Find closest facility from point

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 /* Copyright 2024 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.  *  */  package com.esri.arcgismaps.sample.findclosestfacilityfrompoint.components  import android.app.Application import androidx.lifecycle.AndroidViewModel import androidx.lifecycle.viewModelScope import com.arcgismaps.Color import com.arcgismaps.geometry.Point import com.arcgismaps.geometry.SpatialReference import com.arcgismaps.mapping.ArcGISMap import com.arcgismaps.mapping.BasemapStyle import com.arcgismaps.mapping.Viewpoint import com.arcgismaps.mapping.symbology.PictureMarkerSymbol import com.arcgismaps.mapping.symbology.SimpleLineSymbol import com.arcgismaps.mapping.symbology.SimpleLineSymbolStyle import com.arcgismaps.mapping.symbology.SimpleMarkerSymbol import com.arcgismaps.mapping.symbology.SimpleMarkerSymbolStyle import com.arcgismaps.mapping.view.Graphic import com.arcgismaps.mapping.view.GraphicsOverlay import com.arcgismaps.mapping.view.SingleTapConfirmedEvent import com.arcgismaps.tasks.networkanalysis.ClosestFacilityParameters import com.arcgismaps.tasks.networkanalysis.ClosestFacilityResult import com.arcgismaps.tasks.networkanalysis.ClosestFacilityTask import com.arcgismaps.tasks.networkanalysis.Facility import com.arcgismaps.tasks.networkanalysis.Incident import com.esri.arcgismaps.sample.findclosestfacilityfrompoint.R import com.esri.arcgismaps.sample.sampleslib.components.MessageDialogViewModel import kotlinx.coroutines.launch  class MapViewModel(private var application: Application) : AndroidViewModel(application) {   // List of hospital facilities in the San Diego area  private var facilitiesList = listOf(  Facility(Point(-1.3042129900625112E7, 3860127.9479775648, SpatialReference.webMercator())),  Facility(Point(-1.3042193400557665E7, 3862448.873041752, SpatialReference.webMercator())),  Facility(Point(-1.3046882875518233E7, 3862704.9896770366, SpatialReference.webMercator())),  Facility(Point(-1.3040539754780494E7, 3862924.5938606677, SpatialReference.webMercator())),  Facility(Point(-1.3042571225655518E7, 3858981.773018156, SpatialReference.webMercator())),  Facility(Point(-1.3039784633928463E7, 3856692.5980474586, SpatialReference.webMercator())),  Facility(Point(-1.3049023883956768E7, 3861993.789732541, SpatialReference.webMercator()))  )   // Create graphic overlay of facilities to display on the map  private val facilityGraphicsOverlay = GraphicsOverlay()   // Create graphic overlay of incident to display on map tapped  private val incidentGraphicsOverlay = GraphicsOverlay()   // Create a ViewModel to handle dialog interactions  private val messageDialogVM: MessageDialogViewModel = MessageDialogViewModel()   // Add the graphics overlays to be used by the composable MapView  val graphicsOverlays = listOf(facilityGraphicsOverlay, incidentGraphicsOverlay)   // Create a streets basemap layer and change the position of map to center around San Diego  val map = ArcGISMap(BasemapStyle.ArcGISStreets).apply {  initialViewpoint = Viewpoint(  latitude = 32.727,  longitude = -117.1750,  scale = 100000.0  )  }   init {  // Create the facility symbol  val facilityUrl = application.getString(R.string.hospital_symbol_url)  val facilitySymbol = PictureMarkerSymbol(facilityUrl).apply {  height = 30F  width = 30F  }   // Create a graphic for each facility and add them to the graphics overlay  for (facility in facilitiesList) {  val facilityGraphic = Graphic(  geometry = facility.geometry,  symbol = facilitySymbol  )  facilityGraphicsOverlay.graphics.add(facilityGraphic)  }  }   /**  * Retrieve the tapped point [event], update the incident, and initiate the process  * to find the route between the incident and closest facility.  */  fun onSingleTapConfirmed(event: SingleTapConfirmedEvent) {   // Retrieve the tapped map point from the SingleTapConfirmedEvent  val mapPoint: Point = event.mapPoint ?: return messageDialogVM.showMessageDialog(  title = "No map point retrieved from tap."  )   // Create an incident on the tapped point  val incidentPoint = Incident(mapPoint)   // Clear and update the incident graphic on the map  updateIncidentGraphicPosition(incidentPoint)   // Find the closest facility to the incident  viewModelScope.launch {  findRoute(incidentPoint)  }  }   /**  * Updates the [incidentGraphicsOverlay] to display a graphic on the [incidentPoint]  */  private fun updateIncidentGraphicPosition(incidentPoint: Incident) {   incidentGraphicsOverlay.graphics.clear()   // Create a cross symbol for the incident  val incidentMarker = SimpleMarkerSymbol(  style = SimpleMarkerSymbolStyle.Cross,  color = Color.black,  size = 20.0F  )   // Get the incident's geometry  val incidentStopGeometry = incidentPoint.geometry   // Add graphic to incident graphic overlays  incidentGraphicsOverlay.graphics.add(  Graphic(  geometry = incidentStopGeometry,  symbol = incidentMarker  )  )   }   /**  * Find the route between the given [incidentPoint] and the closest available facility  *  */  private suspend fun findRoute(incidentPoint: Incident) {  val closestFacilityTask = ClosestFacilityTask(  url = application.getString(R.string.san_diego_network_service_url)  )   // Create a job to find the route  val closestFacilityParameters: ClosestFacilityParameters =  closestFacilityTask.createDefaultParameters().getOrThrow()  // Add the facilities and incident points  closestFacilityParameters.apply {  setFacilities(facilitiesList)  setIncidents(listOf(incidentPoint))  }   // Solve a route using the facility task with the created parameters.  val closestFacilityResult =  closestFacilityTask.solveClosestFacility(closestFacilityParameters).getOrElse { error ->  messageDialogVM.showMessageDialog(  title = "Error solving route: ${error.message.toString()}",  description = error.cause.toString()  )  } as ClosestFacilityResult  val rankedFacilitiesList = closestFacilityResult.getRankedFacilityIndexes(incidentIndex = 0)   // If the result contains a facility, solve the route from incident to facility.  if (rankedFacilitiesList.isNotEmpty()) {  val closestFacilityIndex = rankedFacilitiesList[0]  val route = closestFacilityResult.getRoute(  facilityIndex = closestFacilityIndex,  incidentIndex = 0  )  val routeSymbol = SimpleLineSymbol(  style = SimpleLineSymbolStyle.Solid,  color = Color.fromRgba(0, 0, 255),  width = 2.0f  )  val routeGraphic = Graphic(  geometry = route?.routeGeometry,  symbol = routeSymbol  )   // Add the route graphic to the incident graphic overlay  incidentGraphicsOverlay.graphics.add(routeGraphic)  }   } }