static void ParseMultiPolygon(OGRMultiPolygon* poMultiPoly, json_object* poArcsObj,
json_object* poArcsDB, ScalingParams* psParams)
{
int nPolys = json_object_array_length(poArcsObj);
for(int i=0; i<nPolys; i++)
{
OGRPolygon* poPoly = new OGRPolygon();
poMultiPoly->addGeometryDirectly(poPoly);
json_object* poPolyArcs = json_object_array_get_idx(poArcsObj, i);
if( poPolyArcs != NULL && json_type_array == json_object_get_type(poPolyArcs) )
{
ParsePolygon(poPoly, poPolyArcs, poArcsDB, psParams);
}
}
}
static void ParseObject(const char* pszId,
json_object* poObj, OGRGeoJSONLayer* poLayer,
json_object* poArcsDB, ScalingParams* psParams)
{
json_object* poType = OGRGeoJSONFindMemberByName(poObj, "type");
if( poType == NULL || json_object_get_type(poType) != json_type_string )
return;
const char* pszType = json_object_get_string(poType);
json_object* poArcsObj = OGRGeoJSONFindMemberByName(poObj, "arcs");
json_object* poCoordinatesObj = OGRGeoJSONFindMemberByName(poObj, "coordinates");
if( strcmp(pszType, "Point") == 0 || strcmp(pszType, "MultiPoint") == 0 )
{
if( poCoordinatesObj == NULL || json_type_array != json_object_get_type(poCoordinatesObj) )
return;
}
else
{
if( poArcsObj == NULL || json_type_array != json_object_get_type(poArcsObj) )
return;
}
if( pszId == NULL )
{
json_object* poId = OGRGeoJSONFindMemberByName(poObj, "id");
if( poId != NULL &&
(json_type_string == json_object_get_type(poId) ||
json_type_int == json_object_get_type(poId)) )
{
pszId = json_object_get_string(poId);
}
}
OGRFeature* poFeature = new OGRFeature(poLayer->GetLayerDefn());
if( pszId != NULL )
poFeature->SetField("id", pszId);
json_object* poProperties = OGRGeoJSONFindMemberByName(poObj, "properties");
if( poProperties != NULL && json_type_object == json_object_get_type(poProperties) )
{
json_object* poName = OGRGeoJSONFindMemberByName(poProperties, "name");
if( poName != NULL && json_type_string == json_object_get_type(poName) )
{
const char* pszName = json_object_get_string(poName);
poFeature->SetField("name", pszName);
}
}
OGRGeometry* poGeom = NULL;
if( strcmp(pszType, "Point") == 0 )
{
double dfX = 0.0, dfY = 0.0;
if( ParsePoint( poCoordinatesObj, &dfX, &dfY ) )
{
dfX = dfX * psParams->dfScale0 + psParams->dfTranslate0;
dfY = dfY * psParams->dfScale1 + psParams->dfTranslate1;
poGeom = new OGRPoint(dfX, dfY);
}
else
poGeom = new OGRPoint();
}
else if( strcmp(pszType, "MultiPoint") == 0 )
{
OGRMultiPoint* poMP = new OGRMultiPoint();
poGeom = poMP;
int nTuples = json_object_array_length(poCoordinatesObj);
for(int i=0; i<nTuples; i++)
{
json_object* poPair = json_object_array_get_idx(poCoordinatesObj, i);
double dfX = 0.0, dfY = 0.0;
if( ParsePoint( poPair, &dfX, &dfY ) )
{
dfX = dfX * psParams->dfScale0 + psParams->dfTranslate0;
dfY = dfY * psParams->dfScale1 + psParams->dfTranslate1;
poMP->addGeometryDirectly(new OGRPoint(dfX, dfY));
}
}
}
else if( strcmp(pszType, "LineString") == 0 )
{
OGRLineString* poLS = new OGRLineString();
poGeom = poLS;
ParseLineString(poLS, poArcsObj, poArcsDB, psParams);
}
else if( strcmp(pszType, "MultiLineString") == 0 )
{
OGRMultiLineString* poMLS = new OGRMultiLineString();
poGeom = poMLS;
ParseMultiLineString(poMLS, poArcsObj, poArcsDB, psParams);
}
else if( strcmp(pszType, "Polygon") == 0 )
{
OGRPolygon* poPoly = new OGRPolygon();
poGeom = poPoly;
ParsePolygon(poPoly, poArcsObj, poArcsDB, psParams);
}
else if( strcmp(pszType, "MultiPolygon") == 0 )
{
OGRMultiPolygon* poMultiPoly = new OGRMultiPolygon();
poGeom = poMultiPoly;
ParseMultiPolygon(poMultiPoly, poArcsObj, poArcsDB, psParams);
}
if( poGeom != NULL )
poFeature->SetGeometryDirectly(poGeom);
poLayer->AddFeature(poFeature);
delete poFeature;
}