/// <summary>
/// Computes the result.
/// </summary>
protected override void ComputeResult()
{
if (Source.ReferenceSystem != null && _targetReferenceSystem != null && !Source.ReferenceSystem.Equals(_targetReferenceSystem))
{
// strategy pattern
_transformation = TransformationStrategyFactory.CreateStrategy(Source.ReferenceSystem as ReferenceSystem, _targetReferenceSystem as ReferenceSystem);
}
if (_factory == null)
{
_factory = (IGeometryFactory)FactoryRegistry.GetFactory(FactoryRegistry.GetContract(Source.Factory), _targetReferenceSystem);
}
_intermediateResult = Compute(Source);
}
/// <summary>
/// Initializes a new instance of the <see cref="CompoundTransformationStrategy" /> 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>
public CompoundTransformationStrategy(ITransformationStrategy <Coordinate, GeoCoordinate> conversionToGeographic, ITransformationStrategy <GeoCoordinate, GeoCoordinate> geographicTransformation, ITransformationStrategy <GeoCoordinate, Coordinate> conversionFromGeographic)
{
_conversionFromGeographic = conversionFromGeographic;
_geographicTransformation = geographicTransformation;
_conversionToGeographic = conversionToGeographic;
}
/// <summary>
/// Creates a transformation strategy 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 is not supported between the specified coordinate reference systems.</exception>
public static ITransformationStrategy CreateStrategy(ReferenceSystem source, ReferenceSystem target)
{
ITransformationStrategy <Coordinate, GeoCoordinate> conversionToGeographic = null;
ITransformationStrategy <GeoCoordinate, GeoCoordinate> transformation = null;
ITransformationStrategy <GeoCoordinate, Coordinate> conversionFromGeographic = null;
switch (source.Type)
{
case ReferenceSystemType.Projected:
conversionToGeographic = new ReverseProjectionStrategy(source as ProjectedCoordinateReferenceSystem);
break;
case ReferenceSystemType.Geographic2D:
case ReferenceSystemType.Geographic3D:
conversionToGeographic = CreateReverseConversion(source as CoordinateReferenceSystem);
break;
}
switch (target.Type)
{
case ReferenceSystemType.Projected:
conversionFromGeographic = new ForwardProjectionStrategy(target as ProjectedCoordinateReferenceSystem);
break;
case ReferenceSystemType.Geographic2D:
case ReferenceSystemType.Geographic3D:
conversionFromGeographic = CreateForwardConversion(target as CoordinateReferenceSystem);
break;
}
// if no transformation is needed
if (conversionFromGeographic.TargetReferenceSystem.Equals(conversionToGeographic.SourceReferenceSystem))
{
return(new ConversionStrategy(conversionToGeographic, conversionFromGeographic));
}
// load matching forward transformation
IList <GeographicTransformation> transformations = GeographicTransformations.FromReferenceSystems(conversionToGeographic.TargetReferenceSystem as GeographicCoordinateReferenceSystem,
conversionFromGeographic.SourceReferenceSystem as GeographicCoordinateReferenceSystem);
if (transformations.Count > 0)
{
transformation = new ForwardGeographicStrategy(conversionToGeographic.TargetReferenceSystem as GeographicCoordinateReferenceSystem,
conversionFromGeographic.SourceReferenceSystem as GeographicCoordinateReferenceSystem,
transformations[0]);
return(new CompoundTransformationStrategy(conversionToGeographic, transformation, conversionFromGeographic));
}
// if none found, load matching reverse transformation
transformations = GeographicTransformations.FromReferenceSystems(conversionFromGeographic.SourceReferenceSystem as GeographicCoordinateReferenceSystem,
conversionToGeographic.TargetReferenceSystem as GeographicCoordinateReferenceSystem);
if (transformations.Count > 0)
{
transformation = new ReverseGeographicStrategy(conversionToGeographic.TargetReferenceSystem as GeographicCoordinateReferenceSystem,
conversionFromGeographic.SourceReferenceSystem as GeographicCoordinateReferenceSystem,
transformations[0]);
return(new CompoundTransformationStrategy(conversionToGeographic, transformation, conversionFromGeographic));
}
throw new NotSupportedException("Conversion is not supported between the specified coordinate reference systems.");
}
