Cut a geometry along a polyline.
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
- Pass the geometry and polyline to
GeometryEngine.cutto cut the geometry along the polyline. - 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
/* 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.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)
}
}