如何在谷歌地图目标上旋转自定义标记图像c [英] How to rotate custom marker image on google map objective c

问题描述

目前，我正在开发像Uber iOS应用程序这样的应用程序。我已经集成了Google Maps SDK，并且还显示了用户当前位置的自定义图像。目前，我正在从服务器获取一些驾驶员当前的位置详细信息（例如：100驱动程序）。我保存在一个 NSArray 中，我尝试显示那些 Lat&

  for（int i = 0; i< [latLongArr count]; i ++）
 {
 GMSMarker * marker = [[GMSMarker alloc] init]; 
 marker.position = CLLocationCoordinate2DMake（[[（NSDictionary *）[latLongArr objectAtIndex：i] valueForKey：@Latitude] doubleValue]，[[（NSDictionary *）[latLongArr objectAtIndex：i] valueForKey：@Longitude ] doubleValue]）; 
 marker.appearAnimation = kGMSMarkerAnimationPop; 
 marker.title = @标题; 
 marker.snippet = @Sub title; 
 marker.map = self.gMapView; 
} 
  

但是我正在寻找 UIDesign&功能如下：

Can任何一个帮助我怎么能显示用户当前位置&驱动程序的注释列表

（如何在Google地图上旋转自定义标记图像）

解决方案

在方向API（苹果或谷歌地图）有一个列表点。因此，要计算两点之间的角度，您可以：

  func DegreeBearing（A：CLLocation，B：CLLocation） - > ; Double {
 var dlon = self.ToRad（B.coordinate.longitude  -  A.coordinate.longitude）
 let dPhi = log（tan（self.ToRad（B.coordinate.latitude）/ 2 + M_PI / 4）/ tan（self.toRad（A.coordinate.latitude）/ 2 + M_PI / 4））
 if abs（dlon）> M_PI {
 dlon =（dlon> 0）？ （dlon  -  2 * M_PI）：（2 * M_PI + dlon）
} 
 return self.ToBearing（atan2（dlon，dPhi））
} 
 
 func ToRad（度数：双精度） - >双{
返程度*（M_PI / 180）
} 
 
 func ToBearing（弧度：双精度） - > Double {
 return（ToDegrees（弧度）+ 360）％360 
} 
 
 func ToDegrees（弧度：双倍） - >双{
返回弧度* 180 / M_PI 
} 
  

并为制造商设置轮转

  maker.rotation = DegreeBearing（self.fromPoint，B：self.toPoint）
  

下面更新了ObjC代码

   - （double）DegreeBearing：（CLLocation *）locationB ：（CLLocation *）B {
 double dlon = [self ToRad：（B.coordinate.longitude  -  A.coordinate.longitude）]; 
 double dPhi = log（tan（[self ToRad：（B.coordinate.latitude）] / 2 + M_PI / 4）/ tan（[self ToRad：（A.coordinate.latitude）] / 2 + M_PI / 4））; 
 if（fabs（dlon）> M_PI）{
 dlon =（dlon> 0）？ （dlon-2 * M_PI）:( 2 * M_PI + dlon）; 
} 
 return [self ToBearing：（atan2（dlon，dPhi））]; 
 
 $ b  - （double）ToRad :(双）度{
返回度*（M_PI / 180）; 
 
 $ b  - （double）ToBearing：（double）radians {
 double degree = [self ToDegrees：radians]; 
回报度+ 360％360; 
} 
 
  - （double）ToDegrees：（double）radians {
返回弧度* 180 / M_PI; 
} 
  

Currently i am working an app like Uber iOS application. I Already integrated Google Maps SDK and I showed custom image for User current location also. Currently I am getting some Driver's Current location details(Ex: 100 Driver's) from server. I saved in one NSArray and I tried to display those Lat & Long on GoogleMaps by using following code:

for(int i=0;i<[latLongArr count];i++)
{
    GMSMarker *marker = [[GMSMarker alloc] init];
    marker.position = CLLocationCoordinate2DMake([[(NSDictionary *)[latLongArr objectAtIndex:i] valueForKey:@"Latitude"] doubleValue], [[(NSDictionary *)[latLongArr objectAtIndex:i] valueForKey:@"Longitude"] doubleValue]);
    marker.appearAnimation = kGMSMarkerAnimationPop;
    marker.title = @"Title";
    marker.snippet = @"Sub title";
    marker.map = self.gMapView;
}

But I am looking UIDesign & Functionality like this:

Can Any one help me out how can I show User Current location & Driver's list of Annotations
(How to rotate custom marker image on google map)

解决方案

In directions API (apple or google map) have a list points. So , to calculate the angle between two points, you can:

func DegreeBearing(A:CLLocation,B:CLLocation)-> Double{
    var dlon = self.ToRad(B.coordinate.longitude - A.coordinate.longitude)
    let dPhi = log(tan(self.ToRad(B.coordinate.latitude) / 2 + M_PI / 4) / tan(self.ToRad(A.coordinate.latitude) / 2 + M_PI / 4))
    if  abs(dlon) > M_PI{
        dlon = (dlon > 0) ? (dlon - 2*M_PI) : (2*M_PI + dlon)
    }
    return self.ToBearing(atan2(dlon, dPhi))
}

func ToRad(degrees:Double) -> Double{
    return degrees*(M_PI/180)
}

func ToBearing(radians:Double)-> Double{
    return (ToDegrees(radians) + 360) % 360
}

func ToDegrees(radians:Double)->Double{
    return radians * 180 / M_PI
}

and set rotation for maker

maker.rotation = DegreeBearing(self.fromPoint, B: self.toPoint)

Updated ObjC Code below

-(double) DegreeBearing:(CLLocation*) A locationB: (CLLocation*)B{
    double dlon = [self ToRad:(B.coordinate.longitude - A.coordinate.longitude)];
    double dPhi = log(tan([self ToRad:(B.coordinate.latitude)] / 2 + M_PI / 4) / tan([self ToRad:(A.coordinate.latitude)] / 2 + M_PI / 4));
    if  (fabs(dlon) > M_PI){
        dlon = (dlon > 0) ? (dlon - 2*M_PI) : (2*M_PI + dlon);
    }
    return [self ToBearing:(atan2(dlon, dPhi))];
}

-(double) ToRad: (double)degrees{
    return degrees*(M_PI/180);
}

-(double) ToBearing:(double)radians{
    double degree = [self ToDegrees:radians];
    return degree+360% 360;
}

-(double) ToDegrees:(double)radians{
    return radians * 180 / M_PI;
}

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