intro to mapping apps

8/11/2019 Intro to Mapping Apps

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An introduction to

building mapping

applications for theiPhone and iPadDr Alasdair Allan, Babilim Light Industries

Wednesday, 29 September 2010


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Frameworks

Core Location

Map Kit



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Core Location(and the GPS)



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Core Location

Abstraction layer

Cell towers (12km falling to 1-3km)

Skyhook wireless (approx. 100m)

GPS (approx. 40m)



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Core Location

LocationManager = [[CLLocationManageralloc] init];

locationManager.delegate = self;

if( locationManager.locationServicesEnabled ) {

[locationManager startUpdatingLocation];

} else {

...

}



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Distance lters

locationManager.distanceFilter = 1000; // 1km



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Desired accuracy

locationManager.desiredAccuracy = kCLLocationAccuracyKilometer;



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Delegate methods

- (void)locationManager:(CLLocationManager*)manager didUpdateToLocation:

(CLLocation*)newLocation fromLocation:(CLLocation*)oldLocation {

if( newLocation != oldLocation ) {

...

}

}

-

(void)locationManager:(CLLocationManager*)manager didFailWithError:

(NSError*)error { ...

}



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The Magnetometer(The Digital Compass)



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Core Location

LocationManager = [[CLLocationManageralloc] init];

locationManager.delegate = self;

if( locationManager.locationServicesEnabled &&

locationManager.headingAvailable) {

[locationManager startUpdatingLocation];

[locationManager startUpdatingHeading];

} else {

...

}



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Heading lters

locationManager.headingFilter = 5; // 5 degrees



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Delegate method

- (void)locationManager:(CLLocationManager*) manager

didUpdateHeading:(CLHeading*) newHeading {

// If the accuracy is valid, process the event.

if (newHeading.headingAccuracy > 0) {

CLLocationDirectiontheHeading = newHeading.magneticHeading;

...

}

}



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True heading

CLLocationDirectiontrueHeading = newHeading.trueHeading;



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Device orientation

Heading = X degrees



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Device orientation

Heading = X + 90 degrees



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Device orientationfloatrealHeading = heading;

switch(orientation) {

caseUIDeviceOrientationPortrait:

break;

caseUIDeviceOrientationPortraitUpsideDown:

realHeading = realHeading + 180.0f;

break;

caseUIDeviceOrientationLandscapeLeft:

realHeading = realHeading + 90.0f;

break;

caseUIDeviceOrientationLandscapeRight:

realHeading = realHeading - 90.0f;

break;

default:

break;

}

while ( realHeading > 360.0f ) {

realHeading = realHeading - 360.0f;

}



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Calibration panel

- (BOOL)locationManagerShouldDisplayHeadingCalibration:(CLLocationManager*)manager {

return YES;

}



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Frameworks

Core Location

Map Kit



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Frameworks

Core Location

Map Kit



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Map Kit



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@interfaceRootController: UIViewController {

MKMapView*mapView;

}

@property(nonatomic, retain) IBOutletMKMapView*mapView;

@end

View Controller



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Interface Builder



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Delegate methods

- (void)locationManager:(CLLocationManager*)manager didUpdateToLocation:

(CLLocation*)newLocation fromLocation:(CLLocation*)oldLocation {

if( newLocation != oldLocation ) {

doublemiles = 2.0;

doublescale = ABS(cos(2*M_PI*newLocation.coordinate.latitude/360.0));

MKCoordinateSpanspan;

span.latitudeDelta = miles/69.0;

span.longitudeDelta = miles/( scale*69.0 );

MKCoordinateRegionregion;

region.span = span;

region.center = newLocation.coordinate; [self.mapView setRegion:region animated:YES];

self.mapView.showsUserLocation = YES;

}

}



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@interfaceSimpleAnnotation: NSObject {

CLLocationCoordinate2Dcoordinate;

NSString*title;

NSString*subtitle;

}

@property(nonatomic, assign) CLLocationCoordinate2Dcoordinate;

@property(nonatomic, retain) NSString*title;

@property(nonatomic, retain) NSString*subtitle;

- (id)initWithCoordinate:(CLLocationCoordinate2D)coord;

@end

MKAnnotation



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MKAnnotation@implementationSimpleAnnotation

@synthesize coordinate;

@synthesizetitle;

@synthesize subtitle;

- (id)initWithCoordinate:(CLLocationCoordinate2D)coord {if ( self = [super init] ) {

self.coordinate = coord;

}

return self;

}

- (void)dealloc {

[title release];

[subtitle release];

[super dealloc];

}

@end



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Adding annotations

SimpleAnnotation *annotation = [[SimpleAnnotationalloc] initWithCoordinate:theCoords];

annotation.title = theTitle;

annotation.subtitle = theSubTitle;

MKCoordinateRegionregion = { theCoords, {0.2, 0.2} };

[mapView setRegion:region animated:NO];

[mapView addAnnotation: annotation];

[annotation release];



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Frameworks

Core Location

Map Kit



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Going Further



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Location SDKs



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Location SDKs



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Further Readinghttp://learningiphoneprogramming.comhttp://programmingiphonesensors.com



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Further Reading

Get 35% offof the print book and

40% offof the ebook version by

entering discount code ABF10.

http://learningiphoneprogramming.comhttp://programmingiphonesensors.com



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OReilly Masterclass

Get 40% offby entering discount code ABF10.

http://oreilly.com/go/location-sensors/



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OReilly Masterclass

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free..." promotion all through September by

entering discount code BVGVF.

http://oreilly.com/go/location-sensors/

http://oreilly.com/videos/http://oreilly.com/videos/http://oreilly.com/videos/http://oreilly.com/videos/http://oreilly.com/videos/http://oreilly.com/videos/


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intro to mapping apps

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