topic Can I place a line on a point using an attribute for the angle? in Python Questions

Can I place a line on a point using an attribute for the angle?

KristineMuma — Fri, 24 Jul 2015 19:59:32 GMT

I have a set of points that I need to label in another software that has very limited labeling capabilities. We really need to be able to rotate the label by an attribute that we store. We came up with the desire to be able to place a line on that point of a predefined length and set the direction of the line to be in the angle of the rotation field. Has anyone ever attempted this?

Re: Can I place a line on a point using an attribute for the angle?

WesMiller — Fri, 24 Jul 2015 20:10:18 GMT

Have you considered Annotation

http://resources.arcgis.com/en/help/main/10.2/index.html#//01m70000000w000000

Re: Can I place a line on a point using an attribute for the angle?

DarrenWiens2 — Sat, 11 Dec 2021 23:56:15 GMT

Here's a script that should do what you're after:

>>> newLines = []
... points = "grid_label"
... angleField = "OID"
... lineLength = 300
... sr = arcpy.Describe(points).spatialReference
... with arcpy.da.SearchCursor(points,["SHAPE@",angleField],spatial_reference=sr) as cursor:
...     for row in cursor:
...         x1 = row[0].centroid.X + (math.sin(math.radians(row[1]))*(lineLength/2))
...         y1 = row[0].centroid.Y + (math.cos(math.radians(row[1]))*(lineLength/2))
...         x2 = row[0].centroid.X - (math.sin(math.radians(row[1]))*(lineLength/2))
...         y2 = row[0].centroid.Y - (math.cos(math.radians(row[1]))*(lineLength/2))
...         newLine = arcpy.Polyline(arcpy.Array([arcpy.Point(x1,y1),arcpy.Point(x2,y2)]),sr)
...         newLines.append(newLine)
... arcpy.CopyFeatures_management(newLines,r'in_memory\lines')

Re: Can I place a line on a point using an attribute for the angle?

KristineMuma — Mon, 27 Jul 2015 13:50:03 GMT

Unfortunately Annotation is not an option. And using the annotation polygon isn't working because anything that is a single digit is labeling incorrectly or not at all in this third party software. We are extremely disappointed that this was not going to work! Thanks

Re: Can I place a line on a point using an attribute for the angle?

KristineMuma — Mon, 27 Jul 2015 14:17:04 GMT

Thanks Darren! I am so new to Python I knew I didn't have time to attempt to figure it out on my own. I can't wait to try this....

>>> Darren Wiens <geonet@esri.com> 7/24/2015 4:29 PM >>>

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Can I place a line on a point using an attribute for the angle?

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Here's a script that should do what you're after:

>>> newLines = []

... points = "grid_label"

... angleField = "OID"

... lineLength = 300

... sr = arcpy.Describe(points).spatialReference

... with arcpy.da.SearchCursor(points,["SHAPE@",angleField]) as cursor:

... for row in cursor:

... x1 = row[0].centroid.X + (math.sin(math.radians(row[1]))*(lineLength/2))

... y1 = row[0].centroid.Y + (math.cos(math.radians(row[1]))*(lineLength/2))

... x2 = row[0].centroid.X - (math.sin(math.radians(row[1]))*(lineLength/2))

... y2 = row[0].centroid.Y - (math.cos(math.radians(row[1]))*(lineLength/2))

... newLine = arcpy.Polyline(arcpy.Array())

... newLines.append(newLine)

... arcpy.CopyFeatures_management(newLines,r'in_memory\lines')

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