Draw Shapes

Drawing primitives programmatically on the map using MapLibre shape sources.

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Draw a point

func drawPoint(_ coord: CLLocationCoordinate2D) {
    if let source = rawMapView?.style?.source(withIdentifier: "point-source") as? MLNShapeSource {
        let point = MLNPointFeature()
        point.coordinate = coord
        source.shape = point
    }
}

Draw multiple points

func drawPoints(_ coords: [CLLocationCoordinate2D]) {
    if let source = rawMapView?.style?.source(withIdentifier: "point-source") as? MLNShapeSource {
        let features = coords.map { coord -> MLNPointFeature in
            let feature = MLNPointFeature()
            feature.coordinate = coord
            return feature
        }
        source.shape = MLNShapeCollectionFeature(shapes: features)
    }
}

Draw a line

func drawLine(_ coords: [CLLocationCoordinate2D]) {
    guard coords.count >= 2 else { return }
    var mutableCoords = coords
    if let source = rawMapView?.style?.source(withIdentifier: "line-source") as? MLNShapeSource {
        source.shape = MLNPolylineFeature(coordinates: &mutableCoords, count: UInt(mutableCoords.count))
    }
}

Draw a polygon

func drawPolygon(_ coords: [CLLocationCoordinate2D]) {
    guard coords.count >= 3 else { return }
    var mutableCoords = coords
    if let source = rawMapView?.style?.source(withIdentifier: "polygon-source") as? MLNShapeSource {
        source.shape = MLNPolygonFeature(coordinates: &mutableCoords, count: UInt(mutableCoords.count))
    }
}

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See also: iOS Map SDK overview.