Calculation rule for line cutting

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05-03-2022 01:35 PM
HNTZK46
New Contributor III

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!

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3 Replies
JohannesLindner
MVP Frequent Contributor

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
        }
    ]
}

Have a great day!
Johannes
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HNTZK46
New Contributor III

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.

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JohannesLindner
MVP Frequent Contributor

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
    }

Have a great day!
Johannes
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