Latest Contributions by johnmarker

Hello, I want to be able to register a mouse click event and then plot a point graphic at that location. Right now I get the mouse click, get the location of that mouse click and then use those coordinates to create a graphic. After doing all this the point still does not display onto the map..   //MainWindow.xaml.cs private void MainMapView_MouseLeftButtonUp(object sender, MouseButtonEventArgs e) { MapViewModel mvm = new MapViewModel(); Point p = e.GetPosition(MainMapView); MapPoint mp = MainMapView.ScreenToLocation(e.GetPosition(MainMapView)); mvm.createPoint(mp); } //MapViewModel.cs public void createPoint(MapPoint point) { // Create a new graphics overlay to contain a variety of graphics. var graphicsOverlay = new GraphicsOverlay(); // Add the overlay to a graphics overlay collection. GraphicsOverlayCollection overlays = new GraphicsOverlayCollection { graphicsOverlay }; // Set the view model's "GraphicsOverlays" property (will be consumed by the map view). this.GraphicsOverlays = overlays; var mapPoint = new MapPoint(point.X, point.Y, SpatialReferences.Wgs84); // Create a symbol to define how the point is displayed. var pointSymbol = new SimpleMarkerSymbol { Style = SimpleMarkerSymbolStyle.X, Color = System.Drawing.Color.Red, Size = 10.0 }; // Add an outline to the symbol. pointSymbol.Outline = new SimpleLineSymbol { Style = SimpleLineSymbolStyle.Solid, Color = System.Drawing.Color.Red, Width = 2.0 }; // Create a point graphic with the geometry and symbol. var pointGraphic = new Graphic(mapPoint, pointSymbol); // Add the point graphic to graphics overlay. graphicsOverlay.Graphics.Add(pointGraphic); } ... View more

I have been following  the the two very beginning tutorials, the first being display a map and the second being add a point, line and polyline. I tweaked just a little so that rather than hard coding the points in from the start I allow for a mouse click which would add a new graphic point at that location. I have the mouse event and the location recognized and have created a graphic symbol (a point) at that location. What I'm stuck on is now having that point display on the map. I'm not quite sure what notifier I need to use so that the map can know there was a change and then display that change.     display_a_map.cpp void Display_a_map::mapClickHandler(QMouseEvent &event) { Point clickedPoint = m_mapView->screenToLocation(event.x(), event.y()); GraphicsOverlay* overlay = new GraphicsOverlay(this); createGraphics(overlay, clickedPoint.x(), clickedPoint.y()); m_mapView->graphicsOverlays()->append(overlay); //Point graphic created. Now needs to be displayed } void Display_a_map::createGraphics(GraphicsOverlay *overlay) { const Point dume_beach(-118.80657463861, 34.0005930608889, SpatialReference::wgs84()); //const Point dume_beach(pointX, pointY, SpatialReference::wgs84()); // Create symbols for the point SimpleLineSymbol* point_outline = new SimpleLineSymbol(SimpleLineSymbolStyle::Solid, QColor(Qt::blue), 3, this); SimpleMarkerSymbol* point_symbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle::Circle, QColor(Qt::blue), 10, this); point_symbol->setOutline(point_outline); // Create a graphic to display the point with its symbology Graphic* point_graphic = new Graphic(dume_beach, point_symbol, this); // Add point graphic to the graphics overlay overlay->graphics()->append(point_graphic); }   ... View more

I'm developing in Qt with C++. I have displayed a map and want to be able to register when the mouse clicks on a location on the map. in my class .cpp file I have tried including the mouseClicked(QMouseEvent *event), but this is never called when I click.   Display_a_map.cpp void Display_a_map::mouseClicked(QMouseEvent *event) { if (event->button() == Qt::LeftButton) { qDebug() << "testing"; } }   ... View more