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// Copyright 2020 Esri
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
import UIKit
import ArcGIS
class NearestVertexViewController: UIViewController {
// MARK: Properties
/// The map view managed by the view controller.
@IBOutlet var mapView: AGSMapView! {
didSet {
mapView.map = makeMap()
mapView.graphicsOverlays.add(makeGraphicsOverlay())
mapView.setViewpointCenter(polygon.extent.center, scale: 8e6)
mapView.touchDelegate = self
mapView.callout.isAccessoryButtonHidden = true
}
}
/// The example polygon geometry near San Bernardino County, California.
let polygon: AGSPolygon = {
let polygonBuilder = AGSPolygonBuilder(spatialReference: .statePlaneCaliforniaZone5)
polygonBuilder.addPointWith(x: 6627416.41469281, y: 1804532.53233782)
polygonBuilder.addPointWith(x: 6669147.89779046, y: 2479145.16609522)
polygonBuilder.addPointWith(x: 7265673.02678292, y: 2484254.50442408)
polygonBuilder.addPointWith(x: 7676192.55880379, y: 2001458.66365744)
polygonBuilder.addPointWith(x: 7175695.94143837, y: 1840722.34474458)
return polygonBuilder.toGeometry()
}()
/// The graphic for the tapped location point.
let tappedLocationGraphic: AGSGraphic = {
let symbol = AGSSimpleMarkerSymbol(style: .X, color: .orange, size: 15)
return AGSGraphic(geometry: nil, symbol: symbol)
}()
/// The graphic for the nearest coordinate point.
let nearestCoordinateGraphic: AGSGraphic = {
let symbol = AGSSimpleMarkerSymbol(style: .diamond, color: .red, size: 10)
return AGSGraphic(geometry: nil, symbol: symbol)
}()
/// The graphic for the nearest vertex point.
let nearestVertexGraphic: AGSGraphic = {
let symbol = AGSSimpleMarkerSymbol(style: .circle, color: .blue, size: 15)
return AGSGraphic(geometry: nil, symbol: symbol)
}()
/// A distance formatter to format distance measurements and units.
let distanceFormatter: MeasurementFormatter = {
let formatter = MeasurementFormatter()
formatter.numberFormatter.maximumFractionDigits = 1
formatter.numberFormatter.minimumFractionDigits = 1
return formatter
}()
// MARK: Methods
/// Create a map.
/// - Returns: A new `AGSMap` object.
func makeMap() -> AGSMap {
let map = AGSMap(spatialReference: .statePlaneCaliforniaZone5)
let usStatesGeneralizedLayer = AGSFeatureLayer(
item: AGSPortalItem(
portal: .arcGISOnline(withLoginRequired: false),
itemID: "99fd67933e754a1181cc755146be21ca"),
layerID: 0
)
map.basemap.baseLayers.add(usStatesGeneralizedLayer)
return map
}
func makeGraphicsOverlay() -> AGSGraphicsOverlay {
let polygonFillSymbol = AGSSimpleFillSymbol(
style: .forwardDiagonal,
color: .green,
outline: AGSSimpleLineSymbol(style: .solid, color: .green, width: 2)
)
// The graphic for the polygon.
let polygonGraphic = AGSGraphic(geometry: polygon, symbol: polygonFillSymbol)
let graphicsOverlay = AGSGraphicsOverlay()
graphicsOverlay.graphics.addObjects(from: [
polygonGraphic,
nearestCoordinateGraphic,
tappedLocationGraphic,
nearestVertexGraphic
])
return graphicsOverlay
}
// MARK: UIViewController
override func viewDidLoad() {
super.viewDidLoad()
// Add the source code button item to the right of navigation bar.
(navigationItem.rightBarButtonItem as? SourceCodeBarButtonItem)?.filenames = ["NearestVertexViewController"]
}
}
private extension AGSSpatialReference {
/// California zone 5 (ftUS) state plane coordinate system.
static let statePlaneCaliforniaZone5 = AGSSpatialReference(wkid: 2229)!
}
// MARK: - AGSGeoViewTouchDelegate
extension NearestVertexViewController: AGSGeoViewTouchDelegate {
func showCallout(at mapPoint: AGSPoint) {
// Get nearest vertex and nearest coordinate results.
let nearestVertexResult = AGSGeometryEngine.nearestVertex(in: polygon, to: mapPoint)!
let nearestCoordinateResult = AGSGeometryEngine.nearestCoordinate(in: polygon, to: mapPoint)!
// Set the geometries for the tapped, nearest coordinate and
// nearest vertex point graphics.
nearestVertexGraphic.geometry = nearestVertexResult.point
nearestCoordinateGraphic.geometry = nearestCoordinateResult.point
// Get the distance to the nearest vertex in the polygon.
let distanceVertex = Measurement(
value: nearestVertexResult.distance,
unit: UnitLength.feet
)
// Get the distance to the nearest coordinate in the polygon.
let distanceCoordinate = Measurement(
value: nearestCoordinateResult.distance,
unit: UnitLength.feet
)
// Display the results in a callout at tapped location.
mapView.callout.title = "Proximity result"
mapView.callout.detail = String(
format: "Vertex dist: %@; Point dist: %@",
distanceFormatter.string(from: distanceVertex),
distanceFormatter.string(from: distanceCoordinate)
)
mapView.callout.show(for: tappedLocationGraphic, tapLocation: mapPoint, animated: true)
}
func geoView(_ geoView: AGSGeoView, didTapAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
if mapView.callout.isHidden {
// If the callout is hidden, show it at the normalized map point.
guard let normalizedMapPoint = AGSGeometryEngine.normalizeCentralMeridian(of: mapPoint) as? AGSPoint else { return }
tappedLocationGraphic.geometry = normalizedMapPoint
showCallout(at: normalizedMapPoint)
} else {
// Dismiss the callout and reset geometries.
mapView.callout.dismiss()
tappedLocationGraphic.geometry = nil
nearestVertexGraphic.geometry = nil
nearestCoordinateGraphic.geometry = nil
}
}
}
