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script.js
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script.js
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//Global Variables
// global constants
const clueHoldTime = 1000; //how long to hold each clue's light/sound
const cluePauseTime = 333; //how long to pause in between clues
const nextClueWaitTime = 1000; //how long to wait before starting playback of the clue sequence
var volume = 0.6; //must be between 0.0 and 1.0
var pattern = [2, 5, 1, 4, 4, 5, 3, 1, 2, 4];
var progress = 0;
var gamePlaying = false;
var tonePlaying = false;
var guessCounter = 0;
function startGame() {
//initialize game variables
progress = 0;
gamePlaying = true;
document.getElementById("startBtn").classList.add("hidden");
document.getElementById("stopBtn").classList.remove("hidden");
playClueSequence();
}
function stopGame() {
gamePlaying = false;
document.getElementById("startBtn").classList.remove("hidden");
document.getElementById("stopBtn").classList.add("hidden");
}
// Sound Synthesis Functions
const freqMap = {
1: 761.6,
2: 829.6,
3: 992,
4: 1066.2,
5: 1278.2,
};
function playTone(btn, len) {
o.frequency.value = freqMap[btn];
g.gain.setTargetAtTime(volume, context.currentTime + 0.05, 0.025);
context.resume();
tonePlaying = true;
setTimeout(function () {
stopTone();
}, len);
}
function startTone(btn) {
if (!tonePlaying) {
context.resume();
o.frequency.value = freqMap[btn];
g.gain.setTargetAtTime(volume, context.currentTime + 0.05, 0.025);
context.resume();
tonePlaying = true;
}
}
function stopTone() {
g.gain.setTargetAtTime(0, context.currentTime + 0.05, 0.025);
tonePlaying = false;
}
// Page Initialization
// Init Sound Synthesizer
var AudioContext = window.AudioContext || window.webkitAudioContext;
var context = new AudioContext();
var o = context.createOscillator();
var g = context.createGain();
g.connect(context.destination);
g.gain.setValueAtTime(0, context.currentTime);
o.connect(g);
o.start(0);
function lightButton(btn) {
document.getElementById("button" + btn).classList.add("lit");
}
function clearButton(btn) {
document.getElementById("button" + btn).classList.remove("lit");
}
function playSingleClue(btn) {
if (gamePlaying) {
lightButton(btn);
playTone(btn, clueHoldTime);
setTimeout(clearButton, clueHoldTime, btn);
}
}
function playClueSequence() {
context.resume();
guessCounter = 0;
let delay = nextClueWaitTime; //set delay to initial wait time
for (let i = 0; i <= progress; i++) {
// for each clue that is revealed so far
console.log("play single clue: " + pattern[i] + " in " + delay + "ms");
setTimeout(playSingleClue, delay, pattern[i]); // set a timeout to play that clue
delay += clueHoldTime;
delay += cluePauseTime;
}
}
function guess(btn) {
console.log("user guessed: " + btn);
if (!gamePlaying) {
return;
}
if (pattern[guessCounter] == btn) {
if (guessCounter == progress) {
if (progress == pattern.length - 1) {
winGame();
} else {
progress++;
playClueSequence();
}
} else {
guessCounter++;
}
} else {
loseGame();
}
}
function loseGame() {
stopGame();
alert("Game Over! You lost.");
}
function winGame() {
stopGame();
alert("Yay!! You win!");
}