Draw on Map

MauricioRamirez1

We've developed an application using the Runtime SDK with QT.  We have a new requirement to allow users to draw areas on the map.  We've seen a few examples using C# and JavaScript, unfortunately we've not been able to find an example using C++ and QT.  They need the ability to  draw freehand and also by clicking points and have it auto close the shape. From other examples I've seen we need to have a FeatureService that will allow editing, but getting the map to accept clicks as points for a polygon has me puzzled.

TomNorby

Hi there, here's a quick untested code snippet that hopefully nudges you in the right direction, there may be a better way to do it, but it's repurposed from a gps breadcrumb function I had and looking at the SDK sample for Geometries>Nearest Vertex:

MapGraphicsView *map_control;

std::shared_ptr<GraphicsOverlay> layer_geometries;

std::shared_ptr<PolylineBuilder> polyline_tracks;

std::shared_ptr<SimpleLineSymbol> polyline_pen;

std::shared_ptr<Graphic> polyline_graphic;

// choose your line style

polyline_pen = std::make_shared<SimpleLineSymbol>(SimpleLineSymbolStyle::Dot, QColor(0, 0, 255, 100), 5);

map_control = new MapGraphicsView(this);

layer_geometries = std::make_shared<GraphicsOverlay>();

map_control->graphicsOverlays()->append(p->layer_geometries.get());

connect(m_mapView, &MapGraphicsView::mouseClicked, this, [=](QMouseEvent& e)

{

Point clicked_location = map_control->screenToLocation(e.x(), e.y());
polyline_tracks->addPoint(clicked_location );

std::shared_ptr<PolylineBuilder>close_points(p->gps_tracks);

close_points->addPoint(p->gps_tracks->parts()->part(0)->startPoint());

polyline_graphic= std::make_shared<Graphic>(close_points->toGeometry(), polyline_pen.get());

layer_geometries->graphics()->clear();

layer_geometries->graphics()->append(p->polyline_graphic.get());

});

Edit: Check out this sample program with markup - Markup Documentation. Source code here: dynamic-situational-awareness-qt/Shared/markup