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Showing content from https://developers.arcgis.com/qt/cpp/api-reference/esri-arcgisruntime-uniquevaluerenderer.html below:

UniqueValueRenderer Class | ArcGIS Maps SDK for Qt

UniqueValueRenderer Class

UniqueValueRenderer

class Esri::ArcGISRuntime::UniqueValueRenderer

A unique value renderer symbolizes geoelements with a distinct symbol for each unique data value in an attribute. More...

List of all members, including inherited members

Public Functions Detailed Description

A unique value renderer contains a collection of uniqueValues. Each UniqueValue has a UniqueValue::symbol and a collection of UniqueValue::values to define a value or combination of values.

This is typically used to visualize categories or data types. For example, you can use a unique value renderer to symbolize zoning designations: yellow for "Residential", purple for "Industrial", and green for both "Forests" and "Open land".

Example:

Apply a UniqueValueRenderer to a point feature layer repesenting California cities:

// Create the unique values for the different cities in California
auto* uniqueValue1 = new UniqueValue("Los Angeles", "The City of Los Angeles", QVariantList() << "Los Angeles", new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::Triangle, QColor(Qt::green), 4.0, this), this);
auto* uniqueValue2 = new UniqueValue("San Francisco", "The City of San Francisco", QVariantList() << "San Francisco", new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::Circle, QColor(Qt::red), 5.0, this), this);
auto* uniqueValue3 = new UniqueValue("San Diego", "The City of San Diego", QVariantList() << "San Diego", new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::Cross, QColor(Qt::blue), 8.0, this), this);
auto* uniqueValue4 = new UniqueValue("San Jose", "The City of San Jose", QVariantList() << "San Jose", new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::Diamond, QColor(Qt::yellow), 2.0, this), this);

// Add the unique values to the renderer
auto* uniqueRenderer = new UniqueValueRenderer("Unknown city", new SimpleMarkerSymbol(this), QStringList() << "CityName", QList<UniqueValue*>() << uniqueValue1 << uniqueValue2 << uniqueValue3 << uniqueValue4, this);

// Create a feature layer and apply the renderer to the layer
auto* featureTable = new ServiceFeatureTable(serviceUrl, this);
auto* featureLayer = new FeatureLayer(featureTable, this);
featureLayer->setRenderer(uniqueRenderer);

Relevant samples:

Apply unique values with alternate symbols: Apply a unique value with alternate symbols at different scales.
Create symbol styles from web styles: Create symbol styles from a style file hosted on a portal.
Unique value renderer: Render features in a layer using a distinct symbol for each unique attribute value.

See also UniqueValue and UniqueValueListModel.

Member Function Documentation [explicit] UniqueValueRenderer::UniqueValueRenderer(QObject *parent = nullptr)

Creates a new empty unique value renderer.

parent - The optional parent QObject.

UniqueValueRenderer::UniqueValueRenderer(const QString &defaultLabel, Esri::ArcGISRuntime::Symbol *symbol, const QStringList &fieldNames, const QList<Esri::ArcGISRuntime::UniqueValue *> &uniqueValues, QObject *parent = nullptr)

Creates a new unique value renderer object.

defaultLabel - The label used for the default symbol.
symbol - The default symbol for values that don't match any of the unique values.
fieldNames - A collection of the field names/attribute keys that the unique values apply to.
uniqueValues - A collection of unique values used by the renderer to select a symbol.
parent - The optional parent QObject.

[override virtual noexcept] UniqueValueRenderer::~UniqueValueRenderer()

Destructor.

QString UniqueValueRenderer::defaultLabel() const

Returns the label used for the default symbol.

See also setDefaultLabel.

Esri::ArcGISRuntime::Symbol *UniqueValueRenderer::defaultSymbol() const

Returns the default symbol for values that don't match any of the unique values.

See also setDefaultSymbol.

QStringList UniqueValueRenderer::fieldNames() const

Returns a list of the field names/attribute keys that the unique values apply to.

See also setFieldNames.

void UniqueValueRenderer::setDefaultLabel(const QString &label)

Sets the default label.

The default label is used if the graphic or feature's attribute value does not match any of the unique values.

See also defaultLabel.

void UniqueValueRenderer::setDefaultSymbol(Esri::ArcGISRuntime::Symbol *symbol)

Sets the default symbol.

The default symbol is used if the graphic or feature's attribute value does not match any of the unique values.

See also defaultSymbol.

void UniqueValueRenderer::setFieldNames(const QStringList &fieldNames)

Sets the list of fieldNames used in the renderer.

The names represent attributes of a graphic or feature that the renderer uses to match values against.

See also fieldNames.

Esri::ArcGISRuntime::UniqueValueListModel *UniqueValueRenderer::uniqueValues() const

Returns a collection of unique values for the renderer as a UniqueValueListModel.

The UniqueValueListModel contains a list model of all the unique values defined in the renderer.

See also UniqueValueListModel.

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