[QGIS-Developer] Incremental drawing possible?

[Martin Dobias]

On Tue, Jul 11, 2017 at 5:44 AM, Nyall Dawson <nyall.dawson at gmail.com> wrote:
> On 11 July 2017 at 13:17, John Abraham <jea at hbaspecto.com> wrote:
>> Ok, I overlooked a few features, thanks Nathan for pointing out the refresh
>> rate!
>>
>> I rely on web based tile or WMS backgrounds (OpenStreetMap, NRCan Geogratis,
>> etc.).  CityPhi fills in the background as the tiles show up.  QGIS seems to
>> need to draw the entire background in it's head, then displays it all at
>> once, before it can use the cool multithreaded features on the vectors.  Or
>> is there another checkbox for "draw my background as it arrives from the
>> tile service, but don't wait around for it to respond"?
>
> How are you adding your web based tile layers?
>
> Since QGIS 2.18 you can add them as "XYZ" tile sources (see
> https://www.qgis.org/en/site/forusers/visualchangelog218/index.html#feature-native-support-of-xyz-tile-layers).
>
> If you do this they'll be super-smooth, with tiles being rendered
> instantly as they download.

Since QGIS 2.18 the instant preview works also with WMTS rasters:
https://www.qgis.org/en/site/forusers/visualchangelog218/index.html#feature-preview-of-raster-tiles-wmts-and-xyz-layers

Regards
Martin