Q&A - Question

TatukGIS Viewer is still based on the DK 10 where IncrementalPaint is working the old way. The DK 11 has changed drawing logic and IncrementalPaint is limited to partial updates only so drawing while panning is not possible.

Is this feature planned to be added?

And how is this drawing and panning done in ASP.NET? Many webapplications can very smoothly pan or drag the map where the map never shows white areas.

Why is this behavior changed in the DK11? Why would you not do an incremental paint while drawing?

I miss the reason why this behavior is removed.

We did it during beta stage and no one complained!

Generally redrawing a vector layer upon dragging requires continues rendering which is a very processir intensive task. Upon evaluation customer feedback over time we found it as a troublemaker and we were never able to achieve performance that will be satisfied for everyone.

Web applications use predefined / p[recomputed tiles and scaling is possible only x2.

But we will consider to find a some kind of compromised solution

 

Well I must say I have had very nice and fast results. Some things should be considered here for a good performance:

- do not do this incremental paint for many layers, just the ones you are really interested in.
- check the styling mechanism, complicated styling mechanism or OnPaintShape events or so should be avoided.
- check the storage: database (optimise database for speed or file, network or local.
- do not use it on webservices.
- do not use it on big raster files or grids.

Problem with prefetching data is the very fast spatial scanning that must be done during dragging the map.

Let's hope you will find a solution to get it back in DK11 because I always used it for topography layers and network layers with e.g. pipes.