feat: Add circles in map detail

Sources/Earthquake Network/Controllers/Seismic Networks/SeismicNetworksMapDetailViewController.swift

@@ -60,6 +60,8 @@ class SeismicNetworksMapDetailViewController: EQNBaseMapViewController {
     
     private let seismic: EQNSisma
     private var allSeismics: [EQNSisma]
+    /// Contains circles drawed on the map
+    private var mapCircles = [MKCircle]()
     
     // MARK: - Init
     
@@ -88,6 +90,15 @@ class SeismicNetworksMapDetailViewController: EQNBaseMapViewController {
         let annotations = allSeismics.map { EQNMapAnnotationSeismic(seismic: $0) }
         
         updateMap(with: annotations)
+        
+        // if the given seismic is still in the data source, show circles
+        // otherwise just remove any other circles already on the map
+        if allSeismics.contains(seismic) {
+            addCircles(for: seismic.coordinate)
+        } else {
+            addCircles(for: nil)
+        }
+        
         loadFiltersRecap()
     }
     
@@ -125,7 +136,28 @@ class SeismicNetworksMapDetailViewController: EQNBaseMapViewController {
         seismicsFilterLabel.text = recap
     }
     
-    
+    private func addCircles(for location: CLLocation?) {
+        // remove any previous circles
+        mapView.removeOverlays(mapCircles)
+        mapCircles.removeAll()
+        
+        // aggiungiamo 3 cerchi concentrici per il punto specificato (se disponibile)
+        // li inseriamo a a 50, 100 e 200 km.
+        guard let location = location else { return }
+        
+        let circles = [
+            MKCircle(center: location.coordinate, radius: 25_000),
+            MKCircle(center: location.coordinate, radius: 100_000),
+            MKCircle(center: location.coordinate, radius: 200_000)
+        ]
+        
+        // !!note: is important to assign here the circles
+        // otherwise `addOverlays` will not work
+        mapCircles = circles
+        
+        // creo nuovi cerchi
+        mapView.addOverlays(circles)
+    }
     
     // MARK: - Actions
     
@@ -154,6 +186,17 @@ class SeismicNetworksMapDetailViewController: EQNBaseMapViewController {
         
         return annotationView
     }
+    
+    func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) -> MKOverlayRenderer {
+        guard let circleOverlay = overlay as? MKCircle else {
+            return MKOverlayRenderer(overlay: overlay)
+        }
+        
+        let circle = MKCircleRenderer(overlay: circleOverlay)
+        circle.strokeColor = AppTheme.Colors.darkGray
+        circle.lineWidth = 1.0
+        return circle
+    }
 }
 
 extension SeismicNetworksMapDetailViewController: SeismicFiltersViewControllerDelegate {

Sources/Earthquake Network/Models/EQNSisma.m

@@ -115,5 +115,21 @@
     return self;
 }
 
+#pragma mark - Equatable
+
+- (BOOL)isEqual:(id)other
+{
+    if ([other isKindOfClass:[EQNSisma class]]) {
+        EQNSisma *otherSisma = (EQNSisma *)other;
+        return [otherSisma.coordinate isEqual:self.coordinate] && otherSisma.intensity.doubleValue == self.intensity.doubleValue;
+    }
+    return NO;
+}
+
+- (NSUInteger)hash
+{
+    return [self.coordinate hash];
+}
+
 
 @end