layersqgis
Just wondering if anyone ever experiences any problems moving layers? I have set up QGIS in the office and it works brilliantly for everyone apart from one of my colleagues who finds that on odd occassions he cannot move the order of his layers around. No error messages come up but nothing happens when he tries to drag the layers. This only goes away when he restarts his QGIS.
The version of QGIS is 2.8 and we are using Windows 8.
Anyone know what the problem is here?
I've got the same task with polygons' and points' layers (most of points are snapped to polygons, so I have to be precise).
I assume, the best way to solve this task is by transfering all layers to the polygon type:
Still not perfect, but way better :)
It's also possible to do the same with the lines' layer
One option is to use an endpoint point layer, the existing pole polygon layer and to compute a virtual lines layer, that is updated each time the map is moved.
The endpoint must have a poleID attribute, that is populated of the polygon it should be connected to.
The pole layer must have a unique poleID attribute.
The virtual layer can have any attribute from the endpoint or the pole layer, in addition to create a line between the two geometries.
When you touch the map (pan, move, refresh etc), the lines are automatically recomputed. You can use the virtual layer like any other layer, or you can export it to another format if you need to persist the data.
Go the the menu layer / add layer / add-edit virtual layer and enter the following query.
select p.poleID, pt.ptID, ST_ShortestLine(p.geometry,pt.geometry)
from endPoints pt
join pole p
on pt.poleID=p.poleID
after moving the pole polygon:
PS: this solution produces real lines that can be used for further analysis, in contrast with the excellent geometry_generator solution that produces lines for display only.
Best Answer
This could potentially be down to the two different layer panels:
One is Layer order and the other is Layers:
Untick the "Control rendering order" in the Layer order panel, which will then allow you to control it through the main Layers panel.
To turn these on and off use the: View>Panels menu