Add WMS capabilities

[leonardooyama]

Some of the servers that I need to use, such as "https://bdgex.eb.mil.br/mapcache", provide the maps using the WMS protocol (https://en.wikipedia.org/wiki/Web_Map_Service). Is it possible to use (or adapt) your API to visualize data from these kind of servers?

[AmonRaNet]

QGV by default not provides any solutions to handle external data. Exceptions is only background maps as raster tiles like OSM. It mean is no support of WMS by default. There was small sub-projects to introduce some vector data support over GDAL, but till now nothing official.

What kind of data from WMS you plan to show? When it should be simple rendered as raster maybe you can use proxy layer, like with https://mapserver.org/introduction.html#mapserver-overview ?

[leonardooyama]

There is an YouTube video that teaches how to do such task in QGIS: https://www.youtube.com/watch?v=zgIs-8ZG4_c.

[AmonRaNet]

I know about QGIS :)

QGIS and QGeoView in different leagues, where QGIS is standalone solution to load/convert/render big set of cartographic data sources. QGeoView is light-weighted render library to create geo-view in Qt app. It mean theoretically you can render any kind of data, but only if you implement yourself converter of your data to QGeoView model.

As I said above: by default QGeoView can work with XYZ scheme. As long your data source is accessible over http/ftp/file in XYZ scheme - you can easy add this with few method calls (please check in demo: BackgroundDemo + CUSTOM_OSM).

Anything which is not TMS (XYZ model):

• or you implement data reader (read data, render it as you want with your QGVDrawItem)

this is too large topic to answer here and probably not needed for you at all.

• or you implement proxy which will read data from WMS, but QGeoView will treat it as XYZ tile

For example here you can find example how to convert XYZ request to bounding box, which can be later used to request more or less single tile from WMS. It mean you will need to implement custom QGVLayerTilesOnline with override for virtual QString tilePosToUrl(const QGV::GeoTilePos& tilePos) const = 0. Input is XYZ coordinates, return should be WMS URL (GetMap) to request single tile as image.

Very random pick-up for WMS request: https://wms.geo.admin.ch/?SERVICE=WMS&REQUEST=GetMap&VERSION=1.3.0&LAYERS=ch.bafu.bundesinventare-bln&STYLES=default&CRS=EPSG:2056&BBOX=2550000,1060000,2660000,1140000&WIDTH=800&HEIGHT=582&FORMAT=image/png

• or you use external tool which will act for you as XYZ server (tool will read WMS, shapefiles, etc and will expose it for you as XYZ server)

There is several solutions. One of them is MapServer

[leonardooyama]

Got it. I will try to implement this and make a pull request

[leonardooyama]

In order to avoid ssl verification, I added the following lines to the file QGVLayerTilesOnline.cpp, after line 43:

QSslConfiguration conf = request.sslConfiguration(); conf.setPeerVerifyMode(QSslSocket::VerifyNone); request.setSslConfiguration(conf);

[AmonRaNet]

PR merged