Add ENC exchange set

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 /* 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.addencexchangeset.components  import android.app.Application import androidx.compose.runtime.getValue import androidx.compose.runtime.mutableStateOf import androidx.compose.runtime.setValue import androidx.lifecycle.AndroidViewModel import androidx.lifecycle.viewModelScope import com.arcgismaps.geometry.Envelope import com.arcgismaps.geometry.GeometryEngine import com.arcgismaps.hydrography.EncCell import com.arcgismaps.hydrography.EncEnvironmentSettings import com.arcgismaps.hydrography.EncExchangeSet import com.arcgismaps.mapping.ArcGISMap import com.arcgismaps.mapping.BasemapStyle import com.arcgismaps.mapping.Viewpoint import com.arcgismaps.mapping.layers.EncLayer import com.esri.arcgismaps.sample.addencexchangeset.R import com.esri.arcgismaps.sample.sampleslib.components.MessageDialogViewModel import kotlinx.coroutines.launch import java.io.File  class MapViewModel(application: Application) : AndroidViewModel(application) {  private val provisionPath: String by lazy {  application.getExternalFilesDir(null)?.path.toString() +  File.separator +  application.getString(R.string.add_enc_exchange_set_app_name)  }   // Paths to ENC data and hydrology resources  private val encResourcesPath = provisionPath + application.getString(R.string.enc_res_dir)  private val encDataPath = provisionPath + application.getString(R.string.enc_data_dir)   // Create an ENC exchange set from the local ENC data  private val encExchangeSet = EncExchangeSet(listOf(encDataPath))  private val encEnvironmentSettings: EncEnvironmentSettings = EncEnvironmentSettings   // Create an empty map, to be updated once ENC data is loaded  var arcGISMap by mutableStateOf(ArcGISMap())   // Create a message dialog view model for handling error messages  val messageDialogVM = MessageDialogViewModel()   init {  // Provide ENC environment with location of ENC resources and configure SENC caching location  encEnvironmentSettings.resourcePath = encResourcesPath  encEnvironmentSettings.sencDataPath = application.externalCacheDir?.path   viewModelScope.launch {  encExchangeSet.load().onSuccess {   // Calculate the combined extent of all datasets in the exchange set  val exchangeSetExtent: Envelope? = encExchangeSet.extentOrNull()   // Set the map to the oceans basemap style, and viewpoint to the exchange set extent  arcGISMap = ArcGISMap(BasemapStyle.ArcGISOceans).apply {  exchangeSetExtent?.let {  initialViewpoint = Viewpoint(exchangeSetExtent)  }  }   encExchangeSet.datasets.forEach { encDataset ->  // Create a layer for each ENC dataset and add it to the map  val encCell = EncCell(encDataset)  val encLayer = EncLayer(encCell)  arcGISMap.operationalLayers.add(encLayer)   encLayer.load().onFailure { err ->  messageDialogVM.showMessageDialog(  "Error loading ENC layer",  err.message.toString()  )  }  }  }.onFailure { err ->  messageDialogVM.showMessageDialog(  "Error loading ENC exchange set",  err.message.toString()  )  }  }  } }  /**  * Get the combined extent of every dataset in the exchange set.  */ private fun EncExchangeSet.extentOrNull(): Envelope? {  var extent: Envelope? = null   datasets.forEach { dataset ->  if (extent == null) {  extent = dataset.extent  }   if (extent != null && dataset.extent != null) {  // Update the combined extent of the exchange set if geometry engine returns non-null  extent = GeometryEngine.combineExtentsOrNull(extent!!, dataset.extent!!) ?: extent  }  }  return extent }