ogr2gmlgeometry.cpp

在linux环境下

        MakeGMLCoordinate( szCoordinate, 
                           poPoint->getX(), poPoint->getY(), poPoint->getZ(), 
                           TRUE );
                           
        _GrowBuffer( *pnLength + strlen(szCoordinate) + 70, 
                     ppszText, pnMaxLength );

        sprintf( *ppszText + *pnLength, 
                "<gml:Point><gml:coordinates>%s</gml:coordinates></gml:Point>",
                 szCoordinate );

        *pnLength += strlen( *ppszText + *pnLength );
    }

/* -------------------------------------------------------------------- */
/*      LineString and LinearRing                                       */
/* -------------------------------------------------------------------- */
    else if( poGeometry->getGeometryType() == wkbLineString 
             || poGeometry->getGeometryType() == wkbLineString25D )
    {
        int bRing = EQUAL(poGeometry->getGeometryName(),"LINEARRING");

        if( bRing )
            AppendString( ppszText, pnLength, pnMaxLength,
                          "<gml:LinearRing>" );
        else
            AppendString( ppszText, pnLength, pnMaxLength,
                          "<gml:LineString>" );

        AppendCoordinateList( (OGRLineString *) poGeometry, 
                              ppszText, pnLength, pnMaxLength );
        
        if( bRing )
            AppendString( ppszText, pnLength, pnMaxLength,
                          "</gml:LinearRing>" );
        else
            AppendString( ppszText, pnLength, pnMaxLength,
                          "</gml:LineString>" );
    }

/* -------------------------------------------------------------------- */
/*      Polygon                                                         */
/* -------------------------------------------------------------------- */
    else if( poGeometry->getGeometryType() == wkbPolygon 
             || poGeometry->getGeometryType() == wkbPolygon25D )
    {
        OGRPolygon      *poPolygon = (OGRPolygon *) poGeometry;

        AppendString( ppszText, pnLength, pnMaxLength,
                      "<gml:Polygon>" );

        if( poPolygon->getExteriorRing() != NULL )
        {
            AppendString( ppszText, pnLength, pnMaxLength,
                          "<gml:outerBoundaryIs>" );

            if( !OGR2GMLGeometryAppend( poPolygon->getExteriorRing(), 
                                        ppszText, pnLength, pnMaxLength ) )
                return FALSE;
            
            AppendString( ppszText, pnLength, pnMaxLength,
                          "</gml:outerBoundaryIs>" );
        }

        for( int iRing = 0; iRing < poPolygon->getNumInteriorRings(); iRing++ )
        {
            OGRLinearRing *poRing = poPolygon->getInteriorRing(iRing);

            AppendString( ppszText, pnLength, pnMaxLength,
                          "<gml:innerBoundaryIs>" );
            
            if( !OGR2GMLGeometryAppend( poRing, ppszText, pnLength, 
                                        pnMaxLength ) )
                return FALSE;
            
            AppendString( ppszText, pnLength, pnMaxLength,
                          "</gml:innerBoundaryIs>" );
        }

        AppendString( ppszText, pnLength, pnMaxLength,
                      "</gml:Polygon>" );
    }

/* -------------------------------------------------------------------- */
/*      MultiPolygon                                                    */
/* -------------------------------------------------------------------- */
    else if( poGeometry->getGeometryType() == wkbMultiPolygon 
             || poGeometry->getGeometryType() == wkbMultiPolygon25D )
    {
        OGRMultiPolygon *poMPoly = (OGRMultiPolygon *) poGeometry;
        int             iMember;

        AppendString( ppszText, pnLength, pnMaxLength,
                      "<gml:MultiPolygon>" );

        for( iMember = 0; iMember < poMPoly->getNumGeometries(); iMember++)
        {
            OGRGeometry *poMember = poMPoly->getGeometryRef( iMember );

            AppendString( ppszText, pnLength, pnMaxLength,
                          "<gml:polygonMember>" );
            
            if( !OGR2GMLGeometryAppend( poMember, 
                                        ppszText, pnLength, pnMaxLength ) )
                return FALSE;
            
            AppendString( ppszText, pnLength, pnMaxLength,
                          "</gml:polygonMember>" );
        }

        AppendString( ppszText, pnLength, pnMaxLength,
                      "</gml:MultiPolygon>" );
    }
    else
        return FALSE;

    return TRUE;
}

/************************************************************************/
/*                   OGR_G_ExportEnvelopeToGMLTree()                    */
/*                                                                      */
/*      Export the envelope of a geometry as a gml:Box.                 */
/************************************************************************/

CPLXMLNode *OGR_G_ExportEnvelopeToGMLTree( OGRGeometryH hGeometry )

{
    CPLXMLNode *psBox, *psCoord;
    OGREnvelope sEnvelope;
    char        szCoordinate[256];
    char       *pszY;

    memset( &sEnvelope, 0, sizeof(sEnvelope) );
    ((OGRGeometry *) hGeometry)->getEnvelope( &sEnvelope );

    if( sEnvelope.MinX == 0 && sEnvelope.MaxX == 0 
        && sEnvelope.MaxX == 0 && sEnvelope.MaxY == 0 )
    {
        /* there is apparently a special way of representing a null box
           geometry ... we should use it here eventually. */

        return NULL;
    }

    psBox = CPLCreateXMLNode( NULL, CXT_Element, "gml:Box" );

/* -------------------------------------------------------------------- */
/*      Add minxy coordinate.                                           */
/* -------------------------------------------------------------------- */
    psCoord = CPLCreateXMLNode( psBox, CXT_Element, "gml:coord" );
    
    MakeGMLCoordinate( szCoordinate, sEnvelope.MinX, sEnvelope.MinY, 0.0, 
                       FALSE );
    pszY = strstr(szCoordinate,",") + 1;
    pszY[-1] = '\0';

    CPLCreateXMLElementAndValue( psCoord, "gml:X", szCoordinate );
    CPLCreateXMLElementAndValue( psCoord, "gml:Y", pszY );

/* -------------------------------------------------------------------- */
/*      Add maxxy coordinate.                                           */
/* -------------------------------------------------------------------- */
    psCoord = CPLCreateXMLNode( psBox, CXT_Element, "gml:coord" );
    
    MakeGMLCoordinate( szCoordinate, sEnvelope.MaxX, sEnvelope.MaxY, 0.0, 
                       FALSE );
    pszY = strstr(szCoordinate,",") + 1;
    pszY[-1] = '\0';

    CPLCreateXMLElementAndValue( psCoord, "gml:X", szCoordinate );
    CPLCreateXMLElementAndValue( psCoord, "gml:Y", pszY );

    return psBox;
}

/************************************************************************/
/*                       OGR_G_ExportToGMLTree()                        */
/************************************************************************/

CPLXMLNode *OGR_G_ExportToGMLTree( OGRGeometryH hGeometry )

{
    char        *pszText;
    CPLXMLNode  *psTree;

    pszText = OGR_G_ExportToGML( hGeometry );
    if( pszText == NULL )
        return NULL;

    psTree = CPLParseXMLString( pszText );

    CPLFree( pszText );

    return psTree;
}

/************************************************************************/
/*                         OGR_G_ExportToGML()                          */
/************************************************************************/

char *OGR_G_ExportToGML( OGRGeometryH hGeometry )

{
    char        *pszText;
    int         nLength = 0, nMaxLength = 1;

    if( hGeometry == NULL )
        return CPLStrdup( "" );

    pszText = (char *) CPLMalloc(nMaxLength);
    pszText[0] = '\0';

    if( !OGR2GMLGeometryAppend( (OGRGeometry *) hGeometry, &pszText, 
                                &nLength, &nMaxLength ))
    {
        CPLFree( pszText );
        return NULL;
    }
    else
        return pszText;
}