Too many redpins for annotation from KML file from Google map

Question

I don't need so many pins , they are crowding the area. I used the output of kml parser to draw the route between two points, how can I remove the extra pins between the route. I only need pins for beginning and ending. How do I reduce those excessive red pins\ from KML showing up.

// Locate the path to the route.kml file in the application's bundle
    // and parse it with the KMLParser.
    kml = [[KMLParser parseKMLAtPath:filePath] retain];

    // Add all of the MKOverlay objects parsed from the KML file to the map.
    NSArray *overlays = [kml overlays];
    [map addOverlays:overlays];

    // Add all of the MKAnnotation objects parsed from the KML file to the map.
    NSArray *annotations = [kml points];
    [map addAnnotations:annotations];

    // Walk the list of overlays and annotations and create a MKMapRect that
    // bounds all of them and store it into flyTo.
    MKMapRect flyTo = MKMapRectNull;
    for (id <MKOverlay> overlay in overlays) {
        if (MKMapRectIsNull(flyTo)) {
            flyTo = [overlay boundingMapRect];
        } else {
            flyTo = MKMapRectUnion(flyTo, [overlay boundingMapRect]);
        }
    }     //overlay



    for (id <MKAnnotation> annotation in annotations) {
        MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
        MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0, 0);
        if (MKMapRectIsNull(flyTo)) {
            flyTo = pointRect;
        } else {
            flyTo = MKMapRectUnion(flyTo, pointRect);
        }
    }        ///annotation


    // Position the map so that all overlays and annotations are visible on screen.
    map.visibleMapRect = flyTo;


  }


  - (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
   {
    return [kml viewForOverlay:overlay];
    }

  - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
   {

if ([[annotation title] isEqualToString:@"Destination"])
{
    MKPinAnnotationView *newAnnotation = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"greenpin"];
    newAnnotation.pinColor = MKPinAnnotationColorGreen;
    newAnnotation.animatesDrop = YES;
    newAnnotation.canShowCallout = YES;
    return newAnnotation;


}

else if ([[annotation title] isEqualToString:@"Current Location"])
{
    MKPinAnnotationView *newAnnotation = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"yellowpin"];
    newAnnotation.pinColor = MKPinAnnotationColorPurple;
    newAnnotation.animatesDrop = YES;
    newAnnotation.canShowCallout = YES;
    return newAnnotation;



}

else {

    return [kml viewForAnnotation:annotation];}
   }

score 1 · Answer 1 · answered Jan 07 '12 at 11:48

By this code all the annotations in [kml ponits] are added on map.

NSArray *annotations = [kml points];
    [map addAnnotations:annotations];

if you want only first and last annotation then simply add

NSArray *annotations = [kml points];
    [map addAnnotation:[annotations lastObject]];
    [map addAnnotation:[annotations objectAtIndex:0]];

score 0 · Answer 2 · edited May 23 '17 at 11:48

0

Check out this link to the Apple WWDC 2011 video, "Visualizing information geographically with MapKit", which shows their preferred design pattern for clustering MKAnnotation objects.

edited May 23 '17 at 11:48

Community

1
1

answered Dec 31 '11 at 04:05

paul.lander

458
4
5

Too many redpins for annotation from KML file from Google map

2 Answers2