绘制面最后更新时间: 2021年03月10日

绘制圆

通过 MACircle 类绘制圆，圆是由中心点（经纬度）和半径（米）构成。

在地图绘制圆的步骤如下：

（1）在ViewController.m的viewDidLoad方法中根据中心点和半径构造圆对象。

//构造圆
MACircle *circle = [MACircle circleWithCenterCoordinate:CLLocationCoordinate2DMake(39.952136, 116.50095) radius:5000];
    
//在地图上添加圆
[_map addOverlay: circle];

let circle: MACircle = MACircle(center: CLLocationCoordinate2D(latitude: 39.952136, longitude: 116.50095), radius: 5000)
map.add(circle)

（2）继续在ViewController.m文件中，实现协议中的map:rendererForOverlay:回调函数，设置圆的样式。示例代码如下：

Objective-C Swift

- (MAOverlayRenderer *)map:(MAMap *)map rendererForOverlay:(id <maoverlay>)overlay
{
    if ([overlay isKindOfClass:[MACircle class]])
    {
        MACircleRenderer *circleRenderer = [[MACircleRenderer alloc] initWithCircle:overlay];
        
        circleRenderer.lineWidth    = 5.f;
        circleRenderer.strokeColor  = [UIColor colorWithRed:0.6 green:0.6 blue:0.6 alpha:0.8];
        circleRenderer.fillColor    = [UIColor colorWithRed:1.0 green:0.8 blue:0.0 alpha:0.8];
        circleRenderer.lineDashType = kMALineDashTypeSquare;
        return circleRenderer;
    }
    return nil;
}

func map(_ map: MAMap!, rendererFor overlay: MAOverlay!) -> MAOverlayRenderer! {
	if overlay.isKind(of: MACircle.self) {
		let renderer: MACircleRenderer = MACircleRenderer(overlay: overlay)
		renderer.lineWidth = 5.0
		renderer.strokeColor = UIColor.init(red: 0.6, green: 0.6, blue: 0.6, alpha: 0.8)
		renderer.fillColor = UIColor.init(red: 1.0, green: 0.8, blue: 0.0, alpha: 0.8)
            
		return renderer
	}
}

运行程序，效果如下所示：

绘制polygon

通过 MAPolygon 类绘制polygon，polygon是由封闭的经纬度点构成。

在地图绘制polygon的步骤如下：

（1）在ViewController.m的viewDidLoad方法中构造MAPolygon对象。

Objective-C Swift

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    CLLocationCoordinate2D rectPoints[4];
    rectPoints[0].latitude = 39.887600;
    rectPoints[0].longitude = 116.518932;
    
    rectPoints[1].latitude = 39.781892;
    rectPoints[1].longitude = 116.518932;
    
    rectPoints[2].latitude = 39.781892;
    rectPoints[2].longitude = 116.428932;
    
    rectPoints[3].latitude = 39.887600;
    rectPoints[3].longitude = 116.428932;
    MAPolygon *rectangle = [MAPolygon polygonWithCoordinates:rectPoints count:4];
    ///添加矩形覆盖物
    [self.map addOverlay:rectangle];
}

override func viewDidLoad() {
	super.viewDidLoad()
        
    // polygon
	var polygonCoordinates: [CLLocationCoordinate2D] = [
		CLLocationCoordinate2D(latitude: 39.887600, longitude: 116.518932),
		CLLocationCoordinate2D(latitude: 39.781892, longitude: 116.518932),
		CLLocationCoordinate2D(latitude: 39.781892, longitude: 116.428932),
		CLLocationCoordinate2D(latitude: 39.887600, longitude: 116.428932)]
        
	let polygon: MAPolygon = MAPolygon(coordinates: &polygonCoordinates, count: UInt(polygonCoordinates.count))
	///添加矩形覆盖物
    self.map.add(polygon)
}

（2）继续在ViewController.m文件中，实现协议中的map:rendererForOverlay:回调函数，设置MAPolygon的样式。示例代码如下：

Objective-C Swift

- (MAOverlayRenderer *)map:(MAMap *)map rendererForOverlay:(id <MAOverlay>)overlay
{
    if ([overlay isKindOfClass:[MAPolygon class]])
    {
        MAPolygonRenderer *polygonRenderer = [[MAPolygonRenderer alloc] initWithPolygon:overlay];
        polygonRenderer.lineWidth   = 4.f;
        polygonRenderer.strokeColor = [UIColor colorWithRed:0 green:1 blue:0 alpha:1];
        polygonRenderer.fillColor   = [UIColor redColor];
        polygonRenderer.alpha = 0.8;
        polygonRenderer.isVisible = YES;
        return polygonRenderer;
    }
    return nil;
}

func map(_ map: MAMap!, rendererFor overlay: MAOverlay!) -> MAOverlayRenderer! {
	if overlay.isKind(of: MAPolygon.self) {
		let renderer: MAPolygonRenderer = MAPolygonRenderer(overlay: overlay)
		renderer.lineWidth = 4.0
		renderer.strokeColor = UIColor.init(red: 0, green: 1, blue: 0, alpha: 1)
		renderer.fillColor = UIColor.red
        renderer.alpha = 0.8
        return renderer
	}
	return nil
}

运行程序，效果如下所示：

绘制面 最后更新时间: 2021年03月10日

绘制圆

绘制polygon

绘制面最后更新时间: 2021年03月10日