topic Re: Object resize by A or B parameter in GDL

Object resize by A or B parameter

MitchD — Thu, 19 Jun 2025 05:38:40 GMT

I have a very simple script for a 2D object that creates a box with minimum dimension 1m, and total area of 3m².

it functions fine except it only seems to accept changes to the A parameter, where ideally i want both A and B to be defined (mainly so you can adjust any hotspot)

the parameters section is as below.

IF A < 1.0 THEN A = 1.0 PARAMETERS A = A IF B < 1.0 THEN B = 1.0 PARAMETERS B = B PARAMETERS B = 3/A

i've even tried changing the code to this, but didn't affect anything.

IF a < 1.0 then a = 1.0 IF b < 1.0 then b = 1.0 if glob_modpar_name = "a" then b = a / 3 parameters b = b endif if glob_modpar_name = "b" then a = b / 3 parameters a = a endif

is there a more suitable code to allow either parameters to resize the object?

Re: Object resize by A or B parameter

BrunoH — Sat, 21 Jun 2025 17:25:46 GMT

Hi,

Try this,

if glob_modpar_name = "A" then if A < 1.0 then A = 1.0 if A > 3.0 then A = 3.0 ! Area should be 3m2 so A should be < 3 B = 3.0 / A ! Calculate value of B goto 1: endif if glob_modpar_name = "B" then if B < 1.0 then B = 1.0 if B > 3.0 then B = 3.0! Area should be 3m2 so B should be < 3 A = 3.0 / B ! Calculate value of A endif 1: parameters A = A , B = B ! Set the values of A and B

Re: Object resize by A or B parameter

Barry Kelly — Thu, 19 Jun 2025 09:09:31 GMT

Try this.

VALUES "A" RANGE [1.0,] VALUES "B" RANGE [1.0,] if GLOB_MODPAR_NAME = "A" then B = 3.0/A if B < 1.0 then B = 1.0 A = 3.0 endif endif if GLOB_MODPAR_NAME = "B" then A = 3.0/B if A < 1.0 then A = 1.0 B = 3.0 endif endif PARAMETERS A = A, B = B

Barry.

Re: Object resize by A or B parameter

Lingwisyer — Fri, 20 Jun 2025 01:36:43 GMT

Cap the ranges to 3 given the set area with min dimension.

Re: Object resize by A or B parameter

Barry Kelly — Fri, 20 Jun 2025 01:47:49 GMT

Yes, you could do that as well seeing as the maximum size would be 3m.

Then it could be simply ...

VALUES "A" RANGE [1.0,3.0] VALUES "B" RANGE [1.0,3.0] if GLOB_MODPAR_NAME = "A" then B = 3.0/A endif if GLOB_MODPAR_NAME = "B" then A = 3.0/B endif PARAMETERS A = A, B = B

You could also create a parameter for the area, if you want an adjustable maximum area.

Then just place that parameter everywhere you see 3.0

Barry.

Re: Object resize by A or B parameter

MitchD — Sun, 22 Jun 2025 23:38:23 GMT

Fantastic! thank you both very much.

The range with extra parameters for set area and minimum dimension would resolve a couple of objects for me.