Allegro X Scripting - Skill - Recent Threads

It Worked the First Time! Why Does My SKILL Code Fail on the Second Run?

JuanCR — Sat, 31 Oct 2026 14:35:49 GMT

Have you ever run a SKILL function successfully, only to find that running it again produces an error or unexpected behaviour?

One common cause is that the first execution changes the database or application state that the code assumes will still be available on the next run. For example, your code may keep references to database objects that have since been deleted, replaced, or modified.

A useful troubleshooting technique is to avoid relying on database object IDs stored globally between executions. Instead, retrieve the objects you need each time the function runs and validate the returned values before operating on them.

For instance:

procedure(processSelectedObject()
let((obj)

obj = car(axlGetSelSet())

    if(obj then
      printf("Current object: %L\n" obj)
      ; Process obj here
    else
      printf("No object is currently selected.\n")
    )
  )
)

This also demonstrates another useful habit: check the result before using it. For example:

obj = car(axlGetSelSet())

when(obj
printf("Selected object type: %L\n" obj->objType)
)

Database objects aren't the only thing to consider. A SKILL script can also change session state such as the current selection or Find Filter. If your function depends on a particular state, the second execution may start under different conditions than the first.

When debugging this kind of problem, try this approach:

Run the function once.
Check what changed in the design or session.
Run it again and identify the first operation that behaves differently.
Add printf() statements around your operations.
Inspect database objects and return values instead of assuming they are valid.
Where appropriate, reacquire database objects rather than relying on references retained from an earlier execution.

These steps are crucial specially when you're testing loose SKILL commands, where moving the canvas, zooming in or modifying the position of the elements might change the dbIDs of the objects.

The important question isn't always "Why did my SKILL code fail?" Sometimes the better question is:

"What did the first execution change that the second execution wasn't expecting?"

That small shift in troubleshooting approach can make intermittent SKILL problems much easier to isolate.

Have you encountered a SKILL function that behaves differently on its second execution? What was the root cause, and how did you track it down?

How to calculate Actual Value in Allegro skill?

SK202607205032 — Tue, 20 Oct 2026 02:21:07 GMT

Hi All,

I am trying to calculate the actual distance between a pin and silkscreen text. Although I am using axlAirGap(), the returned value doesn't match the actual value shown in the DRC.
Instead, it returns 'No Air Gap', which is consistent with the Measure tool's result.
Is there a way to accurately calculate this 'Actual Value'?

Thanks!!

RE: How to calculate Actual Value in Allegro skill?

LF202610219731 — Wed, 21 Oct 2026 15:23:36 GMT

axlAirGap() does not accurately measure silkscreen text. It often measures text using bounding geometry. DRC instead evaluates the actual rendered text strokes.
Cadence recommends creating temporary geometry from the font. Then measure that geometry using axlAirGap().

RE: How to merge excel cell in Allgero SKILL using axlSpreadsheet API

Hoangkhoipcb — Thu, 15 Oct 2026 02:25:38 GMT

Hi SK202607205032

Run the code in test.py without using a .exe file.

import xlsxwriter

workbook = xlsxwriter.Workbook("output.xlsx")

worksheet = workbook.add_worksheet()

worksheet.write("A1", "Hello")

worksheet.write("B1", "World")

worksheet.write("A2", 100)

workbook.close()

type this code in cmd Allegro

skill ipcBeginProcess("python test.py" "" "CallbackFun"); can remove CallbackFun

BR,
HoangKhoi

How to merge excel cell in Allgero SKILL using axlSpreadsheet API

SK202607205032 — Tue, 21 Jul 2026 05:56:35 GMT

I just using axlSpreadsheetInit() to write excel file, but I don't know how to merge cell,example as the picture below.

Is there any suggestion? Thanks a lot.

RE: How to merge excel cell in Allgero SKILL using axlSpreadsheet API

SK202607205032 — Mon, 12 Oct 2026 07:02:24 GMT

Hi HoangKhoi,

I successfully import .json and exported the .xlsx file in Python. However, after converting the Python script into an .exe file and using it within the skill, the export failed(didn't find the .xlsx file). Is there any example?thanks a lot!

RE: Extract areas on the FPCB that do not contain arcs.(Season2)

Renu Vibha — Mon, 05 Oct 2026 10:57:39 GMT

Hi SG20260713408 Thank you very much for sharing the finalized code.

Hoangkhoipcb thank you for sharing your expertise, and commitment to helping others make the community stronger every day!

Extract areas on the FPCB that do not contain arcs.(Season2)

SG20260713408 — Wed, 30 Sep 2026 02:36:21 GMT

Hello, everyone.
I am reposting this with the finalized code,
which builds upon the code shared by "Hoangkhoipcb".
Once again, I would like to thank "Hoangkhoipcb".

Note : Changed on 26Y/10M/16D (;; Change Here)

Enabled execution by layer within APD.

/*
================================================================================

*(26Y/09M/30D)
* Command : create_arc_chk
* Function : Checks for bent corners (sharp angles) without arcs on CLINES.
* Highlights detected segments and generates a report log.
*
* [How to Use]
* 1. Modified to allow checking of individual layers or all layers.
* 2. When the window appears after execution:
* 3. Select the layer you wish to check and click the OK button.
* - All_Layer : Checks clines on all layers.
* - Others : Checks clines only on the specific layer.
* 4. Clicking the Cancel button stops the operation.
*
* Output File : create_arc_chk.log
================================================================================
*/

axlCmdRegister("create_arc_chk" 'create_arc_chk)

(defun create_arc_chk ()
(let (all_layers sel_layer clines seg_list Out_file segs seg next_seg angle pt_corner error_count)

all_layers = append(list("All_Layer") axlSubclassRoute(?field 'isEtch))
sel_layer = nth(axlUIMultipleChoice("Select a Layer" all_layers "All Etch Layer") all_layers)

when(sel_layer
if(sel_layer == "All_Layer" then
axlSetFindFilter(?enabled '("noall" "CLINES" "INVISIBLE") ?onButtons '("all"))
axlAddSelectAll()
clines = axlGetSelSet()
else
axlVisibleDesign(nil)
axlVisibleLayer(strcat(axlMapClassName("ETCH") "/" sel_layer) t) ;; Changed here.
axlVisibleLayer(strcat("PIN/" sel_layer) t)
axlVisibleLayer(strcat("VIA CLASS/" sel_layer) t)
axlVisibleLayer("BOARD GEOMETRY/OUTLINE" t)
axlVisibleUpdate(t)
axlSetFindFilter(?enabled '("noall" "CLINES") ?onButtons '("all"))
axlAddSelectAll()
clines = axlGetSelSet()
)

axlClearSelSet()

seg_list = nil
error_count = 0

Out_file = outfile("create_arc_chk.log" "w")

fprintf(Out_file "%-5s %-7s %-10s %s\n" "No" "Angle" "Layer" "Location")

foreach(cline clines
segs = cline->segments
while(cdr(segs)
seg = car(segs)
next_seg = cadr(segs)

/* Proceed only if both segments are straight lines */
if(seg->xy == nil && next_seg->xy == nil then

/* Find the intersection point of two consecutive line segments */
if(axlGeoPointsEqual(car(seg->startEnd) car(next_seg->startEnd)) || axlGeoPointsEqual(car(seg->startEnd) cadr(next_seg->startEnd)) then
pt_corner = car(seg->startEnd)
else
pt_corner = cadr(seg->startEnd)
)

angle = abs(axlRadToDeg(axlGeoAngleBetweenLines(seg->startEnd next_seg->startEnd)))

if(!axlGeoEqual(angle 0.0) && !axlGeoEqual(angle 180.0) then
error_count = error_count + 1

fprintf(Out_file "%-5d %-7.2f %-10s %L\n" error_count angle cadr(parseString(seg->layer "/")) pt_corner)

seg_list = cons(seg seg_list)
seg_list = cons(next_seg seg_list)
)
)
segs = cdr(segs)
)
)
close(Out_file)

if(error_count > 0 then
axlHighlightObject(seg_list)
axlUIViewFileCreate("create_arc_chk.log" "Arc Segments Check" nil)
printf("### Errors : %d ###\n" error_count)
else
printf("### No arc-less corners found. ###\n")
)
)
)
)

SKILL: "Error if: too many arguments (missing then?)" error on running "if" command

JuanCR — Mon, 28 Sep 2026 10:08:01 GMT

Check out the following statement:

if( order
parameters = foreach( mapcar param order (get cdfgData param))
parameters = (getq cdfgData parameters)
)

It seems a then keyword is missing, and the tool does not complain.

Now let's say you add a printf command like:

if( order
parameters = foreach( mapcar param order (get cdfgData param))
parameters = (getq cdfgData parameters)
printf("%L" parameters~>values)
)

In this case, you'll get the following error:

*Error* if: too many arguments (missing then?) -
(order (parameters = foreach(mapcar param order get(cdfgData param)))
(parameters = (cdfgData->parameters)) printf("%L" (parameters~>values)))

Why did you get this error, and how can you fix it? I'll show you:

Consider a simpler example. In the command line, type:

x = 2

Then enter this expression:

if( (x > 5) 1 0)

The tool will evaluate whether x > 5; if so, a "1" will be returned; otherwise, a "0" will be returned. Since 2 is less than 5, you will see the returned value as follows:

=> 0

This is because the "if" command falls into the following syntax:

if( g_condition g_thenExpression [ g_elseExpression ] )

Now, if a fourth argument is added ("3" in this case) as follows:

if( (x > 5) 1 0 3)

You will now see the following error:

*Error* if: too many arguments (missing then?) - ((x > 5) 1 0 3)

You get it because the 'compact' form of the if command is no longer applied. The syntax now becomes:

if( g_condition then g_thenExpr1 ... [ else g_elseExpr1 ... ] )

Thus, you need to add a "then" for a complete "if" command. If it is not present, the tool will generate an error message.

It is recommended to use the "then" and "else" keywords to avoid such syntax errors and reduce confusion. There are times when the 'compact' form is handy without the bloat of then...else, but it is generally recommended to add these keywords.

Check the SKILL Language Reference for details. Here's an excerpt from the input for the if conditional:

Description

This command selectively evaluates two groups of one or more expressions. The syntax is as follows:

if( g_condition g_thenExpression [ g_elseExpression ] )
=> g_result

The "if" form evaluates g_condition, typically a relational expression, and executes g_thenExpression if the condition is true (that is, its value is non-nil); otherwise, g_elseExpression is executed. The value returned by "if" is the value of the corresponding expression evaluated. The "if" form can therefore be used to evaluate expressions conditionally.

if( g_condition then g_thenExpr1 ... [ else g_elseExpr1 ... ] )
=> g_result

The second form of "if" uses the keywords "then" and "else" to group expressions into a conditional execution sequence. If the condition is true, the sequence of expressions between "then" and "else" (or the end of the if form) is evaluated, with the value of the last expression evaluated returned as the value of the form. If the condition is nil instead, the sequence of expressions following the "else" keyword (if any) is evaluated instead. Again, the value of the last expression evaluated is returned as the value of the form.

RE: SKILL: "Error if: too many arguments (missing then?)" error on running "if" command

JuanCR — Tue, 29 Sep 2026 17:08:56 GMT

Hi David,

Yes, this "if" statement is correct. You're following the syntax "if( g_condition g_thenExpression [ g_elseExpression ] )"

See above, in the post. If you replace the contents of the "if" by this:

[quote userid="524126" url="~/cadence_technology_forums/pcb-design/f/allegro-x-scripting-skill/70342/skill-error-if-too-many-arguments-missing-then-error-on-running-if-command"]if( order
parameters = foreach( mapcar param order (get cdfgData param))
parameters = (getq cdfgData parameters)
printf("%L" parameters~>values)
)[/quote]

then you'll see that sklint will flag the error.

RE: SKILL: "Error if: too many arguments (missing then?)" error on running "if" command

DavidJHutchins — Tue, 29 Sep 2026 15:48:06 GMT

below is the 'if_test' procedure I added as a test:

C:\Users\davidh\Documents>cat -n test.il | tail
42 )
43 procedure(if_test()
44 let((parameters param)
45 if( order
46 parameters = foreach( mapcar param order (get cdfgData param))
47 parameters = (getq cdfgData parameters)
48 )
49 )
50 )
51

C:\Users\davidh\Documents>il_allegro
> sklint(?file "test.il")
Loading skillLint.cxt
INFO (LoadFile): Loading file C:\Cadence\SPB_23.1\tools\sklint/rules/allegro_sklint.il...
INFO (LoadFile): Loading file C:\Cadence\SPB_23.1\tools\sklint/rules/hi2ipc.il...
INFO (LoadFile): Loading file C:\Cadence\SPB_23.1\tools\sklint/rules/ignore.il...
INFO (LoadFile): Loading file C:\Cadence\SPB_23.1\tools\sklint/rules/ilMig.il...
INFO (REP008): Program SKILL Lint started on Sep 29 08:43:09 2026.
INFO (PREFIXES): Using prefixes: "none"
INFO (STRICT): Using strict checking of global variables.
SUGGEST (REMOVE1): test.il, line 23 (PadStackUsage) : Consider use of remq rather than remove: remove(name PadTable)
HINT (NTH1): test.il, line 35 (parse_test) : Can replace call to nth with call to caddr: nth(2 parseString(param_line "<>"))
UNUSED VAR (Unused): test.il, line 44 (if_test) : variable param does not appear to be referenced.
UNUSED VAR (Unused): test.il, line 44 (if_test) : variable parameters does not appear to be referenced. (assigned only)
INFO (VAR5): Unrecognized global variables:
WARN GLOB (VAR8): cdfgData
INFO (VAR): used: in function if_test from file test.il, lines (47 46)
WARN GLOB (VAR8): order
INFO (VAR): used: in function if_test from file test.il, lines (46 45)
INFO (IQ): IQ score is 74 (best is 100).
INFO (IQ1): IQ score is based on 0 error messages, 4 general warning messages, and 3 top level forms.
INFO (REP110): Total enhancement : 0.
INFO (REP110): Total external global : 0.
INFO (REP110): Total package global : 0.
INFO (REP110): Total warning global : 2.
INFO (REP110): Total error global : 0.
INFO (REP110): Total unused vars : 2.
INFO (REP110): Total next release : 0.
INFO (REP110): Total alert : 0.
INFO (REP110): Total hint : 1.
INFO (REP110): Total suggestion : 1.
INFO (REP110): Total internal alert : 0.
INFO (REP110): Total information : 19.
INFO (REP110): Total warning : 0.
INFO (REP110): Total error : 0.
INFO (REP110): Total internal error : 0.
INFO (REP110): Total fatal error : 0.
INFO (REP009): Program SKILL Lint finished on Sep 29 08:43:09 2026 with status PASS.
t

no error reported...

RE: SKILL: "Error if: too many arguments (missing then?)" error on running "if" command

JuanCR — Tue, 29 Sep 2026 14:11:31 GMT

Hi David. I've tested this in sklint and it does report it. Where have you seen this not reported by it?

For instance, I created a file with the example above if( (x > 5) 1 0 3) and when I run sklint I get this in the output file:

NFO (STRICT): Using strict checking of global variables.

ERROR (IF4): if.il, line 1 (abc) : 'then' and 'else' required in 'if' construct: if((x > 5) 1 0 ...)

If you're getting a different result, let me know.

RE: SKILL: "Error if: too many arguments (missing then?)" error on running "if" command

DavidJHutchins — Mon, 28 Sep 2026 23:09:31 GMT

Why doesn't the sklint tool report these issues?

RE: Extract areas on the FPCB that do not contain arcs.

Hoangkhoipcb — Sun, 27 Sep 2026 07:46:36 GMT

Thank you! I completely agree.

Extract areas on the FPCB that do not contain arcs.

SG20260713408 — Sat, 19 Sep 2026 04:48:27 GMT

When designing an FPCB (Flexible Printed Circuit Board), corners are often rounded using arcs.

This script extracts the coordinates of connection points between cline segments where no arc has been generated.
In other words, assuming that all corners should be rounded with arcs, it identifies the locations where arcs are missing.
Therefore, you can verify the design by running the test after applying arcs to all corners.

GoodBye~~

axlCmdRegister("find_napoc" 'Find_No_Arc_Point_Of_Clines ?cmdType "interactive")

procedure(Find_No_Arc_Point_Of_Clines()

let((theta_lists check_list check_lists cline_seg_count all_cline_seg_count
sel_nets sel_net_name sel_net_branches sel_net_branches_childrens pin_via_dbs cline_dbs
cline_db_segments first_seg_in_pin_via_value layer first_startend
first_start_xy first_end_xy first_find_pin_via_db first_find_pin_via_db_poly first_start_xy_in_db_result first_end_xy_in_db_result
last_startend last_start_xy last_end_xy last_find_pin_via_db last_find_pin_via_db_poly
segment_objtype segment_layer segment_start_end_xy segment_start_xy segment_start_x segment_start_y
segment_end_xy segment_end_x segment_end_y delta_x delta_y
theta theta_lists seg_start_xy_in_first_db_result seg_start_xy_in_last_db_result)

theta_lists = list(nil)

check_lists = list()

axlClearSelSet()

sel_nets = axlDBGetDesign() -> nets

foreach(sel_net sel_nets

sel_net_name = sel_net -> name

sel_net_branches = sel_net -> branches

when(sel_net_branches

foreach(sel_net_branche sel_net_branches

sel_net_branches_childrens = sel_net_branche -> children

pin_via_dbs = setof(db sel_net_branches_childrens db -> objType == "pin" || db -> objType == "via")

cline_dbs = setof(db sel_net_branches_childrens db -> objType == "path")

when(cline_dbs

foreach(cline_db cline_dbs

cline_db_segments = cline_db -> segments

when(cline_db_segments

cline_db_segments_length = length(cline_db_segments)

cline_seg_count = 0

all_cline_seg_count = 0

first_seg_in_pin_via_value = nil

layer = car(cline_db_segments) -> layer

first_startend = car(cline_db_segments) -> startEnd

first_start_xy = car(first_startend)

first_end_xy = cadr(first_startend)

first_find_pin_via_db = car(setof(db pin_via_dbs axlGeoPointsEqual(db -> xy first_start_xy)))

if(first_find_pin_via_db then

first_find_pin_via_db_poly = car(axlPolyFromDB(first_find_pin_via_db ?layer layer ?padType 'REGULAR))

first_start_xy_in_db_result = axlGeoPointInShape(first_start_xy first_find_pin_via_db_poly)

first_end_xy_in_db_result = axlGeoPointInShape(first_end_xy first_find_pin_via_db_poly)

when(first_start_xy_in_db_result && first_end_xy_in_db_result first_seg_in_pin_via_value = t)

else

first_find_pin_via_db_poly = nil

first_seg_in_pin_via_value = nil

)

last_startend = lastelem(cline_db_segments) -> startEnd

last_start_xy = car(last_startend)

last_end_xy = cadr(last_startend)

last_find_pin_via_db = car(setof(db pin_via_dbs axlGeoPointsEqual(db -> xy last_end_xy)))

if(last_find_pin_via_db then

last_find_pin_via_db_poly = car(axlPolyFromDB(last_find_pin_via_db ?layer layer ?padType 'REGULAR))

else

last_find_pin_via_db_poly = nil

)

foreach(segment cline_db_segments

cline_seg_count = ++cline_seg_count

all_cline_seg_count = ++all_cline_seg_count

segment_objtype = segment -> objType

segment_layer = cadr(parseString(segment -> layer "/"))

segment_start_end_xy = segment -> startEnd

segment_start_xy = car(segment_start_end_xy)

segment_start_x = car(segment_start_xy)

segment_start_y = cadr(segment_start_xy)

segment_end_xy = cadr(segment_start_end_xy)

segment_end_x = car(segment_end_xy)

segment_end_y = cadr(segment_end_xy)

delta_x = segment_start_x - segment_end_x

delta_y = segment_start_y - segment_end_y

if(oddp(cline_seg_count) then

theta = axlRadToDeg(atan2(delta_y delta_x))

theta_lists = cons(theta theta_lists)

when(all_cline_seg_count == 1 && first_seg_in_pin_via_value cline_seg_count = 1)

when(segment_objtype == "arc" cline_seg_count = 0)

)

if(zerop(cline_seg_count) && evenp(cline_seg_count) then

theta = axlRadToDeg(atan2(delta_y delta_x))

theta_lists = cons(theta theta_lists)

else

when(!zerop(cline_seg_count) && evenp(cline_seg_count)

seg_start_xy_in_first_db_result = axlGeoPointInShape(segment_start_xy first_find_pin_via_db_poly)

;;seg_end_xy_in_first_db_result = axlGeoPointInShape(segment_end_xy first_find_pin_via_db_poly)

seg_start_xy_in_last_db_result = axlGeoPointInShape(segment_start_xy last_find_pin_via_db_poly)

;;seg_end_xy_in_last_db_result = axlGeoPointInShape(segment_end_xy last_find_pin_via_db_poly)

before_theta = car(theta_lists)

if(segment_objtype != "arc" then

theta = axlRadToDeg(atan2(delta_y delta_x))

if(axlGeoEqual(before_theta theta) then

cline_seg_count = 1

theta_lists = cons(theta theta_lists)

else

if(seg_start_xy_in_first_db_result || seg_start_xy_in_last_db_result then

cline_seg_count = 1

theta_lists = cons(theta theta_lists)

else

check_list = list(segment_layer segment_start_xy sel_net_name)

check_lists = cons(check_list check_lists)

cline_seg_count = 1

theta_lists = cons(theta theta_lists)

)

else

cline_seg_count = 0

)

theta_lists = list(car(theta_lists))

)

check_lists = sortcar(check_lists 'axlStrcmpAlpNum)

if(zerop(length(check_lists)) then

;;printf("### Error Count = 0 ###\n")

axlUIConfirm("Error Count Zero(0)" 'info)

else

Create_Find_No_Arc_Point_Of_Clines_log_File(check_lists)

)

procedure(Create_Find_No_Arc_Point_Of_Clines_log_File(checking_result_infor_lists)

let((total_all_error_count Date)

total_all_error_count = 0
Date = (getCurrentTime)
Date = parseString(Date " ")
Date = strcat(nth(3 Date) " " nth(0 Date) " " nth(1 Date) " " nth(2 Date))

Find_No_Arc_Point_Of_Clines_Log_File = outfile("./Find_No_Arc_Point_Of_Clines.log" "w")

fprintf(Find_No_Arc_Point_Of_Clines_Log_File "\nDATE : %s\n" Date)

fprintf(Find_No_Arc_Point_Of_Clines_Log_File "\nSyntax : Layer, Point_XY, Net_Name\n")

fprintf(Find_No_Arc_Point_Of_Clines_Log_File "\n=========================================================================\n")

fprintf(Find_No_Arc_Point_Of_Clines_Log_File "\n ## REPORT OF NO ARC BETWEEN TWO CLINE SEGS ##\n\n")

foreach(checking_result_infor_list checking_result_infor_lists

total_all_error_count = ++total_all_error_count

fprintf(Find_No_Arc_Point_Of_Clines_Log_File "%d.%s, %L, %s\n" total_all_error_count car(checking_result_infor_list) cadr(checking_result_infor_list) caddr(checking_result_infor_list))

)

fprintf(Find_No_Arc_Point_Of_Clines_Log_File "\n=========================================================================\n\n")

fprintf(Find_No_Arc_Point_Of_Clines_Log_File "Total Error Count = %d ea.\n" total_all_error_count)

close(Find_No_Arc_Point_Of_Clines_Log_File)

axlShell("viewlog ./Find_No_Arc_Point_Of_Clines.log")

)

RE: Extract areas on the FPCB that do not contain arcs.

SG20260713408 — Sun, 27 Sep 2026 01:53:09 GMT

Hi Hoangkhoipcb

I think other users might need your feature, so I am uploading the modified code.

However, the UI window is small.

Thank you.

1. Modified to allow checking of individual layers or all layers.
2. When the window appears after execution:
3. Select the layer you wish to check and click the OK button.
- All_Layer : Checks clines on all layers.
- Etc : Checks clines only on the specific layer.
4. Clicking the Cancel button stops the operation.

axlCmdRegister("create_arc_chk" 'create_arc_chk)
(defun create_arc_chk ()
(let ()
prog(()

all_layers = append(list("All_Layer") axlSubclassRoute(?field 'isEtch))
sel_layer = nth(axlUIMultipleChoice("Select a Layer" all_layers "All Etch Layer") all_layers)

when(sel_layer

if(sel_layer == "All_Layer" then
axlSetFindFilter(?enabled '("noall" "CLINES" "INVISIBLE") ?onButtons '("all"))
axlAddSelectAll()
clines = axlGetSelSet()

else
axlVisibleDesign(nil)
axlVisibleLayer(strcat("ETCH/" sel_layer) t)
axlVisibleLayer(strcat("PIN/" sel_layer) t)
axlVisibleLayer(strcat("VIA CLASS/" sel_layer) t)
axlVisibleLayer("BOARD GEOMETRY/OUTLINE" t)
axlVisibleUpdate(t)

axlSetFindFilter(?enabled '("noall" "CLINES") ?onButtons '("all"))
axlAddSelectAll()
clines = axlGetSelSet()

) ;;if sel_layer

axlClearSelSet()
tmp_list = nil
seg_list = nil
Out_file = outfile("create_arc_chk.log" "w")
fprintf(Out_file "%-5s %-7s %-10s %s\n" "No" "Angle" "Layer" "Location" )
foreach(cline clines
segs = cline->segments
foreach(seg segs
if(length(member(seg segs)) > 1 then
next_seg = cadr(member(seg segs))
if(seg->xy == nil && next_seg->xy == nil then
ol = axl_ol_ol2(seg->startEnd next_seg->startEnd)
if(member(car(ol) tmp_list) == nil then
angle = abs(axlRadToDeg(axlGeoAngleBetweenLines(seg->startEnd next_seg->startEnd)))
if(axlGeoEqual(angle 0.0) || axlGeoEqual(angle 180.0) then
else
push(car(ol) tmp_list)
fprintf(Out_file "%-5d %-7.2f %-10s %L\n" length(tmp_list) angle cadr(parseString(seg->layer "/")) car(ol) )
push(seg seg_list)
push(next_seg seg_list)
)
)
)
)
)
)
close(Out_file)
if(length(tmp_list) > 0 then
axlHighlightObject(seg_list)
axlUIViewFileCreate("create_arc_chk.log" "Arc Segments Check" nil)
printf("Errors : %d\n" length(tmp_list))
)
)
)
)
)

RE: Extract areas on the FPCB that do not contain arcs.

Hoangkhoipcb — Sat, 26 Sep 2026 08:08:37 GMT

Hi SG,

RE: Extract areas on the FPCB that do not contain arcs.

Hoangkhoipcb — Sat, 26 Sep 2026 07:48:08 GMT

Hi SG,

Thank you very much for your thoughtful feedback! I really appreciate your comments.

I use prog mainly out of habit. When validating multiple input parameters, I prefer to exit immediately if something is invalid.
Exception handling depends on the design requirements. In my case, I intentionally don't allow those cases to be skipped.
This SKILL was written quickly to check a design with around 50,000 clines on a single layer, so I allow the user to select the layer to process and saved time .
I agree with you about separating functions. I would also suggest keeping the code as clear and concise as possible, including using shorter and more meaningful variable names where appropriate. This can make the code easier to read, review, and maintain.

I hope you continue improving your SKILL development skills in future.

If you'd like to contact me, hoangkhoipcb_@_gmail_com

BR.

HoangKhoi

RE: Extract areas on the FPCB that do not contain arcs.

SG20260713408 — Fri, 25 Sep 2026 13:13:08 GMT

Thanks, Hoangkhoipcb!
I appreciate you sharing such concise code.
I’m still studying to fully understand it,
but I’ll take your code to heart; it will certainly help me think about writing code more concisely or elegantly.
I’d love to ask for your email address,
but given the nature of this community, I feel it’s not the right place for private conversations.
I may lack expertise myself, but I notice that
high-level script developers aren't providing answers here.

Here are my personal thoughts on the code:

1. I’m not sure why the "prog" function was used.

2. There is no exception handling.
- If a cline segment (or cline) is connected to a via, pin, or shape, there is no need to extract the point.

3. The order of the results was determined for the sake of the next step.
- The angle of the result doesn't matter; the designer just needs to be able to verify the result.
(Though it would be useful for debugging purposes.)
- If layers are mixed, unnecessary screen control operations are repeated.

4. When I was a beginner, I used to put every function into a single block,
but as the code grew longer, it became difficult to review or maintain, so I separated the log file generation.
Ultimately, I decided to create separate functions for each specific task.

thank you~~

RE: Extract areas on the FPCB that do not contain arcs.

Hoangkhoipcb — Fri, 25 Sep 2026 04:36:42 GMT

Hi SG20260713408,

I tested your code, and it works well for me.
I've made a shorter version of the code for you to reference.

axlCmdRegister("create_arc_chk" 'create_arc_chk)

(defun create_arc_chk ()

(let ()

prog(()

axlSetFindFilter(?enabled '("noall" "CLINES" "INVISIBLE") ?onButtons '("all"))

axlAddSelectAll()

clines = axlGetSelSet()

axlClearSelSet()

tmp_list = nil

seg_list = nil

Out_file = outfile("create_arc_chk.log" "w")

fprintf(Out_file "%-5s %-7s %-10s %s\n" "No" "Angle" "Layer" "Location" )

foreach(cline clines

segs = cline->segments

foreach(seg segs

if(length(member(seg segs)) > 1 then

next_seg = cadr(member(seg segs))

if(seg->xy == nil && next_seg->xy == nil then

ol = axl_ol_ol2(seg->startEnd next_seg->startEnd)

if(member(car(ol) tmp_list) == nil then

angle = abs(axlRadToDeg(axlGeoAngleBetweenLines(seg->startEnd next_seg->startEnd)))

if(axlGeoEqual(angle 0.0) || axlGeoEqual(angle 180.0) then

else

push(car(ol) tmp_list)

fprintf(Out_file "%-5d %-7.2f %-10s %L\n" length(tmp_list) angle cadr(parseString(seg->layer "/")) car(ol) )

push(seg seg_list)

push(next_seg seg_list)

)

close(Out_file)

if(length(tmp_list) > 0 then

axlHighlightObject(seg_list)

axlUIViewFileCreate("create_arc_chk.log" "Arc Segments Check" nil)

printf("Errors : %d\n" length(tmp_list))

)

BR,

HoangKhoi

RE: Extract areas on the FPCB that do not contain arcs.

SG20260713408 — Tue, 22 Sep 2026 04:26:05 GMT

I apologize.
When designing an FPCB (Flexible Printed Circuit Board), corners are often rounded using arcs.
This script extracts the coordinates of connection points between cline segments where no arc has been generated.
In other words, assuming that all corners should be rounded with arcs, it identifies the locations where arcs are missing.
Therefore, you can verify the design by running the test after applying arcs to all corners.

thank you

RE: Extract areas on the FPCB that do not contain arcs.

Elecguy — Tue, 22 Sep 2026 02:26:42 GMT

Interesting. But with no comments, no header, no instructions for the type of database it works on ... difficult to test

RE: Extraction of RLC Values for Cline using skill

Elecguy — Thu, 17 Sep 2026 23:48:47 GMT

I don't think there's a dedicated API for this. But you can certainly read properties of the database and/or cline and manually make calculations.

Extraction of RLC Values for Cline using skill

ABIKRISHNA — Wed, 16 Sep 2026 12:26:31 GMT

Is it possible to extract or calculate the following parameters for a selected cline using Allegro SKILL code?

Resistance
Inductance
Capacitance

Could you please provide some guidance on the relevant SKILL APIs or approach?

Skill to open Custom Variables Window in Allegro x 25.1 PCB Editor

MZ20250602835 — Wed, 19 Aug 2026 12:40:07 GMT

Dear all,

i can use Command tbx customvar update to open the custom variables window.

I can also use axlShell("tbx customvar update") to open the same window but My current Problem is that:

after giving axlShell("tbx customvar update") I do not get the Skill > for the next skill

Skill > axlShell("tbx customvar update")

Reading file "C:/Users/emp8124501/ECAD/projects/251_demo/output/251_demo/physical/customvar.cfg"

Info: Reading custom variables from "C:/Users/emp8124501/ECAD/projects/251_demo/251_demo.cpm"

It missing the Skill > after Info: Reading custom variables from "C:/Users/emp8124501/ECAD/projects/251_demo/251_demo.cpm"

May i ask how could i solve this issue or are there any other skill to use instead of axlShell in allegro x pcb editor such as axlCmd, axlUIWExecuteCommand or axlDBCmd?

Many thanks

Moyan

Allegro X Scripting - Skill - Recent Threads

It Worked the First Time! Why Does My SKILL Code Fail on the Second Run?

How to calculate Actual Value in Allegro skill?

RE: How to calculate Actual Value in Allegro skill?

RE: How to merge excel cell in Allgero SKILL using axlSpreadsheet API

How to merge excel cell in Allgero SKILL using axlSpreadsheet API

RE: How to merge excel cell in Allgero SKILL using axlSpreadsheet API

RE: Extract areas on the FPCB that do not contain arcs.(Season2)

Extract areas on the FPCB that do not contain arcs.(Season2)

SKILL: "*Error* if: too many arguments (missing then?)" error on running "if" command

RE: SKILL: "*Error* if: too many arguments (missing then?)" error on running "if" command

RE: SKILL: "*Error* if: too many arguments (missing then?)" error on running "if" command

RE: SKILL: "*Error* if: too many arguments (missing then?)" error on running "if" command

RE: SKILL: "*Error* if: too many arguments (missing then?)" error on running "if" command

RE: Extract areas on the FPCB that do not contain arcs.

Extract areas on the FPCB that do not contain arcs.

RE: Extract areas on the FPCB that do not contain arcs.

RE: Extract areas on the FPCB that do not contain arcs.

RE: Extract areas on the FPCB that do not contain arcs.

RE: Extract areas on the FPCB that do not contain arcs.

RE: Extract areas on the FPCB that do not contain arcs.

RE: Extract areas on the FPCB that do not contain arcs.

RE: Extract areas on the FPCB that do not contain arcs.

RE: Extraction of RLC Values for Cline using skill

Extraction of RLC Values for Cline using skill

Skill to open Custom Variables Window in Allegro x 25.1 PCB Editor

SKILL: "Error if: too many arguments (missing then?)" error on running "if" command

RE: SKILL: "Error if: too many arguments (missing then?)" error on running "if" command

RE: SKILL: "Error if: too many arguments (missing then?)" error on running "if" command

RE: SKILL: "Error if: too many arguments (missing then?)" error on running "if" command

RE: SKILL: "Error if: too many arguments (missing then?)" error on running "if" command