Cut geometry
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
Click "Cut" 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::cut
to cut the geometry along the polyline. - Create a new
Graphic
for each in the list of cut geometries and add them to theGraphicsOverlay
on theMapView
.
Relevant API
- GeometryEngine::cut
- Polygon
- Polyline
Tags
cut, geometry, split
Sample Code
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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"
#include "MapTypes.h"
#include "GraphicsOverlayListModel.h"
#include "TaskWatcher.h"
#include "SymbolTypes.h"
#include "GraphicListModel.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(),
geometry_cast<Polyline>(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);
}
void CutGeometry::resetPolygon()
{
m_overlay->graphics()->clear();
m_overlay->graphics()->append(m_lakeSuperiorGraphic);
m_overlay->graphics()->append(m_borderGraphic);
}
// 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->toPolygon();
}
// 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->toPolyline();
}