Clip geometry

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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.clipgeometry

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import androidx.databinding.DataBindingUtil
import com.arcgismaps.ApiKey
import com.arcgismaps.ArcGISEnvironment
import com.arcgismaps.Color
import com.arcgismaps.geometry.Envelope
import com.arcgismaps.geometry.GeometryEngine
import com.arcgismaps.geometry.Point
import com.arcgismaps.mapping.ArcGISMap
import com.arcgismaps.mapping.BasemapStyle
import com.arcgismaps.mapping.Viewpoint
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.view.Graphic
import com.arcgismaps.mapping.view.GraphicsOverlay
import com.esri.arcgismaps.sample.clipgeometry.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {

    // graphics overlay along the Colorado state border
    private val coloradoOverlay: GraphicsOverlay by lazy { GraphicsOverlay() }

    // graphics overlay to contain the clipping envelopes
    private val envelopesOverlay: GraphicsOverlay by lazy { GraphicsOverlay() }

    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 MapView instance from the data binding
        val mapView = activityMainBinding.mapView
        lifecycle.addObserver(mapView)

        // create buttons to perform the clip and reset operations on the geometry
        val clipButton = activityMainBinding.clipButton
        val resetButton = activityMainBinding.resetButton

        // create and add a map with a topographic basemap style
        mapView.map = ArcGISMap(BasemapStyle.ArcGISTopographic)
        // set the viewpoint of the MapView
        mapView.setViewpoint(Viewpoint(40.0, -106.0, 10000000.0))

        // create a graphics overlay to contain the geometry to clip
        mapView.graphicsOverlays.add(coloradoOverlay)
        val (coloradoGraphic, fillSymbol) = createGraphics(coloradoOverlay)

        // create a graphics overlay to contain the clipping envelopes
        mapView.graphicsOverlays.add(envelopesOverlay)
        createEnvelope(envelopesOverlay)

        // create a graphics overlay to contain the clipped areas
        val clipAreasOverlay = GraphicsOverlay()
        mapView.graphicsOverlays.add(clipAreasOverlay)

        clipButton.setOnClickListener {
            // disable button
            clipButton.isEnabled = false
            resetButton.isEnabled = true
            // for each envelope, clip the Colorado geometry and show the result,
            // replacing the original Colorado graphic
            coloradoGraphic.isVisible = false
            for (graphic in envelopesOverlay.graphics) {
                val geometry =
                    coloradoGraphic.geometry?.let { coloradoGeometry ->
                        GeometryEngine.clipOrNull(coloradoGeometry, graphic.geometry as Envelope)
                    }
                val clippedGraphic = Graphic(geometry, fillSymbol)
                clipAreasOverlay.graphics.add(clippedGraphic)
            }
        }

        resetButton.setOnClickListener {
            // clear clipped graphic
            clipAreasOverlay.graphics.clear()

            // set the visibility of the colorado graphic to true
            coloradoGraphic.isVisible = true

            clipButton.isEnabled = true
            resetButton.isEnabled = false
        }
    }

    /**
     * Create colorado graphic.
     */
    private fun createGraphics(
        coloradoOverlay: GraphicsOverlay,
    ) : Pair<Graphic, SimpleFillSymbol>{
        // create a blue graphic of Colorado
        val colorado = Envelope(
            Point(-11362327.128340, 5012861.290274),
            Point(-12138232.018408, 4441198.773776)
        )
        val fillSymbol = SimpleFillSymbol(
            SimpleFillSymbolStyle.Solid,
            Color(R.color.transparentDarkBlue),
            SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.green, 2f)
        )
        val coloradoGraphic = Graphic(colorado, fillSymbol)
        coloradoOverlay.graphics.add(coloradoGraphic)
        return Pair(coloradoGraphic, fillSymbol)
    }

    /**
     * Create three envelopes, outside, inside and intersecting colorado graphic.
     */
    private fun createEnvelope(
        envelopesOverlay: GraphicsOverlay,
    ) {
        // create a dotted red outline symbol
        val redOutline = SimpleLineSymbol(SimpleLineSymbolStyle.Dot, Color.red, 3f)

        // create a envelope outside Colorado
        val outsideEnvelope = Envelope(
            Point(-11858344.321294, 5147942.225174),
            Point(-12201990.219681, 5297071.577304)
        )
        val outside = Graphic(outsideEnvelope, redOutline)
        envelopesOverlay.graphics.add(outside)

        // create a envelope intersecting Colorado
        val intersectingEnvelope = Envelope(
            Point(-11962086.479298, 4566553.881363),
            Point(-12260345.183558, 4332053.378376)
        )
        val intersecting = Graphic(intersectingEnvelope, redOutline)
        envelopesOverlay.graphics.add(intersecting)

        // create a envelope inside Colorado
        val containedEnvelope = Envelope(
            Point(-11655182.595204, 4741618.772994),
            Point(-11431488.567009, 4593570.068343)
        )
        val contained = Graphic(containedEnvelope, redOutline)
        envelopesOverlay.graphics.add(contained)
    }
}