Changing geometry of an element in graphics layer is extremely slow

Kbperri — Tue, 22 Feb 2022 23:51:30 GMT

I am trying to set up a tool to allow the user to click a graphic element in the graphics layer and move it around the map. Moving the graphic is extremely slow and I'm wondering if there is a better way to do what I'm trying to do.

internal class MoveGraphics : MapTool { private int? movingGraphic = null; private IReadOnlyList<GraphicElement> currentElements; public MoveGraphics() { IsSketchTool = false; SketchType = SketchGeometryType.Point; SketchOutputMode = SketchOutputMode.Map; } protected override Task OnToolActivateAsync(bool active) { return base.OnToolActivateAsync(active); } protected override void OnToolMouseUp(MapViewMouseButtonEventArgs e) { movingGraphic = null; base.OnToolMouseUp(e); } protected override void OnToolMouseDown(MapViewMouseButtonEventArgs e) { e.Handled = true; } protected override Task HandleMouseDownAsync(MapViewMouseButtonEventArgs e) { return QueuedTask.Run(() => { var mp = MapView.Active.ClientToMap(e.ClientPoint); currentElements = Module1.Current.SelectedGraphicsLayerTOC.GetElementsAsFlattenedList(); var coordinates = currentElements.Select(graphic => graphic.GetAnchorPoint()); var multiPoint = MultipointBuilder.CreateMultipoint(coordinates, Module1.Current.SelectedGraphicsLayerTOC.GetSpatialReference()); var proximityResult = GeometryEngine.Instance.NearestVertex(multiPoint, mp); if (proximityResult.Distance < 0.0004) { movingGraphic = proximityResult.PointIndex; } }); } protected override void OnToolMouseMove(MapViewMouseEventArgs e) { if (!movingGraphic.HasValue) return; QueuedTask.Run(() => { var element = currentElements[movingGraphic.Value]; var mp = MapView.Active.ClientToMap(e.ClientPoint); var graphic = element.GetGraphic() as CIMPointGraphic; graphic.Location = mp; element.SetGraphic(graphic); }); } }

When the user clicks on the map, I determine which point was closest to the click using the GeometryEngine's NearestVertex method. When the mouse is moved if a graphic is selected, I get the GraphicElement object, I get the MapPoint of the mouse, I set the Location property of the graphic to the new MapPoint, and update the graphic of the element using SetGraphic. I have also tried using the SetAnchorPoint method as well. Both of these methods have been very slow and take a few seconds to move the point to the new mouse position. Does anyone have a better/faster way of moving point graphics?

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Changing geometry of an element in graphics layer is extremely slow