double msGEOSLength(shapeObj *shape)
{
#if defined(USE_GEOS) && defined(GEOS_CAPI_VERSION_MAJOR) && defined(GEOS_CAPI_VERSION_MINOR) && (GEOS_CAPI_VERSION_MAJOR > 1 || GEOS_CAPI_VERSION_MINOR >= 1)
GEOSGeom g;
double length;
int result;
if(!shape) return -1;
if(!shape->geometry) /* if no geometry for the shape then build one */
shape->geometry = (GEOSGeom) msGEOSShape2Geometry(shape);
g = (GEOSGeom) shape->geometry;
if(!g) return -1;
result = GEOSLength(g, &length);
return ((result==0) ? -1 : length);
#elif defined(USE_GEOS)
msSetError(MS_GEOSERR, "GEOS support enabled, but old version lacks GEOSLength().", "msGEOSLength()");
return -1;
#else
msSetError(MS_GEOSERR, "GEOS support is not available.", "msGEOSLength()");
return -1;
#endif
}
Handle<Value> Geometry::GetLength(Local<String> name, const AccessorInfo& info)
{
HandleScope scope;
Geometry *geom = ObjectWrap::Unwrap<Geometry>(info.Holder());
double length;
int r = GEOSLength(geom->geos_geom_, &length);
if (r != 1)
return ThrowException(String::New("couldn't get length"));
Handle<Value> length_obj = Number::New(length);
return scope.Close(length_obj);
}
void geo_length(sqlite3_context *context,int argc,sqlite3_value **argv)
{
if(argc == 1 && sqlite3_value_type(argv[0]) == SQLITE_BLOB)
{
GEOSGeometry* geometry;
const void* data = sqlite3_value_blob(argv[0]);
size_t data_size = sqlite3_value_bytes(argv[0]);
_init_geos();
geometry = _geo_from_wkb((const unsigned char*)data,data_size);
if(geometry != 0)
{
double length = 0;
GEOSLength(geometry,&length);
sqlite3_result_double(context,length);
}
GEOSGeom_destroy(geometry);
finishGEOS();
}
}
bool Layer::registerFeature( const char *geom_id, PalGeometry *userGeom, double label_x, double label_y, const char* labelText,
double labelPosX, double labelPosY, bool fixedPos, double angle, bool fixedAngle,
int xQuadOffset, int yQuadOffset, double xOffset, double yOffset )
{
if ( !geom_id || label_x < 0 || label_y < 0 )
return false;
modMutex->lock();
if ( hashtable->find( geom_id ) )
{
modMutex->unlock();
//A feature with this id already exists. Don't throw an exception as sometimes,
//the same feature is added twice (dateline split with otf-reprojection)
return false;
}
// Split MULTI GEOM and Collection in simple geometries
GEOSGeometry *the_geom = userGeom->getGeosGeometry();
Feature* f = new Feature( this, geom_id, userGeom, label_x, label_y );
if ( fixedPos )
{
f->setFixedPosition( labelPosX, labelPosY );
}
if ( xQuadOffset != 0 || yQuadOffset != 0 )
{
f->setQuadOffset( xQuadOffset, yQuadOffset );
}
if ( xOffset != 0.0 || yOffset != 0.0 )
{
f->setPosOffset( xOffset, yOffset );
}
if ( fixedAngle )
{
f->setFixedAngle( angle );
}
// use layer-level defined rotation, but not if position fixed
if ( !fixedPos && angle != 0.0 )
{
f->setFixedAngle( angle );
}
bool first_feat = true;
double geom_size = -1, biggest_size = -1;
FeaturePart* biggest_part = NULL;
// break the (possibly multi-part) geometry into simple geometries
LinkedList <const GEOSGeometry*> *simpleGeometries = unmulti( the_geom );
if ( simpleGeometries == NULL ) // unmulti() failed?
{
modMutex->unlock();
throw InternalException::UnknownGeometry();
}
while ( simpleGeometries->size() > 0 )
{
const GEOSGeometry* geom = simpleGeometries->pop_front();
// ignore invalid geometries (e.g. polygons with self-intersecting rings)
if ( GEOSisValid( geom ) != 1 ) // 0=invalid, 1=valid, 2=exception
{
std::cerr << "ignoring invalid feature " << geom_id << std::endl;
continue;
}
int type = GEOSGeomTypeId( geom );
if ( type != GEOS_POINT && type != GEOS_LINESTRING && type != GEOS_POLYGON )
{
modMutex->unlock();
throw InternalException::UnknownGeometry();
}
FeaturePart* fpart = new FeaturePart( f, geom );
// ignore invalid geometries
if (( type == GEOS_LINESTRING && fpart->nbPoints < 2 ) ||
( type == GEOS_POLYGON && fpart->nbPoints < 3 ) )
{
delete fpart;
continue;
}
// polygons: reorder coordinates
if ( type == GEOS_POLYGON && reorderPolygon( fpart->nbPoints, fpart->x, fpart->y ) != 0 )
{
delete fpart;
continue;
}
if ( mode == LabelPerFeature && ( type == GEOS_POLYGON || type == GEOS_LINESTRING ) )
{
if ( type == GEOS_LINESTRING )
GEOSLength( geom, &geom_size );
else if ( type == GEOS_POLYGON )
GEOSArea( geom, &geom_size );
if ( geom_size > biggest_size )
{
biggest_size = geom_size;
delete biggest_part; // safe with NULL part
biggest_part = fpart;
}
continue; // don't add the feature part now, do it later
// TODO: we should probably add also other parts to act just as obstacles
}
// feature part is ready!
addFeaturePart( fpart, labelText );
first_feat = false;
}
delete simpleGeometries;
userGeom->releaseGeosGeometry( the_geom );
modMutex->unlock();
// if using only biggest parts...
if (( mode == LabelPerFeature || f->fixedPosition() ) && biggest_part != NULL )
{
addFeaturePart( biggest_part, labelText );
first_feat = false;
}
// add feature to layer if we have added something
if ( !first_feat )
{
features->push_back( f );
hashtable->insertItem( geom_id, f );
}
else
{
delete f;
}
return !first_feat; // true if we've added something
}
