Cut geometry

/* 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.cutgeometry

import android.os.Bundle
import androidx.activity.ComponentActivity
import androidx.activity.compose.setContent
import androidx.activity.enableEdgeToEdge
import androidx.compose.material3.MaterialTheme
import androidx.compose.material3.Surface
import androidx.compose.runtime.Composable
import com.arcgismaps.ApiKey
import com.arcgismaps.ArcGISEnvironment
import com.esri.arcgismaps.sample.sampleslib.theme.SampleAppTheme
import com.esri.arcgismaps.sample.cutgeometry.screens.CutGeometryScreen

class MainActivity : ComponentActivity() {

    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.ACCESS_TOKEN)

        enableEdgeToEdge()
        setContent {
            SampleAppTheme {
                CutGeometryApp()
            }
        }
    }

    @Composable
    private fun CutGeometryApp() {
        Surface(color = MaterialTheme.colorScheme.background) {
            CutGeometryScreen(
                sampleName = getString(R.string.cut_geometry_app_name)
            )
        }
    }
}

/* Copyright 2025 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.cutgeometry.components

import android.app.Application
import androidx.compose.runtime.getValue
import androidx.compose.runtime.mutableStateOf
import androidx.lifecycle.AndroidViewModel
import androidx.lifecycle.viewModelScope
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.Polyline
import com.arcgismaps.geometry.PolylineBuilder
import com.arcgismaps.geometry.SpatialReference
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.arcgismaps.toolkit.geoviewcompose.MapViewProxy
import com.esri.arcgismaps.sample.cutgeometry.R
import com.esri.arcgismaps.sample.sampleslib.components.MessageDialogViewModel
import kotlinx.coroutines.flow.MutableStateFlow
import kotlinx.coroutines.flow.asStateFlow
import kotlinx.coroutines.launch

class CutGeometryViewModel(application: Application) : AndroidViewModel(application) {

    // create a map with the topographic basemap style
    val arcGISMap by mutableStateOf(
        ArcGISMap(BasemapStyle.ArcGISTopographic).apply {
            initialViewpoint = Viewpoint(
                latitude = 39.8,
                longitude = -98.6,
                scale = 10e7
            )
        }
    )

    // create a MapViewProxy to interact with the MapView
    val mapViewProxy = MapViewProxy()

    // get a polygon corresponding to Lake Superior
    private val lakeSuperiorPolygon = makeLakeSuperior()

    // get a polyline that divides Lake Superior into a Canada side and US side
    private val borderPolyline = makeBorderPolyline()

    // create a graphic for the polygon representing Lake Superior
    private val polygonGraphic = Graphic(
        geometry = lakeSuperiorPolygon,
        symbol = SimpleFillSymbol(
            style = SimpleFillSymbolStyle.Solid,
            color = Color(R.color.transparentBlue),
            outline = SimpleLineSymbol(
                style = SimpleLineSymbolStyle.Solid,
                color = Color.blue,
                width = 2F
            )
        )
    )

    // create a graphic for the cut line
    private val polylineGraphic = Graphic(
        geometry = borderPolyline,
        symbol = SimpleLineSymbol(
            style = SimpleLineSymbolStyle.Dot,
            color = Color.red,
            width = 3F
        )
    )

    // create a state flow to handle the reset button
    private val _isResetButtonEnabled = MutableStateFlow(false)
    val isResetButtonEnabled = _isResetButtonEnabled.asStateFlow()

    // create a state flow to handle the cut button
    private val _isCutButtonEnabled = MutableStateFlow(false)
    val isCutButtonEnabled = _isCutButtonEnabled.asStateFlow()

    // create a graphic overlay
    val graphicsOverlay = GraphicsOverlay()

    // create a message dialog view model for handling error messages
    val messageDialogVM = MessageDialogViewModel()

    init {
        viewModelScope.launch {
            arcGISMap.load().onFailure { error ->
                messageDialogVM.showMessageDialog(
                    title = "Failed to load map",
                    description = error.message.toString()
                )
            }.onSuccess {
                graphicsOverlay.graphics.add(polygonGraphic)
                graphicsOverlay.graphics.add(polylineGraphic)
                polygonGraphic.geometry?.let { polygonToCut ->
                    mapViewProxy.setViewpoint(Viewpoint(polygonToCut))
                }
                _isCutButtonEnabled.value = true
            }
        }
    }

    /**
     * Clear the current graphics, then re-add the graphics for Lake Superior and the cut polyline.
     */
    fun resetGeometry() {
        graphicsOverlay.graphics.clear()
        graphicsOverlay.graphics.add(polygonGraphic)
        graphicsOverlay.graphics.add(polylineGraphic)
        polygonGraphic.geometry?.let { polygonToCut ->
            mapViewProxy.setViewpoint(Viewpoint(polygonToCut))
        }

        _isResetButtonEnabled.value = false
        _isCutButtonEnabled.value = true
    }

    /**
     * Cut the Lake Superior graphic into a US side and Canada side using the cut polyline
     * and then add the resulting graphics to the graphics overlay.
     */
    fun cutGeometry() {
        polygonGraphic.geometry?.let { graphicGeometry ->
            val parts = GeometryEngine.tryCut(
                geometry = graphicGeometry,
                cutter = polylineGraphic.geometry as Polyline
            )

            // create graphics for the US and Canada sides
            val canadaSide = Graphic(
                geometry = parts[0],
                symbol = SimpleFillSymbol(
                    style = SimpleFillSymbolStyle.BackwardDiagonal,
                    color = Color.green,
                    outline = SimpleLineSymbol(
                        style = SimpleLineSymbolStyle.Null,
                        color = Color.blue,
                        width = 0F
                    )
                )
            )
            val usSide = Graphic(
                geometry = parts[1],
                symbol = SimpleFillSymbol(
                    style = SimpleFillSymbolStyle.ForwardDiagonal,
                    color = Color.yellow,
                    outline = SimpleLineSymbol(
                        style = SimpleLineSymbolStyle.Null,
                        color = Color.blue,
                        width = 0F
                    )
                )
            )
            // add the graphics to the graphics overlay
            graphicsOverlay.graphics.addAll(listOf(canadaSide, usSide))

            // update button state
            _isCutButtonEnabled.value = false
            _isResetButtonEnabled.value = true
        }
    }

    /**
     * Define a blue color for polygon boundary.
     */
    private val Color.Companion.blue: Color
        get() {
            return fromRgba(
                r = 0,
                g = 0,
                b = 255,
                a = 255
            )
        }

    /**
     * Create a polygon corresponding to Lake Superior.
     */
    private fun makeLakeSuperior() : Polygon {
        return PolygonBuilder(SpatialReference.webMercator()) {
            addPoint(Point(x = -10254374.668616, y = 5908345.076380))
            addPoint(Point(x = -10178382.525314, y = 5971402.386779))
            addPoint(Point(x = -10118558.923141, y = 6034459.697178))
            addPoint(Point(x = -9993252.729399, y = 6093474.872295))
            addPoint(Point(x = -9882498.222673, y = 6209888.368416))
            addPoint(Point(x = -9821057.766387, y = 6274562.532928))
            addPoint(Point(x = -9690092.583250, y = 6241417.023616))
            addPoint(Point(x = -9605207.742329, y = 6206654.660191))
            addPoint(Point(x = -9564786.389509, y = 6108834.986367))
            addPoint(Point(x = -9449989.747500, y = 6095091.726408))
            addPoint(Point(x = -9462116.153346, y = 6044160.821855))
            addPoint(Point(x = -9417652.665244, y = 5985145.646738))
            addPoint(Point(x = -9438671.768711, y = 5946341.148031))
            addPoint(Point(x = -9398250.415891, y = 5922088.336339))
            addPoint(Point(x = -9419269.519357, y = 5855797.317714))
            addPoint(Point(x = -9467775.142741, y = 5858222.598884))
            addPoint(Point(x = -9462924.580403, y = 5902686.086985))
            addPoint(Point(x = -9598740.325877, y = 5884092.264688))
            addPoint(Point(x = -9643203.813979, y = 5845287.765981))
            addPoint(Point(x = -9739406.633691, y = 5879241.702350))
            addPoint(Point(x = -9783061.694736, y = 5922896.763395))
            addPoint(Point(x = -9844502.151022, y = 5936640.023354))
            addPoint(Point(x = -9773360.570059, y = 6019099.583107))
            addPoint(Point(x = -9883306.649729, y = 5968977.105610))
            addPoint(Point(x = -9957681.938918, y = 5912387.211662))
            addPoint(Point(x = -10055501.612742, y = 5871965.858842))
            addPoint(Point(x = -10116942.069028, y = 5884092.264688))
            addPoint(Point(x = -10111283.079633, y = 5933406.315128))
            addPoint(Point(x = -10214761.742852, y = 5888134.399970))
            addPoint(Point(x = -10254374.668616, y = 5901877.659929))
        }.toGeometry()
    }

    /**
     * Create a polyline corresponding to the US/Canada border over Lake Superior.
     */
    private fun makeBorderPolyline() : Polyline {
        return PolylineBuilder(SpatialReference.webMercator()) {
            addPoint(Point(x = -9981328.687124, y = 6111053.281447))
            addPoint(Point(x = -9946518.044066, y = 6102350.620682))
            addPoint(Point(x = -9872545.427566, y = 6152390.920079))
            addPoint(Point(x = -9838822.617103, y = 6157830.083057))
            addPoint(Point(x = -9446115.050097, y = 5927209.572793))
            addPoint(Point(x = -9430885.393759, y = 5876081.440801))
            addPoint(Point(x = -9415655.737420, y = 5860851.784463))
        }.toGeometry()
    }

}

/* Copyright 2025 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.cutgeometry.screens

import androidx.compose.foundation.layout.Arrangement
import androidx.compose.foundation.layout.Column
import androidx.compose.foundation.layout.Row
import androidx.compose.foundation.layout.fillMaxSize
import androidx.compose.foundation.layout.fillMaxWidth
import androidx.compose.foundation.layout.padding
import androidx.compose.material3.Button
import androidx.compose.material3.Scaffold
import androidx.compose.material3.Text
import androidx.compose.runtime.Composable
import androidx.compose.runtime.getValue
import androidx.compose.ui.Modifier
import androidx.compose.ui.res.stringResource
import androidx.compose.ui.unit.dp
import androidx.lifecycle.compose.collectAsStateWithLifecycle
import androidx.lifecycle.viewmodel.compose.viewModel
import com.arcgismaps.toolkit.geoviewcompose.MapView
import com.esri.arcgismaps.sample.cutgeometry.R
import com.esri.arcgismaps.sample.cutgeometry.components.CutGeometryViewModel
import com.esri.arcgismaps.sample.sampleslib.components.MessageDialog
import com.esri.arcgismaps.sample.sampleslib.components.SampleTopAppBar

/**
 * Main screen layout for the sample app.
 */
@Composable
fun CutGeometryScreen(sampleName: String) {
    val mapViewModel: CutGeometryViewModel = viewModel()
    val isResetButtonEnabled by mapViewModel.isResetButtonEnabled.collectAsStateWithLifecycle()
    val isCutButtonEnabled by mapViewModel.isCutButtonEnabled.collectAsStateWithLifecycle()
    Scaffold(
        topBar = { SampleTopAppBar(title = sampleName) },
        content = {
            Column(
                modifier = Modifier
                    .fillMaxSize()
                    .padding(it),
            ) {
                MapView(
                    modifier = Modifier
                        .fillMaxSize()
                        .weight(1f),
                    arcGISMap = mapViewModel.arcGISMap,
                    graphicsOverlays = listOf(mapViewModel.graphicsOverlay),
                    mapViewProxy = mapViewModel.mapViewProxy
                )
                Row(
                    modifier = Modifier.fillMaxWidth(),
                    horizontalArrangement = Arrangement.Center
                ) {
                    Button(
                        modifier = Modifier.padding(12.dp),
                        enabled = isResetButtonEnabled,
                        onClick = {
                            mapViewModel.resetGeometry()
                        }
                    ) {
                        Text(
                            text = stringResource(R.string.reset_button_text)
                        )
                    }
                    Button(
                        modifier = Modifier.padding(12.dp),
                        enabled = isCutButtonEnabled,
                        onClick = {
                            mapViewModel.cutGeometry()
                        }
                    ) {
                        Text(
                            text = stringResource(R.string.cut_geometry_button_text)
                        )
                    }
                }

                mapViewModel.messageDialogVM.apply {
                    if (dialogStatus) {
                        MessageDialog(
                            title = messageTitle,
                            description = messageDescription,
                            onDismissRequest = ::dismissDialog
                        )
                    }
                }
            }
        }
    )
}