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DXF/DWG: write the Model layout's plot type as extents, not "Layout information" (#765)

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The Model layout was written with the default page setup, whose "layout"
plot area is plot type 5, "Layout information" (DXF Reference, PLOTSETTINGS
group 74). That means nothing for model space: opened in AutoCAD 2027, a
drawing saved by CADCraft had a blank "What to plot", no preview and no scale
in the Plot dialog for Model. Model space now gets what PLOT does for it: the
drawing extents scaled to fit (74 = 1, 75 = 0). DWG saves go through the same
writer; the reader already ignores the Model layout's plot settings.

Co-authored-by: EP995LAB <293597958+EP995LAB@users.noreply.github.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>
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EP995LAB
2026-10-13 04:34:35 -04:00
committed by GitHub
co-authored by EP995LAB Claude Opus 5.5
parent 488308a2de
commit b19188919d
3 changed files with 76 additions and 2 deletions
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docs/file-format-parity.md
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@@ -1,6 +1,6 @@
# File-format parity
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-11 · **Change:** minor (code pages, #505; native MULTILEADER, #459; foreign data kept, #528; PDF text, layers and sheets, #567, #571; templates and user files, #552; plotter devices, #564) · **Target:** Autodesk AutoCAD 2027
> **Last reviewed:** 2026-10-10 · **Last updated:** 2026-10-12 · **Change:** minor (the Model layout's plot type is written as extents, not "Layout information") · **Target:** Autodesk AutoCAD 2027
Every format AutoCAD 2027 reads or writes, with CADCraft's support, fidelity and tests. Work
items are in [gaps.md](gaps.md#file-formats); the weighted score feeds
@@ -134,6 +134,7 @@ our output in AutoCAD black-box.
| Date | Change | Summary |
|---|---|---|
| 2026-10-12 | minor | DXF/DWG save: the Model layout's plot settings are written as CADCraft plots model space, drawing extents scaled to fit (PLOTSETTINGS 74 = 1, 75 = 0), instead of plot type 5 "Layout information", which other programs' Plot dialogs can't use for model space |
| 2026-10-11 | minor | Rows refreshed for merged work: code pages and `\M+` (#505), MULTILEADER (#459), IMAGE, MLINE/HELIX/REGION/TOLERANCE, VPORT/VIEW/UCS tables, modelled and raw objects, foreign data (#528), DWT templates and user `.lin`/`.pat`/`.pgp` files (#552), PDF output (#567, #571), plotter devices (#564), data extraction (#433, #534); weighted percentages not re-measured |
| 2026-10-11 | minor | DXF (ASCII and binary) and DWG saved at 2000–2018, 2018 by default (#421) |
| 2026-10-10 | minor | WIPEOUT and gradients written since #147/#162; other save losses remain (#201, #204, #208, #209, #213, #223) |