如何在GMSMapView中显示一个圆 [英] How to display a circle in GMSMapView

问题描述

我需要在GMSMapView上显示一个圆圈（与MKCircle一样）。使用MKMapView和MKCircle时很容易，但不能在GMSMapView中使用MKCircle。
任何想法？

更新：

这是当前（18.03.2013）选项：

1.包含圆形的地面标记图片。

2.由多段（多段线）组成的圆圈。

编辑：

3。 Google添加了GMSCircle（23.04.2013）

  GMSGroundOverlayOptions * overlayOptions = [GMSGroundOverlayOptions options]; 
 overlayOptions.icon = [UIImage imageNamed：@circle]; 
 overlayOptions.position = touchMapCoordinate; 
 overlayOptions.bearing = 0; 
 overlayOptions.zoomLevel = 14.3; 
 [mapView addGroundOverlayWithOptions：overlayOptions]; 
  

对于40x40像素的圆形图像，它看起来不错。 （半径约为100米）

细分路径解决方案：

  GMSPolylineOptions * circle = [GMSPolylineOptions options]; 
 CGPoint touchPoint = [mapView.projection pointForCoordinate：touchMapCoordinate]; 
 GMSMutablePath * path = [GMSMutablePath path]; 
 
 CGPoint circlePoint; （int i = 0; i <360; i ++）
 {
 circlePoint.x = touchPoint.x + radius * cos（i * M_PI / 180）; 
 
。 
 circlePoint.y = touchPoint.y + radius * sin（i * M_PI / 180）; 
 
 CLLocationCoordinate2D aux = [mapView.projection coordinateForPoint：circlePoint]; 
 [path addCoordinate：aux]; 
} 
 
 circle.path = path; 
 circle.width = 1; 
 
 [mapView addPolylineWithOptions：circle]; 
  

编辑：08.05.2013

GMSCircle解决方案：

  CLLocationCoordinate2D circleCenter = CLLocationCoordinate2DMake（latitude，longitude）; 
 GMSCircle * circ = [GMSCircle circleWithPosition：circleCenter 
 radius：1000]; 
 
 circ.fillColor = [UIColor blueColor]; 
 circ.strokeColor = [UIColor redColor]; 
 circ.strokeWidth = 5; 
 circ.map = mapView; 
  

解决方案

目前SDK不支持圈子，但有一项功能请求可在此处添加圈子：

https://code.google.com/p/gmaps-api-issues/issues/detail?id=4971

在此期间，您可以通过绘制多段线来创建一个圆圈，并有几个短段？

I need to display a circle (as with MKCircle) on a GMSMapView. This is easy when using a MKMapView and MKCircle, but can't use MKCircle with GMSMapView. Any ideas?

Update:
This are the current(18.03.2013) options:
1. A ground marker containing a circle image.
2. A a circle made with several segments (polyline).

Edit:
3. Google added a GMSCircle (23.04.2013)

 GMSGroundOverlayOptions *overlayOptions = [GMSGroundOverlayOptions options];
    overlayOptions.icon = [UIImage imageNamed:@"circle"];
    overlayOptions.position = touchMapCoordinate;
    overlayOptions.bearing = 0;
    overlayOptions.zoomLevel = 14.3;
 [mapView addGroundOverlayWithOptions:overlayOptions];

For a circle image 40x40 pixels it looks ok. (radius is approximately 100 m)

Small segmented path solution:

    GMSPolylineOptions *circle = [GMSPolylineOptions options];
    CGPoint touchPoint = [mapView.projection pointForCoordinate:touchMapCoordinate];
    GMSMutablePath *path = [GMSMutablePath path];

    CGPoint circlePoint;

    for (int i = 0; i < 360; i++)
    { 
        circlePoint.x = touchPoint.x + radius * cos(i*M_PI/180);
        circlePoint.y = touchPoint.y + radius * sin(i*M_PI/180);

        CLLocationCoordinate2D aux = [mapView.projection coordinateForPoint:circlePoint];
        [path addCoordinate:aux];
    }

    circle.path = path;
    circle.width = 1;

    [mapView addPolylineWithOptions:circle];

EDIT : 08.05.2013

GMSCircle solution:

     CLLocationCoordinate2D circleCenter = CLLocationCoordinate2DMake(latitude, longitude);
     GMSCircle *circ = [GMSCircle circleWithPosition:circleCenter
                                     radius:1000];

     circ.fillColor = [UIColor blueColor];
     circ.strokeColor = [UIColor redColor];
     circ.strokeWidth = 5;
     circ.map = mapView;

解决方案

At the moment the SDK doesn't support circles, but there is a feature request to add circles here:

https://code.google.com/p/gmaps-api-issues/issues/detail?id=4971

In the meantime you could maybe fake a circle by drawing a polyline, with several short segments?

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