How to get the modelspace extents

[filippopoggini]

How we could calculate the size of the draw in a dxf file?
We would like to know the coordinates x and y for any shape:

• top left point
• top right point
• bottom left point
• bottom right point

In this case, we could calculate the max square area of the draw.
Thanks in advance for your help.

[AGeissler]

This is not really an issue, but a "how to" question. Have you looked in the documentation and searched for "extent"? There are several entries for this, possibly e.g. "Calculate Extents for the Modelspace" will meet your needs?

[filippopoggini]

I will look documentation about extent. Thanks

…

On Tue, Dec 27, 2022, 17:49 AGeissler ***@***.***> wrote: This is not really an issue, but a "how to" question. Have you looked in the documentation and searched for "extent"? There are several entries for this, possibly e.g. "Calculate Extents for the Modelspace" will meet your needs? — Reply to this email directly, view it on GitHub <#812 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/A2LZUM7PY4TTC3TXELHHMJLWPMMX3ANCNFSM6AAAAAATKRXFMA> . You are receiving this because you authored the thread.Message ID: ***@***.***>

[filippopoggini]

I tried to get limit of shape in my dxf with code below:

print(doc.header['$EXTMAX']) #output: (8.5, 11.0)
print(doc.header['$EXTMIN']) #output: (0.0, 0.0)
print(doc.header['$LIMMAX']) #output: KeyError: '$LIMMAX'
print(doc.header['$LIMMIN']) #output: KeyError: '$LIMMAX'
print(doc.header['$PEXTMAX']) #output: KeyError: '$LIMMAX'
print(doc.header['$PLIMMIN']) #output: KeyError: '$LIMMAX'
print(doc.header['$PLIMMAX']) #output: KeyError: '$LIMMAX'

I suppose that some keys do not exist in my dxf file (8.5, 11.0) and (0.0, 0.0) do not really are limits of my shape.

I attach my sample shape (a star), how could I calculate the width and height of my shape?

[mozman]

The values stored in the HEADER section are not reliable, many third party libraries do not maintain these values and neither does ezdxf automatically.

Use the bbox module to get the extents of DXF entities. For calculating the bounding box of the modelspace use:

from ezdxf import bbox

# -x-x-x- snip

bounding_box = bbox.extents(doc.modelspace())

BTW: when you edit the output of your script, please be careful, if the errors are not as obvious as in this case, it might waste a lot of time of someone trying to help you (most likely me).

[filippopoggini]

Dear Manfred,
bbox was the solution, it works awesome.

Thanks for your support.

Best regards