Cut geometry

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Sample viewer app

Cut a geometry along a polyline.

screenshot

Use case

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

How to use the sample

Click "Cut" 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. Create a new Graphic for each in the list of cut geometries and add them to the GraphicsOverlay on the MapView.

Relevant API

  • GeometryEngine::cut
  • Polygon
  • Polyline

Tags

cut, geometry, split

Sample Code

CutGeometry.cppCutGeometry.cppCutGeometry.hCutGeometry.qml
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// [WriteFile Name=CutGeometry, Category=Geometry]
// [Legal]
// Copyright 2018 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.
// [Legal]

#ifdef PCH_BUILD
#include "pch.hpp"
#endif // PCH_BUILD

#include "CutGeometry.h"

#include "Map.h"
#include "MapQuickView.h"
#include "Graphic.h"
#include "GraphicsOverlay.h"
#include "GeometryEngine.h"
#include "SpatialReference.h"
#include "PolylineBuilder.h"
#include "PolygonBuilder.h"
#include "SimpleLineSymbol.h"
#include "SimpleFillSymbol.h"

using namespace Esri::ArcGISRuntime;

CutGeometry::CutGeometry(QQuickItem* parent /* = nullptr */):
  QQuickItem(parent)
{
}

void CutGeometry::init()
{
  // Register the map view for QML
  qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView");
  qmlRegisterType<CutGeometry>("Esri.Samples", 1, 0, "CutGeometrySample");
}

void CutGeometry::componentComplete()
{
  QQuickItem::componentComplete();

  // find QML MapView component
  m_mapView = findChild<MapQuickView*>("mapView");

  // Create a map using the topographic basemap
  m_map = new Map(BasemapStyle::ArcGISTopographic, this);

  // Set map to map view
  m_mapView->setMap(m_map);

  // Add a GraphicsOverlay
  m_overlay = new GraphicsOverlay(this);
  m_mapView->graphicsOverlays()->append(m_overlay);

  // Create initial graphics
  createGraphics();

  // Set Viewpoint
  m_mapView->setViewpointGeometry(m_lakeSuperiorGraphic->geometry());
}

// Cuts the Lake Superior polygon into two and symbolizes each output graphic
void CutGeometry::cutPolygon()
{
  // perform the cut
  QList<Geometry> geoms = GeometryEngine::cut(m_lakeSuperiorGraphic->geometry(), m_borderGraphic->geometry());

  // create graphics for the U.S. side
  SimpleLineSymbol* outline = new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, QColor("blue"), 1.0f, this);
  SimpleFillSymbol* usSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle::ForwardDiagonal, QColor("#40ff00"), outline, this);
  Graphic* usSide = new Graphic(geoms.at(0), usSymbol, this);

  // create graphics for the Canada side
  SimpleFillSymbol* canadaSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle::ForwardDiagonal, QColor("#ffff00"), outline, this);
  Graphic* canadaSide = new Graphic(geoms.at(1), canadaSymbol, this);

  // add graphics
  m_overlay->graphics()->append(canadaSide);
  m_overlay->graphics()->append(usSide);
}

// Create the two baseline graphics
void CutGeometry::createGraphics()
{
  // Lake Superior Graphic
  SimpleLineSymbol* outline = new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, QColor("blue"), 1.0f, this);
  SimpleFillSymbol* usSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle::Solid, QColor(198, 204, 255, 178), outline, this);
  m_lakeSuperiorGraphic = new Graphic(createLakeSuperiorPolygon(), usSymbol, this);
  m_overlay->graphics()->append(m_lakeSuperiorGraphic);

  // Border Graphic
  SimpleLineSymbol* borderSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle::Dot, QColor("red"), 5.0f, this);
  m_borderGraphic = new Graphic(createBorderPolyline(), borderSymbol, this);
  m_borderGraphic->setZIndex(10);
  m_overlay->graphics()->append(m_borderGraphic);
}

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

// Create the U.S./Canada Border Polyline
Polyline CutGeometry::createBorderPolyline()
{
  PolylineBuilder* polylineBuilder = new PolylineBuilder(SpatialReference::webMercator(), this);
  polylineBuilder->addPoint(-9981328.687124, 6111053.281447);
  polylineBuilder->addPoint(-9946518.044066, 6102350.620682);
  polylineBuilder->addPoint(-9872545.427566, 6152390.920079);
  polylineBuilder->addPoint(-9838822.617103, 6157830.083057);
  polylineBuilder->addPoint(-9446115.050097, 5927209.572793);
  polylineBuilder->addPoint(-9430885.393759, 5876081.440801);
  polylineBuilder->addPoint(-9415655.737420, 5860851.784463);
  return polylineBuilder->toGeometry();
}

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