MaplyVectorDatabase

@interface MaplyVectorDatabase : NSObject

The Maply Vector Database holds reference to a group of features that you can query.

This object wraps more complex database-like objects that contain geometric features. Primarily, that’s just shapefiles.

You can set this up and then query the database for features you’d like back. There’s an option to make a SQL query or you can just fetch all the vectors at once.

The point of this object is to keep most features out of memory until needed. However, a better way of doing that is probably using the MaplyPagingLayer.

  • Construct from a shapefile in the bundle

    Construct a MaplyVectorDatabase form a shapefile found in the app’s bundle. This will create a bounding box cache file and a sqlite database for the attributes to speed later lookups.

    Declaration

    Objective-C

    + (MaplyVectorDatabase *_Nonnull)vectorDatabaseWithShape:
    (NSString *_Nonnull)shapeName;

  • Construct from a shapefile in the bundle

    Construct a MaplyVectorDatabase form a shapefile found in the app’s bundle. This will create a bounding box cache file and a sqlite database for the attributes to speed later lookups.

    Declaration

    Objective-C

    - (nonnull instancetype)initWithShape:(NSString *_Nonnull)shapeName;

    Swift

    init(shape shapeName: String)

  • Construct from a shapfile in the apps documents

    Construct a MaplyVectorDabase from a shapefile found in the app’s bundle. This will create a bounding box cache file and a sqlite database for the attributes to speed later lookups.

    Declaration

    Objective-C

    - (nonnull instancetype)initWithShapefileInDocuments:
    (NSString *_Nonnull)shapeName;

    Swift

    init(shapefileInDocuments shapeName: String)

  • Return vectors that match the given SQL query

    Run a SQL query on the data, looking for vectors that match. These will be returned in a single MaplyVectorObject, or nil if there are none.

    Declaration

    Objective-C

    - (MaplyVectorObject *_Nullable)fetchMatchingVectors:
    (NSString *_Nonnull)sqlQuery;

    Swift

    func fetch(matchingVectors sqlQuery: String) -> MaplyVectorObject?

  • Search for all the areals that surround the given point (geographic)

    First this method does a bounding box check to eliminate areal features that won’t overlap at all. Then it runs a point in poly test on each feature that might. Every areal feature that overlaps is returned in the MaplyVectorObject.

    Declaration

    Objective-C

    - (MaplyVectorObject *_Nullable)fetchArealsForPoint:(MaplyCoordinate)coord;

    Swift

    func fetchAreals(forPoint coord: MaplyCoordinate) -> MaplyVectorObject?

  • Return all the vectors in the database.

    This method reads all the vectors in the database sequentially and returns them all in a MaplyVectorObject. This is basically how you read a shapefile in WhirlyGlobe-Maply.

    Declaration

    Objective-C

    - (MaplyVectorObject *_Nullable)fetchAllVectors;

    Swift

    func fetchAllVectors() -> MaplyVectorObject?