Programmatically activate zoombox

Question

In 10.2.x, you can activate the zoombox by holding down the SHIFT key while dragging your mouse.  This requires a two hand operation so it's a bit tricky when you try to operate a device (without multi-touch) inside a vehicle.  Is there a way to programmatically enable/disable this dragging zoom box mode?

HuyHo · Answer

Thanks Jennifer.  I thought of having to do something like that, but I was hoping there was some other way so that we do not need to re-invent the wheel.

JenniferNery · Answer

Actually you can also use extent height and width to calculate zoom factor.

var currentMapExtent = MyMapView.GetCurrentViewpoint(ViewpointType.BoundingGeometry).TargetGeometry.Extent;

var zoomFactor = Math.Min(currentMapExtent.Width/geometry.Extent.Width, currentMapExtent.Height/geometry.Extent.Height);

await MyMapView.SetViewpointCenterAsync(geometry.Extent.GetCenter(), MyMapView.MapScale/zoomFactor);

JenniferNery · Answer

I see you can use SketchEditor to draw the zoom box and use the resulting geometry's extent to zoom into its center. When you draw the shape, it would be mouse down and drag to desired size, when you let go you will get a polygon of rectangle shape.

For example on a button click:

var geometry = await MyMapView.SketchEditor.StartAsync(SketchCreationMode.Rectangle, false); // Boolean indicates it will complete when geometry is drawn and no need to go to edit mode.

await MyMapView.SetViewpointCenterAsync(geometry.Extent.GetCenter(), MyMapView.MapScale/2); // or whatever zoom factor you choose.