mirror of https://github.com/espruino/BangleApps
100 lines
3.3 KiB
JavaScript
100 lines
3.3 KiB
JavaScript
(() => {
|
|
|
|
var lastCalculated = 0; // When we last calculated the phase
|
|
var phase = 0; // The last phase we calculated
|
|
var southernHemisphere = false; // when in southern hemisphere -- use the "My Location" App
|
|
|
|
// https://deirdreobyrne.github.io/calculating_moon_phases/
|
|
function moonPhase(millis) {
|
|
k = (millis - 946728000000) / 3155760000000;
|
|
mp = (8328.69142475915 * k) + 2.35555563685;
|
|
m = (628.30195516723 * k) + 6.24006012726;
|
|
d = (7771.37714483372 * k) + 5.19846652984;
|
|
t = d + (0.109764 * Math.sin (mp)) - (0.036652 * Math.sin(m)) + (0.022235 * Math.sin(d+d-mp)) + (0.011484 * Math.sin(d+d)) + (0.003735 * Math.sin(mp+mp)) + (0.00192 * Math.sin(d));
|
|
k = (1 - Math.cos(t))/2;
|
|
if (Math.sin(t) < 0) {
|
|
k = -k;
|
|
}
|
|
return (k); // Goes 0 -> 1 for waxing, and from -1 -> 0 for waning
|
|
}
|
|
|
|
function loadLocation() {
|
|
// "mylocation.json" is created by the "My Location" app
|
|
location = require("Storage").readJSON("mylocation.json",1)||{"lat":50.1236,"lon":8.6553,"location":"Frankfurt"};
|
|
southernHemisphere = (location.lat < 0);
|
|
}
|
|
|
|
// code source: github.com/rozek/banglejs-2-activities/blob/main/README.md#drawmoonphase
|
|
function drawMoonPhase (CenterX,CenterY, Radius, leftFactor,rightFactor) {
|
|
let x = Radius, y = 0, Error = Radius;
|
|
g.drawLine(CenterX-leftFactor*x,CenterY, CenterX+rightFactor*x,CenterY);
|
|
let dx,dy;
|
|
while (y <= x) {
|
|
dy = 1 + 2*y; y++; Error -= dy;
|
|
if (Error < 0) {
|
|
dx = 1 - 2*x; x--; Error -= dx;
|
|
}
|
|
g.drawLine(CenterX-leftFactor*x,CenterY-y, CenterX+rightFactor*x,CenterY-y);
|
|
g.drawLine(CenterX-leftFactor*x,CenterY+y, CenterX+rightFactor*x,CenterY+y);
|
|
g.drawLine(CenterX-leftFactor*y,CenterY-x, CenterX+rightFactor*y,CenterY-x);
|
|
g.drawLine(CenterX-leftFactor*y,CenterY+x, CenterX+rightFactor*y,CenterY+x);
|
|
}
|
|
}
|
|
|
|
function setMoonColour(g) {
|
|
var settings = Object.assign({
|
|
default_colour: true,
|
|
red: 0,
|
|
green: 0,
|
|
blue: 0,
|
|
}, require('Storage').readJSON("widmp.json", true) || {});
|
|
if (settings.default_colour) {
|
|
if (g.theme.dark) {
|
|
g.setColor(0xffff); // white
|
|
} else {
|
|
// rrrrrggggggbbbbb
|
|
// 0000010000011111
|
|
g.setColor(0x41f); // blue-ish
|
|
}
|
|
} else {
|
|
g.setColor(settings.red/4, settings.green/4, settings.blue/4);
|
|
}
|
|
}
|
|
|
|
|
|
function draw() {
|
|
const CenterX = this.x + 12, CenterY = this.y + 12, Radius = 11;
|
|
|
|
loadLocation();
|
|
g.reset().setColor(g.theme.bg);
|
|
g.fillRect(CenterX - Radius, CenterY - Radius, CenterX + Radius, CenterY + Radius);
|
|
|
|
millis = (new Date()).getTime();
|
|
if ((millis - lastCalculated) >= 7000000) { // if it's more than 7,000 sec since last calculation, re-calculate!
|
|
phase = moonPhase(millis);
|
|
lastCalculated = millis;
|
|
}
|
|
|
|
if (phase < 0) { // waning - phase goes from -1 to 0
|
|
leftFactor = 1;
|
|
rightFactor = -1 - 2*phase;
|
|
} else { // waxing - phase goes from 0 to 1
|
|
rightFactor = 1;
|
|
leftFactor = -1 + 2*phase;
|
|
}
|
|
if (true == southernHemisphere) {
|
|
var tmp=leftFactor; leftFactor=rightFactor; rightFactor=tmp;
|
|
}
|
|
|
|
setMoonColour(g);
|
|
drawMoonPhase(CenterX,CenterY, Radius, leftFactor,rightFactor);
|
|
}
|
|
|
|
WIDGETS["widmp"] = {
|
|
area: "tr",
|
|
width: 24,
|
|
draw: draw
|
|
};
|
|
|
|
})();
|