- unify Model and Paper Space plot area behavior
- add CTB discovery, read/write, and bundled defaults
- apply scale, render mode, and output options consistently
Hold edit leases and compare disk fingerprints before replacement so another editor cannot be silently overwritten.
Offer retry, reload, Save As, or explicit overwrite recovery.
Closes#498
SHAPE entities only drew a diamond placeholder — .SHX files were never
parsed. A new reader (scene/text/shx.rs) decodes the classic
`AutoCAD-86 shapes 1.0/1.1` container and interprets the full shape
bytecode — pen up/down, scale divide/multiply, position push/pop,
subshapes, signed XY runs, octant/fractional/bulge arcs, the 16
direction vectors and the vertical-only skip — into unit-space
polylines, cached per file and per shape number.
The entity resolves its STYLE by handle (name fallback), the style's
shape file with the shared path fallbacks (as stored → relative to the
drawing → basename next to it; traded files carry foreign absolute
paths), then places the glyph with size × relative X scale, oblique
shear and rotation through the OCS mapping. load_file now records
doc.source_path so render-time resolution knows the drawing's folder.
A missing or unreadable shape file keeps the diamond placeholder.
Co-Authored-By: Claude Fable 5 <[email protected]>
PDF underlays only drew their clip outline / insertion cross; the page
itself never appeared. The chain now runs: the definition's file path
resolves with the raster-image fallbacks (as stored, relative to the
drawing, basename next to the drawing — attach-time relative paths go
stale), the page rasterises through the system pdftoppm (poppler) at
150 dpi — no new crate; missing tool degrades to the outline — cached
per (path, page) including negative results, and the pixels feed the
existing image pipeline as an ImageModel: 1 underlay unit = 1 PDF inch
(px/dpi × entity scale), rotated about the insertion, fade as opacity,
the clip polygon (non-inverted) as the textured region. Draw-order,
layer visibility and per-viewport freezes ride the generic image path;
in-place edits rebuild through the shared image seed.
When the page renders, the wire path draws its frame with an interior
pick surface instead of the lone cross, so selection covers the visible
page. wasm keeps the outline placeholder (no external process).
Co-Authored-By: Claude Fable 5 <[email protected]>
Every rfd dialog result funnels through sys::handle_path, which now
records the picked file's folder (persisted to the config dir), and all
pickers are built via sys::file_dialog(), seeded with that folder.
Save-As keeps the current tab's own directory as the first choice and
falls back to the remembered one.
Co-Authored-By: Claude Fable 5 <[email protected]>
Section marks and drawing-view borders are now real acadrust entity
types instead of Unknown-with-extras, so the renderer dispatches on the
variant directly, the arrow-direction resolver reads the active viewport
off the ViewBorder entity, and selection / properties show "Section
Symbol" and "View Border" instead of "Unknown". View borders are
non-plotting and tessellate to nothing; both count toward the lossy
Save-As warning since they round-trip via their raw records.
Bumps acadrust for the entity promotion.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Double-clicking a drawing started a whole second copy of the app. Now it
lands as a tab in the editor already open, and that window comes forward.
The election is the bind itself: every GUI launch tries a deterministic
per-user loopback port, and the OS grants it to exactly one process and
releases it on any death, SIGKILL included. Nothing to reap, no PID to
probe, no stale lock after a crash. The winner serves the port from an
iced subscription; the loser checks it is talking to a matching editor,
hands the paths over and exits. Every surprise — no answer, a stranger on
the port, a timeout — boots a normal window, i.e. the old behaviour: the
feature can degrade, but it cannot lose the file.
The gate in main is positional, after every headless mode has returned.
The plugin runner is this same binary re-spawning itself, so a flag list
would rot the first time a mode is added; a position cannot.
Handing a drawing over that is already open switches to its tab instead
of loading a second copy, comparing resolved paths so a symlink or a
`..` hop is still recognised as the same file.
`opening` is a single slot that a second open would overwrite, and
on_file_opened drops any result arriving once it is clear — so drawings
handed over at once would silently vanish. They queue in pending_opens,
drained from every path that clears the slot, error and cancel included.
Exec becomes %F so one launch takes the whole selection; the CLI takes a
list and boot fans it out through the same door. --new-instance forces a
separate process; --read-only / --script / --new always get their own.
Not reused: the automation server. It dispatches arbitrary commands and
writes arbitrary paths, and its open replaces the active tab's document
in place — publishing that on a port every local process can reach would
be unforced privilege escalation. Only its JSON-lines framing is shared.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
WebGL2 has no vertex/fragment storage buffers, so the batched storage-buffer
hatch renderer (hatch_gpu) is disabled on wasm and real hatch fills never
rendered on the web build — the pick highlighted the boundary and the command
then appeared to cancel (issue #204).
Add a wasm-only per-hatch renderer (hatch_web_gpu + hatch_web.wgsl) that packs
the variable-length boundary / family / dash arrays into one RGBA32F data
texture read with textureLoad, instead of the fixed-size uniforms of the
wipeout path. This removes the MAX_FAMILIES (16) / MAX_HATCH_BOUNDARY_VERTS
(1024) / MAX_DASHES (128) caps, so every hatch — solid, gradient, and
arbitrarily complex line patterns — renders on the web. The fill algorithm
(in_polygon, per-family line/dash/dot, gradient, LOD, double-single vertex
transform) is identical to the desktop path; only the array ACCESS changes.
Pattern phase is anchored at world_origin with the boundary stored raw, and
scale / gradient-range clamped, to match the desktop batched renderer exactly.
Native (hatch_gpu + hatch.wgsl) and the wipeout mask renderer are untouched;
the new module and pipeline are gated on target_arch = "wasm32".
Also silence the resulting (and pre-existing) wasm-only dead-code warnings for
native-only paths so both the native and web builds compile clean.
Closes#204.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Some DWGs written by other programs leave the root named-objects
dictionary unrecoverable: the header pointer names a non-dictionary and
the real NOD child dicts are owned by a table-control handle, so nothing
has owner==NULL. Navigating the root then silently no-ops, and
registering a new named-object entry (page setup, annotation scale, CTAB)
against the missing root orphans it — it never round-trips.
Add shared annotative::root_named_dict_handle(): resolve the header
pointer, else adopt the richest owner==NULL dict, else synthesise a fresh
root and write it back. Route ensure_plotsettings_dict, add_scale's
scalelist-create branch, and set_saved_active_layout through it. Resolve
the plot-settings dict via the PlotSettings owner when the header pointer
is stale, mirroring scalelist_dict_handle.
Verified page setups survive a DWG save/reload on the repro file with
layouts intact.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Saving from a non-first paper layout still reopened on the first paper
tab: set_saved_active_layout only updated an existing CTAB entry, but
documents authored here never carried one, so CTAB was never written and
the reader fell back to $TILEMODE (which only records model-vs-paper) →
the first paper layout.
set_saved_active_layout now creates the CTAB DICTIONARYVAR under the root
named-object dictionary when it is absent (updating in place otherwise).
The root dictionary is taken from the header handle, or found by scanning
for the dictionary that holds ACAD_LAYOUT when a from-scratch document
has not populated the header handle yet. The writers persist it (they
serialize the document's objects and root-dictionary entries; the
root-dict rebuild in CadDocument::build() is not run on save).
Adds tests/active_space_roundtrip.rs, including a full DXF save→reload
round-trip asserting both $TILEMODE and CTAB survive.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Files saved while a paper layout was active reopened in Model space
because the loader hardcoded the current layout to "Model" and never
consulted the space recorded in the file.
The active space is a standard part of the format and acadrust already
round-trips it: $TILEMODE (header.show_model_space) for model-vs-paper,
and the CTAB current-tab variable for the exact layout name.
- Read: on open, pick the current layout from CTAB (when it names a
layout that exists), else $TILEMODE (Model, or the first paper layout).
- Write: Scene::sync_active_space_to_document() mirrors the active layout
back into the document (show_model_space + CTAB). It runs from
set_current_layout, so every active-layout change — the status-bar tab,
the Layout Manager's Set Current, create / rename / delete, and
undo/redo — keeps the document in sync for the next save.
$TILEMODE is the guaranteed mechanism (read and written for both DXF and
DWG); CTAB refines the exact tab when the variable is present.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Replace the custom in-app file-browser save dialog with the native OS
save dialog for choosing the destination path — folder browsing and
overwrite confirmation now come from the OS. A compact in-app modal
still selects the DWG/DXF format and version (a native dialog cannot
carry the version year) and appears only for Save As. Plain Save on an
unsaved drawing defaults to DWG 2018 with no picker. The file-name field
is shown only on web, where there is no native dialog.
Remove the hand-rolled directory listing, folder navigation, and
overwrite modal.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Generate a small wire-raster thumbnail when saving a DWG and embed it via
acadrust's preview API, so OCS drawings show a thumbnail in file browsers
and other CAD applications. Read the embedded preview back cheaply (file
header + preview bytes only, no full parse) to show a thumbnail per file
in the Start page's Recent Documents panel.
- io/thumbnail.rs: CPU rasterizer (current-layout wires -> BMP DIB) plus
a preview-only reader/decoder (BMP/PNG -> iced handle) for the Start
page.
- Embedded on save via stamp_thumbnail on both save paths.
- recent_thumbs cache filled on config load / recents change (never from
a view); a thumbnail is drawn beside each recent file.
Requires acadrust at 3111694 (preview read/write), already pinned in
Cargo.lock.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Pick a rectangular window in model space with the existing PLOTWINDOW command (now enabled in model space, previously paper-space only) and export it to a PDF at a chosen ISO paper size (A4-A0), orientation and scale (fit or ratio). The window is a hard clip boundary. Adds paper-size presets, a window-to-sheet transform, scale + clip support in the PDF exporter, and Page Setup controls (format/orientation/pick window).
An entity added via a plugin's AddEntity with a common.layer name that no
LAYER command ever created kept its layer in-session, but the DWG writer
resolves an unknown layer name to a NULL handle, so on reopen the entity
collapsed to layer 0.
Add a shared Scene::ensure_layer(name) that registers a missing layer with a
real handle (allocate_handle, per #67) and call it from add_entity and
update_entity. This covers the plugin AddEntity/UpdateEntity IPC and every
internal add path without a new IPC request. Existing/empty/"0" layers are
no-ops, so normal draw commands are unaffected.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
A periodic subscription (every SAVETIME minutes — default 10, 0 disables)
writes a <name>.sv$ recovery copy of each dirty, already-saved drawing at its
own DWG version. Non-destructive: it never touches the original file or the
dirty flag, and skips unsaved (path-less) tabs. The SAVETIME command
sets/queries the interval and persists it. Recovery files (.sv$ and .bak) open
through the normal Open dialog — the loader detects DWG vs DXF from the leading
magic bytes, and a "Backup / Autosave" filter lists them.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
- Save: overwriting an existing file first copies it to a sibling <name>.bak
(default on; toggle with the ISAVEBAK command, persisted in settings).
- Open: .bak is a first-class type — the Open dialog lists it and the loader
detects DWG vs DXF from the file's leading magic bytes (the extension hides
the real format).
- File association registers .bak too, every launch (so users who associated
earlier get it automatically): Windows via the registry; Linux via a
high-priority shared-mime-info magic that resolves DWG/DXF content under the
.bak extension, with the generic *.bak glob claimed only once the app is the
default DWG handler — so it never hijacks other apps' backups.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Two in-canvas confirmations on the Save-As path:
- AEC/Civil drop warning: when the drawing carries unsupported AEC/Civil
(application) objects that survive only as verbatim source-version bytes,
saving to a different version or to DXF would silently drop them. The
dialog reports the count and offers "Save in source version" (keep) vs
"Save anyway" (drop). Same-version DWG saves are lossless and skip it.
- Overwrite confirmation: when the chosen filename already exists in the
target folder, "Replace" / "Cancel" before clobbering it.
The two chain (AEC first, then overwrite) via per-flow acknowledgement flags
reset whenever the Save dialog opens or closes. Detection is a new
io::dropped_on_save_count over the document's Unknown (raw-passthrough)
objects/entities.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Civil3D/AEC objects (and raw MLEADER/Surface records, EED) can only be
written losslessly in their source DWG version. On save, fall back to the
source version when the chosen version is an incompatible encoding family
(acadrust CadDocument::has_version_locked_data), with a command-line
notice, across every save path (Save, Save As, save-before-close/quit)
via a shared dwg_save_version helper. Default the Save-As format dropdown
to the loaded file's version so a round-trip preserves it.
Picks up acadrust DWG-writer conformance fixes (3dbae05) so a Civil3D
R2004 drawing round-trips through OCS and opens in AutoCAD with no errors.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Re-pins acadrust to the dimension DXF round-trip fixes (rotation/text/oblique
degree<->radian units, radial/angular/ordinate group codes, ordinate X/Y bit)
and drops the OCS-side fix_dxf_dimension_rotations dimension arm, which now
lives in the acadrust DXF reader (keeping it here would double-convert).
Completes the dimension audit (Batch 5). Refs #181.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Relocate three root-level modules into io/, where they belong by concern:
- update_check.rs -> io/update_check.rs (its own doc-comment notes it
mirrors how crate::io wraps blocking calls in async).
- patterns.rs, linetypes.rs -> io/ (standard resource catalogs parsed
from asset files and populated into the document — IO-shaped work).
Fix the moved files' include_str! paths (one level deeper), add the
mod declarations to io/mod.rs, drop them from lib.rs/main.rs, and
re-point all crate:: references to crate::io::. No behavior change.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
A DWG DIMENSION references an anonymous *D<n> block that holds its drawn
geometry; AutoCAD-family readers render that block rather than re-deriving it
from the definition points. OCS re-tessellates dimensions for display and never
materialises the block, so on save a created dimension goes out referencing a
block that doesn't exist and the writer emits a null block handle. Strict
readers (DWG TrueView, QCAD) then drop the dimension or demand a recovery, and
lenient ones (BricsCAD) regenerate it at a different position.
Add bake_dimension_blocks(), called on the cloned document in
io::save_as_version / save_to_bytes, which builds a *D<n> anonymous block from
each block-less dimension's exploded geometry (extension lines + dimension line
+ measurement text) and points its block_name at it. Dimensions that already
own a block (imported, or copied via the *D-cloning copy path) are left
untouched.
Verified end-to-end: before, AutoCAD/Civil 3D 2026 reads 0 dimensions from an
OCS-saved file; after baking it reads all of them.
Fixes#178, #181, #182.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Issue #170's fix added a "This PC" volumes root above the drive
letters on Windows. Generalize it so the Save As dialog can switch
volumes on every platform:
- parent_folder() now climbs the filesystem root into the volumes
list on all platforms (`/` -> Computer), not just Windows.
- available_drives() is platform-specific: Windows probes A:-Z:,
macOS lists `/` + /Volumes/*, Linux lists `/` + the removable
mounts under /run/media/$USER, /media/$USER and /mnt. Other Unix
and wasm fall back to `/`.
- drives_root_label() shows "This PC" on Windows, "Computer" elsewhere.
- read_dir_entries() lists the volumes at the drives root on every
platform.
Also gitignore the dist/ web build output so the wasm binary is never
committed by accident.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
The custom Save As dialog navigated up the tree solely via
`Path::parent()`, which returns `None` at a drive root (`C:\`).
Navigation therefore dead-ended on the starting volume, so other
drives and USB sticks were unreachable.
Add a synthetic Windows "This PC" drives root above the drive
letters. `parent_folder()` now climbs `…\sub → C:\ → This PC`, and
`read_dir_entries()` lists the available volumes (probed A:–Z: by
stat, no new dependency) when at that root. The dialog's up-button
and path bar route through the same helper and show "This PC".
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Gate target-specific code so neither build warns about the other's items:
native-only helpers (view, window icon, file dialogs, file association, plugin
host/guard/registry, self-update) are cfg'd to non-wasm; the wasm-only font
fallback (script_of / cjk_lang / request) is cfg'd to wasm. Drop an unused mut,
allow the few genuinely-conditional dead items (mesh_click_hit, GPU layout
helpers, parity stubs), and gate the embedded PlotSettings-unrelated dead
constants. Both targets now build clean (only the unavoidable nom/quick-xml
future-incompat dependency notice remains).
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Remove accidental dead code (unused imports, the superseded paste tool()
helper, a never-read TORIENT handles field, a duplicate let binding, an
unneeded mut) and mark intentional-but-unwired scaffolding with
allow(dead_code): the web-only save_to_bytes, the plugin loadable() probe,
the planned PICK_HIGHLIGHT colours, the DynFieldSpec label, and the layout
ribbon helpers. Native build is now warning-clean apart from the upstream
nom/quick-xml future-incompat notices.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
The web save path discarded the chosen format version (`let _ = version`)
and `save_to_bytes` never applied it, so every browser download was
written at the document's default version (AC1032 / DWG 2018) regardless
of the format picked in the Save dialog. (#122)
Thread `version` into `save_to_bytes` and set `doc.version` there, the
byte-buffer counterpart to `save_as_version`. Saving as DWG 2013 now
writes an AC1027 file.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
On the web, Save and Save As now open the in-app Save dialog (filename +
format) like the desktop, and the unsaved-changes prompt's Save routes
through it too — instead of an immediate rfd download. Confirm serializes
to bytes and downloads directly via a Blob + hidden `<a download>` click
(a user gesture), so there is no intermediate "click to download" link.
Replaces the rfd-based download_web / WebSaveResult round-trip with a
synchronous sys::download_bytes. Native save is unchanged.
Native + web build; 75 tests pass.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Wire up save for the web build:
- `io::save_to_bytes`: serialize a document to a byte buffer (DXF via
write_to_vec, DWG via write_to_writer over a Cursor).
- `io::download_web`: browser save dialog → write bytes (triggers a
download).
- Save and Save As on wasm both go through a new `web_save` helper:
serialize the active tab and offer a download (no persistent path or
in-app save dialog on the web). Format follows the tab name's
extension, defaulting to DWG. Result reported via `WebSaveResult`.
Native build + 75 tests unchanged.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Wire up file open for the web build:
- `io::pick_and_load_web`: browser file picker → read bytes → parse via
`load_bytes` → build caches, returning the same payload as the native
loader so it feeds the shared `Message::FileOpened` handler.
- `Message::OpenFile` cfg-dispatches: native picks a path then loads on a
worker thread; web picks + parses in one async step. The web branch also
sets `opening` (the handler drops results when no open is in progress).
- Disable the cosmic-text shaping / fallback paths on wasm: the web has no
system fonts, so cosmic-text panics with "no default font found". LFF
stroke fonts (embedded) still render; LFF-missing glyphs are skipped.
Native build + 75 tests unchanged. Hatches still don't draw on the web.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
With the wasm bundle building, get it rendering in a browser:
- Enable iced `webgl` so wgpu uses WebGL2 where WebGPU is absent
(e.g. Firefox by default), and `fira-sans` so UI text has an
embedded font (the web has no system fonts) — without it every
label was blank.
- Replace `std::time::Instant` with `iced::time::Instant` (web-safe);
`Instant::now()` panics ("time not implemented") on wasm and crashed
at boot via the command line.
- Skip the batched-hatch pipeline on wasm: its bind group needs
vertex-stage storage buffers, which WebGL2 lacks (validation error
on "New drawing"). Fields become Option; upload/draw guard on them.
Hatches don't draw on the web for now; everything else does.
- Fix the trunk feature flag (`data-cargo-no-default-features`) and
ignore the `dist/` build output.
Native build + 75 tests unchanged.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Add a cross-platform `io::load_bytes(name, bytes)` that parses DWG/DXF
from an in-memory buffer via acadrust's stream readers (Cursor), picking
the format from the name's extension. This is the foundation for opening
files on the web, where the browser delivers bytes rather than a path.
Native keeps the streaming `load_file` (lower memory on large drawings);
both share the post-load fixups. Builds on native and wasm.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
wasm32 has no threads, so rayon's global pool would panic at runtime.
Add `crate::par::prelude`: native re-exports `rayon::prelude`, wasm
provides sequential `std`-iterator equivalents (par_iter / into_par_iter
/ flat_map_iter over slices, Vec, HashMap, HashSet). All call sites now
`use crate::par::prelude::*;` instead of rayon directly.
- wire_gpu's rayon `reduce` (2-arg, no std equivalent) is cfg-split to
a sequential flat_map concat on wasm.
- rayon moves to a non-wasm target dependency.
Native still runs in parallel; all 75 tests pass. wasm bin compiles.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
First step toward a web build: the library now compiles for
wasm32-unknown-unknown with --no-default-features.
- Add a `solid3d` feature (default on) gating truck-meshalgo /
truck-shapeops / lzma-sys. These pull vtkio → xz2 → lzma-sys (C),
which cannot cross-compile to wasm. Without the feature the 3-D
solid path (tessellation, booleans, ACIS import) becomes no-ops;
2-D CAD is unaffected. Native builds keep the feature by default.
- Move native-only crates (ureq, open) to non-wasm target deps and
add cfg shims: update-check is a no-op on wasm, and a new `sys`
module provides open_url + handle_path (rfd FileHandle → PathBuf;
synthesizes a name-based path on the web).
Native build + all 75 tests unchanged. Browser runtime wiring
(entry point, trunk, real file I/O) is a follow-up.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
A RasterImage stores its path on the linked ImageDefinition, usually as the
original author's absolute path (e.g. a Windows/VMware share) that doesn't
exist locally, so the image silently failed to load. On open, resolve each
raster image: use the stored path if it exists, else fall back to the same
file name next to the drawing, and write the resolved path onto the entity.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
On the first launch that hasn't answered it yet, the app shows a small
dialog offering to become the default handler for .dwg and .dxf files.
The choice is persisted (default_assoc_prompted) so the prompt never
reappears.
The platform plumbing lives in io/file_association.rs:
* Windows — opens the OS's own per-app default-programs dialog via
IApplicationAssociationRegistrationUI::LaunchAdvancedAssociationUI,
passing the "Open CAD Studio" RegisteredApplications name the MSI
registers. Modern Windows guards the actual default behind a
UserChoice hash, so this is the supported consent path.
* Linux — xdg-mime default against the installed .desktop file, whose
MimeType entries already cover image/vnd.dwg and image/vnd.dxf.
* macOS — LSSetDefaultRoleHandlerForContentType binds the DWG/DXF UTIs
declared in Info.plist to the app bundle id.
The work runs on a dedicated thread (the Windows dialog is modal) with
the result delivered back through a oneshot channel and surfaced in the
command line.
https://claude.ai/code/session_01DFVSKgViFaxEjZD2KsTdtt
A 35-unit arc sweeping 6.5e-7 rad has arc length 2.3e-5 — past the
arc-length floor — yet start/mid/end bow off the chord by only ~2e-12.
truck's 3-point circle_arc fit then returns a near-infinite radius and
parameter_division subdivides without bound, hanging the load. Gate on
the sagitta (r·(1−cos(sweep/2))), the true measure of the fit's
conditioning, so long thin arcs survive and sub-precision ones drop.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
sample_layout_03/04.dwg would not open: a periodic 9-control-point spline
with every control point pinned at the origin (zero extent) reaches truck's
parameter_division, which never converges on a zero-length curve and hangs
the first-frame tessellation. The spline passed every existing guard
(finite points, no knots, degree 3). Reject splines whose control-point
extent is sub-precision (< 1e-6 on all axes).
Verified: all five sample_layout DWGs now load + tessellate (03/04 went
from a hang to ~356 ms; 01/02/05 unchanged, no valid spline dropped).
Co-Authored-By: Claude Opus 4.8 <[email protected]>
DWG stores the current text/dim/multiline style as a header handle; the
writer keeps a valid stored handle and otherwise falls back to Standard,
so a Set Current change (which only updates the name) was lost on DWG
save. Treat the current-style names as the source of truth and re-resolve
the header handles from them at save time, alongside the table/multileader
variable-dictionary sync. Now every current-style choice round-trips
through DWG, not just DXF.
Co-Authored-By: Claude Opus 4.8 <[email protected]>
Hakan Seven