esriMultiPatchRingType Constants

MultiPatch Ring Types.

Constant	Value	Description
esriMultiPatchInvalidRing	1	Invalid Ring.
esriMultiPatchUndefinedRing	2	Ring type has not been defined.
esriMultiPatchFirstRing	4	The beginning FirstRing in a FirstRing/Ring sequence.
esriMultiPatchRing	8	A following Ring in a FirstRing/Ring sequence or a beginning Ring in a solo Ring group.
esriMultiPatchOuterRing	16	The beginning OuterRing in an OuterRing/InnerRing sequence.
esriMultiPatchInnerRing	32	A following InnerRing in an OuterRing/InnerRing sequence.
esriMultiPatchBeginningRingMask	28	A mask of valid beginning rings (OuterRings, FirstRings, and solo Rings).
esriMultiPatchFollowingRingMask	40	A mask of valid following rings (InnerRings and Rings).
esriMultiPatchProblemCaseRingMask	3	A mask of problematic rings (UndefinedRings and InvalidRings).

private static object _missing = Type.Missing;

public static IGeometry GetMultiPatchGeometry()

{

    const int XRange = 16;

    const int YRange = 16;

    const int InteriorRingCount = 25;

    const double HoleRange = 0.5;

    //RingGroup: Square Lying In XY Plane With Single Exterior Ring

    //             And Multiple Interior Rings

    IGeometryCollection multiPatchGeometryCollection = new MultiPatchClass();

    IMultiPatch multiPatch = multiPatchGeometryCollection as IMultiPatch;

    //Exterior Ring

    IPointCollection exteriorRingPointCollection = new RingClass();

    exteriorRingPointCollection.AddPoint(ConstructPoint3D(0.5 * (XRange + 2), -0.5 * (YRange + 2), 0), ref _missing, ref _missing);

    exteriorRingPointCollection.AddPoint(ConstructPoint3D(-0.5 * (XRange + 2), -0.5 * (YRange + 2), 0), ref _missing, ref _missing);

    exteriorRingPointCollection.AddPoint(ConstructPoint3D(-0.5 * (XRange + 2), 0.5 * (YRange + 2), 0), ref _missing, ref _missing);

    exteriorRingPointCollection.AddPoint(ConstructPoint3D(0.5 * (XRange + 2), 0.5 * (YRange + 2), 0), ref _missing, ref _missing);

    IRing exteriorRing = exteriorRingPointCollection as IRing;

    exteriorRing.Close();

    multiPatchGeometryCollection.AddGeometry(exteriorRing as IGeometry, ref _missing, ref _missing);

    multiPatch.PutRingType(exteriorRing, esriMultiPatchRingType.esriMultiPatchOuterRing);

    //Interior Rings

    Random random = new Random();

    for (int i = 0; i < InteriorRingCount; i++)

    {

        double interiorRingOriginX = XRange * (random.NextDouble() - 0.5);

        double interiorRingOriginY = YRange * (random.NextDouble() - 0.5);

        IPointCollection interiorRingPointCollection = new RingClass();

        interiorRingPointCollection.AddPoint(ConstructPoint3D(interiorRingOriginX - 0.5 * HoleRange, interiorRingOriginY - 0.5 * HoleRange, 0), ref _missing, ref _missing);

        interiorRingPointCollection.AddPoint(ConstructPoint3D(interiorRingOriginX + 0.5 * HoleRange, interiorRingOriginY - 0.5 * HoleRange, 0), ref _missing, ref _missing);

        interiorRingPointCollection.AddPoint(ConstructPoint3D(interiorRingOriginX + 0.5 * HoleRange, interiorRingOriginY + 0.5 * HoleRange, 0), ref _missing, ref _missing);

        interiorRingPointCollection.AddPoint(ConstructPoint3D(interiorRingOriginX - 0.5 * HoleRange, interiorRingOriginY + 0.5 * HoleRange, 0), ref _missing, ref _missing);

        IRing interiorRing = interiorRingPointCollection as IRing;

        interiorRing.Close();

        multiPatchGeometryCollection.AddGeometry(interiorRing as IGeometry, ref _missing, ref _missing);

        multiPatch.PutRingType(interiorRing, esriMultiPatchRingType.esriMultiPatchInnerRing);

    }

    return multiPatchGeometryCollection as IGeometry;

}

public static IPoint ConstructPoint3D(double x, double y, double z)

{

    IPoint point = ConstructPoint2D(x, y);

    point.Z = z;

    return point;

}

public static IPoint ConstructPoint2D(double x, double y)

{

    IPoint point = new PointClass();

    point.PutCoords(x, y);

    return point;

}