How to intersect entities to create new geometry

[arun]

Hi,
I have the following entities in my dwg

• a slab layer containing a polyline entity

• a beam layer containing multiple polyline entities

I know how to identify the beam entities that are contained inside the slab polyline.
How do I divide the big slab into multiple smaller slabs?
Or how do I generate new polylines that share the edge of the beam entities (here the edges will be between intersections of beams)

Attaching along screenshots and dxf file
Yellow indicates Slab & Red indicates Beam

Thanks,
Arun

Version: QCAD Professional 3.28.2 on MX Linux

[CVH]

Hi,

QCAD has no concept of enclosed areas.

You could play with a solid hatch of a multiple selection.
If the hatching works out then you can select it and explode it to the boundary shapes.
These shapes can then be merged into polylines.

Regards,
CVH

[arun]

Thanks CVH. Will check this out.

[CVH]

Hi,
made a trial case with your Slab Test.dxf and it doesn't work out.
You get the initial 6 polylines back exploded to 24 lines.
The solid hatch looks perfect but the beam shapes are not merged for that.

Like I said, QCAD can not merge, subtract, xor ... areas, everthing is basically line art.

look here for how I merged 13242 filled areas of various entity types into 384+17 closed contours.
https://www.qcad.org/rsforum/viewtopic.php?f=32&t=10305
The example was way more complex than your example where it is the matter of drawing 4 new rectangles.

You need to write a really clever script to perform this kind of operations.

Regards,
CVH