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/**
* ============LICENSE_START========================================================================
* ONAP : ccsdk feature sdnr wt odlux
* =================================================================================================
* Copyright (C) 2020 highstreet technologies GmbH Intellectual Property. All rights reserved.
* =================================================================================================
* Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
* in compliance with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software distributed under the License
* is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
* or implied. See the License for the specific language governing permissions and limitations under
* the License.
* ============LICENSE_END==========================================================================
*/
const EARTHRADIUSM = 6378137;
type updatedCoordinates = { south: number, west: number, north: number, east: number };
export const increaseBoundingBox = (map: mapboxgl.Map) =>{
const bbox = map.getBounds();
const distance = map.getCenter().distanceTo(bbox.getNorthEast()); // radius of visible area (center -> corner) (in meters)
//calculate new boundingBox
const increasedBoundingBox = addDistance(bbox.getSouth(), bbox.getWest(), bbox.getNorth(), bbox.getEast(), (distance / 1000) / 2);
return increasedBoundingBox;
}
export const addDistance = (south: number, west: number, north: number, east: number, distanceKm: number): updatedCoordinates => {
const distanceInM = distanceKm * 1000;
const dLat = distanceInM / EARTHRADIUSM;
const dLon = distanceInM / (EARTHRADIUSM * Math.cos(Math.PI * (north + south) / 360));
const latOffset = dLat * 180 / Math.PI;
const lonOffset = dLon * 180 / Math.PI;
const newEast = checkLongitude(east + lonOffset);
const newWest = checkLongitude(west - lonOffset);
const newNorth = checkLatitude(north + latOffset);
const newSouth = checkLatitude(south - latOffset);
return { east: newEast, north: newNorth, south: newSouth, west: newWest };
}
//taken from https://www.movable-type.co.uk/scripts/latlong.html
export const calculateMidPoint = (lat1: number, lon1: number, lat2: number, lon2: number) =>{
const dLon = degrees_to_radians(lon2 - lon1);
//convert to radians
lat1 = degrees_to_radians(lat1);
lat2 = degrees_to_radians(lat2);
lon1 = degrees_to_radians(lon1);
const Bx = Math.cos(lat2) * Math.cos(dLon);
const By = Math.cos(lat2) * Math.sin(dLon);
const lat3 = Math.atan2(Math.sin(lat1) + Math.sin(lat2), Math.sqrt((Math.cos(lat1) + Bx) * (Math.cos(lat1) + Bx) + By * By));
const lon3 = lon1 + Math.atan2(By, Math.cos(lat1) + Bx);
return [radians_to_degrees(lon3), radians_to_degrees(lat3)];
}
export const LatLonToDMS = (value:number, isLon:boolean=false) =>{
const absoluteValue = Math.abs(value);
const d = Math.floor(absoluteValue);
const m = Math.floor((absoluteValue -d)* 60);
const s = (absoluteValue - d - m / 60 ) * 3600;
const dms=`${d}° ${m}' ${s.toFixed(2)}"`
const sign = Math.sign(value);
if(isLon){
return (sign === -1 || sign === -0 ) ? dms + " W" : dms + " E";
}else{
return (sign === -1 || sign === -0 ) ? dms + " S" : dms + " N";
}
}
// Because features come from tiled vector data, feature geometries may be split
// or duplicated across tile boundaries and, as a result, features may appear
// multiple times in query results.
//taken from https://docs.mapbox.com/mapbox-gl-js/example/filter-features-within-map-view/
export const getUniqueFeatures = (array: mapboxgl.MapboxGeoJSONFeature[], comparatorProperty:string) =>{
var existingFeatureKeys: any = {};
var uniqueFeatures = array.filter(function(el) {
if (existingFeatureKeys[el.properties![comparatorProperty]]) {
return false;
} else {
existingFeatureKeys[el.properties![comparatorProperty]] = true;
return true;
}
});
return uniqueFeatures;
}
const radians_to_degrees = (radians:number) =>{
var pi = Math.PI;
return radians * (180/pi);
}
const degrees_to_radians = (degrees: number) =>
{
return degrees * (Math.PI/180);
}
const checkLatitude = (lat: number) => {
if (lat > 90)
return 90;
else if (lat < -90)
return -90;
else
return lat;
}
const checkLongitude = (lon: number) => {
if (lon > 180)
return 180;
else if (lon < -180)
return -180;
else
return lon;
}
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