topic Re: EXTENT not correct when rotating or tilting in ArcGIS JavaScript Maps SDK Questions

EXTENT not correct when rotating or tilting

MichaelK1 — Mon, 24 Oct 2022 08:50:04 GMT

We're using the extent property of a MapView/SceneView for calculating which graphics to apply for a specific area. (Based on which graphics are in bound of extent x - calculated server sided ).

Default extent property (simple fill red opacity 0.4) - working as expected

When rotating a view the extent does not change (with a watch util on view.extent):

When tilting or rotating in a SceneView.. Same results

Does ArcGis provide a way to get the actual extent (view area).

codepen: https://codepen.io/michaelk95/pen/BaVBrxo

Thanks

Re: EXTENT not correct when rotating or tilting

JayakumarPD — Mon, 24 Oct 2022 10:58:27 GMT

It is actually giving the actual extent only.

inside the map, what ever the graphic3(based on extent) you are rendering,

it is giving the actual extent only.

Are you expecting the map's extent? I think it is infinite in all direction.

View is dynamic, as and when user moves on, it will change. as per the function.

Re: EXTENT not correct when rotating or tilting

MichaelK1 — Mon, 24 Oct 2022 15:15:56 GMT

As you can see in the last image (SceneView), the actual view area is larger than the view's extent. (visible extent and yes it changes when a user is navigating or zooming). But is there any way of getting the actual viewing area? (Given a rotated sceneview or mapview).

Can you zoom a bit and rotate? You'll get the same result

Thanks

Re: EXTENT not correct when rotating or tilting

Anonymous User — Tue, 25 Oct 2022 05:25:26 GMT

Hi @MichaelK1

Thanks for reaching out! So this extent actually works as expected, it is defined as the minimum and maximum X and Y coordinates of a bounding box (see documentation of extent). So this is a bounding box which cannot be rotated.

This is a very simple implementation of the extent and does not represent the view area correctly as you mentioned. Unfortunately it is currently not possible to easily extract this information. As @JayakumarPD mentioned, this area can have quite complex geometry since it stretches to infinity as soon as you look to the horizon.

Maybe you could provide us with some description of the use case of why you need this functionality and we can try to find a solution.

Best, Daniel

Re: EXTENT not correct when rotating or tilting

MichaelK1 — Wed, 26 Oct 2022 07:19:16 GMT

Thanks @Anonymous User

Is there an alternative for calculating the area based on camera position/heading/tilt/view's extent? ArcGis has this functionality by default?

Thanks

Re: EXTENT not correct when rotating or tilting

Anonymous User — Mon, 31 Oct 2022 16:44:13 GMT

Hi @MichaelK1

Unfortunatly we currently offer no out-of-the-box alternative to this rectangular extent. However we are considering this feature for future releases.

We will give an update in this thread when we know more.

Re: EXTENT not correct when rotating or tilting

MatteoRizzi1 — Mon, 19 Aug 2024 14:19:11 GMT

Hi @MichaelK1

I am happy to share with you that we're adding support for a new visibleArea property (on both SceneView and MapView) in the upcoming release of the Maps SDK v4.31 . This will provide a more accurate calculation of the area seen in the view.

Meanwhile, if you want to test this before it heads to production, check out the development version of the API: https://js.arcgis.com/next.

Let us know if you have any feedback - thanks!