在地图上绘制

添加标注

在滴图地图中表示标注的基础数据类型是DMKPointAnnotation，先创建一个DMKPointAnnotation，设定好经纬度和一些其他信息，然后再mapView的回调方法中构造DMKPinAnnotationView，就可以在地图中加上标注

CLLocationCoordinate2D location = CLLocationCoordinate2DMake(40.043616, 116.290276);
    DMKPointAnnotation* annotation = [[DMKPointAnnotation alloc]init];
[annotation setCoordinate:location];
annotation.title = @"我是标题";
annotation.subtitle = @"我是描述我是描述";
self.annotation = annotation;
[self.mapView addAnnotation:annotation];

代理方法实现：

#pragma mark - MapView Delegate

- (DMKAnnotationView *)mapView:(DMKMapView *)mapView viewForAnnotation:(id<DMKAnnotation>)annotation {
    if([annotation isKindOfClass:[DMKPointAnnotation class]]) {
        DMKPinAnnotationView *view = [[DMKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"annotation"];
        view.imageIcon = [UIImage imageNamed:@"taxi"];
        view.mDrawMode = DIMAGE_MIDDLE_CENTER_MODE;
        view.canShowCallout = YES;
        return view;
    }
    return nil;
}

添加多边形

添加多边形的方法和添加标注类似，表示多边形的基础数据类型是DMKPolygon，先创建一个DMKPolygon，设定好各个顶点的经纬度，添加到mapView，然后再mapView的回调方法中构造DMKPolygonRenderer，设置颜色、线宽等参数，就可以在地图中加上多边形

int count = 10;
CLLocationCoordinate2D *coord =  malloc(sizeof(CLLocationCoordinate2D) * count);
    
coord[0] = CLLocationCoordinate2DMake(40.051879,116.295569);
coord[1] = CLLocationCoordinate2DMake(40.052388,116.297908);
coord[2] = CLLocationCoordinate2DMake(40.049940,116.298638);
coord[3] = CLLocationCoordinate2DMake(40.047789,116.299560);
coord[4] = CLLocationCoordinate2DMake(40.044323,116.301792);
coord[5] = CLLocationCoordinate2DMake(40.042171,116.296363);
coord[6] = CLLocationCoordinate2DMake(40.045128,116.295483);
coord[7] = CLLocationCoordinate2DMake(40.045456,116.296599);
coord[8] = CLLocationCoordinate2DMake(40.047394,116.296942);
coord[9] = CLLocationCoordinate2DMake(40.049530,116.296299);
    
DMKPolygon* polygon1 = [DMKPolygon polygonWithCoordinates:coord count:count];
[self.mapView addOverlay:polygon1];
    
free(coord);

在回调方法中创建表示多边形的view：

-(DMKOverlayRenderer*)mapView:(DMKMapView *)mapView viewForOverlay:(id<DMKOverlay>)overlay
{
    if ([overlay isKindOfClass:[DMKPolygon class]])
    {
        DMKPolygonRenderer *polygonRenderer = [[DMKPolygonRenderer alloc] initWithPolygon:overlay];
        polygonRenderer.lineWidth = 8.f;
        polygonRenderer.strokeColor = [UIColor colorWithRed:0 green:0 blue:1 alpha:0.6];
        return polygonRenderer;
    }
    return nil;
}

绘制线覆盖物（Polyline）

根据道路上的点的数据，可以在地图上绘制路线覆盖物。代码如下：

//构造折线数据对象
CLLocationCoordinate2D coords[4];

coords[0].latitude = 39.832136;
coords[0].longitude = 116.34095;

coords[1].latitude = 39.832136;
coords[1].longitude = 116.42095;

coords[2].latitude = 39.902136;
coords[2].longitude = 116.42095;

coords[3].latitude = 39.902136;
coords[3].longitude = 116.44095;

DMKPolyline *polyline = [DMKPolyline polylineWithCoordinates:coords count:4];

[self.mapView addOverlay:polyline];

mapView收到polyline数据后，会通过delegate方法- (DMKOverlayRenderer *)mapView:(DMKMapView *)mapView viewForOverlay:(id <DMKOverlay>)overlay请求调用方构造一个OverlayRenderer用于绘制，这里可以直接使用DMKPolylineRenderer：

- (DMKOverlayRenderer *)mapView:(DMKMapView *)mapView viewForOverlay:(id <DMKOverlay>)overlay {
    if ([overlay isKindOfClass:[DMKPolyline class]])
    {
        DMKPolylineRenderer *polylineRenderer = [[DMKPolylineRenderer alloc] initWithPolyline:overlay];
        polylineRenderer.lineWidth = 8.f;
        polylineRenderer.strokeColor = [UIColor colorWithRed:0 green:1 blue:0 alpha:0.6];        
        return polylineRenderer;
    }
    return nil;
}

绘制圆圈（Circle）

根据一个经纬度数据，设置圆圈半径，可以在地图上绘制圆圈。代码如下：

DMKCircle *circle = [DMKCircle circleWithCenterCoordinate:CLLocationCoordinate2DMake(40.048126, 116.2814) radius:5000];
self.circle = circle;
[self.mapView addOverlay:circle];

mapView收到circle数据后，会通过delegate方法- (DMKOverlayRenderer *)mapView:(DMKMapView *)mapView viewForOverlay:(id <DMKOverlay>)overlay请求调用方构造一个OverlayRenderer用于绘制，这里可以直接使用DMKCircleRenderer：

- (DMKOverlayRenderer *)mapView:(DMKMapView *)mapView viewForOverlay:(id <DMKOverlay>)overlay {
    if ([overlay isKindOfClass:[DMKCircle class]])
    {
        DMKCircleRenderer *circleRenderer = [[DMKCircleRenderer 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];
        return circleRenderer;
    }
    return nil;
}

其他更多用法请参照地图SDK API文档