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[distance-to-portal] also show bearing

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fkloft
2015-02-21 14:02:01 +01:00
parent 227d1b18ac
commit 9c534c8898
3 changed files with 86 additions and 10 deletions
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43
external/LatLng_Bearings.js vendored Normal file
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/*
* extend Leaflet's LatLng class
* giving it the ability to calculate the bearing to another LatLng
* Usage example:
* here = map.getCenter(); / some latlng
* there = L.latlng([37.7833,-122.4167]);
* var whichway = here.bearingWordTo(there);
* var howfar = (here.distanceTo(there) / 1609.34).toFixed(2);
* alert("San Francisco is " + howfar + " miles, to the " + whichway );
*
* Greg Allensworth <greg.allensworth@gmail.com>
* No license, use as you will, kudos welcome but not required, etc.
*/
L.LatLng.prototype.bearingTo = function(other) {
var d2r = L.LatLng.DEG_TO_RAD;
var r2d = L.LatLng.RAD_TO_DEG;
var lat1 = this.lat * d2r;
var lat2 = other.lat * d2r;
var dLon = (other.lng-this.lng) * d2r;
var y = Math.sin(dLon) * Math.cos(lat2);
var x = Math.cos(lat1)*Math.sin(lat2) - Math.sin(lat1)*Math.cos(lat2)*Math.cos(dLon);
var brng = Math.atan2(y, x);
brng = parseInt( brng * r2d );
brng = (brng + 360) % 360;
return brng;
};
L.LatLng.prototype.bearingWordTo = function(other) {
var bearing = this.bearingTo(other);
var bearingword = '';
if (bearing >= 22 && bearing <= 67) bearingword = 'NE';
else if (bearing >= 67 && bearing <= 112) bearingword = 'E';
else if (bearing >= 112 && bearing <= 157) bearingword = 'SE';
else if (bearing >= 157 && bearing <= 202) bearingword = 'S';
else if (bearing >= 202 && bearing <= 247) bearingword = 'SW';
else if (bearing >= 247 && bearing <= 292) bearingword = 'W';
else if (bearing >= 292 && bearing <= 337) bearingword = 'NW';
else if (bearing >= 337 || bearing <= 22) bearingword = 'N';
return bearingword;
};