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Added user data for lat/lon.

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This commit is contained in:
Nissim Hadar 2018-01-08 11:50:49 -08:00
parent d0c0d6a388
commit 8e03ecedb9
1 changed files with 49 additions and 18 deletions
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67
scripts/developer/sunModel.js
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@ -19,14 +19,6 @@
return angle_rads * (180.0 / Math.PI);
}
// Parameters
var latitude_degs = 47.751033;
var longitude_degs = -122.228176;
// These are used a lot
var latitude = toRadians(latitude_degs);
var longitude = toRadians(longitude_degs);
// Code to check if Daylight Savings is active
Date.prototype.stdTimezoneOffset = function() {
var fy = this.getFullYear();
@ -55,9 +47,10 @@
};
// The Julian Date is the number of days (fractional) that have elapsed since Jan 1st, 4713 BC
function getJulianDate(dateTime) {
// See https://quasar.as.utexas.edu/BillInfo/JulianDatesG.html
function getJulianDay(dateTime) {
var month = dateTime.getMonth() + 1;
var day = dateTime.getDate() + 1;
var day = dateTime.getDate() + 1;
var year = dateTime.getFullYear();
if (month <= 2) {
@ -150,6 +143,11 @@
}
function calcEquationOfTime(t) {
// Converts from "mean" solar day (i.e. days that are exactly 24 hours)
// to apparent solar day (as observed)
// This is essentially the east-west component of the analemma.
//
// This is caused by 2 effects: the obliquity of the ecliptic, the eccentricity of earth's orbit
var epsilon = calcObliquityCorrection(t);
var l0 = calcGeomMeanLongSun(t);
var e = calcEccentricityEarthOrbit(t);
@ -164,7 +162,9 @@
var sin4l0 = Math.sin(4.0 * toRadians(l0));
var sin2m = Math.sin(2.0 * toRadians(m));
var Etime = y * sin2l0 - 2.0 * e * sinm + 4.0 * e * y * sinm * cos2l0 - 0.5 * y * y * sin4l0 - 1.25 * e * e * sin2m;
var Etime = y * sin2l0 - 2.0 * e * sinm + 4.0 * e * y * sinm * cos2l0 -
0.5 * y * y * sin4l0 - 1.25 * e * e * sin2m;
return toDegrees(Etime) * 4.0; // in minutes of time
}
@ -181,22 +181,53 @@
var R = (1.000001018 * (1 - e * e)) / (1 + e * Math.cos(toRadians(v)));
return R; // in AUs
}
function parseJSON(json) {
try {
return JSON.parse(json);
} catch (e) {
return undefined;
}
}
var COMPUTATION_CYCLE = 5000; // Run every 5 seconds
this.preload = function(entityID) { // You don't have the entityID before the preload
this.preload = function(entityID) { // We don't have the entityID before the preload
// Define user data
var userDataProperties = {
"userData": "{ \"latitude\": 47.0, \"longitude\": 122.0 }"
};
Entities.editEntity(entityID, userDataProperties);
Script.setInterval(
function() {
// Read back user data
var userData = Entities.getEntityProperties(entityID, 'userData').userData;
var data = parseJSON(userData);
var latitude_degs = data.latitude;
var longitude_degs = data.longitude;
// These are used a lot
var latitude = toRadians(latitude_degs);
var longitude = toRadians(longitude_degs);
var dateTime = new Date();
var julianDay = getJulianDate(dateTime);
var julianDay = getJulianDay(dateTime);
var localTimeMinutes = getMinutes(dateTime);
var timeZone = -dateTime.getTimezoneOffset() / 60;
var totalTime = julianDay + localTimeMinutes/1440.0 - timeZone / 24.0;
var julianCentralTime = (julianDay - 2451545.0)/36525.0;
var eqTime = calcEquationOfTime(julianCentralTime)
var theta_rads = toRadians(calcSunDeclination(julianCentralTime));
// J2000.0 is the epoch starting Jan 1st, 2000 (noon), expressed as a Julian day
var J2000 = 2451545.0
// Number of years that have passed since J2000.0
var julianDayModified = (J2000 - 2451545.0)/36525.0;
var eqTime = calcEquationOfTime(julianDayModified)
var theta_rads = toRadians(calcSunDeclination(julianDayModified));
var solarTimeFix = eqTime + 4.0 * longitude_degs - 60.0 * timeZone;
var earthRadVec = calcSunRadVector(julianCentralTime);
var earthRadVec = calcSunRadVector(julianDayModified);
var trueSolarTime = localTimeMinutes + solarTimeFix;
while (trueSolarTime > 1440) {