Expose MGLMapView's zoomToSouthWestCoordinate:northEastCoordinate:animated: method in public header

[tomtaylor]

Is there a reason for not exposing MGLMapView's zoomToSouthWestCoordinate:northEastCoordinate:animated: method publicly? It's very useful to have.

(As an aside, being able to also pass a UIEdgeInsets to pad the zoomed area would be amazingly useful!)

[1ec5]

Covered by #1092 and #1433. Edge insets would be useful as well.

[tomtaylor]

Ah, thanks, understood. Do you know when this is planned for? It's my last issue with an RMMapView port that can't be easily worked around for now.

[picciano]

For what it's worth, here is the workaround I've been using. This one zooms to fit the current annotations, but as part of the process calculates SW and NE bounds. Adjust the globalWidth value to get the "fit" you need.

static float const minZoom = 1.0f;
static float const maxZoom = 16.0f;
static float const globeWidth = 800.0f;

+ (void)zoomToShowAnnotationsWithMapView:(MGLMapView *)mapView animated:(BOOL)animated {
    [[self class] zoomToShowAnnotationsWithMapView:mapView includeUserLocation:YES animated:animated];
}

+ (void)zoomToShowAnnotationsWithMapView:(MGLMapView *)mapView includeUserLocation:(BOOL)includeUserLocation animated:(BOOL)animated {

    if (mapView.annotations.count < 1) {
        return;
    }

    CLLocationCoordinate2D southWestCoordinate, northEastCoordinate;

    if (includeUserLocation) {
        southWestCoordinate = mapView.userLocation.location.coordinate;
        northEastCoordinate = mapView.userLocation.location.coordinate;
    } else {
        southWestCoordinate = ((TGAnnotation *)mapView.annotations[0]).coordinate;
        northEastCoordinate = ((TGAnnotation *)mapView.annotations[0]).coordinate;
    }


    for (TGAnnotation *annotation in mapView.annotations) {
        CLLocationCoordinate2D coordinate = annotation.coordinate;

        if (southWestCoordinate.latitude > coordinate.latitude) {
            southWestCoordinate.latitude = coordinate.latitude;
        }
        if (southWestCoordinate.longitude > coordinate.longitude) {
            southWestCoordinate.longitude = coordinate.longitude;
        }
        if (northEastCoordinate.latitude < coordinate.latitude) {
            northEastCoordinate.latitude = coordinate.latitude;
        }
        if (northEastCoordinate.longitude < coordinate.longitude) {
            northEastCoordinate.longitude = coordinate.longitude;
        }
    }

    CLLocationCoordinate2D center = CLLocationCoordinate2DMake((northEastCoordinate.latitude + southWestCoordinate.latitude) / 2, (northEastCoordinate.longitude + southWestCoordinate.longitude) / 2);

    CGFloat pixels = MIN(mapView.bounds.size.height, mapView.bounds.size.width);

    CGFloat angle = MAX(northEastCoordinate.latitude - southWestCoordinate.latitude, northEastCoordinate.longitude - southWestCoordinate.longitude);
    if (angle < 0) {
        angle += 360;
    }
    CGFloat calculatedZoom = log(pixels * 360 / angle / globeWidth) / log(2);
    CGFloat zoomLevel = MAX(MIN(calculatedZoom, maxZoom), minZoom);

    [mapView setCenterCoordinate:center zoomLevel:zoomLevel animated:animated];
}

[tomtaylor]

@picciano amazing, thanks!

[tomtaylor]

Great, thanks!

On 26 Jun 2015, at 06:10, Minh Nguyễn notifications@github.com wrote:

Closed #1775 via #1783.

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