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