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BangleApps/apps/thunder/app.js

125 lines
2.9 KiB
JavaScript

Bangle.loadWidgets();
g.clear(true);
Bangle.drawWidgets();
Bangle.setLCDTimeout(undefined);
let renderIntervalId;
let startTime;
const locale = require("locale");
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:atob("DhoBH+B/gf4P8D/A/gP4H+B/AfwH8B//////7/+A/APwD4A+APADwA4AcAHABgAYAA==") },
{type:"btn", font:"6x8:2", label:"Boom", cb: l=>boom() }
]},
]
}, {
lazy: true,
back: load,
});
// TODO The code in this function appears in various apps so it might be
// nice to add something to the time_utils module. (There is already a
// formatDuration function but that doesn't quite work the same way.)
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 === 1) {
let kms = Math.round((secs / 2.91) * 10) / 10;
distance = kms.toFixed(1) + "km";
} else if (settings.units === 2) {
let miles = Math.round((secs / 4.69) * 10) / 10;
distance = miles.toFixed(1) + "mi";
} else {
let meters = (secs / 2.91) * 1000;
distance = locale.distance(meters);
}
return distance;
};
const renderIntervalCallback = function() {
if (startTime === undefined) {
return;
}
updateTimeAndDistance();
};
const flashAndBoom = function() {
Bangle.buzz(50, 0.5);
if (renderIntervalId !== undefined) {
clearInterval(renderIntervalId);
renderIntervalId = undefined;
}
};
const flash = function() {
flashAndBoom();
startTime = undefined;
updateTimeAndDistance();
startTime = Date.now();
renderIntervalId = setInterval(renderIntervalCallback, 100);
};
const boom = function() {
flashAndBoom();
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();