/// <summary>
/// Gets the elevation at the given <paramref name="position"/>, in meters.
/// </summary>
/// <param name="planet">The mapped planet.</param>
/// <param name="elevationMap">An elevation map.</param>
/// <param name="position">The position at which to determine elevation.</param>
/// <param name="options">The map projection used.</param>
/// <returns>
/// The elevation at the given <paramref name="position"/>, in meters.
/// </returns>
public static double GetElevationAt(
this Planetoid planet,
Image <L16> elevationMap,
Vector3 position,
MapProjectionOptions?options = null) => planet.GetElevationAt(
elevationMap,
planet.VectorToLatitude(position),
planet.VectorToLongitude(position),
options);
/// <summary>
/// Gets the elevation at the given <paramref name="position"/>, in meters.
/// </summary>
/// <param name="region">The mapped region.</param>
/// <param name="planet">The mapped planet.</param>
/// <param name="elevationMap">An elevation map.</param>
/// <param name="position">The position at which to determine elevation.</param>
/// <param name="equalArea">
/// If <see langword="true"/> the projection is a cylindrical equal-area projection.
/// Otherwise, an equirectangular projection will be used.
/// </param>
/// <returns>
/// The elevation at the given <paramref name="position"/>, in meters. Or <see
/// cref="double.NaN"/> if the given <paramref name="position"/> is not contained within
/// this region.
/// </returns>
public static double GetElevationAt(
this SurfaceRegion region,
Planetoid planet,
Image <L16> elevationMap,
Vector3 position,
bool equalArea = false)
{
var pos = region.PlanetaryPosition + position;
return(region.GetElevationAt(
planet,
elevationMap,
planet.VectorToLatitude(pos),
planet.VectorToLongitude(pos),
equalArea));
}
double eastLongitude) GetBounds(Planetoid planet)
{
var lat = planet.VectorToLatitude(PlanetaryPosition);
var lon = planet.VectorToLongitude(PlanetaryPosition);
var range = (double)((Frustum <HugeNumber>)Shape).FieldOfViewAngle;
if (range is >= Math.PI or <= 0)
{
return(
-DoubleConstants.HalfPi,
-Math.PI,
DoubleConstants.HalfPi,
Math.PI);
}
var halfLatRange = range / 2;
var equalAreaAspectRatio = Math.PI * Math.Cos(lat).Square();
var halfLonRange = Math.Min(
DoubleConstants.HalfPi,
Math.Max(range, range * equalAreaAspectRatio / 2));
var minLat = LatitudeBounded(lat - halfLatRange);
var maxLat = LatitudeBounded(lat + halfLatRange);
var minLon = LongitudeBounded(lon - halfLonRange);
var maxLon = LongitudeBounded(lon + halfLonRange);
if (minLat > maxLat)
{
var tmp = minLat;
minLat = maxLat;
maxLat = tmp;
}
if (minLon > maxLon)
{
var tmp = minLon;
minLon = maxLon;
maxLon = tmp;
}
return(
minLat,
minLon,
maxLat,
maxLon);
}