt/Widget.js

   1 /*=====================================================================*\
   2 || ###################################################################
   3 || # RGB Converter
   4 || # Copyright (c)2002-2010 Blue Static
   5 || #
   6 || # This program is free software; you can redistribute it and/or modify
   7 || # it under the terms of the GNU General Public License as published by
   8 || # the Free Software Foundation; version 2 of the License.
   9 || #
  10 || # This program is distributed in the hope that it will be useful, but
  11 || # WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  12 || # or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  13 || # more details.
  14 || #
  15 || # You should have received a copy of the GNU General Public License along
  16 || # with this program; if not, write to the Free Software Foundation, Inc.,
  17 || # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
  18 || ###################################################################
  19 \*=====================================================================*/
  20
  21 var colors_ = {
  22   red   : 60,
  23   green : 60,
  24   blue  : 60,
  25   hex   : '3C3C3C'
  26 };
  27
  28 var backShowing_ = false;
  29
  30 // ###################################################################
  31 // widget init
  32 function setup()
  33 {
  34   Draw();
  35   createGenericButton(document.getElementById("backbutton"), "Done", hide_back, 0);
  36   document.getElementById("revision").innerHTML = "(r" + document.getElementById("revision").innerHTML.replace(/[^0-9]/g, "") + ")";
  37 }
  38
  39 // ###################################################################
  40 // watches the three RGB fields to make sure they don't go over the limites
  41 function rgbwatcher(color)
  42 {
  43   field = document.getElementById(color + "input");
  44
  45   // handle RGB triads
  46   if (triad = field.value.match(/(rgb)?\(?([0-9]{1,3}),\s?([0-9]{1,3}),\s?([0-9]{1,3})\)?/))
  47   {
  48     document.getElementById("redinput").value = triad[2];
  49     document.getElementById("greeninput").value = triad[3];
  50     document.getElementById("blueinput").value = triad[4];
  51
  52     rgbwatcher("red");
  53     rgbwatcher("green");
  54     rgbwatcher("blue");
  55     return;
  56   }
  57
  58   // sanitize the number
  59   var newval = field.value.replace(/[^0-9\-\.]*/g, "");
  60   newval = Math.floor(newval);
  61
  62   // make sure we don't go over 255
  63   if (newval > 255)
  64   {
  65     newval = 255;
  66   }
  67   else if (newval < 0)
  68   {
  69     newval = 0;
  70   }
  71
  72   // update the text field
  73   field.value = newval;
  74
  75   // set fields[]
  76   colors_[color] = newval;
  77
  78   // set hex
  79   update_hex();
  80
  81   // redraw the swatch
  82   Draw();
  83 }
  84
  85 // ###################################################################
  86 function Draw()
  87 {
  88   var canvas  = document.getElementById('wheel');
  89   var context = canvas.getContext('2d');
  90   var radius  = canvas.width / 2 - 3;
  91   var center  = [canvas.width / 2, canvas.height / 2];
  92   context.strokeStyle = 'black';
  93
  94   context.clearRect(0, 0, canvas.width, canvas.height);
  95
  96   if (backShowing_) {
  97     // Draw the sheen gradient.
  98     context.beginPath();
  99     context.arc(center[0], center[1], radius, 0, Math.PI * 2, true);
 100     var gradient = context.createLinearGradient(0, 0, 0, canvas.height);
 101     gradient.addColorStop(0, 'rgb(200, 200, 200)');
 102     gradient.addColorStop(1, 'rgb(0, 0, 0)');
 103     context.fillStyle = gradient;
 104     context.fill();
 105     context.closePath();
 106     return;
 107   }
 108
 109   // Draw the individual components. Start with red.
 110   context.beginPath();
 111   context.moveTo(center[0], center[1]);
 112   context.arc(canvas.width / 2,
 113               canvas.height / 2,
 114               radius,
 115               Math.PI * 4/3,
 116               Math.PI * 6/3,
 117               false);
 118   context.lineTo(center[0], center[1]);
 119   context.fillStyle = _GetComponentColorString('red');
 120   context.fill();
 121   context.stroke();
 122
 123   // Green component.
 124   context.beginPath();
 125   context.moveTo(center[0], center[1]);
 126   context.arc(canvas.width / 2,
 127               canvas.height / 2,
 128               radius,
 129               Math.PI * 0,
 130               Math.PI * 2/3,
 131               false);
 132   context.lineTo(center[0], center[1]);
 133   context.fillStyle = _GetComponentColorString('green');
 134   context.fill();
 135   context.stroke();
 136
 137   // Blue component.
 138   context.beginPath();
 139   context.moveTo(center[0], center[1]);
 140   context.arc(canvas.width / 2,
 141               canvas.height / 2,
 142               radius,
 143               Math.PI * 2/3,
 144               Math.PI * 4/3,
 145               false);
 146   context.lineTo(center[0], center[1]);
 147   context.fillStyle = _GetComponentColorString('blue');
 148   context.fill();
 149   context.stroke();
 150
 151   // Draw the sheen gradient.
 152   context.beginPath();
 153   context.arc(center[0], center[1], radius, 0, Math.PI * 2, true);
 154   var gradient = context.createLinearGradient(0, 0, 0, canvas.height);
 155   gradient.addColorStop(0, 'rgba(255,255,255,.5)');
 156   gradient.addColorStop(1, 'rgba(0,0,0,0)');
 157   context.fillStyle = gradient;
 158   context.fill();
 159   context.closePath();
 160
 161   // Draw the inner wheel.
 162   context.beginPath();
 163   context.arc(center[0], center[1], canvas.width / 4.75, 0, Math.PI * 2, true);
 164   context.fillStyle = _GetRGBColorString();
 165   context.fill();
 166   context.strokeStyle = 'black';
 167   context.stroke();
 168   context.closePath();
 169 }
 170
 171 // ###################################################################
 172 // Returns the rgb(,,,) color string.
 173
 174 function _GetRGBColorString()
 175 {
 176   return 'rgb(' + colors_.red + ',' + colors_.green + ',' + colors_.blue + ')';
 177 }
 178
 179 // ###################################################################
 180 // Returns an individual color component's color string.
 181
 182 function _GetComponentColorString(color)
 183 {
 184   if (color == 'red') {
 185     return 'rgb(' + colors_.red + ',0,0)';
 186   } else if (color == 'green') {
 187     return 'rgb(0,' + colors_.green + ',0)';
 188   } else if (color == 'blue') {
 189     return 'rgb(0,0,' + colors_.blue + ')';
 190   }
 191   alert('Invalid color ' + color);
 192 }
 193
 194 // ###################################################################
 195 // watches the hex field for updates
 196 function hexwatcher()
 197 {
 198   field = document.getElementById("hexinput");
 199
 200   // sanitize the hex
 201   var newval = field.value.replace(/[^0-9a-f]*/gi, "");
 202
 203   // get the length
 204   var length = newval.length;
 205
 206   // make sure we're always 6
 207   if (length > 6)
 208   {
 209     newval = newval.substr(0, 6);
 210   }
 211   else if (length == 3)
 212   {
 213     newval = newval.substr(0, 1) + newval.substr(0, 1) + newval.substr(1, 1) + newval.substr(1, 1) + newval.substr(2, 1) + newval.substr(2, 1);
 214   }
 215   else if (length < 6)
 216   {
 217     for (var i = length; i <= 6; i++)
 218     {
 219       newval = "" + newval + "0";
 220     }
 221   }
 222
 223   // update the field
 224   field.value = newval;
 225
 226   // update fields[]
 227   colors_.hex = newval;
 228
 229   // set RGB
 230   update_rgb();
 231
 232   // redraw the swatch
 233   Draw();
 234 }
 235
 236 // ###################################################################
 237 // update the hex value
 238 function update_hex()
 239 {
 240   var hexstr = dec2hex(colors_.red) + dec2hex(colors_.green) + dec2hex(colors_.blue);
 241   colors_.hex = hexstr;
 242   document.getElementById("hexinput").value = hexstr;
 243 }
 244
 245 // ###################################################################
 246 // update the RGB values
 247 function update_rgb()
 248 {
 249   // regex match the bits
 250   var bits = colors_.hex.match(/(..)(..)(..)/);
 251
 252   colors_.red = hex2dec(bits[1]);
 253   colors_.green = hex2dec(bits[2]);
 254   colors_.blue = hex2dec(bits[3]);
 255
 256   // construct the hex values
 257   document.getElementById("redinput").value = colors_.red;
 258   document.getElementById("greeninput").value = colors_.green;
 259   document.getElementById("blueinput").value = colors_.blue;
 260 }
 261
 262 // ###################################################################
 263 // convert a decimal to a hexidecimal
 264 function dec2hex(dec)
 265 {
 266   var hexstr = "0123456789ABCDEF";
 267   var low = dec % 16;
 268   var high = (dec - low) / 16;
 269   hex = "" + hexstr.charAt(high) + hexstr.charAt(low);
 270
 271   return hex.toString();
 272 }
 273
 274 // ###################################################################
 275 // converts a hexidecimal to a decimal
 276 function hex2dec(hex)
 277 {
 278   return parseInt(hex, 16);
 279 }
 280
 281 // ###################################################################
 282 // ###################################################################
 283 // ###################################################################
 284
 285 // flip data
 286
 287 function show_back()
 288 {
 289   backShowing_ = true;
 290
 291   var front = document.getElementById("front");
 292   var back = document.getElementById("back");
 293
 294   if (window.widget)
 295   {
 296     widget.prepareForTransition("ToBack");
 297   }
 298
 299   front.style.display = "none";
 300   back.style.display = "block";
 301
 302   if (window.widget)
 303   {
 304     setTimeout("widget.performTransition();", 0);
 305   }
 306
 307   document.getElementById("fliprollie").style.display = "none";
 308
 309   Draw();
 310 }
 311
 312 function hide_back()
 313 {
 314   backShowing_ = false;
 315
 316   var front = document.getElementById("front");
 317   var back = document.getElementById("back");
 318
 319   if (window.widget)
 320   {
 321     widget.prepareForTransition("ToFront");
 322   }
 323
 324   back.style.display = "none";
 325   front.style.display = "block";
 326
 327   if (window.widget)
 328   {
 329     setTimeout("widget.performTransition();", 0);
 330   }
 331
 332   Draw();
 333 }
 334
 335 var flipShown = false;
 336
 337 var animation = {
 338   duration : 0,
 339   starttime : 0,
 340   to : 1.0,
 341   now : 0.0,
 342   from : 0.0,
 343   firstElement : null,
 344   timer : null
 345 };
 346
 347 function mousemove(event)
 348 {
 349   if (backShowing_)
 350     return;
 351
 352   if (!flipShown)
 353   {
 354     if (animation.timer != null)
 355     {
 356       clearInterval(animation.timer);
 357       animation.timer  = null;
 358     }
 359
 360     var starttime = (new Date).getTime() - 13;
 361
 362     animation.duration = 500;
 363     animation.starttime = starttime;
 364     animation.firstElement = document.getElementById("flip");
 365     animation.timer = setInterval("animate();", 13);
 366     animation.from = animation.now;
 367     animation.to = 1.0;
 368     animate();
 369     flipShown = true;
 370   }
 371 }
 372
 373 function mouseexit(event)
 374 {
 375   if (backShowing_)
 376     return;
 377
 378   if (flipShown)
 379   {
 380     // fade in the flip widget
 381     if (animation.timer != null)
 382     {
 383       clearInterval (animation.timer);
 384       animation.timer  = null;
 385     }
 386
 387     var starttime = (new Date).getTime() - 13;
 388
 389     animation.duration = 500;
 390     animation.starttime = starttime;
 391     animation.firstElement = document.getElementById("flip");
 392     animation.timer = setInterval("animate();", 13);
 393     animation.from = animation.now;
 394     animation.to = 0.0;
 395     animate();
 396     flipShown = false;
 397   }
 398 }
 399
 400
 401 function animate()
 402 {
 403   var T;
 404   var ease;
 405   var time = (new Date).getTime();
 406
 407   T = limit_3(time - animation.starttime, 0, animation.duration);
 408
 409   if (T >= animation.duration)
 410   {
 411     clearInterval(animation.timer);
 412     animation.timer = null;
 413     animation.now = animation.to;
 414   }
 415   else
 416   {
 417     ease = 0.5 - (0.5 * Math.cos(Math.PI * T / animation.duration));
 418     animation.now = compute_next_float(animation.from, animation.to, ease);
 419   }
 420
 421   animation.firstElement.style.opacity = animation.now;
 422 }
 423
 424 function limit_3 (a, b, c)
 425 {
 426     return a < b ? b : (a > c ? c : a);
 427 }
 428
 429 function compute_next_float(from, to, ease)
 430 {
 431     return from + (to - from) * ease;
 432 }
 433
 434 function enterflip(event)
 435 {
 436   document.getElementById("fliprollie").style.display = "block";
 437 }
 438
 439 function exitflip(event)
 440 {
 441   document.getElementById("fliprollie").style.display = "none";
 442 }
 443
 444 /*=====================================================================*\
 445 || ###################################################################
 446 || # $HeadURL$
 447 || # $Id$
 448 || ###################################################################
 449 \*=====================================================================*/