//When the Draw Line button is clicked:
//The skecth (a polyline graphic) will be created and will be added to the sketch layer
//The sketch layer will be added to the map for display
//2 map events will be registered for user's interaction
private void AddGraphics_Click(object sender, RoutedEventArgs e)
{
//Take the first map widget from the view
MapWidget mapWidget = OperationsDashboard.Instance.Widgets.First(w => w.GetType() == typeof(MapWidget)) as MapWidget;
if (mapWidget == null || mapWidget.Map == null)
{
return;
}
MapWidget = mapWidget;
client.Map map = MapWidget.Map;
//First, remove any existing graphic layer on the map
RemoveAllGraphicLayers();
//Create the geometry (a polyline) for the sketch
sketchGeometry = new client.Geometry.Polyline();
sketchGeometry.SpatialReference = map.SpatialReference;
sketchGeometry.Paths.Add(new client.Geometry.PointCollection());
//Create the sketch with the geometry and a symbol
client.Graphic sketch = new client.Graphic()
{
Symbol = SimplePolylineSymbol.CreateLineSymbol(),
Geometry = sketchGeometry,
};
//Add the sketch to the map sketch layer
//mapSketchLyr.Graphics.Clear();
mapSketchLyr.Graphics.Add(sketch);
//Add the sketch layer back to the map
map.Layers.Add(mapSketchLyr);
//Register mouse click i.e. sketch begins
//Register mouse double click i.e. sketch finishes
map.MouseClick += map_MouseClick;
map.MouseDoubleClick += map_MouseDoubleClick;
map.MouseMove += map_MouseMove;
}
//Add a map point (from mouse click) to the geometry of the sketch
//Create a temporary graphic to trace user's mouse movement
void map_MouseClick(object sender, client.Map.MouseEventArgs e)
{
sketchGeometry.Paths[0].Add(e.MapPoint);
//feedback layer
feedBackLyr.Graphics.Clear();
client.Map map = MapWidget.Map;
#region Create a temporary graphic to trace user's mouse movement
//Create a point collection using the last clicked point and the latest mouse position
PointCollection pc = new PointCollection();
pc.Add(sketchGeometry.Paths[0].Last());
pc.Add(new MapPoint());
//Create the geometry of the feedback line using the point collection
client.Geometry.Polyline feedbackGeomrtry = new client.Geometry.Polyline();
feedbackGeomrtry.SpatialReference = map.SpatialReference;
feedbackGeomrtry.Paths.Add(pc);
//Create the feedback line with the geometry and a symbol
client.Graphic feedback = new client.Graphic()
{
Symbol = SimplePolylineSymbol.CreateLineSymbol(),
Geometry = feedbackGeomrtry,
};
#endregion
//Add the feedback line to the feedback layer
feedBackLyr.Graphics.Add(feedback);
//Add the layer to the map if we haevn't done so
if (!map.Layers.Contains(feedBackLyr))
{
map.Layers.Add(feedBackLyr);
}
}