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Compare syncGroup shape points list

psill000

Working on a script to compare shapes in syncGroups  and sync the layer color coloring.


It compares the points list from the master to the child's group shape using the points transformed from the parent.
The parent is defined by "par" prefixed to the group name

I know there will not be duplicate elements so simple code is all I need:

forall(mem list1 member(mem list2))

When it runs in the script I get a nil, but If I copy and paste the lists to a variables in the CIW and run the procedure I get a t

Running script and printing the list the value of the lists I see they are the same or one is reversed, but the code should still see they are the same.

The code does see some elements as the same but not all

Is there a rounding problem when I use the dbTransformPoint or is there something I am missing.


Code I have tried to match two lists: (probably some others but it was ugly code)

procedure(cmpPtsList0(list1 list2)
    forall(mem list1 member(mem list2))
)

procedure(cmpPtsList1(list1 list2)
    foreach(mem list1
        list2 = remove(mem list2))
null(list2)
)

procedure(cmpPtsList2(list1 list2)
let(    (x1 x2 y1 y2 list3)
foreach(mem1 list1
    x1    = xCoord(mem1)
    y1    = yCoord(mem1)
    foreach(mem2 list2
        x2    = xCoord(mem2)
        y2    = yCoord(mem2)
        when(equal(x1 x2) && equal(y1 y2)
            list2 = remove(mem1 list2)))
    )
null(list2)
))


procedure(cmpPtsList3(list1 list2)
    equal(list1 list2) || equal(list1 reverse(list2))
 )

procedure(cmpPtsListX(listA listB)
let(    ((contentCount makeTable('counts 0)))
    foreach(elem listA contentCount[elem]=contentCount[elem]+1)
    foreach(elem listB contentCount[elem]=contentCount[elem]-1)
    forall(elem contentCount zerop(contentCount[elem]))
  )
)

Paul

  • I could not guess why it works interactively but not in a procedure call. Some potential issues:

    1. If one of the lists is reversed, it will not be found in the other list. Try:
      or(member(mem list2) member(reverse(mem) list2))
    2. Potential roundoff, where a number after the transform, because it is floating point, is slightly off.
      1. That is harder to detect, you have to parse the points individually and compare the X's and Y's using an "almost" algorithm.
      2. Have it print out those lists it thinks are not matching and see if there is an issue.

    Ted

  • It must have a rounding error.

    When I convert to the float to string to float the elements match.

    procedure(ptToStrToPt(pt)
    let(    (x y)
    sprintf(x "%.3f" xCoord(pt))
    sprintf(y "%.3f" yCoord(pt))
    list(atof(x) atof(y))
    ); end of let
    ); end of ptToStrToPt

    procedure(ptToStrToPtList(ptList)
    let(    (nList)
    foreach(pt ptList
        nList    = cons(ausPSXstdLib_ptToStrToPt(pt) nList))
        xC(nList)
    nList
    ); end of let
    ); end of ptToStrToPtList

    So now this code works:

    forall(mem list1 member(mem list2))

    Paul

  • Even if you print out the values, they may look the same but somewhere, about 16 bits out, there may be a difference. It is not an error but a known problem. Your solution fixed that rounding issue.

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