MapView Polygon

1import UIKit
2import Nbmap
3class PolygonViewController: UIViewController {
4    var nbMapView: NGLMapView! {
5        didSet {
6            oldValue?.removeFromSuperview()
7            if let mapView = nbMapView {
8                view.insertSubview(mapView, at: 0)
9            }
10        }
11    }
12    
13    override func viewDidLoad() {
14        super.viewDidLoad()
15        nbMapView = NGLMapView(frame:self.view.bounds)
16        nbMapView.delegate = self
17        drawPolygon()
18    }
19    
20    func drawPolygon(){
21        let locations: [CLLocationCoordinate2D] =  [
22            CLLocationCoordinate2D(latitude: 12.94798778, longitude: 77.57375084),
23            CLLocationCoordinate2D(latitude: 12.93669616, longitude: 77.57385337),
24            CLLocationCoordinate2D(latitude: 12.93639637, longitude: 77.58031279),
25            CLLocationCoordinate2D(latitude: 12.94808770, longitude: 77.58000520)
26        ]
27        if let currentAnnotations = nbMapView.annotations {
28            nbMapView.removeAnnotations(currentAnnotations)
29        }
30              
31        let polygon: NGLPolygon = NGLPolygon.init(coordinates: locations, count: 4)
32        nbMapView.addAnnotation(polygon)
33    }
34}
35extension PolygonViewController: NGLMapViewDelegate {
36    func mapView(_ mapView: NGLMapView, didFinishLoading style: NGLStyle){
37        
38        let camera = NGLMapCamera(lookingAtCenter: CLLocationCoordinate2DMake(12.94798778, 77.57375084),
39                                                                      acrossDistance:10000,
40                                                                               pitch:0,
41                                                                             heading:0)
42        nbMapView.fly(to: camera)
43    
44    }
45    /**
46     Returns the alpha value to use when rendering a shape annotation.
47     A value of `0.0` results in a completely transparent shape. A value of `1.0`,
48     the default, results in a completely opaque shape.
49     This method sets the opacity of an entire shape, inclusive of its stroke and
50     fill. To independently set the values for stroke or fill, specify an alpha
51     component in the color returned by `-mapView:strokeColorForShapeAnnotation:` or
52     `-mapView:fillColorForPolygonAnnotation:`.
53     @param mapView The map view rendering the shape annotation.
54     @param annotation The annotation being rendered.
55     @return An alpha value between `0` and `1.0`.
56     */
57    func mapView(_ mapView: NGLMapView, alphaForShapeAnnotation annotation: NGLShape) -> CGFloat  {
58        return 1.0
59    }
60    /**
61     Returns the color to use when rendering the outline of a shape annotation.
62     The default stroke color is the map view's tint color. If a pattern color is
63     specified, the result is undefined.
64     Opacity may be set by specifying an alpha component. The default alpha value is
65     `1.0` and results in a completely opaque stroke.
66     @param mapView The map view rendering the shape annotation.
67     @param annotation The annotation being rendered.
68     @return A color to use for the shape outline.
69     */
70    func mapView(_ mapView: NGLMapView, strokeColorForShapeAnnotation annotation: NGLShape) -> UIColor  {
71        return UIColor.red
72    }
73    /**
74     Returns the color to use when rendering the fill of a polygon annotation.
75     The default fill color is the map view's tint color. If a pattern color is
76     specified, the result is undefined.
77     Opacity may be set by specifying an alpha component. The default alpha value is
78     `1.0` and results in a completely opaque shape.
79     @param mapView The map view rendering the polygon annotation.
80     @param annotation The annotation being rendered.
81     @return The polygon's interior fill color.
82     */
83    
84    func mapView(_ mapView: NGLMapView, fillColorForPolygonAnnotation annotation: NGLPolygon) -> UIColor  {
85        return UIColor.blue
86    }
87   
88    /**
89     Returns the line width in points to use when rendering the outline of a
90     polyline annotation.
91     By default, the polyline is outlined with a line `3.0` points wide.
92     @param mapView The map view rendering the polygon annotation.
93     @param annotation The annotation being rendered.
94     @return A line width for the polyline, measured in points.
95     */
96    func mapView(_ mapView: NGLMapView, lineWidthForPolylineAnnotation annotation: NGLPolyline) -> CGFloat  {
97        return 3.0
98    }
99    
100    /**
101     Tells the delegate that one of its annotations was selected.
102     You can use this method to track changes in the selection state of annotations.
103     If the annotation is associated with an annotation view, you can also implement
104     `-mapView:didSelectAnnotationView:`, which is called immediately after this
105     method is called.
106     @param mapView The map view containing the annotation.
107     @param annotation The annotation that was selected.
108     */
109    func mapView(_ mapView: NGLMapView, didSelect annotation: NGLAnnotation){
110        let title = (annotation.title ?? "") ?? ""
111        print("didSelect title:" + title)
112        let subtitle = (annotation.subtitle ?? "") ?? ""
113        print("didSelect subtitle:" + subtitle)
114    }
115    /**
116     Tells the delegate that one of its annotations was deselected.
117     You can use this method to track changes in the selection state of annotations.
118     If the annotation is associated with an annotation view, you can also implement
119     `-mapView:didDeselectAnnotationView:`, which is called immediately after this
120     method is called.
121     @param mapView The map view containing the annotation.
122     @param annotation The annotation that was deselected.
123     */
124    func mapView(_ mapView: NGLMapView, didDeselect annotation: NGLAnnotation){
125        let title = (annotation.title ?? "") ?? ""
126        print("didDeselect title:" + title)
127        let subtitle = (annotation.subtitle ?? "") ?? ""
128        print("didDeselect subtitle:" + subtitle)
129    }
130}