GoogleMap API为两点之间的方向提供了错误的坐标

问题描述

我想在iOS 6.1上提供支持，所以我使用GoogleMap，了解iOS7的恢复情况。

我使用GoogleMap API来显示GoogleMap上两点之间的绘制方向。

使用下面的代码进行解析并获取坐标的步骤以在地图上绘制折线：

 
 NSURL * url = [[NSURL alloc] initWithString：[str stringByAddingPercentEscapesUsingEncoding：NSUTF8StringEncoding]]; 
 
 NSURLRequest * request = [NSURLRequest requestWithURL：url cachePolicy：NSURLRequestUseProtocolCachePolicy timeoutInterval：60.0]; 
 
 NSData * data = [NSURLConnection sendSynchronousRequest：request returningResponse：nil error：nil]; 
 NSError *错误; 
 
 NSDictionary * json = [NSJSONSerialization JSONObjectWithData：data options：kNilOptions error：& error]; 
 
 NSArray * latestRoutes = [json objectForKey：@routes]; 
 
 NSMutableDictionary * legs = [[[latestRoutes objectAtIndex：0] objectForKey：@legs] objectAtIndex：0]; 
 
 NSArray * steps = [legs objectForKey：@steps]; 
 
 NSString * startLocation，* endLocation，* totalDistance，* totalDuration; 
 CLLocationCoordinate2D startLoc，endLoc; 
 startLocation = [legs objectForKey：@start_address]; 
 endLocation = [legs objectForKey：@end_address]; 
 totalDistance = [[legs objectForKey：@distance] objectForKey：@text]; 
 totalDuration = [[leg objectForKey：@duration] objectForKey：@text]; 
 startLoc = CLLocationCoordinate2DMake（[[legs objectForKey：@start_location] objectForKey：@lat] doubleValue] [[[legs objectForKey：@start_location] objectForKey：@lng] doubleValue]） ; 
 endLoc = CLLocationCoordinate2DMake（[[[legs objectForKey：@end_location] objectForKey：@lat] doubleValue]，[[[legs objectForKey：@end_location] objectForKey：@lng] doubleValue]） ; 
 
 NSMutableDictionary * tempDict; 
 if（[steps count]！= 0）{
 GMSMutablePath * path = [GMSMutablePath path]; 
 for（int idx = 0; idx< [steps count] +2; idx ++）{
 
 CLLocationCoordinate2D workingCoordinate; 
 
 if（idx == 0）{
 
 workingCoordinate = startLoc; 
 
 [path addCoordinate：workingCoordinate]; 
 
 
 else if（idx == [steps count] +1）{
 
 workingCoordinate = endLoc; 
 
 [path addCoordinate：workingCoordinate]; 
 
 $ {b 
 $ b workingCoordinate = CLLocationCoordinate2DMake（[[[[steps [objectAtIndex：idx-1] objectForKey：@start_location] objectForKey：@lat] floatValue] ，[[[steps objectAtIndex：idx-1] objectForKey：@start_location] objectForKey：@lng] floatValue]）; 
 
 [path addCoordinate：workingCoordinate]; 
 
} 
 tempDict = nil; 
} 
 //根据点数组创建多段线。 
 
 GMSPolyline * rectangle = [GMSPolyline polylineWithPath：path]; 
 
 rectangle.strokeWidth = 5.0; 
 
 rectangle.map = mapView_; 
} 
  

它只提供24个步骤，意味着只有24个坐标点创建并绘制Line on地图如下图所示：

你可以看到这条线路不在正确的道路上，所以我能做些什么来解决这个问题？
i也希望在地图上显示方向。

解决方案

下面的答案适用于两个位置之间的平滑路径@ABáo：

您可以比较此代码的屏幕截图以前的截图，我用于问问题：

I am using GoogleMap API for showing draw direction between two points on GoogleMap.

i want to give support on iOS 6.1 so i use GoogleMap i know about iOS7 recover this.

using below code for parsing and get Steps for coordinates to draw polyline on Map:

NSString *str=@"http://maps.googleapis.com/maps/api/directions/json?origin=bharuch,gujarat&destination=vadodara,gujarat&sensor=false";

NSURL *url=[[NSURL alloc]initWithString:[str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0];

NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];
     NSError* error;

NSDictionary* json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];

NSArray* latestRoutes = [json objectForKey:@"routes"];

NSMutableDictionary *legs=[[[latestRoutes objectAtIndex:0] objectForKey:@"legs"] objectAtIndex:0];

NSArray *steps=[legs objectForKey:@"steps"];

NSString *startLocation,*endLocation,*totalDistance,*totalDuration;
     CLLocationCoordinate2D startLoc,endLoc;
     startLocation = [legs  objectForKey:@"start_address"];
     endLocation = [legs objectForKey:@"end_address"];
     totalDistance = [[legs objectForKey:@"distance"] objectForKey:@"text"];
     totalDuration = [[legs objectForKey:@"duration"] objectForKey:@"text"];
     startLoc=CLLocationCoordinate2DMake([[[legs objectForKey:@"start_location"] objectForKey:@"lat"] doubleValue], [[[legs objectForKey:@"start_location"] objectForKey:@"lng"] doubleValue]);
     endLoc=CLLocationCoordinate2DMake([[[legs objectForKey:@"end_location"] objectForKey:@"lat"] doubleValue], [[[legs objectForKey:@"end_location"] objectForKey:@"lng"] doubleValue]);

     NSMutableDictionary *tempDict;
     if ([steps count]!=0) {
         GMSMutablePath *path = [GMSMutablePath path];
         for(int idx = 0; idx < [steps count]+2; idx++){

            CLLocationCoordinate2D workingCoordinate;

            if (idx==0) {

                workingCoordinate=startLoc;

                [path addCoordinate:workingCoordinate];

            }
            else if (idx==[steps count]+1){

                workingCoordinate=endLoc;

                [path addCoordinate:workingCoordinate];
            }
            else{

                workingCoordinate=CLLocationCoordinate2DMake([[[[steps objectAtIndex:idx-1] objectForKey:@"start_location"] objectForKey:@"lat"] floatValue], [[[[steps objectAtIndex:idx-1] objectForKey:@"start_location"] objectForKey:@"lng"] floatValue]);

                [path addCoordinate:workingCoordinate];

            }
            tempDict = nil;
        }
        // create the polyline based on the array of points.

        GMSPolyline *rectangle = [GMSPolyline polylineWithPath:path];

        rectangle.strokeWidth=5.0;

        rectangle.map = mapView_;
    }

its gives only 24 steps means only 24 Coordinates for create point and draw Line on Map which is shown as below image:

you can see that line is not on proper road so what can i do to solve this?i also want to show direction on map too.

解决方案

Below answer is for smooth path between two location with help of @A Báo:

Screenshot of this code you can compare it with previous screenshot which i used in asking Question:

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