topic Re: Rotate Point Symbol in Python Questions

Rotate Point Symbol

LarryAdgate — Thu, 22 Oct 2015 16:24:21 GMT

I am looking for data that would function in a field calculator and would automatically rotate a point symbol (or water pipe cap symbol) 90 degrees to a line featureclass. I have aprox. three thousand point symbols and rotating all of them manually is cost prohibitive. Attached is an example of what I am trying to achieve and if there are other methods please share.

Thanks,

Larry Adgate

Re: Rotate Point Symbol

DanPatterson_Retired — Thu, 22 Oct 2015 17:33:18 GMT

Larry ... you might want to 'unanswer' your question as being answered, should you wish to get a response

Re: Rotate Point Symbol

DarrenWiens2 — Thu, 22 Oct 2015 17:40:41 GMT

Your main task is figuring out the angle of the line and transferring it to the point. You can do this using arcpy Polyline geometry vertices, good, old-fashioned trigonometry, and a Spatial Join.

When you've got some code going, post it for more help.

Re: Rotate Point Symbol

LarryAdgate — Thu, 22 Oct 2015 18:36:51 GMT

Thank You Darren, This is enough information to solve the issue

Re: Rotate Point Symbol

DarrenWiens2 — Sat, 11 Dec 2021 22:09:45 GMT

Here is some code that should get you most of the way there:

>>> import math
... arcpy.CreateFeatureclass_management(r'in_memory','points',"POINT")
... arcpy.AddField_management(r'in_memory\points',"Angle","DOUBLE")
... sr = arcpy.Describe("line").spatialReference
... insCur = arcpy.da.InsertCursor(r'in_memory\points',["SHAPE@","Angle"])
... with arcpy.da.SearchCursor("line","SHAPE@",spatial_reference=sr) as cursor:
...    for row in cursor:
...        for part in row[0]:
...            first = 1
...            for pnt in part:
...                if first == 0:
...                    dx = pnt.X - prev.X
...                    dy = pnt.Y - prev.Y
...                    angle = math.degrees(math.atan(dy/dx))+90
...                    insCur.insertRow([pnt,angle])
...                prev = pnt
...                first = 0

...and the resulting points, symbolized using Arithmetic rotation style.

Re: Rotate Point Symbol

LarryAdgate — Mon, 26 Oct 2015 14:38:33 GMT

Hi Darren, thanks for the script, this is really more than what I expected,

Larry