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Start trying to do some PWA action

This commit is contained in:
Neale Pickett 2018-11-21 20:19:31 +00:00
parent 9ca3b8ac9d
commit b24a63b5c8
6 changed files with 142 additions and 104 deletions
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4
_layouts/default.html
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@ -9,6 +9,9 @@
<link rel="icon" type="image/png" href="{{ '/assets/images/face.png' | relative_url }}"> <link rel="icon" type="image/png" href="{{ '/assets/images/face.png' | relative_url }}">
{% if page.scripts %}{% for js_file in page.scripts %} {% if page.scripts %}{% for js_file in page.scripts %}
<script src="{{ js_file }}"></script> <script src="{{ js_file }}"></script>
{% endfor %}{% endif %}
{% if page.headers %}{% for header in page.headers %}
{{ header }}
{% endfor %}{% endif %} {% endfor %}{% endif %}
<title>{{ page.title }}</title> <title>{{ page.title }}</title>
</head> </head>
@ -37,6 +40,7 @@
<ul> <ul>
<li><a href="https://github.com/nealey/">GitHub</a></li> <li><a href="https://github.com/nealey/">GitHub</a></li>
<li><a href="mailto:neale@woozle.org">Email</a></li> <li><a href="mailto:neale@woozle.org">Email</a></li>
</ul>
</nav> </nav>
</footer> </footer>

17
assets/css/default.css
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@ -14,18 +14,19 @@ body {
padding: 1em; padding: 1em;
border-radius: 1em; border-radius: 1em;
max-width: 35em; max-width: 35em;
font-family: "Roboto", sans-serif; font-family: "Lato", "Roboto", sans-serif;
} }
#title, td.main { #title, td.main {
background-color: #e0e4cc; background-color: #e0e4cc;
border-radius: 0.5em; border-radius: 0.25em;
padding: 0em 1em; padding: 0.1em 0.5em;
margin-top: 0; margin-top: 0;
box-shadow: 0.2em 0.2em 1em rgba(0,0,0,0.1);
} }
h1, h2, h3, h4, h5, h6 { h1, h2, h3, h4, h5, h6 {
color: #fa6900; color: #e64;
} }
a { a {
@ -117,3 +118,11 @@ pre {
font-size: small; font-size: small;
text-indent: inherit; text-indent: inherit;
} }
button.big {
padding: 0;
border: 0;
margin: 1em;
font-size: 2em;
background: inherit;
}

122
toys/starship/index.html
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@ -1,13 +1,9 @@
<!DOCTYPE html> ---
<html lang="en-US"> title: Starship Noise Generator
<head> scripts:
<meta charset='utf-8'> - starship.js
<meta name="viewport" content="width=device-width"> ---
<link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Roboto:regular,bold,italic">
<link rel="stylesheet" media="screen" href="/assets/css/default.css">
<link rel="icon" href="icon.svg">
<link rel="manifest" href="manifest.webmanifest">
<style>
#play { #play {
padding: 0; padding: 0;
border: 0; border: 0;
@ -15,97 +11,23 @@
font-size: 2em; font-size: 2em;
background: inherit; background: inherit;
} }
</style> <div>
<button id="play">⏯️</button>
🔉
<input id="fader" type="range" min="0" max="10" step="0.01" />
🔊
</div>
<title>Starship Noise Generator</title> I work in a building with no HVAC,
<script> which means we can hear <em>everything</em> people are saying,
function whiteNoise(audioCtx) { anywhere in the building.
var bufferSize = 17 * audioCtx.sampleRate,
noiseBuffer = audioCtx.createBuffer(1, bufferSize, audioCtx.sampleRate),
output = noiseBuffer.getChannelData(0);
for (var i = 0; i < bufferSize; i++) {
output[i] = Math.random() * 2 - 1;
}
var whiteNoise = audioCtx.createBufferSource();
whiteNoise.buffer = noiseBuffer;
whiteNoise.loop = true;
whiteNoise.start(0);
return whiteNoise;
}
function bandpassFilter(audioCtx, freq, gain) { This page is a low-CPU noise generator that runs entirely in JavaScript.
var filt = audioCtx.createBiquadFilter(); Once it starts,
filt.type = "bandpass"; you don’t need an Internet connection to keep it going.
filt.frequency.value = freq; You can leave it running forever, if you like.
filt.gain.value = gain;
return filt;
}
function init() {
var audioCtx = new window.AudioContext();
var synth = whiteNoise(audioCtx);
var filterA = bandpassFilter(audioCtx, 100, 20);
var filterB = bandpassFilter(audioCtx, 50, 20);
var gainA = audioCtx.createGain();
whiteNoise(audioCtx).connect(filterA);
filterA.connect(filterB);
filterB.connect(gainA);
gainA.connect(audioCtx.destination);
audioCtx.suspend();
function setFade() {
var faderPos = document.querySelector("#fader").value;
gainA.gain.value = faderPos;
}
document.querySelector("#fader").addEventListener("input", setFade);
setFade();
document.querySelector("#play").addEventListener("click", e => {
console.log(audioCtx.state);
if (audioCtx.state == 'running') {
audioCtx.suspend();
} else {
audioCtx.resume();
}
});
}
if (document.readyState === "loading") {
document.addEventListener("DOMContentLoaded", init);
} else {
init();
}
</script>
</head>
<body>
<h1 id="title">
<span>Starship Noise Generator</span>
</h1>
<main id="content">
<div>
<button id="play">⏯️</button>
🔉
<input id="fader" type="range" min="0" max="10" step="0.01" />
🔊
</div>
<p>I work in a building with no HVAC,
which means we can hear <em>everything</em> people are saying,
anywhere in the building.</p>
<p>This page is a low-CPU noise generator that runs entirely in JavaScript.
Once it starts,
you don’t need an Internet connection to keep it going.
You can leave it running forever, if you like.</p>
<p>For those interested,
it uses the new (in 2017) and seriously perfect for this application
<a href="https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API">Web Audio API</a>.</p>
</main>
</body>
</html>
For those interested,
it uses the new (in 2017) and seriously perfect for this application
[Web Audio API](https://developer.mozilla.org/en-US/docs/Web/API/Web_Audio_API)

15
toys/starship/manifest.json Normal file
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@ -0,0 +1,15 @@
{
"name": "Starship Noise Generator",
"short_name": "Starship",
"start_url": ".",
"display": "standalone",
"background_color": "#fff",
"description": "Generates brown noise similar to a futuristic starship engine (or a modern HVAC system)",
"icons": [
{
"src": "icon.svg",
"sizes": "any"
}
]
}

62
toys/starship/starship.js Normal file
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@ -0,0 +1,62 @@
function whiteNoise(audioCtx) {
var bufferSize = 17 * audioCtx.sampleRate,
noiseBuffer = audioCtx.createBuffer(1, bufferSize, audioCtx.sampleRate),
output = noiseBuffer.getChannelData(0);
for (var i = 0; i < bufferSize; i++) {
output[i] = Math.random() * 2 - 1;
}
var whiteNoise = audioCtx.createBufferSource();
whiteNoise.buffer = noiseBuffer;
whiteNoise.loop = true;
whiteNoise.start(0);
return whiteNoise;
}
function bandpassFilter(audioCtx, freq, gain) {
var filt = audioCtx.createBiquadFilter();
filt.type = "bandpass";
filt.frequency.value = freq;
filt.gain.value = gain;
return filt;
}
function init() {
var audioCtx = new window.AudioContext();
var synth = whiteNoise(audioCtx);
var filterA = bandpassFilter(audioCtx, 100, 20);
var filterB = bandpassFilter(audioCtx, 50, 20);
var gainA = audioCtx.createGain();
whiteNoise(audioCtx).connect(filterA);
filterA.connect(filterB);
filterB.connect(gainA);
gainA.connect(audioCtx.destination);
audioCtx.suspend();
function setFade() {
var faderPos = document.querySelector("#fader").value;
gainA.gain.value = faderPos;
}
document.querySelector("#fader").addEventListener("input", setFade);
setFade();
document.querySelector("#play").addEventListener("click", e => {
if (audioCtx.state == "running") {
audioCtx.suspend();
} else {
audioCtx.resume();
}
});
console.log(navigator.serviceWorker);
console.log("moo");
if ("serviceWorker" in navigator) {
navigator.serviceWorker.register("sw.js");
}
}
if (document.readyState === "loading") {
document.addEventListener("DOMContentLoaded", init);
} else {
init();
}

26
toys/starship/sw.js Normal file
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@ -0,0 +1,26 @@
var cacheName = "starship-v1";
var content = [
"index.html",
"starship.js"
];
self.addEventListener("install", e => {
e.waitUntil(caches.Open(cacheName).then(cache => cache.addAll(content)));
});
// Have mercy, this is a horror show
self.addEventListener("fetch", e => {
e.respondWith(
caches.match(e.request).then(r => {
console.log("[Service Worker] Fetching resource:", e.request.url);
return r || fetch(e.request).then(response => {
return caches.open(cacheName).then(cache => {
console.log("[Service Worker] Caching new resource:", e.request.url);
cache.put(e.request, respone.clone());
return response;
});
});
})
);
});