Display a shapefile with custom symbology.
Use case
Feature layers created from shapefiles do not possess any rendering information, and will be assigned with a default symbology. You can apply custom styling to ensure that the content is visible and usable in the context of a specific map. For example, you could use this to visually differentiate between features originating from two different shapefiles, by applying a blue color to one, and a red color to the other.
How to use the sample
Click the button to apply a new symbology renderer to the feature layer created from the shapefile.
How it works
- Create a
ShapefileFeatureTable, providing the path to a shapefile. - Create a
FeatureLayerand associate it with theShapeFileFeatureTable. - Create a
SimpleRendererto override the default symbology. The simple renderer takes a symbol and applies that to all features in a layer. - Apply the renderer to the
FeatureLayerby setting the renderer.
Relevant API
- FeatureLayer
- ShapefileFeatureTable
- SimpleFillSymbol
- SimpleLineSymbol
- SimpleRenderer
Offline Data
To set up the sample's offline data, see the Use offline data in the samples section of the Qt Samples repository overview.
| Link | Local Location |
|---|---|
| Aurora Subdivions Shapefile | <userhome>/ArcGIS/Runtime/Data/shp/Subdivisions.shp |
About the data
This sample displays a shapefile containing subdivisions in Aurora, CO.
Additional information
While shapefiles contain no rendering information, other data sources such as Service Feature Tables or Geodatabase Feature Tables can contain such information. As a result, the rendering properties of the other data sources can be pre-defined by the author.
Tags
package, shape file, shapefile, symbology, visualization
Sample Code
// [WriteFile Name=SymbolizeShapefile, Category=DisplayInformation] // [Legal] // Copyright 2017 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 // sample headers #include "SymbolizeShapefile.h" // ArcGIS Maps SDK headers #include "FeatureLayer.h" #include "LayerListModel.h" #include "Map.h" #include "MapQuickView.h" #include "MapTypes.h" #include "Point.h" #include "ShapefileFeatureTable.h" #include "SimpleFillSymbol.h" #include "SimpleLineSymbol.h" #include "SimpleRenderer.h" #include "SpatialReference.h" #include "SymbolTypes.h" #include "Viewpoint.h" // Qt headers #include <QStandardPaths> #include <QUrl> #include <QtCore/qglobal.h> using namespace Esri::ArcGISRuntime; // helper method to get cross platform data path namespace { QString defaultDataPath() { QString dataPath; #ifdef Q_OS_IOS dataPath = QStandardPaths::writableLocation(QStandardPaths::DocumentsLocation); #else dataPath = QStandardPaths::writableLocation(QStandardPaths::HomeLocation); #endif return dataPath; } } // namespace SymbolizeShapefile::SymbolizeShapefile(QQuickItem* parent /* = nullptr */): QQuickItem(parent) { } void SymbolizeShapefile::init() { // Register the map view for QML qmlRegisterType<MapQuickView>("Esri.Samples", 1, 0, "MapView"); qmlRegisterType<SymbolizeShapefile>("Esri.Samples", 1, 0, "SymbolizeShapefileSample"); } void SymbolizeShapefile::componentComplete() { QQuickItem::componentComplete(); // find QML MapView component m_mapView = findChild<MapQuickView*>("mapView"); // Create a map using the streets vector basemap m_map = new Map(BasemapStyle::ArcGISStreets, this); // Set an initial viewpoint const Point pt(-11662054, 4818336, SpatialReference(3857)); const Viewpoint vp(pt, 200000); m_map->setInitialViewpoint(vp); // Create the ShapefileFeatureTable const QString dataPath = defaultDataPath() + "/ArcGIS/Runtime/Data/shp"; ShapefileFeatureTable* shp = new ShapefileFeatureTable(dataPath + "/Subdivisions.shp", this); // Create the FeatureLayer m_featureLayer = new FeatureLayer(shp, this); m_map->operationalLayers()->append(m_featureLayer); // Set map to map view m_mapView->setMap(m_map); } void SymbolizeShapefile::updateRenderer() { // Create the Symbol SimpleFillSymbol* sfs = new SimpleFillSymbol(SimpleFillSymbolStyle::Solid, QColor("yellow"), this); SimpleLineSymbol* sls = new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, QColor("red"), 1.0f, this); sfs->setOutline(sls); // Create the Renderer SimpleRenderer* simpleRenderer = new SimpleRenderer(sfs, this); // Set the Renderer on the Layer m_featureLayer->setRenderer(simpleRenderer); }