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

PolylineBuilder Class | ArcGIS Maps SDK for Qt

PolylineBuilder

class Esri::ArcGISRuntime::PolylineBuilder

The polyline builder allows you to create and modify Polyline geometries incrementally. More...

List of all members, including inherited members

Public Functions PolylineBuilder(const Esri::ArcGISRuntime::Polyline &polyline, QObject *parent = nullptr) PolylineBuilder(const Esri::ArcGISRuntime::SpatialReference &spatialReference, QObject *parent = nullptr) virtual ~PolylineBuilder() override Esri::ArcGISRuntime::Polyline toPolyline() const Reimplemented Public Functions virtual Esri::ArcGISRuntime::GeometryBuilderType geometryBuilderType() const override virtual Esri::ArcGISRuntime::Geometry toGeometry() const override Detailed Description

Polyline geometries are immutable and cannot be changed directly once created. The polyline builder allows you to change the contents of the shape by using the mutable PartCollection that is accessible from MultipartBuilder::parts. Each Part, in the collection, comprises a collection of segments that make the Part. You can add or remove a Part from the PartCollection, or you can create a new or edit the segment vertices of an existing Part. Use GeometryBuilder::toGeometry to return the new Polyline from the builder.

// create a PolylineBuilder and a single-part polyline
auto* builder = new PolylineBuilder(SpatialReference(4326), this);
builder->addPoint(-117.0, 34.0);
builder->addPoint(-118.0, 34.0);
Polyline singleLine = builder->toPolyline();

// create a multi-part polyline using the same PolylineBuilder
Part* part1 = new Part(builder->spatialReference(), this);
Part* part2 = new Part(builder->spatialReference(), this);
part1->addPoint(-116.0, 33.0);
part1->addPoint(-116.5, 33.5);
part2->addPoint(-115.0, 33.0);
part2->addPoint(-115.5, 33.5);
auto* pCollection = new PartCollection(builder->spatialReference(), this);
pCollection->addPart(part1);
pCollection->addPart(part2);
builder->setParts(pCollection);
Polyline multiPart = builder->toPolyline();

Relevant samples:

Add graphics with renderer: A renderer allows you to change the style of all graphics in a graphics overlay by referencing a single symbol style.

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