kopia lustrzana https://gitlab.com/gridtracker.org/gridtracker
456 wiersze
12 KiB
JavaScript
456 wiersze
12 KiB
JavaScript
/**
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**/
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(function (global, factory)
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{
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typeof exports === "object" && typeof module !== "undefined"
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? (module.exports = factory())
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: typeof define === "function" && define.amd
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? define(factory)
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: (global.GeoJSONTerminator = factory());
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})(this, function ()
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{
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"use strict";
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function julian(date)
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{
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/* Calculate the present UTC Julian Date. Function is valid after
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* the beginning of the UNIX epoch 1970-01-01 and ignores leap
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* seconds. */
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return date / 86400000 + 2440587.5;
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}
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function GMST(julianDay)
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{
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/* Calculate Greenwich Mean Sidereal Time according to
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http://aa.usno.navy.mil/faq/docs/GAST.php */
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var d = julianDay - 2451545.0;
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// Low precision equation is good enough for our purposes.
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return (18.697374558 + 24.06570982441908 * d) % 24;
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}
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class Terminator
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{
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constructor(options = { resolution: 1 })
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{
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this.options = options;
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this.version = "0.1.0";
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this._R2D = 180 / Math.PI;
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this._D2R = Math.PI / 180;
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// this.options.resolution = options.resolution || this.options.resolution;
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// this.options.time = options.time;
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var latLngs = this._compute(this.options.time);
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return this._toGeoJSON(latLngs);
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}
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setTime(date)
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{
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this.options.time = date;
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var latLngs = this._compute(date);
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return this._toGeoJSON(latLngs);
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}
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_toGeoJSON(latLngs)
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{
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/* Return 'pseudo' GeoJSON representation of the coordinates
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Why 'pseudo'?
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Coordinates longitude range go from -360 to 360
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whereas it should be -180, + 180
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API like OpenLayers or Leaflet can consume them although invalid
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from GeoJSON spec
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In this case, use something like GDAL/OGR to clip to a valid range with
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ogr2ogr -f "GeoJSON" output.geojson input.geojson \
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-clipsrc -180 90 180 90
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*/
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return {
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type: "Feature",
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properties: {},
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geometry: {
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type: "Polygon",
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coordinates: [
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[
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...latLngs.map((latLng) =>
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{
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return [latLng[1], latLng[0]];
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}),
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[latLngs[0][1], latLngs[0][0]]
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]
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.slice()
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.reverse()
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]
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}
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};
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}
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_sunEclipticPosition(julianDay)
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{
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/* Compute the position of the Sun in ecliptic coordinates at
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julianDay. Following
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http://en.wikipedia.org/wiki/Position_of_the_Sun */
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// Days since start of J2000.0
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var n = julianDay - 2451545.0;
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// mean longitude of the Sun
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var L = 280.46 + 0.9856474 * n;
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L %= 360;
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// mean anomaly of the Sun
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var g = 357.528 + 0.9856003 * n;
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g %= 360;
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// ecliptic longitude of Sun
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var lambda =
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L +
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1.915 * Math.sin(g * this._D2R) +
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0.02 * Math.sin(2 * g * this._D2R);
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return { lambda: lambda };
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}
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_eclipticObliquity(julianDay)
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{
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// Following the short term expression in
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// http://en.wikipedia.org/wiki/Axial_tilt#Obliquity_of_the_ecliptic_.28Earth.27s_axial_tilt.29
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var n = julianDay - 2451545.0;
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// Julian centuries since J2000.0
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var T = n / 36525;
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var epsilon =
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23.43929111 -
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T *
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(46.836769 / 3600 -
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T *
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(0.0001831 / 3600 +
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T *
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(0.0020034 / 3600 -
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T * (0.576e-6 / 3600 - (T * 4.34e-8) / 3600))));
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return epsilon;
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}
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_jday(date)
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{
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return date.getTime() / 86400000.0 + 2440587.5;
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}
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_calculatePositionOfSun(date)
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{
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date = date instanceof Date ? date : new Date();
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var rad = 0.017453292519943295;
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// based on NOAA solar calculations
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var ms_past_midnight =
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((date.getUTCHours() * 60 + date.getUTCMinutes()) * 60 +
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date.getUTCSeconds()) *
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1000 +
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date.getUTCMilliseconds();
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var jc = (this._jday(date) - 2451545) / 36525;
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var mean_long_sun =
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(280.46646 + jc * (36000.76983 + jc * 0.0003032)) % 360;
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var mean_anom_sun = 357.52911 + jc * (35999.05029 - 0.0001537 * jc);
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var sun_eq =
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Math.sin(rad * mean_anom_sun) *
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(1.914602 - jc * (0.004817 + 0.000014 * jc)) +
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Math.sin(rad * 2 * mean_anom_sun) * (0.019993 - 0.000101 * jc) +
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Math.sin(rad * 3 * mean_anom_sun) * 0.000289;
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var sun_true_long = mean_long_sun + sun_eq;
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var sun_app_long =
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sun_true_long -
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0.00569 -
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0.00478 * Math.sin(rad * 125.04 - 1934.136 * jc);
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var mean_obliq_ecliptic =
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23 +
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(26 + (21.448 - jc * (46.815 + jc * (0.00059 - jc * 0.001813))) / 60) /
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60;
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var obliq_corr =
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mean_obliq_ecliptic + 0.00256 * Math.cos(rad * 125.04 - 1934.136 * jc);
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var lat =
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Math.asin(Math.sin(rad * obliq_corr) * Math.sin(rad * sun_app_long)) /
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rad;
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var eccent = 0.016708634 - jc * (0.000042037 + 0.0000001267 * jc);
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var y =
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Math.tan(rad * (obliq_corr / 2)) * Math.tan(rad * (obliq_corr / 2));
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var rq_of_time =
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4 *
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((y * Math.sin(2 * rad * mean_long_sun) -
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2 * eccent * Math.sin(rad * mean_anom_sun) +
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4 *
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eccent *
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y *
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Math.sin(rad * mean_anom_sun) *
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Math.cos(2 * rad * mean_long_sun) -
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0.5 * y * y * Math.sin(4 * rad * mean_long_sun) -
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1.25 * eccent * eccent * Math.sin(2 * rad * mean_anom_sun)) /
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rad);
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var true_solar_time_in_deg =
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((ms_past_midnight + rq_of_time * 60000) % 86400000) / 240000;
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var lng = -(true_solar_time_in_deg < 0
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? true_solar_time_in_deg + 180
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: true_solar_time_in_deg - 180);
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return [lng, lat];
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}
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_sunEquatorialPosition(sunEclLng, eclObliq)
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{
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/* Compute the Sun's equatorial position from its ecliptic
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* position. Inputs are expected in degrees. Outputs are in
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* degrees as well. */
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var alpha =
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Math.atan(
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Math.cos(eclObliq * this._D2R) * Math.tan(sunEclLng * this._D2R)
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) * this._R2D;
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var delta =
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Math.asin(
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Math.sin(eclObliq * this._D2R) * Math.sin(sunEclLng * this._D2R)
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) * this._R2D;
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var lQuadrant = Math.floor(sunEclLng / 90) * 90;
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var raQuadrant = Math.floor(alpha / 90) * 90;
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alpha = alpha + (lQuadrant - raQuadrant);
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return { alpha: alpha, delta: delta };
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}
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_hourAngle(lng, sunPos, gst)
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{
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/* Compute the hour angle of the sun for a longitude on
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* Earth. Return the hour angle in degrees. */
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var lst = gst + lng / 15;
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return lst * 15 - sunPos.alpha;
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}
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_latitude(ha, sunPos)
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{
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/* For a given hour angle and sun position, compute the
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* latitude of the terminator in degrees. */
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var lat =
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Math.atan(
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-Math.cos(ha * this._D2R) / Math.tan(sunPos.delta * this._D2R)
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) * this._R2D;
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return lat;
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}
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_compute(time)
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{
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var today = time ? new Date(time) : new Date();
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var julianDay = julian(today);
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var gst = GMST(julianDay);
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var latLng = [];
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var startMinus = -360;
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var sunEclPos = this._sunEclipticPosition(julianDay);
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var eclObliq = this._eclipticObliquity(julianDay);
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var sunEqPos = this._sunEquatorialPosition(sunEclPos.lambda, eclObliq);
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for (var i = 0; i <= 720 * this.options.resolution; i++)
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{
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var lng = startMinus + i / this.options.resolution;
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var ha = this._hourAngle(lng, sunEqPos, gst);
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latLng[i + 1] = [this._latitude(ha, sunEqPos), lng];
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}
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if (sunEqPos.delta < 0)
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{
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latLng[0] = [90, startMinus];
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latLng[latLng.length] = [90, 360];
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}
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else
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{
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latLng[0] = [-90, startMinus];
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latLng[latLng.length] = [-90, 360];
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}
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return latLng;
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}
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}
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function terminator(options)
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{
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return new Terminator(options);
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}
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return terminator;
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});
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var dayNight = {
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map: null,
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vectorLayer: null,
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init: function (map)
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{
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this.map = map;
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var geoJSON = new GeoJSONTerminator();
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this.vectorSource = new ol.source.Vector({
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features: new ol.format.GeoJSON().readFeatures(geoJSON, {
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featureProjection: "EPSG:3857"
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})
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});
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this.vectorLayer = new ol.layer.Vector({
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source: this.vectorSource,
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style: new ol.style.Style({
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fill: new ol.style.Fill({
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color: "rgb(0,0,0)"
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}),
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stroke: null
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}),
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opacity: Number(GT.mapSettings.shadow),
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zIndex: 0
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});
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this.map.getLayers().insertAt(1, this.vectorLayer);
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},
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refresh: function ()
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{
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var circleStyle = new ol.style.Style({
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fill: new ol.style.Fill({
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color: "rgb(0,0,0)"
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})
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});
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this.vectorLayer.setStyle(circleStyle);
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this.vectorLayer.setOpacity(Number(GT.mapSettings.shadow));
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this.vectorSource.clear();
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this.vectorSource.addFeature(
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new ol.format.GeoJSON().readFeature(new GeoJSONTerminator(), {
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featureProjection: "EPSG:3857"
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})
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);
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var point = ol.proj.fromLonLat([GT.myLon, GT.myLat]);
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var arr = this.vectorSource.getFeaturesAtCoordinate(point);
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return arr.length > 0;
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},
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show: function ()
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{
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this.vectorLayer.setVisible(true);
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return this.refresh();
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},
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hide: function ()
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{
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this.vectorLayer.setVisible(false);
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},
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isVisible: function ()
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{
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return this.vectorLayer.getVisible();
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}
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};
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var moonLayer = {
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map: null,
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vectorLayer: null,
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icon: null,
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pin: null,
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init: function (map)
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{
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this.map = map;
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this.icon = new ol.style.Icon({
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src: "./img/luna.png",
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anchorYUnits: "pixels",
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anchorXUnits: "pixels",
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anchor: [255, 255],
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scale: 0.1,
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opacity: 0.5
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});
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this.pin = iconFeature(
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ol.proj.fromLonLat(subLunar(timeNowSec()).ll),
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this.icon,
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0
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);
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this.pin.size = 99;
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this.vectorSource = new ol.source.Vector({});
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this.vectorLayer = new ol.layer.Vector({
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source: this.vectorSource,
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zIndex: 30
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});
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this.map.getLayers().insertAt(1, this.vectorLayer);
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},
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future: function (now)
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{
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var r = 0;
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var x = 25;
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var i = 3600;
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var data = Array();
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for (r = 0; r < x; r++)
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{
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data.push(subLunar(now + r * i).ll);
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}
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line = [];
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var lonOff = 0;
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var lastc = 0;
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for (var i = 0; i < data.length; i++)
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{
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var c = data[i];
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if (isNaN(c[0]))
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{
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continue;
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}
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if (Math.abs(lastc - c[0]) > 270)
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{
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// Wrapped
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if (c[0] < lastc)
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{
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lonOff += 360;
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}
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else
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{
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lonOff -= 360;
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}
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}
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lastc = c[0];
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line.push(ol.proj.fromLonLat([c[0] + lonOff, c[1]]));
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}
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if (line.length == 0)
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{
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line.push(ol.proj.fromLonLat(start));
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}
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line = new ol.geom.LineString(line);
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var feature = new ol.Feature({ geometry: line, name: "moonFlight" });
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feature.setStyle(
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new ol.style.Style({
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stroke: new ol.style.Stroke({ color: "#FFF", width: 1 })
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})
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);
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return feature;
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},
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refresh: function ()
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{
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this.vectorSource.clear();
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if (GT.appSettings.moonTrack == 1)
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{
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now = timeNowSec();
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if (GT.appSettings.moonPath == 1)
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{ this.vectorSource.addFeature(this.future(now)); }
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this.pin = iconFeature(
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ol.proj.fromLonLat(subLunar(now).ll),
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this.icon,
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0
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);
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this.pin.size = 99;
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this.vectorSource.addFeature(this.pin);
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}
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},
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show: function ()
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{
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this.refresh();
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this.vectorLayer.setVisible(true);
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lunaButonImg.style.webkitFilter = "brightness(100%)";
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},
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hide: function ()
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{
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this.vectorLayer.setVisible(false);
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lunaButonImg.style.webkitFilter = "brightness(50%)";
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},
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isVisible: function ()
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{
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return this.vectorLayer.getVisible();
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}
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};
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