Create geometries

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Create simple geometry types.

screenshot

Use case

Geometries are used to represent real world features as vector GIS data. Points are used to mark specific XY locations, such as landmarks and other points of interest. Polylines are made up of 2 or more XY vertices and can be used to mark roads, flight paths, or boundaries. Polygons are made up of 3 or more XY vertices and can be used to represent a lake, country, or a park. Geometries can be stored as features in a database, displayed as Graphics in a map, or used for performing spatial analysis with GeometryEngine or a GeoprocessingTask.

How to use the sample

Pan and zoom freely to see the different types of geometries placed onto the map.

How it works

  1. Use the constructors for the various simple Geometry types including Point, Polyline, Multipoint, Polygon, and Envelope.
  2. To display the geometry, create a Graphic passing in the geometry, and a Symbol appropriate for the geometry type.
  3. Add the graphic to a graphics overlay and add the overlay to a map view.

Relevant API

  • Envelope
  • Multipoint
  • Point
  • PointCollection
  • Polygon
  • Polyline

Additional information

A geometry made of multiple points usually takes a PointCollection as an argument or is created through a builder.

Tags

area, boundary, line, marker, path, shape

Sample Code

CreateGeometries.cppCreateGeometries.cppCreateGeometries.hCreateGeometries.qml
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// [WriteFile Name=CreateGeometries, 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 "CreateGeometries.h"

#include "Map.h"
#include "MapQuickView.h"
#include "Graphic.h"
#include "GraphicsOverlay.h"
#include "Geometry.h"
#include "Multipoint.h"
#include "Point.h"
#include "Polygon.h"
#include "Polyline.h"
#include "PolygonBuilder.h"
#include "PolylineBuilder.h"
#include "MultipointBuilder.h"
#include "SimpleFillSymbol.h"
#include "SimpleLineSymbol.h"
#include "SimpleMarkerSymbol.h"

using namespace Esri::ArcGISRuntime;

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

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

void CreateGeometries::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);

  // Add a Graphics Overlay to the map view
  m_graphicsOverlay = new GraphicsOverlay(this);
  m_mapView->graphicsOverlays()->append(m_graphicsOverlay);

  // Add graphics to the overlay once the map loads
  connect(m_map, &Map::doneLoading, this, [this](Error e)
  {
    if (!e.isEmpty())
      return;

    addGraphics();
  });

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

// function to add Graphics to a Graphics Overlay
void CreateGeometries::addGraphics()
{
  // Create a simple fill symbol - used to render a polygon covering Colorado.
  SimpleFillSymbol* simpleFillSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle::Cross, QColor("blue"), this);

  // Create a simple line symbol - used to render a polyline border between California and Nevada.
  SimpleLineSymbol* simpleLineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, QColor("blue"), 3.0f /*width*/, this);

  // Create a simple marker symbol - used to render multi-points for various state capital locations in the Western United States.
  SimpleMarkerSymbol* simpleMarkerSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::Triangle, QColor("blue"), 14.0f /*size*/, this);

  // Create a simple marker symbol - used to render a map point where the Esri headquarters is located.
  SimpleMarkerSymbol* simpleMarkerSymbol2 = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::Diamond, QColor("red"), 18.0f /*size*/, this);

  // Add a graphic to the graphic collection - polygon with a simple fill symbol.
  m_graphicsOverlay->graphics()->append(new Graphic(createPolygon(), simpleFillSymbol, this));

  // Add a graphic to the graphic collection - polyline with a simple line symbol.
  m_graphicsOverlay->graphics()->append(new Graphic(createPolyline(), simpleLineSymbol, this));

  // Add a graphic to the graphic collection - map point with a simple marker symbol.
  m_graphicsOverlay->graphics()->append(new Graphic(createPoint(), simpleMarkerSymbol2, this));

  // Add a graphic to the graphic collection - multi-point with a simple marker symbol.
  m_graphicsOverlay->graphics()->append(new Graphic(createMultipoint(), simpleMarkerSymbol, this));

  // Zoom to the extent of an envelope with some padding (10 device-independent pixels).
  m_mapView->setViewpointGeometry(createEnvelope(), 10);
}

// Return an envelope that covers the extent of the western United States.
Geometry CreateGeometries::createEnvelope() const
{
  constexpr double xMin = -123.0;
  constexpr double yMin = 33.5;
  constexpr double xMax = -101.0;
  constexpr double yMax = 48.0;
  const SpatialReference spatialRef(4326);

  return Envelope(xMin, yMin, xMax, yMax, spatialRef);
}

Geometry CreateGeometries::createPolygon() const
{
  // Create a polygon builder
  const SpatialReference spatialRef(4326);
  PolygonBuilder polygonBuilder(spatialRef);

  // add points to the builder that approximates the boundary of Colorado.
  polygonBuilder.addPoint(-109.048, 40.998);
  polygonBuilder.addPoint(-102.047, 40.998);
  polygonBuilder.addPoint(-102.037, 36.989);
  polygonBuilder.addPoint(-109.048, 36.998);

  // Return the geometry.
  return polygonBuilder.toGeometry();
}

Geometry CreateGeometries::createPolyline() const
{
  // Create a polyline builder
  const SpatialReference spatialRef(4326);
  PolylineBuilder polylineBuilder(spatialRef);

  // add points to the builder that approximates the border between California and Nevada.
  polylineBuilder.addPoint(-119.992, 41.989);
  polylineBuilder.addPoint(-119.994, 38.994);
  polylineBuilder.addPoint(-114.620, 35.0);

  // Return the geometry.
  return polylineBuilder.toGeometry();
}

Geometry CreateGeometries::createPoint() const
{
  constexpr double x = -117.195800;
  constexpr double y = 34.056295;
  const SpatialReference spatialRef(4326);

  // Return a map point where the Esri headquarters is located.
  return Point(x, y, spatialRef);
}

Geometry CreateGeometries::createMultipoint() const
{
  // Create a polygon builder
  const SpatialReference spatialRef(4326);
  MultipointBuilder multipointBuilder(spatialRef);

  // add points to the builder representing various state capital locations in the Western United States.
  multipointBuilder.points()->addPoint(-121.491014, 38.579065); // - Sacramento, CA
  multipointBuilder.points()->addPoint(-122.891366, 47.039231); // - Olympia, WA
  multipointBuilder.points()->addPoint(-123.043814, 44.93326); // - Salem, OR
  multipointBuilder.points()->addPoint(-119.766999, 39.164885); // - Carson City, NV

  // Return the geometry.
  return multipointBuilder.toGeometry();
}

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