How to compare two region of map view and find their difference?

[Ndpiparava]

Hi,Guys.
Is there anybody knows how can we compare two different region of map view and find the difference between them.

Thanks In Advance.

[Duncan C]

Originally Posted by Ndpiparava

Hi,Guys.
Is there anybody knows how can we compare two different region of map view and find the difference between them.

Thanks In Advance.

What do you mean by the difference between 2 regions? Do you want to calculate the map distance between the center of two map regions?

To do that, get the center coordinate of each region, and create a CLLocation object for each (using the method initWithLatitude:longitude

Once you have 2 CLLocation objects, you can send one of them the message distanceFromLocation: to calculate the distance between the 2 locations.

[Ndpiparava]

Originally Posted by Duncan C

What do you mean by the difference between 2 regions? Do you want to calculate the map distance between the center of two map regions?

To do that, get the center coordinate of each region, and create a CLLocation object for each (using the method initWithLatitude:longitude

Once you have 2 CLLocation objects, you can send one of them the message distanceFromLocation: to calculate the distance between the 2 locations.

Hi Duncan.Thanks For Reply.I am really happy that you answer my question.As you asked what is difference of region.So, I am giving you some code.I hope that will make my question very clear.


MKCoordinateRegion mapregion1,mapregion2;
MKMapRect mapRect1 = [self mapRectForCoordinateRegion:mapregion1];

MKMapRect mapRect2 = [self mapRectForCoordinateRegion:mapregion2];

MKMapRect maprectintersection = MKMapRectIntersection(mapRect1, mapRect2);

maprectintersection is a common rectangle part between two region that i can find but i want to difference between them.I hope i made myself clear.


//Method will convert map region into maprect
- (MKMapRect)mapRectForCoordinateRegionMKCoordinat eRegion)coordinateRegion
{
CLLocationCoordinate2D topLeftCoordinate =
CLLocationCoordinate2DMake(coordinateRegion.center .latitude
+ (coordinateRegion.span.latitudeDelta/2.0),
coordinateRegion.center.longitude
- (coordinateRegion.span.longitudeDelta/2.0));

MKMapPoint topLeftMapPoint = MKMapPointForCoordinate(topLeftCoordinate);

CLLocationCoordinate2D bottomRightCoordinate =
CLLocationCoordinate2DMake(coordinateRegion.center .latitude
- (coordinateRegion.span.latitudeDelta/2.0),
coordinateRegion.center.longitude
+ (coordinateRegion.span.longitudeDelta/2.0));

MKMapPoint bottomRightMapPoint = MKMapPointForCoordinate(bottomRightCoordinate);

MKMapRect mapRect = MKMapRectMake(topLeftMapPoint.x,
topLeftMapPoint.y,
fabs(bottomRightMapPoint.x-topLeftMapPoint.x),
fabs(bottomRightMapPoint.y-topLeftMapPoint.y));

return mapRect;
}


Thanks In Advance.
Nitin.