本文介绍了如何在GMSMapView中显示一个圆的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

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 {
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:



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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08-15 08:55