Find nearest vertex

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/* Copyright 2022 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.findnearestvertex

import android.os.Bundle
import android.util.Log
import android.view.View
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import androidx.constraintlayout.widget.ConstraintLayout
import androidx.databinding.DataBindingUtil
import androidx.lifecycle.lifecycleScope
import com.arcgismaps.ApiKey
import com.arcgismaps.ArcGISEnvironment
import com.arcgismaps.Color
import com.arcgismaps.geometry.GeometryEngine
import com.arcgismaps.geometry.Point
import com.arcgismaps.geometry.Polygon
import com.arcgismaps.geometry.PolygonBuilder
import com.arcgismaps.geometry.SpatialReference
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.layers.FeatureLayer
import com.arcgismaps.mapping.symbology.SimpleFillSymbol
import com.arcgismaps.mapping.symbology.SimpleFillSymbolStyle
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.portal.Portal
import com.arcgismaps.mapping.PortalItem
import com.esri.arcgismaps.sample.findnearestvertex.databinding.ActivityMainBinding
import com.google.android.material.snackbar.Snackbar
import kotlinx.coroutines.launch

class MainActivity : AppCompatActivity() {

    // set up data binding for the activity
    private val activityMainBinding: ActivityMainBinding by lazy {
        DataBindingUtil.setContentView(this, R.layout.activity_main)
    }

    private val mapView by lazy {
        activityMainBinding.mapView
    }

    private val distanceLayout: ConstraintLayout by lazy {
        activityMainBinding.distanceLayout
    }

    private val vertexDistanceTextView: TextView by lazy {
        activityMainBinding.vertexDistanceTextView
    }

    private val coordinateDistanceTextView: TextView by lazy {
        activityMainBinding.coordinateDistanceTextView
    }

    // California zone 5 (ftUS) state plane coordinate system.
    private val statePlaneCaliforniaZone5SpatialReference = SpatialReference(2229)

    // create graphics with symbols for tapped location, nearest coordinate, and nearest vertex
    private val tappedLocationGraphic =
        Graphic(symbol = SimpleMarkerSymbol(SimpleMarkerSymbolStyle.X, Color.magenta, 15f))

    // create graphic symbol of the nearest coordinate
    private val nearestCoordinateGraphic =
        Graphic(symbol = SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Diamond, Color.red, 10f))

    // create graphic symbol of the nearest vertex
    private val nearestVertexGraphic =
        Graphic(symbol = SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Circle, Color.blue, 15f))

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)

        // authentication with an API key or named user is
        // required to access basemaps and other location services
        ArcGISEnvironment.apiKey = ApiKey.create(BuildConfig.API_KEY)
        lifecycle.addObserver(mapView)

        // create a polygon geometry
        val polygon = PolygonBuilder(statePlaneCaliforniaZone5SpatialReference) {
            addPoint(Point(6627416.41469281, 1804532.53233782))
            addPoint(Point(6669147.89779046, 2479145.16609522))
            addPoint(Point(7265673.02678292, 2484254.50442408))
            addPoint(Point(7676192.55880379, 2001458.66365744))
        }.toGeometry()
        // set up the outline and fill color of the polygon
        val polygonOutlineSymbol = SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.green, 2f)
        val polygonFillSymbol = SimpleFillSymbol(
            SimpleFillSymbolStyle.ForwardDiagonal,
            Color.green,
            polygonOutlineSymbol
        )
        // create a polygon graphic
        val polygonGraphic = Graphic(polygon, polygonFillSymbol)
        // create a graphics overlay to show the polygon, tapped location, and nearest vertex/coordinate
        val graphicsOverlay = GraphicsOverlay(
            listOf(
                polygonGraphic,
                tappedLocationGraphic,
                nearestCoordinateGraphic,
                nearestVertexGraphic
            )
        )

        // create a map using the portal item
        val map = ArcGISMap(statePlaneCaliforniaZone5SpatialReference)
        val portal = Portal("https://arcgisruntime.maps.arcgis.com")
        val portalItem = PortalItem(portal, "99fd67933e754a1181cc755146be21ca")
        val usStatesGeneralizedLayer = FeatureLayer.createWithItemAndLayerId(portalItem, 0)
        // and add the feature layer to the map's operational layers
        map.operationalLayers.add(usStatesGeneralizedLayer)
        // add the map to the map view
        mapView.map = map
        // add the graphics overlay to the map view
        mapView.graphicsOverlays.add(graphicsOverlay)
        lifecycleScope.launch {
            // check if map has loaded
            map.load().onSuccess {
                // zoom to the polygon's extent
                mapView.setViewpointGeometry(polygon.extent, 100.0)
                // get point on map tapped
                mapView.onSingleTapConfirmed.collect { event ->
                    // find nearest vertex on map tapped
                    event.mapPoint?.let { findNearestVertex(it, polygon) }
                }
            }.onFailure {
                showError("Error loading map")
            }
        }
    }

    /**
     * Finds the nearest vertex from [mapPoint] from the [polygon]
     */
    private fun findNearestVertex(mapPoint: Point, polygon: Polygon) {
        // show where the user clicked
        tappedLocationGraphic.geometry = mapPoint
        // use the geometry engine to get the nearest vertex
        val nearestVertexResult =
            GeometryEngine.nearestVertex(polygon, mapPoint)
        // set the nearest vertex graphic's geometry to the nearest vertex
        nearestVertexGraphic.geometry = nearestVertexResult?.coordinate
        // use the geometry engine to get the nearest coordinate
        val nearestCoordinateResult =
            GeometryEngine.nearestCoordinate(polygon, mapPoint)
        // set the nearest coordinate graphic's geometry to the nearest coordinate
        nearestCoordinateGraphic.geometry = nearestCoordinateResult?.coordinate
        // show the distances to the nearest vertex and nearest coordinate
        distanceLayout.visibility = View.VISIBLE
        // convert distance to miles
        val vertexDistance = ((nearestVertexResult?.distance)?.div(5280.0))?.toInt()
        val coordinateDistance = ((nearestCoordinateResult?.distance)?.div(5280.0))?.toInt()
        // set the distance to the text views
        vertexDistanceTextView.text = getString(R.string.nearest_vertex, vertexDistance)
        coordinateDistanceTextView.text =
            getString(R.string.nearest_coordinate, coordinateDistance)

    }

    private val Color.Companion.blue: Color
        get() {
            return fromRgba(0, 0, 255, 255)
        }

    private val Color.Companion.magenta: Color
        get() {
            return fromRgba(255, 0, 255, 255)
        }

    private fun showError(message: String) {
        Log.e(localClassName, message)
        Snackbar.make(mapView, message, Snackbar.LENGTH_SHORT).show()
    }
}