緯度/経度を使用して 2 点間のルートを描画する必要があるアプリケーションを開発しています。
Apple API を使用してポリラインを取得し、デコード後に描画しました。
問題:
- ルートが道路の中央にない(添付画像_1)か、ルートがずれている
以下はコードです:
NSString* saddr = [NSString stringWithFormat:@"%@,%@",self.lat1.text,self.long1.text];
NSString* daddr = [NSString stringWithFormat:@"%@,%@",self.lat2.text,self.long2.text];
NSString* apiUrlStr = [NSString stringWithFormat:@"http://maps.apple.com/maps/api/directions/json?origin=%@&destination=%@&sensor=false", saddr, daddr];
NSURL* apiUrl = [NSURL URLWithString:apiUrlStr];
NSError *error;
NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl encoding:NSUTF8StringEncoding error:&error];
NSData *responseData = [apiResponse dataUsingEncoding:NSUTF8StringEncoding];
NSError* error1;
NSDictionary* json = [NSJSONSerialization JSONObjectWithData:responseData
options:NSJSONReadingMutableLeaves
error:&error1];
NSLog(@"Error: %@\n%@",[error1 localizedDescription],[error1 localizedFailureReason]);
if([[json objectForKey:@"status"] isEqualToString:@"OK"])
{
NSArray *routes1 = [json objectForKey:@"routes"];
NSDictionary *route = [routes1 lastObject];
if (route)
{
NSString *overviewPolyline = [[route objectForKey: @"overview_polyline"] objectForKey:@"points"];
routes = [self decodePolyLine:overviewPolyline];
//NSLog(@"%@",[routes objectAtIndex:0]);
[self updateRouteView];
[self centerMap];
}
}
-(void) updateRouteView
{
NSInteger numberOfSteps = routes.count;
CLLocationCoordinate2D coordinates[numberOfSteps];
for (NSInteger index = 0; index < numberOfSteps; index++) {
CLLocation *location = [routes objectAtIndex:index];
CLLocationCoordinate2D coordinate = location.coordinate;
coordinates[index] = coordinate;
}
MKPolyline *polyLine = [MKPolyline polylineWithCoordinates:coordinates count:numberOfSteps];
[self.mapView addOverlay:polyLine];
}