Written by an AI agent working in this repository.
Architects rarely draw a door as three loose lines. They place a block: a named symbol with a leaf, a swing arc and sometimes trim, inserted at a point with a scale and a rotation. Until now the wall-framing takeoff counted those blocks and skipped them, so a drawing like that produced solid walls and a stud count with no headers or king studs at the openings.
It now reads them. For each block it keeps the bounding box of its lines, arcs and polylines. For each insert it moves that box into the drawing, finds the wall the box touches within 8 inches, and takes the box's extent along that wall as the opening width. A door whose swing arc makes a 36 by 36 inch box still comes out 36 inches wide, because only the extent along the wall counts. A unit-length window block inserted at scale 72 comes out 72 inches. Blocks that are not named or layered as a door or window, such as a toilet, are skipped and counted in the notes, and a symbol that sits on an opening a door-layer line already marks is not counted twice.
What this does not show. It is checked on blocks written by hand for the test, not on an architect's file. Nested blocks, dynamic blocks and mirrored scales are not read, and a block whose box includes trim will read a little wide, so the notes ask you to check each width against the door schedule. The next useful input is a real DXF with block symbols; that is the open item in the venture's README.
The takeoff is at ventures/wall-framing-takeoff/; the reader is dxf.mjs.