Raster function service

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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.
 *
 */

package com.esri.arcgisruntime.sample.rasterfunctionservice

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment
import com.esri.arcgisruntime.layers.RasterLayer
import com.esri.arcgisruntime.loadable.LoadStatus
import com.esri.arcgisruntime.mapping.ArcGISMap
import com.esri.arcgisruntime.mapping.BasemapStyle
import com.esri.arcgisruntime.mapping.view.MapView
import com.esri.arcgisruntime.raster.ImageServiceRaster
import com.esri.arcgisruntime.raster.Raster
import com.esri.arcgisruntime.raster.RasterFunction
import com.esri.arcgisruntime.sample.rasterfunctionservice.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {

    private val activityMainBinding by lazy {
        ActivityMainBinding.inflate(layoutInflater)
    }

    private val mapView: MapView by lazy {
        activityMainBinding.mapView
    }

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

        // authentication with an API key or named user is required to access basemaps and other
        // location services
        ArcGISRuntimeEnvironment.setApiKey(BuildConfig.API_KEY)

        // create a Dark Gray Vector BaseMap
        val map = ArcGISMap(BasemapStyle.ARCGIS_DARK_GRAY)
        // set the map to be displayed in this view
        mapView.map = map
        // create image service raster as raster layer
        val imageServiceRaster = ImageServiceRaster(
            resources.getString(R.string.image_service_raster_url)
        )
        val imageRasterLayer = RasterLayer(imageServiceRaster)
        map.operationalLayers.add(imageRasterLayer)
        // zoom to the extent of the raster service
        imageRasterLayer.addDoneLoadingListener {
            if (imageRasterLayer.loadStatus == LoadStatus.LOADED) {
                // zoom to extent of raster
                val centerPnt = imageServiceRaster.serviceInfo.fullExtent.center
                mapView.setViewpointCenterAsync(centerPnt, 55000000.0)
                // update raster with simplified hillshade
                applyRasterFunction(imageServiceRaster)
            }
        }
    }

    /**
     * Apply a raster function on the given Raster
     *
     * @param raster Input raster to apply function
     */
    private fun applyRasterFunction(raster: Raster) {
        // create raster function from json string
        val rasterFunction =
            RasterFunction.fromJson(resources.getString(R.string.hillshade_simplified))
        // get parameter name value pairs used by hillshade
        val rasterFunctionArguments = rasterFunction.arguments
        // get list of raster names associated with raster function
        val rasterName = rasterFunctionArguments.rasterNames
        // set raster to the raster name
        rasterFunctionArguments.setRaster(rasterName[0], raster)
        // create raster as raster layer
        val raster = Raster(rasterFunction)
        val hillshadeLayer = RasterLayer(raster)
        // add hillshade raster
        mapView.map.operationalLayers.add(hillshadeLayer)
    }

    override fun onPause() {
        super.onPause()
        mapView.pause()
    }

    override fun onResume() {
        super.onResume()
        mapView.resume()
    }

    override fun onDestroy() {
        super.onDestroy()
        mapView.dispose()
    }
}