/// <summary>
/// Creates a strategy for converting coordinates between reference systems.
/// </summary>
/// <param name="source">The source.</param>
/// <param name="target">The target.</param>
/// <returns>The produced transformation strategy.</returns>
/// <exception cref="System.NotSupportedException">Conversion does not exist between the specified reference systems.</exception>
public ICoordinateOperationStrategy CreateStrategy(ReferenceSystem source, ReferenceSystem target)
{
ICoordinateOperationStrategy <Coordinate, GeoCoordinate> conversionToGeographic = null;
ICoordinateOperationStrategy <GeoCoordinate, GeoCoordinate> transformation = null;
ICoordinateOperationStrategy <GeoCoordinate, Coordinate> conversionFromGeographic = null;
switch (source.Type)
{
case ReferenceSystemType.Projected:
conversionToGeographic = new ReverseCoordinateProjectionStrategy(source as ProjectedCoordinateReferenceSystem);
break;
case ReferenceSystemType.Geographic2D:
case ReferenceSystemType.Geographic3D:
conversionToGeographic = this.CreateReverseConversion(source as CoordinateReferenceSystem);
break;
}
switch (target.Type)
{
case ReferenceSystemType.Projected:
conversionFromGeographic = new ForwardCoordinateProjectionStrategy(target as ProjectedCoordinateReferenceSystem);
break;
case ReferenceSystemType.Geographic2D:
case ReferenceSystemType.Geographic3D:
conversionFromGeographic = this.CreateForwardConversion(target as CoordinateReferenceSystem);
break;
}
// if no transformation is needed
if (conversionFromGeographic.TargetReferenceSystem.Equals(conversionToGeographic.SourceReferenceSystem))
{
return(new CoordinateConversionStrategy(conversionToGeographic, conversionFromGeographic));
}
GeographicCoordinateReferenceSystem conversionTargetReferenceSystem = conversionToGeographic.TargetReferenceSystem as GeographicCoordinateReferenceSystem;
GeographicCoordinateReferenceSystem conversionSourceReferenceSystem = conversionFromGeographic.SourceReferenceSystem as GeographicCoordinateReferenceSystem;
// load matching forward transformation
IEnumerable <CoordinateTransformation <GeoCoordinate> > transformations = this.provider.GeoCoordinateTransformations.WithProperties(conversionTargetReferenceSystem, conversionSourceReferenceSystem);
if (transformations.Any())
{
transformation = new ForwardGeographicCoordinateTransformationStrategy(conversionTargetReferenceSystem, conversionSourceReferenceSystem, transformations.First());
return(new CompoundCoordinateConversionStrategy(conversionToGeographic, transformation, conversionFromGeographic));
}
// if none found, load matching reverse transformation
transformations = this.provider.GeoCoordinateTransformations.WithProperties(conversionSourceReferenceSystem, conversionTargetReferenceSystem);
if (transformations.Any())
{
transformation = new ReverseGeographicCoordinateTransformationStrategy(conversionTargetReferenceSystem, conversionSourceReferenceSystem, transformations.First());
return(new CompoundCoordinateConversionStrategy(conversionToGeographic, transformation, conversionFromGeographic));
}
throw new NotSupportedException(ReferenceMessages.ConversionDoesNotExistBetweenReferenceSystems);
}
/// <summary>
/// Initializes a new instance of the <see cref="CoordinateConversionStrategy" /> class.
/// </summary>
/// <param name="conversionToGeographic">The conversion to geographic coordinate.</param>
/// <param name="conversionFromGeographic">The conversion from geographic coordinate.</param>
/// <exception cref="System.ArgumentNullException">The conversion is null.</exception>
public CoordinateConversionStrategy(ICoordinateOperationStrategy <Coordinate, GeoCoordinate> conversionToGeographic, ICoordinateOperationStrategy <GeoCoordinate, Coordinate> conversionFromGeographic)
{
if (conversionToGeographic == null)
{
throw new ArgumentNullException(nameof(conversionToGeographic));
}
this.conversionFromGeographic = conversionFromGeographic;
this.conversionToGeographic = conversionToGeographic ?? throw new ArgumentNullException(nameof(conversionFromGeographic));
}
/// <summary>
/// Initializes a new instance of the <see cref="CompoundCoordinateConversionStrategy" /> class.
/// </summary>
/// <param name="conversionToGeographic">The conversion to geographic coordinate.</param>
/// <param name="geographicTransformation">The geographic transformation.</param>
/// <param name="conversionFromGeographic">The conversion from geographic coordinate.</param>
/// <exception cref="System.ArgumentNullException">
/// The conversion is null.
/// or
/// The transformation is null.
/// </exception>
public CompoundCoordinateConversionStrategy(ICoordinateOperationStrategy <Coordinate, GeoCoordinate> conversionToGeographic, ICoordinateOperationStrategy <GeoCoordinate, GeoCoordinate> geographicTransformation, ICoordinateOperationStrategy <GeoCoordinate, Coordinate> conversionFromGeographic)
{
if (conversionToGeographic == null)
{
throw new ArgumentNullException(nameof(conversionToGeographic));
}
if (conversionToGeographic == null)
{
throw new ArgumentNullException(nameof(geographicTransformation));
}
this.conversionFromGeographic = conversionFromGeographic;
this.geographicTransformation = geographicTransformation;
this.conversionToGeographic = conversionToGeographic ?? throw new ArgumentNullException(nameof(conversionFromGeographic));
}