/// <summary>
/// Given a shapefile <see cref="Shape"/> object, return a <see cref="CzmlShape"/> that can be written to CZML.
/// </summary>
/// <param name="shape">Te shapefile <see cref="Shape"/>.</param>
/// <param name="document">The <see cref="CzmlDocument"/> to which the shape will be written when its Write() method is called.</param>
/// <param name="color">A color for the shape's visualization.</param>
/// <returns>A new <see cref="CzmlShape"/>.</returns>
static public CzmlShape Create(Shape shape, CzmlDocument document, Color color)
{
switch (shape.ShapeType)
{
case ShapeType.Point:
case ShapeType.PointM:
case ShapeType.PointZ:
return new Point((PointShape)shape, document, color);
case ShapeType.MultiPoint:
case ShapeType.MultiPointM:
case ShapeType.MultiPointZ:
return new MultiPoint((MultiPointShape)shape, document, color);
case ShapeType.Polyline:
case ShapeType.PolylineM:
case ShapeType.PolylineZ:
return new Polyline((PolylineShape)shape, document, color);
case ShapeType.Polygon:
case ShapeType.PolygonM:
case ShapeType.PolygonZ:
return new Polygon((PolygonShape)shape, document, color);
case ShapeType.MultiPatch:
return new MultiPatch((MultiPatchShape)shape, document, color);
}
throw new NotImplementedException();
}
/// <summary>
/// Creates a Shape object (or derived object) from a shape record
/// </summary>
/// <param name="shapeData">The shape record as a byte array</param>
/// <param name="metadata">Metadata associated with this shape (optional)</param>
/// <param name="dataRecord">IDataRecord associated with the metadata</param>
/// <returns>A Shape, or derived class</returns>
/// <exception cref="ArgumentNullException">Thrown if shapeData or metadata are null</exception>
/// <exception cref="ArgumentException">Thrown if shapeData is less than 12 bytes long</exception>
/// <exception cref="InvalidOperationException">Thrown if an error occurs parsing shapeData</exception>
public static Shape ParseShape(byte[] shapeData, StringDictionary metadata, IDataRecord dataRecord)
{
if (shapeData == null)
{
throw new ArgumentNullException("shapeData");
}
if (shapeData.Length < 12)
{
throw new ArgumentException("shapeData must be at least 12 bytes long");
}
// shape data contains a header (shape number and content length)
// the first field in each shape is the shape type
//Position Field Value Type Order
//Byte 0 Record Number Record Number Integer Big
//Byte 4 Content Length Content Length Integer Big
//Position Field Value Type Number Order
//Byte 0 Shape Type Shape Type Integer 1 Little
int recordNumber = EndianBitConverter.ToInt32(shapeData, 0, ProvidedOrder.Big);
int contentLengthInWords = EndianBitConverter.ToInt32(shapeData, 4, ProvidedOrder.Big);
ShapeType shapeType = (ShapeType)EndianBitConverter.ToInt32(shapeData, 8, ProvidedOrder.Little);
// test that we have the expected amount of data - need to take the 8 byte header into account
if (shapeData.Length != (contentLengthInWords * 2) + 8)
{
throw new InvalidOperationException("Shape data length does not match shape header length");
}
Shape shape = null;
switch (shapeType)
{
case ShapeType.Null:
shape = new Shape(shapeType, recordNumber, metadata, dataRecord);
break;
case ShapeType.Point:
shape = new ShapePoint(recordNumber, metadata, dataRecord, shapeData);
break;
case ShapeType.MultiPoint:
shape = new ShapeMultiPoint(recordNumber, metadata, dataRecord, shapeData);
break;
case ShapeType.PolyLine:
shape = new ShapePolyLine(recordNumber, metadata, dataRecord, shapeData);
break;
case ShapeType.PolyLineM:
shape = new ShapePolyLineM(recordNumber, metadata, dataRecord, shapeData);
break;
case ShapeType.Polygon:
shape = new ShapePolygon(recordNumber, metadata, dataRecord, shapeData);
break;
default:
throw new NotImplementedException(string.Format("Shapetype {0} is not implemented", shapeType));
}
return shape;
}
