How to get coordinates at specific distance in a path - ios

Question

I am using google map ios sdk, My problem is i have to get coordinates for every 1000 meter on a poly line in map. now i am able to get number of location in given path and able to accesses them using the following code snip.
-(NSMutableArray*)getCoordinates {
pathCoordinatesArray = [[NSMutableArray alloc]init];
GMSMutablePath *path = [VTDirectionManager getPath];
NSLog(#"count %d",path.count);
for (int i=0 ; i<path.count; i++) {
if (i+1 > path.count) {
return pathCoordinatesArray;
}
for (int j = i+1; j<path.count; j++) {
CLLocationCoordinate2D sourceCoordinate = [path coordinateAtIndex:i];
CLLocation *sourceLocation = [[CLLocation alloc]initWithLatitude:sourceCoordinate.latitude longitude:sourceCoordinate.longitude];
CLLocationCoordinate2D destinationCoordinate = [path coordinateAtIndex:j];
CLLocation *destinationLocation = [[CLLocation alloc]initWithLatitude:destinationCoordinate.latitude longitude:destinationCoordinate.longitude];
BOOL check ;
check = [self checkDistanceForSource:sourceLocation andDestination:destinationLocation];
//jump to next 1000 distance position
if (check) {
i = j;
}
}
}
return pathCoordinatesArray;
}
-(BOOL)checkDistanceForSource:(CLLocation*)source andDestination:(CLLocation*)destination {
CLLocationDistance distance = [source distanceFromLocation:destination];
if (distance > 1000) {
CLLocation *location = [[CLLocation alloc] initWithLatitude:destination.coordinate.latitude longitude:destination.coordinate.longitude];
[pathCoordinatesArray addObject:location];
return YES;
}
return NO;
}
Suppose if i have 5000 meter distance path , then i have to get 5 coordinates ,each at 1000 meters position sequentially.
i think it is wrong code . Suggest me with optimized code
see the image each points are 1000 metered distance .

Answer 1

Please change your loop code like this
for (int i=0 ; i<path.count; i++) {
if (pathCoordinatesArray.count == 0) {
CLLocationCoordinate2D temp2d = [path coordinateAtIndex:i];
CLLocation *tempLoc = [[CLLocation alloc]initWithLatitude:temp2d.latitude longitude:temp2d.longitude];
[pathCoordinatesArray addObject:tempLoc];
}
CLLocationCoordinate2D destinationCoordinate = [path coordinateAtIndex:i];
CLLocation *destinationLocation = [[CLLocation alloc]initWithLatitude:destinationCoordinate.latitude longitude:destinationCoordinate.longitude];
[self checkDistanceForSource:[pathCoordinatesArray lastObject] andDestination:destinationLocation];
}
}