topic Re: Return a modified geometry in ArcGIS Arcade Questions

Return a modified geometry

RPGIS — Wed, 09 Apr 2025 19:46:47 GMT

Hi,

I am having trouble with the arcade script below being used in an attribute rule that is designed to adjust the building footprints using the code below. It validates, but when it runs, the vertices do not change and I am not sure how to return the modified geometry.

The script below primarily works with rectilinear polygons, and it will be modified later to check and update each segment so that all segments that it enforces collinear and parallel lines.

I have tried several things to modify the existing geometry but still no luck. I did it before but now I cannot seem to remember how exactly I did it.

Re: Return a modified geometry

VictorGutzler — Tue, 08 Apr 2025 13:59:12 GMT

I do not see any difference between the then and else clauses in the GetThirdVertex function. Is this intentional?

function GetThirdVertex(NPoint, a, m, d){
var np = Dictionary( NPoint )
//console( np )
// Solve for possible x2 and y2 coordinates
var deltaX = d / sqrt(1 + pow(m,2))
var deltaY = m * deltaX

// Compute the two possible vertices
if( a > 0 && a < 180 ){
np.x = np.x + deltaX
np.y = np.y + deltaY
}
else{
np.x = np.x + deltaX
np.y = np.y + deltaY
}
//console( np )
// Return an array containing the two possible vertices
return Point( np )
}

Re: Return a modified geometry

RPGIS — Tue, 08 Apr 2025 15:05:19 GMT

The difference is to determine whether the segment is angled upwards or downwards.

Re: Return a modified geometry

VictorGutzler — Tue, 08 Apr 2025 15:30:34 GMT

I do not see any difference between the then and else clauses in the FindThirdVertex function. Is this intentional?

function GetThirdVertex(NPoint, a, m, d){

var np = Dictionary( NPoint )

//console( np )

// Solve for possible x2 and y2 coordinates

var deltaX = d / sqrt(1 + pow(m,2))

var deltaY = m * deltaX

// Compute the two possible vertices

if( a > 0 && a < 180 ){

np.x = np.x + deltaX

np.y = np.y + deltaY

}

else{

np.x = np.x + deltaX

np.y = np.y + deltaY

}

//console( np )

// Return an array containing the two possible vertices

return Point( np )

}

Re: Return a modified geometry

RPGIS — Tue, 08 Apr 2025 17:35:00 GMT

Sorry, it's a typo on my part. It should be subtracting rather than adding for the if else statement.