Create planar and geodetic buffers

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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.createplanarandgeodeticbuffers

import android.os.Bundle
import android.widget.Toast
import androidx.appcompat.app.AppCompatActivity
import androidx.databinding.DataBindingUtil
import androidx.lifecycle.lifecycleScope
import com.arcgismaps.ApiKey
import com.arcgismaps.geometry.GeodeticCurveType
import com.arcgismaps.geometry.GeometryEngine
import com.arcgismaps.geometry.LinearUnit
import com.arcgismaps.geometry.LinearUnitId
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
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.symbology.SimpleRenderer
import com.arcgismaps.mapping.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.arcgismaps.ArcGISEnvironment
import com.arcgismaps.Color
import com.esri.arcgismaps.sample.createplanarandgeodeticbuffers.databinding.ActivityMainBinding
import kotlinx.coroutines.launch

class MainActivity : AppCompatActivity() {

    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)

        // set up data binding for the activity
        val activityMainBinding: ActivityMainBinding =
            DataBindingUtil.setContentView(this, R.layout.activity_main)
        // get the views from the layout
        val mapView = activityMainBinding.mapView
        val bufferInput = activityMainBinding.bufferInput
        val clearButton = activityMainBinding.clearButton
        // add mapview to the lifecycle
        lifecycle.addObserver(mapView)

        // create a map with a topographic basemap
        mapView.map = ArcGISMap(BasemapStyle.ArcGISTopographic)

        // create a fill symbol for geodesic buffer polygons
        val geodesicOutlineSymbol = SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.black, 2F)
        val geodesicBufferFillSymbol = SimpleFillSymbol(
            SimpleFillSymbolStyle.Solid, Color.green,
            geodesicOutlineSymbol
        )

        // create a graphics overlay to display geodesic polygons and set its renderer
        val geodesicGraphicsOverlay = GraphicsOverlay().apply {
            renderer = SimpleRenderer(geodesicBufferFillSymbol)
            opacity = 0.5f
        }

        // create a fill symbol for planar buffer polygons
        val planarOutlineSymbol = SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.black, 2F)
        val planarBufferFillSymbol = SimpleFillSymbol(
            SimpleFillSymbolStyle.Solid, Color.red,
            planarOutlineSymbol
        )

        // create a graphics overlay to display planar polygons and set its renderer
        val planarGraphicsOverlay = GraphicsOverlay().apply {
            renderer = SimpleRenderer(planarBufferFillSymbol)
            opacity = 0.5f
        }

        // create a marker symbol for tap locations
        val tapSymbol = SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Cross, Color.white, 14F)

        // create a graphics overlay to display tap locations for buffers and set its renderer
        val tapLocationsOverlay = GraphicsOverlay().apply {
            renderer = SimpleRenderer(tapSymbol)
        }

        // add overlays to the mapView
        mapView.graphicsOverlays.addAll(
            listOf(
                geodesicGraphicsOverlay,
                planarGraphicsOverlay,
                tapLocationsOverlay
            )
        )

        // create a buffer around the clicked location
        lifecycleScope.launch {
            mapView.onSingleTapConfirmed.collect { event ->
                // get map point tapped, return if null
                val mapPoint = event.mapPoint ?: return@collect

                // only draw a buffer if a value was entered
                if (bufferInput.text.toString().isNotEmpty()) {
                    // get the buffer distance (miles) entered in the text box
                    val bufferInMiles = bufferInput.text.toString().toDouble()

                    // convert the input distance to meters, 1609.34 meters in one mile
                    val bufferInMeters = bufferInMiles * 1609.34

                    // create a planar buffer graphic around the input location at the specified distance
                    val bufferGeometryPlanar = GeometryEngine.buffer(mapPoint, bufferInMeters)
                    val planarBufferGraphic = Graphic(bufferGeometryPlanar)

                    // create a geodesic buffer graphic using the same location and distance
                    val bufferGeometryGeodesic =
                        GeometryEngine.bufferGeodetic(
                            mapPoint, bufferInMeters,
                            LinearUnit(LinearUnitId.Meters), Double.NaN, GeodeticCurveType.Geodesic
                        )
                    val geodesicBufferGraphic = Graphic(bufferGeometryGeodesic)

                    // create a graphic for the user tap location
                    val locationGraphic = Graphic(mapPoint)

                    // add the buffer polygons and tap location graphics to the appropriate graphic overlays
                    planarGraphicsOverlay.graphics.add(planarBufferGraphic)
                    geodesicGraphicsOverlay.graphics.add(geodesicBufferGraphic)
                    tapLocationsOverlay.graphics.add(locationGraphic)
                } else {
                    Toast.makeText(
                        this@MainActivity,
                        "Please enter a buffer distance first.",
                        Toast.LENGTH_LONG
                    ).show()
                }
            }
        }
        // clear the graphics from the graphics overlays
        clearButton.setOnClickListener {
            planarGraphicsOverlay.graphics.clear()
            geodesicGraphicsOverlay.graphics.clear()
            tapLocationsOverlay.graphics.clear()
        }
    }
}