[Qgis-developer] QGIS 3.0: Plans to support librttopo?

[Mark Johnson]

>> I'm confused - what is missing?

The topic here is that when using MapUnits
- where the MapUnits are degrees
that a constant value (valid around the world) is not possible.

If you set this to 5 (intended as meters on the map)
- the further you zoom in, the circle will get bigger always showing an
area of 5 meters

If the Map is switched to WSG84
- then you will get 5 degrees and not the desired area of 5 meters
--> which for my area would be 0.000075, at the equator 0,000045 and in you
area something different

Since the source and destination crs are unknown when this attribute value
is being set
- one cannot assume that one or the other use meters and therefore cannot
be used

Mark
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-developer/attachments/20170307/13a66119/attachment.html>