FT2GMapsHelper.m

//
//  FT2GMapsHelper.m
//  Mercedes Map Test
//
//  Created by Baldoph Pourprix on 10/04/2013.
//  Copyright (c) 2013 Fuerte Int. All rights reserved.
//

#import "FT2GMapsHelper.h"
#import "NSData+Coordinates.h"

@implementation FT2GMapsHelper

CLLocationCoordinate2D coordinatesForDictionary(NSDictionary *dict)
{
	CLLocationDegrees latitude = [dict[@"lat"] doubleValue];
	CLLocationDegrees longitude = [dict[@"lng"] doubleValue];
	return CLLocationCoordinate2DMake(latitude, longitude);
}

+ (NSMutableArray *)decodePolyline:(NSString *)encodedStr
{
    NSMutableString *encoded = [[NSMutableString alloc] initWithCapacity:[encodedStr length]];
    [encoded appendString:encodedStr];
    [encoded replaceOccurrencesOfString:@"\\\\" withString:@"\\"
                                options:NSLiteralSearch
                                  range:NSMakeRange(0, [encoded length])];
    NSInteger len = [encoded length];
    NSInteger index = 0;
    NSMutableArray *array = [[NSMutableArray alloc] init];
    NSInteger lat=0;
    NSInteger lng=0;
    while (index < len) {
        NSInteger b;
        NSInteger shift = 0;
        NSInteger result = 0;
        do {
            b = [encoded characterAtIndex:index++] - 63;
            result |= (b & 0x1f) << shift;
            shift += 5;
        } while (b >= 0x20);
        NSInteger dlat = ((result & 1) ? ~(result >> 1) : (result >> 1));
        lat += dlat;
        shift = 0;
        result = 0;
        do {
            b = [encoded characterAtIndex:index++] - 63;
            result |= (b & 0x1f) << shift;
            shift += 5;
        } while (b >= 0x20);
        NSInteger dlng = ((result & 1) ? ~(result >> 1) : (result >> 1));
        lng += dlng;
        NSNumber *latitude = [[NSNumber alloc] initWithFloat:lat * 1e-5];
        NSNumber *longitude = [[NSNumber alloc] initWithFloat:lng * 1e-5];
        //          printf("[%f,", [latitude doubleValue]);
        //          printf("%f]", [longitude doubleValue]);
		CLLocationCoordinate2D coordinates = CLLocationCoordinate2DMake(latitude.doubleValue, longitude.doubleValue);
        [array addObject:[NSData dataWithCoordinates:coordinates]];
    }
    return array;
}

@end