topic Re: Calculation rule for line cutting in Attribute Rules Questions

Calculation rule for line cutting

HNTZK46 — Tue, 03 May 2022 20:35:24 GMT

Hello ESRI people,

I am thinking if it is possible to cut a line at the intersection of an inserted line.

It seems like we can achieve this by a point of point feature class for cutting a line of line feature class. But I am just wondering if we can do by only using a single line feature class, i.e. Both the target line and the inserted line are same feature class.

Thanks in advance!

Re: Calculation rule for line cutting

JohannesLindner — Wed, 04 May 2022 06:32:23 GMT

It should be possible. Something like this (completely untested!)

// Calculation Attribute Rule on LineFC // Field: empty // triggers: insert(, update) // load the whole LineFC var line_fs = FeatureSetByNAme($datastore, "LineFC", ["GlobalID"], true) // get the intersecting lines var intersect_lines = Intersects(line_fs, $feature) // create and fill adds and deletes arrays var adds = [] var deletes = [] for(var i_line in intersect_lines) { // get intersection geometry var i_geom = Intersection(i_line, $feature) // there are multiple conditions where we don't want to cut the line: // intersection isn't a point (overlapping lines or i_line == $feature) // i_line is intersecting $feature on start or end point if(i_geom.type != "Point" || Equals(i_geom, Geometry(i_line).paths[0][0] || Equals(i_geom, Geometry(i_line).paths[-1][-1] ) { continue } // cut i_line with $feature, delete the original, add the cut parts var cut_parts = Cut(i_line, $feature) Push(deletes, {"globalID": i_line.GlobalID}) for(var p in cut_parts) { Push(adds, {"geometry": cut_parts[p]}) } } // apply the edits return { "edit": [ { "className": "LineFC", "adds": adds, "deletes": deletes } ] }

Re: Calculation rule for line cutting

HNTZK46 — Wed, 04 May 2022 21:48:30 GMT

Hi Johannes,

I applied your Arcade expression for a line feature class but unfortunately got an error, saying "Arcade error: Unexpected null, Script line: 20".

Unfortunately I don't know how to workaround this. If you could tell me any solution to this, that would be much appreciated.

Re: Calculation rule for line cutting

JohannesLindner — Thu, 05 May 2022 04:53:13 GMT

Include a null check in the conditions:

if(i_geom == null || i_geom.type != "Point" || Equals(i_geom, Geometry(i_line).paths[0][0] || Equals(i_geom, Geometry(i_line).paths[-1][-1] ) { continue }