// The idl is organized into these sections:
//
// Enumerations and structures
// Geometry object interfaces
// Operator interfaces
// Import/Export interfaces
// geometry support objects and class objects

import "ocidl.idl", "SpatialReferenceIdl.idl";

/* Forward declare */

interface IGeometry;
interface IPoint;
interface IPointZ;
interface ICurve;
interface ILineString;
interface ILinearRing;
interface ISurface;
interface IPolygon;
interface IGeometryCollection;
interface IMultiSurface;
interface IMultiCurve;
interface IMultiPoint;

//
// Geometry interfaces
//
[ object, uuid(6A124031-FE38-11d0-BECE-00805F7C4268) ]
interface IGeometry : IUnknown
{
  [propget] HRESULT Dimension([out, retval] long * dimension);
  [propget] HRESULT SpatialReference([out, retval] ISpatialReference** spatialRef);
  [propputref] HRESULT SpatialReference([in] ISpatialReference* spatialRef);
  [propget] HRESULT IsEmpty([out, retval] VARIANT_BOOL * isEmpty);
  HRESULT SetEmpty();
  [propget] HRESULT IsSimple([out, retval] VARIANT_BOOL * isSimple);
  HRESULT Envelope([out, retval] IGeometry** envelope);
  HRESULT Clone([out, retval] IGeometry ** newShape);
  HRESULT Project([in] ISpatialReference * newSystem, [out, retval] IGeometry **result);
  HRESULT Extent2D([out] double* minX, [out] double* minY, [out] double* maxX, [out] double* maxY);
};

 
[ object, uuid(6A124032-FE38-11d0-BECE-00805F7C4268) ]
interface IWks : IUnknown
{
  HRESULT ExportToWKB([out, retval] VARIANT* wkb); 
  HRESULT ExportToWKT([out, retval] BSTR* wkt); 
  HRESULT ImportFromWKB([in] VARIANT wkb, [in] ISpatialReference* spatialRef);
  HRESULT ImportFromWKT([in] BSTR wkt, [in] ISpatialReference* spatialRef);
};

[ object, uuid(6A124033-FE38-11d0-BECE-00805F7C4268) ]
interface IGeometryFactory : IUnknown
{
  HRESULT CreateFromWKB([in] VARIANT wkb, [in] ISpatialReference* spatialRef, [out, retval] IGeometry** geometry);
  HRESULT CreateFromWKT([in] BSTR wkt, [in] ISpatialReference* spatialRef, [out, retval] IGeometry** geometry);
}

[ object, uuid(6A124035-FE38-11d0-BECE-00805F7C4268) ]
interface IPoint : IGeometry
{
 HRESULT Coords([out] double* x, [out] double * y);
 [propget] HRESULT X([out, retval] double * x);  // for OLE Automation Clients
 [propget] HRESULT Y([out, retval] double * y); // for Automation Clients
};

[ object, uuid(D4579E2D-1D2B-11d3-80BE-00C04F680FFF) ]
interface IPointZ : IPoint
{
 [propget] HRESULT Z([out, retval] double * z);
};

[ object, uuid(6A124036-FE38-11d0-BECE-00805F7C4268) ]
interface ICurve : IGeometry
{
  [propget] HRESULT Length([out, retval] double* value);
  HRESULT StartPoint([out, retval] IPoint** sp);            
  HRESULT EndPoint([out, retval] IPoint** ep);
  [propget] HRESULT IsClosed([out, retval] VARIANT_BOOL * isClosed);
  HRESULT Value([in] double t, [out, retval] IPoint** p);
};

[ object, uuid(6A124037-FE38-11d0-BECE-00805F7C4268) ]
interface ILineString : ICurve
{
  [propget] HRESULT NumPoints  ([out, retval] long * numPoints);
  HRESULT Point ([in] long index, [out, retval] IPoint ** point);
};

[ object, uuid(6A124038-FE38-11d0-BECE-00805F7C4268) ]  
interface ILinearRing : ILineString
{
};

[ object, uuid(6A124039-FE38-11d0-BECE-00805F7C4268) ]
interface ISurface : IGeometry
{
  [propget] HRESULT Area   ([out, retval] double* area);
  HRESULT Centroid ([out, retval] IPoint** result);
  HRESULT PointOnSurface  ([out, retval] IPoint** result);
};

[ object, uuid(6A12403A-FE38-11d0-BECE-00805F7C4268) ]
interface IGeometryCollection : IGeometry
{
  [propget] HRESULT NumGeometries ([out, retval] long*   numberOf);
  HRESULT   Geometry ([in] long index, [out, retval] IGeometry** geometry);
}


[ object, uuid(6A12403C-FE38-11d0-BECE-00805F7C4268) ]
interface IPolygon : ISurface
{
  HRESULT ExteriorRing([out, retval] ILinearRing ** exteriorRing);
  [propget] HRESULT NumInteriorRings([out, retval] long * count);
  HRESULT InteriorRing([in] long index, [out, retval] ILinearRing ** interiorRing);
}

[ object, uuid(6A12403D-FE38-11d0-BECE-00805F7C4268) ]
interface IMultiCurve : IGeometryCollection
{
  [propget] HRESULT Length   ([out, retval] double* length);
  [propget] HRESULT IsClosed([out, retval] VARIANT_BOOL * isClosed);
};

[ object, uuid(6A12403F-FE38-11d0-BECE-00805F7C4268) ]
interface IMultiSurface : IGeometryCollection
{
  [propget] HRESULT Area   ([out, retval] double* area);
  HRESULT Centroid ([out, retval] IPoint** result);
  HRESULT PointOnSurface  ([out, retval] IPoint** result);
};


// implementors may choose to implement one or both of the Spatial Relation interfaces.

[ object, uuid(6A124040-FE38-11d0-BECE-00805F7C4268) ]
interface ISpatialRelation : IUnknown
{
  HRESULT Equals  ([in] IGeometry* other, [out, retval] VARIANT_BOOL * equals);
  HRESULT Touches ([in] IGeometry* other, [out, retval] VARIANT_BOOL * touches);
  HRESULT Contains([in] IGeometry* other, [out, retval] VARIANT_BOOL * contains);
  HRESULT Within  ([in] IGeometry* other, [out, retval] VARIANT_BOOL * within);
  HRESULT Disjoint([in] IGeometry* other, [out, retval] VARIANT_BOOL * disjoint);
  HRESULT Crosses ([in] IGeometry* other, [out, retval] VARIANT_BOOL * crosses);
  HRESULT Overlaps([in] IGeometry* other, [out, retval] VARIANT_BOOL * overlaps);
  HRESULT Intersects([in] IGeometry* other, [out, retval] VARIANT_BOOL * overlaps);
}

[ object, uuid(6A124041-FE38-11d0-BECE-00805F7C4268) ]
interface ISpatialRelation2 : IUnknown
{
  HRESULT Relate ([in] IGeometry* other, 
                  [in] BSTR patternMatrix, [out, retval] VARIANT_BOOL* isRelated);
};

// The ISpatialOperator interface groups the commonly used and agreed upon operators 
// into a single interface. Operators that are less commonly used can be moved into a 
// separate ISpatialOperator2 interface.
// The goal has been to minimize the number of interfaces that clients deal with.

[ object, uuid(6A124042-FE38-11d0-BECE-00805F7C4268) ]
interface ISpatialOperator : IUnknown
{
  // Proximity Operators

  HRESULT Distance([in] IGeometry* other, [out, retval] double* distance);

  // Topological Operators

  HRESULT Boundary([out, retval] IGeometry ** boundary);

  // Analysis - Constructive Operators

  HRESULT Buffer([in] double distance, [out, retval] IGeometry** result);
  HRESULT ConvexHull([out, retval] IGeometry ** result);

  // Set Theoretic Operators

  HRESULT Intersection ([in] IGeometry* other, [out, retval] IGeometry ** result);
  HRESULT Union([in] IGeometry* other,  [out, retval] IGeometry ** result);
  HRESULT Difference([in] IGeometry* other, [out, retval] IGeometry ** result);
  HRESULT SymmetricDifference([in] IGeometry* other, [out, retval] IGeometry ** result);

};



#if defined(_GEOMETRY_)

// example of a specific geometry library implementation

[   uuid(6A124045-FE38-11d0-BECE-00805F7C4268),
    lcid(0x0000),
    version(1.0)
]

library Geometry
{

// COM Classes would be defined here. CoTypes are shown instead :

/*************************************************************************  
    coType Point
    {
        [mandatory] interface IGeometry;
        [mandatory] interface IPoint;
        [mandatory] interface IWks;

        [optional]  interface ISpatialRelation;
        [optional]  interface ISpatialRelation2;
        [optional]  interface ISpatialOperator;

    };

    coType LineString
    {
        [mandatory] interface IGeometry;
        [mandatory] interface ICurve;
        [mandatory] interface ILineString;
        [mandatory] interface IWks; 

        [optional]  interface ISpatialRelation;
        [optional]  interface ISpatialRelation2;
        [optional]  interface ISpatialOperator;

    };

    coType Polygon   
    {
        [mandatory] interface IGeometry;
        [mandatory] interface ISurface;
        [mandatory] interface IPolygon;   
        [mandatory] interface IWks;

        [optional]  interface ISpatialRelation;
        [optional]  interface ISpatialRelation2;
        [optional]  interface ISpatialOperator;
    };


    coType MultiPoint
    {
        [mandatory] interface IGeometry;
        [mandatory] interface IGeometryCollection;   
        [mandatory] interface IWks;

        [optional]  interface ISpatialRelation;
        [optional]  interface ISpatialRelation2;
        [optional]  interface ISpatialOperator;
    };


    coType MultiLineString
    {
        [mandatory] interface IGeometry;
        [mandatory] interface IGeometryCollection;
        [mandatory] interface IMultiCurve;
        [mandatory] interface IWks;

        [optional]  interface ISpatialRelation;
        [optional]  interface ISpatialRelation2;
        [optional]  interface ISpatialOperator;
    };



    coType MultiPolygon 
    {
        [mandatory] interface IGeometry;
        [mandatory] interface IGeometryCollection;
        [mandatory] interface IMultiSurface;
        [mandatory] interface IWks;

        [optional]  interface ISpatialRelation;
        [optional]  interface ISpatialRelation2;
        [optional]  interface ISpatialOperator;
    };
    
    coType GeometryCollection
    {
        [mandatory] interface IGeometry;
        [mandatory] interface IGeometryCollection;  
        [mandatory] interface IWks;

        [optional]  interface ISpatialRelation;
        [optional]  interface ISpatialRelation2;
        [optional]  interface ISpatialOperator;
    };

    coType GeometryFactory
    {
        [mandatory] interface IGeometryFactory;
    }

************************************************************/
}

#endif