center property
LatLng
center
Obtain coordinates of the bounds center
Implementation
LatLng get center {
/* https://stackoverflow.com/a/4656937
http://www.movable-type.co.uk/scripts/latlong.html
coord 1: southWest
coord 2: northEast
phi: lat
lambda: lng
*/
final phi1 = southWest!.latitudeInRad;
final lambda1 = southWest!.longitudeInRad;
final phi2 = northEast!.latitudeInRad;
final dLambda = degToRadian(northEast!.longitude -
southWest!.longitude); // delta lambda = lambda2-lambda1
final bx = math.cos(phi2) * math.cos(dLambda);
final by = math.cos(phi2) * math.sin(dLambda);
final phi3 = math.atan2(math.sin(phi1) + math.sin(phi2),
math.sqrt((math.cos(phi1) + bx) * (math.cos(phi1) + bx) + by * by));
final lambda3 = lambda1 + math.atan2(by, math.cos(phi1) + bx);
// phi3 and lambda3 are actually in radians and LatLng wants degrees
return LatLng(radianToDeg(phi3), radianToDeg(lambda3));
}