I am testing attribute rules and geometry. I am able to change line geometry using paths but curves do not appear to work. Both are "valid expressions". (I am using ArcGIS Pro 2.6 Patch 3 on a geodatabase)
Adds a vertex offset from the line (works)
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var paths = geometry($feature).paths
var first_point = paths[0][0]
var last_point = paths[0][Count(paths[0])-1]
var x1 = first_point.x
var y1 = first_point.y
var x2 = last_point.x
var y2 = last_point.y
var xc = (x1 + x2) / 2
var yc = y1
var newline = PolyLine({"paths": [ [[x1,y1],[xc,yc],[x2,y2]]],"spatialReference": Geometry($feature).spatialReference});
return newline;
------------------ Curve Not Working - same coordinate pairs as above ---------------------
var paths = geometry($feature).paths
var first_point = paths[0][0]
var last_point = paths[0][Count(paths[0])-1]
var x1 = first_point.x
var y1 = first_point.y
var x2 = last_point.x
var y2 = last_point.y
var xc = (x1 + x2) / 2
var yc = y1
var newline = polyline(Geometry({"curvePaths": [[[x1,y1], {"c": [[xc,yc],[x2,y2]]} ]],"spatialReference": Geometry($feature).spatialReference }))
return newline;
