Add new thunder app

Signed-off-by: James Taylor <jt-git@nti.me.uk>

apps/thunder/ChangeLog

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+0.01: New App!

apps/thunder/README.md

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+# Come on Thunder
+
+Simple timer to calculate how far away lightning is.
+
+A tribute to [Flash Boom](https://archive.org/details/tucows_33513_Flash_Boom), the greatest app of all time!
+
+![](screenshot.png)
+
+## Usage
+
+Use the "Flash" button when you see the flash of lightning, and press the "Boom" button when you hear the rumble of thunder!
+
+## Creator
+
+James Taylor ([jt-nti](https://github.com/jt-nti))
+
+## Icons
+
+- [Cloud Lightning](https://icons8.com/icon/41144/cloud-lightning)
+- [Lightning](https://icons8.com/icon/60998/lightning-bolt")

apps/thunder/app-icon.js

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+require("heatshrink").decompress(atob("mEwgn/AH4AO/uEkETxoWR/1QN4deC6HBgN89/suMB54WO/gqFsEcC53hg4GE/ECC51Qr4HFsF/RhsB94IF+MPC5n4IwoAB+8HscRk2vC5Hzhh/IAAUC34XH+UOBI8Dzv/7MwHo//+BWIYAf6gB9F/tziBuN4ELTgpSBI5AAE/TGE+kBvv/NJAAFmAPDsEtchwAByFvaYffC6HQl7KDKo5mBx6fHj7TChokHgEIW5AXC+KjHkAuII4gXH+ouJO4hHHwAuJU4h3G/YuKa4inG8IuK4ELAodwa4kwUoMAz6qCLIX5gF/CIf0gN8AgP2CwUKVQUGBQPZmDRGuASBp4FB2EB56qCt/0BgMCOoQAD/tziAXCkEdVQQuBHoMmCwwAF+0C96qCLoQAO4E+//8LoYAPmiqDFyP4r6qFUIgAK66qFhIvPUYJjDgGvMCLzDjYWU/EB74XU6EuCyn/oYWV/NPC6vnCyqqFAH4A//4A=="))

apps/thunder/app.js

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+Bangle.loadWidgets();
+g.clear(true);
+Bangle.drawWidgets();
+
+Bangle.setLCDTimeout(undefined);
+
+let renderIntervalId;
+let startTime;
+
+const DEFAULTS = {
+  units: 0,
+};
+
+const settings = require("Storage").readJSON("thunder.json", 1) || DEFAULTS;
+
+var Layout = require("Layout");
+var layout = new Layout( {
+  type:"v", c: [
+    {type:"txt", font:"6x8:2", label:"", id:"time", fillx:1},
+    {type:"txt", pad:8, font:"20%", label:"", id:"distance", fillx:1},
+    {type:"h", c: [
+      {type:"btn", font:"6x8:2", label:"Flash", cb: l=>flash() },
+      {type:"img", pad:4, src:require("heatshrink").decompress(atob("h0awkBiMQBAQFBAxwdDAoIGKCYQGGFBQTCAyIAPgIGGIAoFCAxITDAxIFDAxATEJwIMEAw4TEAwo")) },
+      {type:"btn", font:"6x8:2", label:"Boom", cb: l=>boom() }
+    ]},
+  ]
+}, {
+  lazy: true,
+  back: load,
+});
+
+const getTime = function(milliseconds) {
+  let hrs = Math.floor(milliseconds/3600000);
+  let mins = Math.floor(milliseconds/60000)%60;
+  let secs = Math.floor(milliseconds/1000)%60;
+  let tnth = Math.floor(milliseconds/100)%10;
+  let text;
+
+  if (hrs === 0) {
+    text = ("0"+mins).slice(-2) + ":" + ("0"+secs).slice(-2) + "." + tnth;
+  } else {
+    text = ("0"+hrs) + ":" + ("0"+mins).slice(-2) + ":" + ("0"+secs).slice(-2);
+  }
+
+  return text;
+};
+
+// Convert milliseconds to distance based on one km in 2.91 s or
+// one mile in 4.69 s
+// See https://en.wikipedia.org/wiki/Speed_of_sound
+const getDistance = function(milliseconds) {
+  let secs = milliseconds/1000;
+  let distance;
+
+  if (settings.units === 0) {
+    let kms = Math.round((secs / 2.91) * 10) / 10;
+    distance = kms.toFixed(1) + "km";
+  } else {
+    let miles = Math.round((secs / 4.69) * 10) / 10;
+    distance = miles.toFixed(1) + "mi";
+  }
+
+  return distance;
+};
+
+const renderIntervalCallback = function() {
+  if (startTime === undefined) {
+    return;
+  }
+
+  updateTimeAndDistance();
+};
+
+const flash = function() {
+  Bangle.buzz(50, 0.5);
+  
+  startTime = startTime = Date.now();
+  updateTimeAndDistance();
+  renderIntervalId = setInterval(renderIntervalCallback, 100);
+};
+
+const boom = function() {
+  Bangle.buzz(50, 0.5);
+
+  if (renderIntervalId !== undefined) {
+    clearInterval(renderIntervalId);
+    renderIntervalId = undefined;
+  }
+  
+  updateTimeAndDistance();
+  startTime = undefined;
+};
+
+const updateTimeAndDistance = function() {
+  let t;
+
+  if (startTime === undefined) {
+    t = 0;
+  } else {
+    t = Date.now() - startTime;
+  }
+
+  layout.time.label = getTime(t);
+  layout.distance.label = getDistance(t);
+
+  layout.render();
+  // layout.debug();
+};
+
+updateTimeAndDistance();

apps/thunder/metadata.json

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+{ "id": "thunder",
+  "name": "Come on Thunder",
+  "shortName":"Thunder",
+  "version":"0.01",
+  "description": "Simple timer to calculate how far away lightning is",
+  "icon": "app.png",
+  "tags": "tool,weather",
+  "supports" : ["BANGLEJS2"],  
+  "readme": "README.md",
+  "allow_emulator": true,
+  "storage": [
+    {"name":"thunder.app.js","url":"app.js"},
+    {"name":"thunder.settings.js","url":"settings.js"},
+    {"name":"thunder.img","url":"app-icon.js","evaluate":true}
+  ],
+  "data": [{"name":"thunder.json"}]
+}

apps/thunder/settings.js

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+(function (back) {
+  const FILE = "thunder.json";
+  const DEFAULTS = {
+    units: 0,
+  };
+
+  let settings = {};
+
+  const loadSettings = function() {
+    settings = require('Storage').readJSON(FILE, 1) || DEFAULTS;
+  };
+
+  const saveSettings = function() {
+    require('Storage').writeJSON(FILE, settings);
+  };
+
+  const showMenu = function() {
+    const unitOptions = ['kms','miles'];
+
+    const menu = {
+      '': {'title': 'Thunder'},
+      '< Back': back,
+      'Units': {
+        value: 0|settings.units,
+        min: 0,
+        max: unitOptions.length-1,
+        format: v => unitOptions[v],
+        onchange: v => {
+          settings.units = 0 | v;
+          saveSettings(settings);
+        }
+      },
+    };
+
+    E.showMenu(menu);
+  };
+
+  loadSettings();
+  showMenu();
+});