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in QGIS I have to draw a scheme ( kind of CAD) that represents electrical circuits. The scheme consists of points and lines elements, with alphanumeric attributes associated.

The starting point and the ending point are connected by 1 or more lines, drawn with snap (there are intermediate points). For example:

CIRCUIT A: X--------------------------X-------------X---------X P1 L1 P2 L2 P3 L3 P4

​CIRCUIT B:​ ​ X-------------------X-------------X P5 L4 P6 L5 P7

This is an examples of my net:

enter image description here

Having selected the starting point only, I would like to determine what is the set of lines that make the connection and eventually what is the ending point.

In QGIS are there "native" network analysis / routing functions or plug-ins for network analysis?

I currently use QGIS 3.0 but I could eventually install a previous version if needed.

  • Hello Stefan and thanks for your support. I installed QGIS v. 2.18 and I use Road graph plug-ins. The problem is that the plug-ins require n. 2 points: start and end point. My needs is to have start point only. Please could you suggest me a solution? Thanks – Giuseppe Mar 13 '18 at 8:43
  • Please add some more information about your data: 1. How is the data stored (shapefile, text-files, etc.)? In which way are geometries/features stored (linestrings, multilinestrings, etc.)? Which other attributes are describing your features? If it is possible, please add a meaningful picture (e.g. of the QGIS Canvas). – Stefan Mar 13 '18 at 8:55
  • Hello Stefan, actually data is stored in shapefile (line and point); I have only one attribute: ID – Giuseppe Mar 13 '18 at 9:04
  • This could also be interesting for you: gis.stackexchange.com/questions/86613/… – Stefan Mar 13 '18 at 9:44

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