QCAD.org Forum

Posted: **Tue Dec 16, 2025 5:10 pm**

Hi all,

i got a problem when opening some older DXF with qcad or convert them with dwg2dwg
when i open the same file with E-Drawings everything does well, sadly i am not allowed to upload my companys file but i can upload a specific code from the file e.g. whats supposed to be measurement 143 ( second from left )

Version: 3.28.1.0 (3.28.1) on Win 11 x64

part one ~ line 7814 to 8001

Code: Select all

*D26
 70
     1
 10
0.0
 20
0.0
 30
0.0
  3
*D26
  0
LINE
  8
0
  6
CONTINUOUS
 62
   100
 10
-73.067963
 20
-57.216466
 30
0.0
 11
-73.067966
 21
-0.000003
 31
0.0
  0
LINE
  8
0
  6
CONTINUOUS
 62
   100
 10
-73.651475
 20
-54.406206
 30
0.0
 11
-73.067963
 21
-57.216466
 31
0.0
  0
LINE
  8
0
  6
CONTINUOUS
 62
   100
 10
-73.067963
 20
-57.216466
 30
0.0
 11
-72.484452
 21
-54.406206
 31
0.0
  0
LINE
  8
0
  6
CONTINUOUS
 62
   100
 10
-72.484454
 20
-2.810263
 30
0.0
 11
-73.067966
 21
-0.000003
 31
0.0
  0
LINE
  8
0
  6
CONTINUOUS
 62
   100
 10
-73.067966
 20
-0.000003
 30
0.0
 11
-73.651477
 21
-2.810263
 31
0.0
  0
LINE
  8
0
  6
CONTINUOUS
 62
   100
 10
-29.478731
 20
-57.216464
 30
0.0
 11
-74.067963
 21
-57.216466
 31
0.0
  0
LINE
  8
0
  6
CONTINUOUS
 62
   100
 10
0.0
 20
0.0
 30
0.0
 11
-74.067966
 21
-0.000003
 31
0.0
  0
TEXT
  8
0
  6
CONTINUOUS
 62
   100
 10
-73.717964
 20
-32.108232
 30
0.0
 40
3.5
  1
143
 50
90.0
 41
0.714286
  7
MICROCADAM
  0
ENDBLK
  8
0
  0
BLOCK
  8
0
  6
CONTINUOUS
 62
   100
  2

part two ~ line 11096 to 11138

Code: Select all

*D26
 10
-73.067963
 20
-57.216466
 30
0.0
 11
-73.067964
 21
-28.608232
 31
0.0
 70
     1
  1
143
 13
0.0
 23
0.0
 33
0.0
 14
-29.478731
 24
-57.216464
 34
0.0
 50
62.741504
  3
STANDARD
  0
DIMENSION
  8
0
  6
CONTINUOUS
 62
   100
  2

from what i already found out when checking the dxf reference book

the value below 70 states the type of measurement

the value below 50 on snippet 1 : 90 on snippet 2 : 62.741504 indicates the angle

only thing i do not know is how to make QCAD omint the second one with the faulty measurement, or disregards it when using converter tools

Posted: **Tue Dec 16, 2025 5:42 pm**

Hi,

It seems to concern Aligned Dimensions.
What is older? What does the Command History tells you when loaded in the GUI?
What is the full dwg2dwg command line instruction?

Aligned means parallel in regards with measurement point to measurement point.
Not necessarily limited to in X or in Y.

I would expect Rotated, BaseLine or Ordinate dimensions here.
Horizontal or Vertical are Rotated dimensions at a specific angle.

Strangely enough: The measured values are the same ...

Without a sample drawing, it's just guesswork.
These must not be complete drawings.
You can also attach a proprietary drawing to a private message.
This will be treated with the utmost confidentiality.
Before and after conversion would be nice.

Regards,
CVH

Posted: **Tue Dec 16, 2025 6:29 pm**

Hi CVH,

thank you for your support.
the screenshot shows the same file, opend at the same moment, the instant i open it on QCAD i looks like this. the file has not been modified by be.

Opening it in Solidworks , wich is drag, also shows the file displaying well. Later @home i can check on Atom3d

i used the conversion tools to convert ~ 15k files for the PDF printing system, printing out drawings automatically when the part gets produced.
some files turned our like this, while the most are doing well. i will put down the command i used when i return to the second computer.

i added an other screenshot, when i open the dxf with Irfanview it looks diffrent and got the measures after scaling down.

Also tried Autodesk DWG TrueView 2026, there it looks fine too.

BR
alb

Posted: **Tue Dec 16, 2025 9:36 pm**

Additional info about the file I received by PM:
- Format: R11/R12 DXF Drawing (OpenDesign) (*.dxf)
- Aligned Dimensions
- These Dimension entities don't display the measured value, all labels are set to fixed strings.

A random Aligned Dimension example:
- Label = 189, measured value point to point at 96.04141924°= 76.01139683 (See Irfanview example above)
- Delta in Y = 75.589233
- Drawn at scale 1:2.5 => actual dY = 188.9730825 and rounded that is indeed 189

Why QCAD displays them different is perhaps because it evaluates the Dimension data in direct.
Rendering is not based on cached Dimension Blocks, see reply from Andrew here: Post 29344

You could attempt to fix these using the command line switch -recompute-dim with the original and !unchanged! files.
Normally we would set a Dimension scale, global or custom, but with fixed labels this is not required.

Also note that the font 'MONOTXT' is usually not installed.
DXF doesn't store font definitions.
It will be rendered in some installed font.

Irfanview uses a custom build plug-in to render CAD files. Kinda does what it does.

Regards,
CVH

QCAD.org Forum

Dimensions wrongly aligned when opend with QCAD /batch converted

Dimensions wrongly aligned when opend with QCAD /batch converted

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Re: Dimensions wrongly aligned when opend with QCAD /batch converted

Re: Dimensions wrongly aligned when opend with QCAD /batch converted