MgMultiPolygon Class Reference
[MgMultiPolygon]
Inherits MgAggregateGeometry.
Detailed Description
An MgMultiPolygon is a two-dimensional aggregate geometry whose elements are MgPolygon geometries.
- Remarks:
- The polygons are not connected or ordered. An instance of this class is constructed by calling a non-static MgGeometryFactory::CreateMultiPolygon() method and, once constructed, is immutable.
Example (PHP)
The following code shows the construction of an MgMultiPolygon geometry. Review the MgPolygon example code.
The following code shows the construction of an MgMultiPolygon geometry. Review the MgPolygon example code.
// A helper class additional to those created in the // MgPolygon example code is needed. $polygonCollection = new MgPolygonCollection(); // After each MgPolygon geometry is constructed, // it is added to an MgPolygonCollection. $index = $polygonCollection->Add($polygon); echo "A polygon is added to a polygon collection at index: $index\n"; // construct the MgMultiPolygon geometry $multiPolygon = $geometryFactory-> CreateMultiPolygon($polygonCollection); // print out the Agf Text string for the geometry $multiPolygonAgfText = $wktReaderWriter->Write($multiPolygon); echo "AGF Text representation of MultiPolygon: $multiPolygonAgfText\n";
Example (C#)
The CreateAMultiPolygonXY method calls the CreateAPolygonXY method. The code for the CreateAPolygonXY method is in the MgPolygon example code.
The CreateAMultiPolygonXY method calls the CreateAPolygonXY method. The code for the CreateAPolygonXY method is in the MgPolygon example code.
using OSGeo.MapGuide; private MgWktReaderWriter wktReaderWriter; private MgGeometryFactory geometryFactory; private MgMultiPolygon mpnPn0010110100Pn0010110100; // this array contains the data for 2 polygons whose values are identical private double[][][,] mpnPn0010110100Pn0010110100Data; // the following array is used for the exterior ring of a polygon // the points are in counterclockwise order private double[,] da0010110100 = { { 0, 0 }, { 1, 0 }, { 1, 1 }, { 0, 1 }, { 0, 0 } }; private String geometryAgfText; public MgMultiPolygon CreateAMultiPolygonXY(double[][][,] polygonData) { MgPolygonCollection polygons = new MgPolygonCollection(); ; for (int i = 0; i < polygonData.GetLength(0); i++) { polygons.Add(CreateAPolygonXY(polygonData[i])); } return geometryFactory.CreateMultiPolygon(polygons); } geometryFactory = new MgGeometryFactory(); pnEr0010110100Data = new double[1][,]; pnEr0010110100Data[0] = da0010110100; mpnPn0010110100Pn0010110100Data = new double[2][][,]; mpnPn0010110100Pn0010110100Data[0] = pnEr0010110100Data; mpnPn0010110100Pn0010110100Data[1] = pnEr0010110100Data; mpnPn0010110100Pn0010110100 = CreateAMultiPolygonXY(mpnPn0010110100Pn0010110100Data); // print out the Agf Text string for the geometry wktReaderWriter = new MgWktReaderWriter(); geometryAgfText = wktReaderWriter.Write(mpnPn0010110100Pn0010110100); // geometryAgfText now contains: // "MULTIPOLYGON XY ((( 0 0, 1 0, 1 1, 0 1, 0 0 )), (( 0 0, 1 0, 1 1, 0 1, 0 0 )))"
Public Member Functions | |
| virtual MgGeometricEntity * | Copy () |
| virtual MgCoordinateIterator * | GetCoordinates () |
| Returns an iterator over the coordinates included in this geometric entity. | |
| virtual INT32 | GetCount () |
| virtual INT32 | GetDimension () |
| virtual INT32 | GetGeometryType () |
| virtual MgPolygon * | GetPolygon (INT32 index) |
| virtual bool | IsClosed () |
| virtual bool | IsEmpty () |
| virtual MgGeometricEntity * | Transform (MgTransform *transform) |
| Returns a transformed copy of this geometric entity. | |