kopia lustrzana https://github.com/projecthorus/chasemapper
108 wiersze
3.5 KiB
JavaScript
108 wiersze
3.5 KiB
JavaScript
// Utility Functions
|
|
// Mark Jessop 2018-06-30
|
|
|
|
// Color cycling for balloon traces and icons - Hopefully 4 colors should be enough for now!
|
|
var colour_values = ['blue','green','purple'];
|
|
var colour_idx = 0;
|
|
|
|
// Create a set of icons for the different colour values.
|
|
var balloonAscentIcons = {};
|
|
var balloonDescentIcons = {};
|
|
var balloonLandingIcons = {};
|
|
var balloonPayloadIcons = {};
|
|
|
|
// TODO: Make these /static URLS be filled in with templates (or does it not matter?)
|
|
for (_col in colour_values){
|
|
balloonAscentIcons[colour_values[_col]] = L.icon({
|
|
iconUrl: "/static/img/balloon-" + colour_values[_col] + '.png',
|
|
iconSize: [46, 85],
|
|
iconAnchor: [23, 76]
|
|
});
|
|
balloonDescentIcons[colour_values[_col]] = L.icon({
|
|
iconUrl: "/static/img/parachute-" + colour_values[_col] + '.png',
|
|
iconSize: [46, 84],
|
|
iconAnchor: [23, 76]
|
|
});
|
|
balloonLandingIcons[colour_values[_col]] = L.icon({
|
|
iconUrl: "/static/img/target-" + colour_values[_col] + '.png',
|
|
iconSize: [20, 20],
|
|
iconAnchor: [10, 10]
|
|
});
|
|
balloonPayloadIcons[colour_values[_col]] = L.icon({
|
|
iconUrl: "/static/img/payload-" + colour_values[_col] + '.png',
|
|
iconSize: [17, 18],
|
|
iconAnchor: [8, 14]
|
|
});
|
|
}
|
|
|
|
// Burst Icon
|
|
var burstIcon = L.icon({
|
|
iconUrl: "/static/img/balloon-pop.png",
|
|
iconSize: [20,20],
|
|
iconAnchor: [10,10]
|
|
});
|
|
|
|
var abortIcon = L.icon({
|
|
iconUrl: "/static/img/target-red.png",
|
|
iconSize: [20,20],
|
|
iconAnchor: [10,10]
|
|
});
|
|
|
|
var carIcon = L.icon({
|
|
iconUrl: "/static/img/car-blue.png",
|
|
iconSize: [55,25],
|
|
iconAnchor: [27,12] // Revisit this
|
|
});
|
|
|
|
|
|
// calculates look angles between two points
|
|
// format of a and b should be {lon: 0, lat: 0, alt: 0}
|
|
// returns {elevention: 0, azimut: 0, bearing: "", range: 0}
|
|
//
|
|
// based on earthmath.py
|
|
// Copyright 2012 (C) Daniel Richman; GNU GPL 3
|
|
|
|
var DEG_TO_RAD = Math.PI / 180.0;
|
|
var EARTH_RADIUS = 6371000.0;
|
|
|
|
function calculate_lookangles(a, b) {
|
|
// degrees to radii
|
|
a.lat = a.lat * DEG_TO_RAD;
|
|
a.lon = a.lon * DEG_TO_RAD;
|
|
b.lat = b.lat * DEG_TO_RAD;
|
|
b.lon = b.lon * DEG_TO_RAD;
|
|
|
|
var d_lon = b.lon - a.lon;
|
|
var sa = Math.cos(b.lat) * Math.sin(d_lon);
|
|
var sb = (Math.cos(a.lat) * Math.sin(b.lat)) - (Math.sin(a.lat) * Math.cos(b.lat) * Math.cos(d_lon));
|
|
var bearing = Math.atan2(sa, sb);
|
|
var aa = Math.sqrt(Math.pow(sa, 2) + Math.pow(sb, 2));
|
|
var ab = (Math.sin(a.lat) * Math.sin(b.lat)) + (Math.cos(a.lat) * Math.cos(b.lat) * Math.cos(d_lon));
|
|
var angle_at_centre = Math.atan2(aa, ab);
|
|
var great_circle_distance = angle_at_centre * EARTH_RADIUS;
|
|
|
|
ta = EARTH_RADIUS + a.alt;
|
|
tb = EARTH_RADIUS + b.alt;
|
|
ea = (Math.cos(angle_at_centre) * tb) - ta;
|
|
eb = Math.sin(angle_at_centre) * tb;
|
|
var elevation = Math.atan2(ea, eb) / DEG_TO_RAD;
|
|
|
|
// Use Math.coMath.sine rule to find unknown side.
|
|
var distance = Math.sqrt(Math.pow(ta, 2) + Math.pow(tb, 2) - 2 * tb * ta * Math.cos(angle_at_centre));
|
|
|
|
// Give a bearing in range 0 <= b < 2pi
|
|
bearing += (bearing < 0) ? 2 * Math.PI : 0;
|
|
bearing /= DEG_TO_RAD;
|
|
|
|
var value = Math.round(bearing % 90);
|
|
value = ((bearing > 90 && bearing < 180) || (bearing > 270 && bearing < 360)) ? 90 - value : value;
|
|
|
|
var str_bearing = "" + ((bearing < 90 || bearing > 270) ? 'N' : 'S')+ " " + value + '° ' + ((bearing < 180) ? 'E' : 'W');
|
|
|
|
return {
|
|
'elevation': elevation,
|
|
'azimuth': bearing,
|
|
'range': distance,
|
|
'bearing': str_bearing
|
|
};
|
|
} |