Path limit

[riki-dexter]

Hi, is there a limit to coordinates array length to build a path overlay? I need to draw about 3000 CLLocationCoordinate2D on the map, but i'm getting MBStaticErrorDomain" - code: 18446744073709551615 when getting image from Snapshot object. Until 1500 CLLocationCoordinate2D works well, I'm getting right the map.

Thank you.

[frederoni]

I'm not aware of any limitations on the snapshot. Would you mind sharing a code snippet?

[riki-dexter]

I wrote this code:

               var pathArr = [CLLocationCoordinate2D]()
               for workoutLocation in self.workoutLocations {
                    pathArr.append(workoutLocation.coordinate)
                }
                                
                var path = Path(coordinates: pathArr)
                path.strokeWidth = 2
                path.strokeColor = .black

                let options = SnapshotOptions(
                    styleURL: URL(string: "mapbox://styles/r****")!,
                    size: CGSize(width: 200, height: 200))
                options.overlays = [path]
                let snapshot = Snapshot(
                    options: options,
                    accessToken: "****")

                snapshot.image { (image, error) in
                    let img: UIImage = image!
                    print("")
                }

[frederoni]

I don't see any issues when using 3000 coordinates but I start getting "MBStaticErrorDomain Code=-1 server errors" after 4000. Might be due to the custom style. @1ec5 do you know if we have any hard limitations on the number of coordinates in a path?

If you are using the Maps SDK for iOS, it might be of interest to use the newly introduced MGLMapSnaphotter which renders the snapshot client side.

[riki-dexter]

How can I set path overlay to MGLMapSnapshotOptions?

Thank you

[frederoni]

You would have to add an MGLPolylineFeature to the map view itself. Similar to https://www.mapbox.com/ios-sdk/examples/line-geojson/

[riki-dexter]

Sorry but I don't have a map view. I only have an array of CLLocationCoordinate2D and I would get an image of the map fragment with the overlay path.

[frederoni]

Sorry but I don't have a map view.

Ok, then the static api is the way to go. Trying to figure out if there is a limit.

[1ec5]

do you know if we have any hard limitations on the number of coordinates in a path?

Not on the number of coordinates specifically, but according to the Static API documentation, there is a restriction on the number of features in a GeoJSON overlay, as well as a restriction on the length of the string encoding of all the overlays combined:

Overlays cannot consist of more than 100 features. The maximum overlay length is 2083 characters.

A Path’s string-encoded length depends on the Polyline encoding of all the coordinates, plus any styling options.

[trunghvbk]

Hi, a long time passed, how is this issue going? Do we have any number of limit coordinates to pass to the Path?