Cut geometry

View on GitHubSample viewer app

Cut a geometry along a polyline.

Image of cut geometry

Use case

You might cut a polygon representing a large parcel to subdivide it into smaller parcels.

How to use the sample

Tap the "Cut" button to cut the polygon with the polyline and see the resulting parts (shaded in different colors).

How it works

  1. Pass the geometry and polyline to GeometryEngine.cut to cut the geometry along the polyline.
  2. Loop through the returned list of part geometries. Some of these geometries may be multi-part.

Relevant API

  • GeometryEngine
  • Polygon
  • Polyline

Tags

cut, geometry, split

Sample Code

MainActivity.kt
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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.cutgeometry

import android.os.Bundle
import android.view.View
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.GeometryEngine
import com.arcgismaps.geometry.Point
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.mapping.view.MapView
import com.esri.arcgismaps.sample.cutgeometry.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {

    private val lakeSuperiorPolygon by lazy {
        PolygonBuilder(SpatialReference.webMercator()) {
            addPoint(Point(-10254374.668616, 5908345.076380))
            addPoint(Point(-10178382.525314, 5971402.386779))
            addPoint(Point(-10118558.923141, 6034459.697178))
            addPoint(Point(-9993252.729399, 6093474.872295))
            addPoint(Point(-9882498.222673, 6209888.368416))
            addPoint(Point(-9821057.766387, 6274562.532928))
            addPoint(Point(-9690092.583250, 6241417.023616))
            addPoint(Point(-9605207.742329, 6206654.660191))
            addPoint(Point(-9564786.389509, 6108834.986367))
            addPoint(Point(-9449989.747500, 6095091.726408))
            addPoint(Point(-9462116.153346, 6044160.821855))
            addPoint(Point(-9417652.665244, 5985145.646738))
            addPoint(Point(-9438671.768711, 5946341.148031))
            addPoint(Point(-9398250.415891, 5922088.336339))
            addPoint(Point(-9419269.519357, 5855797.317714))
            addPoint(Point(-9467775.142741, 5858222.598884))
            addPoint(Point(-9462924.580403, 5902686.086985))
            addPoint(Point(-9598740.325877, 5884092.264688))
            addPoint(Point(-9643203.813979, 5845287.765981))
            addPoint(Point(-9739406.633691, 5879241.702350))
            addPoint(Point(-9783061.694736, 5922896.763395))
            addPoint(Point(-9844502.151022, 5936640.023354))
            addPoint(Point(-9773360.570059, 6019099.583107))
            addPoint(Point(-9883306.649729, 5968977.105610))
            addPoint(Point(-9957681.938918, 5912387.211662))
            addPoint(Point(-10055501.612742, 5871965.858842))
            addPoint(Point(-10116942.069028, 5884092.264688))
            addPoint(Point(-10111283.079633, 5933406.315128))
            addPoint(Point(-10214761.742852, 5888134.399970))
            addPoint(Point(-10254374.668616, 5901877.659929))
        }.toGeometry()
    }

    private val borderPolyline by lazy {
        PolylineBuilder(SpatialReference.webMercator()) {
            addPoint(Point(-9981328.687124, 6111053.281447))
            addPoint(Point(-9946518.044066, 6102350.620682))
            addPoint(Point(-9872545.427566, 6152390.920079))
            addPoint(Point(-9838822.617103, 6157830.083057))
            addPoint(Point(-9446115.050097, 5927209.572793))
            addPoint(Point(-9430885.393759, 5876081.440801))
            addPoint(Point(-9415655.737420, 5860851.784463))
        }.toGeometry()
    }

    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)
        val mapView = activityMainBinding.mapView
        lifecycle.addObserver(mapView)
        val cutButton = activityMainBinding.cutButton
        val resetButton = activityMainBinding.resetButton

        // set the map to be displayed in this view
        mapView.map = ArcGISMap(BasemapStyle.ArcGISTopographic)

        // create a graphic overlay
        val graphicsOverlay = GraphicsOverlay()
        mapView.graphicsOverlays.add(graphicsOverlay)

        val (polygonGraphic, polylineGraphic) = createGraphics(graphicsOverlay, mapView)

        cutButton.setOnClickListener {
            // cut the graphic along the polyline to create 2 graphic parts
            polygonGraphic.geometry?.let { graphicGeometry ->
                val parts = GeometryEngine.tryCut(
                    graphicGeometry,
                    polylineGraphic.geometry as Polyline
                )

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

                // swap button state
                cutButton.isEnabled = false
                resetButton.isEnabled = true
            }
        }

        resetButton.setOnClickListener {
            // clear existing graphics
            graphicsOverlay.graphics.clear()

            // recreate original graphics
            createGraphics(graphicsOverlay, mapView)

            // swap button state
            cutButton.isEnabled = true
            resetButton.isEnabled = false
        }

    }

    /**
     * Create polygon and polyline graphics.
     *
     * @return polygon and polyline graphics
     */
    private fun createGraphics(
        graphicsOverlay: GraphicsOverlay,
        mapView: MapView
    ): Pair<Graphic, Graphic> {
        // create a blue polygon graphic to cut
        val polygonGraphic = Graphic(
            lakeSuperiorPolygon,
            SimpleFillSymbol(
                SimpleFillSymbolStyle.Solid, Color(R.color.transparentBlue),
                SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.blue, 2F)
            )
        )
        graphicsOverlay.graphics.add(polygonGraphic)

        // create a red polyline graphic to cut the polygon
        val polylineGraphic = Graphic(
            borderPolyline, SimpleLineSymbol(
                SimpleLineSymbolStyle.Dot,
                Color.red, 3F
            )
        )
        graphicsOverlay.graphics.add(polylineGraphic)
        // zoom to show the polygon graphic
        polygonGraphic.geometry?.let { graphicGeometry ->
            mapView.setViewpoint(Viewpoint(graphicGeometry))
        }
        return Pair(polygonGraphic, polylineGraphic)
    }

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

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

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