Hi, I have a points list and I want to sort it by X coordinate first and then by Y coordinate.
If I use the “sort list” component I only able to sort it according to X coordinate or to Y coordinate.
Someone can help me?
Thanks.
Sorry, no.
You can also do this with the Sort Points component.
This shows how to do the same thing with a GhPython or C# script.
sort_points.gh (15.4 KB)
-Kevin
Sorting with @kev.r solutions seem to fail on the points provided further above.
Using my Grasshopper sorting above and string formatting, the coordinates look like this:
Looks like the values provided should be rounded before sorting:
Test.gh (30.1 KB)
I usually do something like this in Python:
(Edit* I made a small change)
Test_v3.gh (8.4 KB)
To use Sort Points, you could also round in Python.
import rhinoscriptsyntax as rs
rnd = 3
npnts = [rs.AddPoint(round(i.X,rnd),round(i.Y,rnd),round(i.Z,rnd)) for i in pnts]
npnts = rs.coerce3dpointlist(npnts)
a = rs.SortPoints(npnts, True,0)
I usually use this pattern when sorting by an object property:
Yes, old trick. You can round point coordinates to any precision using an expression: round(Pt,P)
Thanks
Translate this (in C#): pList = pList.OrderBy(x=>x.X).ThenBy(x=>x.Y).ToList();
ot for rounded coords use: (x=>Math.Round(x.X, decimals)) , (x=>Math.Round(x.Y, decimals))
By the way, you can change the way points are sorted like this (Y, X, Z):
Or sort by Z first, then Y, then X.
