Gradientifier/index.html at master · lendrick/Gradientifier · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
<!DOCTYPE html>
<html>
<head>

<style>
body {
  background-color: #888;
  font-family: sans-serif;
}

.color {
  height: 64px;
  width: 64px;
  display: inline-block;
  background-color: #ccc;
}

.container {
  display: inline-block;
}

.instructions {
  font-size: small;
}

#colors {
  margin-bottom: 20px;
}

#colorList {
  height: 30px;
  width: 400px;
}

#reflectivitySlider, #illuminationSlider, #hlSlider {
  width: 300px;
  margin-left: 30px;
  margin-bottom: 20px;
}

</style>

<script type="text/javascript" src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.10.3/jquery-ui.js"></script>
<script type="text/javascript" src="farbtastic/farbtastic.js"></script>
<link rel="stylesheet" href="farbtastic/farbtastic.css" type="text/css" />
<link rel="stylesheet" href="http://code.jquery.com/ui/1.10.3/themes/smoothness/jquery-ui.css">

<script>
var palette_hex = [
  '#000000',
  '#222034',
  '#45283C',
  '#663931',
  '#8F563B',
  '#DF7126',
  '#D9A066',
  '#EEC39A',
  '#FBF236',
  '#99E550',
  '#6ABE30',
  '#37946E',
  '#4B692F',
  '#524B24',
  '#323C39',
  '#3F3F74',
  '#306082',
  '#5B6EE1',
  '#639BFF',
  '#5FCDE4',
  '#CBDBFC',
  '#FFFFFF',
  '#9BADB7',
  '#847E87',
  '#696A6A',
  '#595652',
  '#76428A',
  '#AC3232',
  '#D95763',
  '#D77BBA',
  '#8F974A',
  '#8A6F30'
];

var palette = [];
var COLORS = 5;
var excludeMatches;
var img;
var canvas = document.createElement('canvas');
canvas.width = 96;
canvas.height = 80;
var ctx = canvas.getContext('2d');
var imgBufferCanvas = document.createElement('canvas');
var imgBuffer = imgBufferCanvas.getContext('2d');
var bugAlert = false;

$(function() {
  //var canvas = $('#canvas');
  //ctx = canvas[0].getContext('2d');

  $('#instructions').click(function() {
    $('.instructions').slideToggle();
  });

  for(var i = 0; i < palette_hex.length; i++) {
    palette.push(getColor(palette_hex[i]));
  }

  img = new Image();
  img.onload = function() {
    imgBuffer.drawImage(img, 0, 0, 96, 80);
    $('#reflectivitySlider').slider({ max: 100, slide: calculate, stop: calculate, value: get('r', 0) });
    $('#illuminationSlider').slider({ max: 100, slide: calculate, stop: calculate, value: get('illum', 50) });
    $('#hlSlider').slider({ max: 100, slide: calculate, stop: calculate, value: get('hm', 0) });


    $('.picker').mousemove(function() {
      calculate();
    });

    $('.picker').mouseup(function() {
      calculate();
    });

    calculate();
  }

  img.src = 'puzzle.png';

  $('#objectColor').val(get('co', '#8a8a8a'));
  $('#highlightColor').val(get('ch', '#ffffd1'));
  $('#ambientColor').val(get('ca', '#15306f'));

  $('#objectPicker').farbtastic('#objectColor');
  $('#highlightPicker').farbtastic('#highlightColor');
  $('#ambientPicker').farbtastic('#ambientColor');

});

function calculate() {
  var i;
  var results = [];
  var hexResults = [];
  excludeMatches = {};

  var co = getColor($('#objectColor').val());
  var ch = getColor($('#highlightColor').val());
  var ca = getColor($('#ambientColor').val());
  var r = parseInt($('#reflectivitySlider').slider("value")) / 100;
  var illum = Math.pow(.15, parseInt($('#illuminationSlider').slider("value")) / 50 - 1);
  var hm = parseInt($('#hlSlider').slider("value")) / 25 + 1;

  var bookmark = '';
  bookmark += "?co=" + escape($('#objectColor').val());
  bookmark += "&ch=" + escape($('#highlightColor').val());
  bookmark += "&ca=" + escape($('#ambientColor').val());
  bookmark += "&r=" + $('#reflectivitySlider').slider("value");
  bookmark += "&illum=" + $('#illuminationSlider').slider("value");
  bookmark += "&hm=" + $('#hlSlider').slider("value");
  $('#bookmark').html('<a href="' + bookmark + '" target="_blank">Bookmark Result</a><br>' +
    '<a href="rainbow.html' + bookmark + '&s=0&d=0&t=0" target="_blank">Taste the Rainbow!</a>');

  for(i = 0; i < COLORS; i++) {
    var weight = Math.pow(i / (COLORS - 1), illum);
    ch = multiply(ch, hm);

    var light = average(ca, ch, weight);

    //var result = closestMatch(palette, multiply(co, light));
    var result = multiply(co, light);
    result = average(light, result, r);
    var closest = closestMatch(palette, result);
    results.push(closest);
  }

  // Sort by luminance

  for(i = 0; i < COLORS; i++) {
    for(var j = 0; j < COLORS - 1; j++) {
      if(luminance(results[j]) < luminance(results[j+1])) {
        var x = results[j];
        results[j] = results[j+1];
        results[j+1] = x;
      }
    }
  }


  for(i = 0; i < COLORS; i++) {
    var hex = hexColor(results[i]);
    hexResults.push(hex);

    $('#color' + i).css('background-color', hex);
  }

  $('#colorList').text(hexResults.join(' '));
  var imgData = imgBuffer.getImageData(0, 0, 96, 80);
  //console.log(results);
  //console.log(imgData);
  var nonZero = false;

  for(var i = 0; i < 96 * 80; i++) {
    var c = null;
    var rv = imgData.data[i*4];

    if(rv == 222) {
      c = 0;
      nonZero = true;
    } else if(rv == 133) {
      c = 1;
    } else if(rv == 117) {
      c = 2;
    } else if(rv == 78) {
      c = 3;
    } else if(rv == 20) {
      c = 4;
    }

    if(c !== null) {
      //console.log(i + " " + r + " " + c);
      //console.log(results[c]);
      imgData.data[i*4] = Math.round(results[c].r * 255);
      imgData.data[i*4+1] = Math.round(results[c].g * 255);
      imgData.data[i*4+2] = Math.round(results[c].b * 255);
    }
  }

  if(!nonZero && !bugAlert) {
    bugAlert = true;
    alert("There is a bug in Firefox and Chrome in Windows 8 that prevents this program from working correctly.  If you are seeing this message, you should try running it in IE.");
  }


  ctx.putImageData(imgData, 0, 0);

  var output = canvas.toDataURL("image/png");
  $('#previewimg').html('<img src="' + output + '"/>');
}

function getColor(hex) {
  var color = {};
  hex = hex.substr(1);

  color.r = parseInt("0x" + hex.substr(0, 2)) / 255;
  color.g = parseInt("0x" + hex.substr(2, 2)) / 255;
  color.b = parseInt("0x" + hex.substr(4, 2)) / 255;

  return color;
}

function closestMatch(pal, c) {
  var distance = null;
  var match = 0;
  var i;

  for(i = 0; i < pal.length; i++) {
    var p = pal[i];
    var d = Math.sqrt(Math.pow(c.r - p.r, 2) + Math.pow(c.g - p.g, 2) + Math.pow(c.b - p.b, 2));
    if((distance === null || d < distance) && excludeMatches[i] === undefined) {
      distance = d;
      match = i;
    }
  }

  excludeMatches[match] = true;
  return pal[match];
}

function luminance(c) {
  return 0.299*c.r + 0.587*c.g + 0.114*c.b;
}

function multiply(color1, color2) {
  var result = { r: color1.r, g: color1.g, b: color1.b };

  if(typeof color2 === "number") {
    result.r *= color2;
    result.g *= color2;
    result.b *= color2;
  } else {
    result.r *= color2.r;
    result.g *= color2.g;
    result.b *= color2.b;
  }

  return result;
}

function average(color1, color2, weight) {
  return {
    r: color1.r * weight + color2.r * (1 - weight),
    g: color1.g * weight + color2.g * (1 - weight),
    b: color1.b * weight + color2.b * (1 - weight)
  };
}

function hexColor(color) {
  var result = '#';
  var r = Math.round(color.r * 255).toString(16);
  var g = Math.round(color.g * 255).toString(16);
  var b = Math.round(color.b * 255).toString(16);

  if(r.length == 1) r = "0" + r;
  if(g.length == 1) g = "0" + g;
  if(b.length == 1) b = "0" + b;

  result += r + g + b;
  return result;
}

function get(name, def) {
  name = name.replace(/[\[]/, "\\\[").replace(/[\]]/, "\\\]");
  var regex = new RegExp("[\\?&]" + name + "=([^&#]*)"),
    results = regex.exec(location.search);
  return results == null ? def : decodeURIComponent(results[1].replace(/\+/g, " "));
}

</script>
</head>

<body>
  <a href='javascript:void()' id='instructions'>Hide/Show instructions</a><br>
  <div class='instructions'>
  <p>This page generates gradients for the Dawnbringer 32 color palette.  A gradient is calculated by
  assuming that you have an object of a particular color, lit by a point light of a particular color
  to provide highlights, and ambient light of another color to illuminate shadows.  The reflectivity
  slider makes the object more or less reflective.  The more reflective an object is, the less its
  own color will figure into the color of the gradient.</p>

  <p>The default values for the highlight and ambient color are meant to approximate daylight.</p>

  <p>As a rule, the highlight should be fairly bright and the ambient light should be fairly dark.<p>

  <p>Adjust the illumination slider to skew the palette toward light or shadows.  Moving it to the
  left will result in bright colors, whereas moving it to the right will result in dark colors with
  dramatic highlights.</p>

  <p>The highlight multiplier is meant to allow your highlight color to exceed an intensity of #ffffff
  for the purpose of calculating the gradient, which is good for highlights that need to be very bright
  but also saturated.  The RGB values will be clamped to 255 in the final output.  The default value
  (the slider all the way to the left) is a multiplier of 1.</p>
  </div>

  <div class='container'>
    Object color:<br>
    <input type='text' name='objectColor' id='objectColor' value='#8a8a8a'>
    <div id='objectPicker' class='picker'></div>
  </div>
  <div class='container'>
    Highlight color:<br>
    <input type='text' name='highlightColor' id='highlightColor' value='#ffffd1'>
    <div id='highlightPicker' class='picker'></div>
  </div>
  <div class='container'>
    Ambient color:<br>
    <input type='text' name='ambientColor' id='ambientColor' value='#15306f'>
    <div id='ambientPicker' class='picker'></div>
  </div>
  <div>
    Reflectivity:  (--> More reflective)<br>
    <div id="reflectivitySlider"></div>
  </div>
  <div>
    Illumination:  (--> Darker)<br>
    <div id="illuminationSlider"></div>
  </div>
  <div>
    Highlight Multiplier:  (--> Brighter)<br>
    <div id="hlSlider"></div>
  </div>

  <div id='colors'>
    Gradient:<br>
    <div class='color' id='color0'></div><div class='color' id='color1'></div><div class='color' id='color2'></div><div class='color' id='color3'></div><div class='color' id='color4'></div>
    <div id='colorList'></div>
    <div id='bookmark'></div>
  </div>

  <div id='preview'>
    Preview:<br>
    <div id='previewimg'></div>
    <!--canvas height='80' width='96' id='canvas'></canvas-->
  </div>

  <a href='https://github.com/lendrick/Gradientifier/archive/master.zip'>Download latest version</a> from <a href='https://github.com/lendrick/Gradientifier'>the GitHub repository</a>.
</body>

</html>