-
Notifications
You must be signed in to change notification settings - Fork 0
/
random_note.js
240 lines (183 loc) · 5.58 KB
/
random_note.js
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
const ROULETTE_DIFFERENCE_WEIGHT = 1.2;
const baseNotes = {
"C" : { bgColor: "#28ff00" },
"C#": { bgColor: "#00ffe9" },
"D" : { bgColor: "#007cff" },
"D#": { bgColor: "#0500ff" },
"E" : { bgColor: "#4500ea" },
"F" : { bgColor: "#54004e" },
"F#": { bgColor: "#740000" },
"G" : { bgColor: "#b30101" },
"G#": { bgColor: "#ee0000" },
"A" : { bgColor: "#ff6300" },
"A#": { bgColor: "#ffec01" },
"B" : { bgColor: "#99fe00" },
}
const presetNameLabel = document.getElementById('presetNameLabel');
const noteLabel = document.getElementById('noteLabel');
const directionIconLabel = document.getElementById('direction-icon-label');
const solutionLabel = document.getElementById('solution-label');
const menu = document.getElementById('menu');
const menuBody = document.getElementById('menu_body');
const menuToggler = document.getElementById('menu_toggler');
const menuOverlay = document.getElementById('menu_overlay');
const presetList = document.getElementById('preset_list');
/**
* @type {boolean} if the interval direction is up
*/
let directionUp = true;
let selectedNote = null;
let activeNotes = null;
let countTotal = 0;
let currentPreset = null;
// load last used preset
const lastPreset = localStorage.getItem('rms_preset');
if (lastPreset && presets[lastPreset]) {
applyPreset(lastPreset, presets)
} else {
// sets note on load
applyPreset('P5', presets);
}
function xor(a,b) {
return a && !b || !a && b;
}
function randomIndex(length) {
return Math.floor((Math.random() * length));
}
function createRoulette() {
const sectors = [];
const equalSectorsSize = 1 / activeNotes.length;
const average = Math.round(activeNotes
.map(a => a.count)
.reduce((a, b) => (a + b))
/ activeNotes.length);
let accumulatedDiference = 0;
for (let i = 0; i < activeNotes.length; i++) {
const note = activeNotes[i];
const difference = (ROULETTE_DIFFERENCE_WEIGHT / activeNotes.length) * (average - note.count);
const distributedDiference = difference / (activeNotes.length - 1);
sectors[i] = equalSectorsSize + difference + distributedDiference;
accumulatedDiference += distributedDiference;
}
let total = 0;
for (let i = 0; i < sectors.length; i++) {
const sectionSize = Math.max(0, sectors[i] - accumulatedDiference)
sectors[i] = sectionSize;
total += sectionSize;
}
// normalize values
for (let i = 0; i < sectors.length; i++) {
sectors[i] /= total;
}
return sectors;
}
function getSelectedSector(random, sectors) {
let accumulation = 0;
for (let i = 0; i < sectors.length; i++) {
if (random <= sectors[i] + accumulation) {
return i;
}
accumulation += sectors[i];
}
return -1;
}
function setNote(index) {
selectedNote = activeNotes[index];
if (selectedNote) {
selectedNote.count++;
countTotal++;
if (selectedNote.noteName[1]) {
noteLabel.innerHTML = selectedNote.noteName;
} else {
noteLabel.innerText = selectedNote.noteName;
}
document.body.style.backgroundColor = baseNotes[selectedNote.enharmonic].bgColor;
}
}
function randomNote() {
activeNotes.sort();
// choose a random direction for next note
directionUp = Math.random() > 0.5;
// show new direction in the screen
directionIconLabel.innerText = directionUp ? '☝' : '👇';
// hide solution
solutionLabel.classList.add('hidden');
solutionLabel.innerText = '';
const roulette = createRoulette();
const randomSelectedIndex = getSelectedSector(Math.random(), roulette);
setNote(randomSelectedIndex);
}
function applyPreset(presetID, presets) {
localStorage.setItem('rms_preset', presetID);
const preset = presets[presetID];
currentPreset = preset;
presetNameLabel.innerText = preset.name;
if (preset.alias) {
activeNotes = presets[preset.alias].notes;
} else {
activeNotes = preset.notes;
}
activeNotes.forEach(function(note) {
note.count = 0;
});
countTotal = 0;
randomNote();
menu.classList.remove('open');
menuOverlay.classList.remove('open');
}
function revealSolution() {
solutionLabel.innerText = xor(directionUp, currentPreset.reversed) ? selectedNote.next : selectedNote.prev;
solutionLabel.classList.remove('hidden');
}
menuToggler.addEventListener('click', function(event) {
menu.classList.toggle('open');
menuOverlay.classList.toggle('open');
event.stopPropagation();
});
menuOverlay.addEventListener('click', function (event) {
if (menu.classList.contains('open')) {
menuToggler.click();
event.stopPropagation();
}
});
document.body.style.height = window.innerHeight + 'px';
window.addEventListener('resize', event => {
document.body.style.height = window.innerHeight + 'px';
});
menuBody.addEventListener('click', event => event.stopPropagation());
document.addEventListener('click', randomNote);
document.addEventListener('keydown', event => {
switch (event.code) {
case "Space":
if (menu.classList.contains('open')) {
menuToggler.click();
} else {
randomNote();
}
break;
case "Escape":
if (menu.classList.contains('open')) {
menuToggler.click();
}
break;
case "KeyM":
menuToggler.click();
break;
case "KeyS":
revealSolution();
break;
}
});
// reveal solution logic
solutionLabel.addEventListener('click', ev => {
revealSolution();
ev.stopPropagation();
});
// add presets to menu
for (const presetID in presets) {
const preset = presets[presetID];
const li = document.createElement('li');
li.innerText = preset.name;
li.addEventListener('click', applyPreset.bind(null, presetID, presets));
presetList.appendChild(li);
}