/// <summary>
/// Convert region geography from one coordinate system to
/// another coordinate system.
/// </summary>
/// <param name="regionGeography">Region geography that should be converted.</param>
/// <param name="fromCoordinateSystem">From coordinate system.</param>
/// <param name="toCoordinateSystem">To coordinate system.</param>
/// <returns>Region geography with coordinates according to toCoordinateSystem</returns>
public virtual WebRegionGeography GetConvertedRegionGeography(WebRegionGeography regionGeography,
WebCoordinateSystem fromCoordinateSystem,
WebCoordinateSystem toCoordinateSystem)
{
WebRegionGeography toRegionGeography;
toRegionGeography = regionGeography;
toRegionGeography.MultiPolygon = GetConvertedMultiPolygon(regionGeography.MultiPolygon,
fromCoordinateSystem,
toCoordinateSystem);
toRegionGeography.BoundingBox = toRegionGeography.MultiPolygon.GetBoundingBox();
return(toRegionGeography);
}
/// <summary>
/// Test if point is located inside region.
/// Currently only two dimensions are handled.
/// </summary>
/// <param name="regionGeography">This region geography.</param>
/// <param name="context">Web service request context.</param>
/// <param name="coordinateSystem">Coordinate system used in region.</param>
/// <param name='point'>Point.</param>
/// <returns>True if point is located inside region.</returns>
public static Boolean IsPointInsideGeography(this WebRegionGeography regionGeography,
WebServiceContext context,
WebCoordinateSystem coordinateSystem,
WebPoint point)
{
SqlGeography geographyMultiPolygon, geographyPoint;
if (regionGeography.BoundingBox.IsPointInside(point))
{
geographyPoint = point.GetGeography();
geographyMultiPolygon = regionGeography.GetMultiPolygonGeography(context, coordinateSystem);
return(geographyMultiPolygon.STIntersects(geographyPoint).Value);
}
else
{
// Species observation can not be inside region
// since it is not inside the regions bounding box.
return(false);
}
}
/// <summary>
/// Get a SqlGeometry instance with same information as
/// property MultiPolygon in provided WebRegionGeography.
/// </summary>
/// <param name="regionGeography">This region geography.</param>
/// <param name="context">Web service request context.</param>
/// <param name="coordinateSystem">Coordinate system used in region.</param>
/// <returns>
/// A SqlGeometry instance with same information as
/// property MultiPolygon in provided WebRegionGeography.
/// </returns>
private static SqlGeometry GetMultiPolygonGeometry(this WebRegionGeography regionGeography,
WebServiceContext context,
WebCoordinateSystem coordinateSystem)
{
SqlGeometry geometryMultiPolygon;
String cacheKey;
// Get cached information.
cacheKey = "RegionSqlGeometry:" +
regionGeography.Id +
":CoordinateSystem:" +
coordinateSystem.GetWkt();
geometryMultiPolygon = (SqlGeometry)context.GetCachedObject(cacheKey);
if (geometryMultiPolygon.IsNull())
{
geometryMultiPolygon = regionGeography.MultiPolygon.GetGeometry();
// Add information to cache.
context.AddCachedObject(cacheKey, geometryMultiPolygon, new TimeSpan(1, 0, 0), CacheItemPriority.BelowNormal);
}
return(geometryMultiPolygon);
}