6
In the Processing Toolbox use the Extract Specific Vertices tool, for the Vertex indices use 0 for the first vertex and -1 for the last vertex. Which one you need will depend on the direction of the line.
EDIT: Apologies, I didn't read your question properly, you said automatically. If it's just for display purposed you could use a geometry generator ...
5
Tested on QGIS 2.18 and QGIS 3.4
I can suggest using a "Virtual Layer" through Layer > Add Layer > Add/Edit Virtual Layer...
Let's assume there is a polyline layer called "polylines" (blue lines).
With the following Query, it is possible to create a point at the end of each line.
SELECT st_endpoint(geometry), *
FROM "polylines"
The output point ...
3
I've changed names of variables to be more eligible/legible for other readers.
def getPointFromFeature(self, featureID, layer):
expr = QgsExpression("Id = '"+featureID+"'")
selection = self.selectionByExpr(layer, expr)
geom = selection[0].geometry() # removed asPoint()
return geom
def getDistances(self, point_geom, river_geom):
d = ...
2
I will describe 2 possibilities, the first is more easy and elegant but works only from QGIS 3.10. The second also works for older versions.
Possibility 1: Use the geometry generator for labels. It is new since version 3.10 but very powerful. The expression will be
convex_hull(collect ($geometry, "id"))
this will build a convex hull around buildings with ...
2
Tested on QGIS 2.18 and QGIS 3.4
I can suggest using a "Virtual Layer" through Layer > Add Layer > Add/Edit Virtual Layer...
I have tried to recreate your example. There are two overlapping polygon layers called "layer"(yellow) and "grid_layer"(blue) accordingly, see image below.
All features of "grid_layer" squares have 10.000 m² area.
With the ...
1
If you want to write all the values of the ycoord field into a .txt file, you can execute the following code in the Python Console of QGIS (change the parameters with your own):
layer = iface.activeLayer() # your layer
features = layer.getFeatures() # features of your layer
with open('C:/Users/v.bre/Downloads/ycoord.txt','w') as my_file: # Change the path ...
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