Karim Jerbi
32c3844526
Each ribbon panel was rendered five ways every frame so CollapsePanels could roll back to any density at layout time: full, compact, button, tight and a full-size flyout that duplicated the full rendering. The layout pass ran four full measure-layouts per panel even in forced modes, and the degradation decision was an untested u8 inline in Ribbon::view. Now the choice is a pure, unit-tested decide_levels() whose levels are a typed Level enum (Full/Compact/Collapsed/Tight). Panel carries its four renderings as elements: [Element; 4] indexed by Level, with a slot(i, level) helper for the tree stride. Forced modes (Full/Compact/Collapsed) measure nothing at all and derive the row height from the placed panel. The open flyout draws the panel's own `full` rendering inside a self-drawn box (identical weakest-bg + 1px neutral-border to the container it replaced), so no duplicate render_group is built per panel per frame. Level, Panel, Widths, CollapsePanels and decide_levels are pub(crate); CollapseMode stays pub (re-exported). Tests (collapse.rs tests module, added RED first): - forced_modes_pin_every_panel - auto_huge_width_keeps_everything_full - auto_degrades_from_the_right_one_panel_at_a_time - auto_stops_degrading_once_the_row_fits - auto_escalates_a_single_panel_past_collapsed_to_tight - auto_cascade_drops_every_collapsed_panel_to_tight - auto_runs_the_compact_phase_across_the_row_first - no_panels_stays_empty - single_panel_walks_the_whole_ladder - zero_widths_never_overflow - endless_row_degrades_everything_to_tight - unbounded_row_keeps_everything_full - nan_budget_degrades_both_phases_but_no_tight_cascade - exact_fit_at_full_stays_full - matches_the_pre_refactor_algorithm: byte-equivalence sweep against the verbatim pre-refactor u8 algorithm (280 width/budget combos incl. the degenerate 0/0/inf/NaN inputs), proving the decision logic is unchanged. Measured with the committed #[ignore]d benchmark (`cargo test --lib --release -- --ignored --nocapture bench_ribbon_view_construction`) run as one instrument across pre-change / this change: Ribbon::view() construction ~676 -> ~425 us/frame (~37% of view construction saved); forced modes run 1 layout call per panel per frame instead of 5. Verification: cargo build clean; cargo test --lib = 382 passed (367 baseline + 15 new ribbon tests) / 2 known pre-existing failures unchanged (save_then_open_round_trips, tilted_ucs_places_planar_entities_with_the_plane_normal).
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Open CAD Studio
Open-source 2D drafting and 3D modeling for desktop and web, built with Rust.
Launch the web app · Download the desktop app · Join the discussion
Overview
Open CAD Studio is a cross-platform application for technical drawing, layout work, and solid modeling. It reads and writes DWG and DXF drawings natively, with a shared editing core across the desktop and browser versions.
The project is under active development. Keep backups of important production drawings and report reproducible problems through GitHub Issues.
Highlights
- Native drawing workflow — open, edit, recover, and save DWG and DXF files without a conversion service.
- Precise 2D drafting — lines, polylines, curves, splines, hatches, object snaps, tracking, layers, blocks, and external references.
- Documentation tools — text, dimensions, leaders, tolerances, tables, model space, paper space, viewports, and plot styles.
- Kernel-backed 3D modeling — solid primitives, extrusion, revolution, sweep, loft, Boolean operations, and ACIS entity tessellation.
- GPU rendering — accelerated 2D and 3D viewports through
wgpu, with orthographic and perspective cameras. - Extensible workflows — native plugins, command scripts, headless conversion, and a line-based JSON automation API.
File workflows
| Format or workflow | Support |
|---|---|
| DWG | Read and write; versioned save targets from R14 through 2018 |
| DXF | Read and write; versioned save targets from R14 through 2018 |
| BAK / SV$ | Open drawing backups and autosave files |
| OBJ | Import polygon meshes |
| LandXML | Import CgPoint survey points |
| STL | Export 3D mesh data |
| STEP AP203 | Export 3D mesh data |
| Plot layouts and selected geometry on desktop | |
| CSV | Extract entity property data |
| CTB / STB | Load and edit plot style tables |
Desktop or web
Use the web app for immediate access with no installation. Drawings are selected through the browser and saved as local downloads.
Use the desktop application for native file associations, file-manager thumbnails, system printing, PDF output, external plugins, command scripts, and headless automation. Release builds are available for Windows, Linux, and Apple Silicon macOS.
Install
Download all current packages from the latest release.
Windows
Choose one of these signed x86-64 packages:
OpenCADStudio-*-windows-x86_64-installer.msi— recommended installer with Start Menu shortcuts, DWG/DXF file associations, and drawing thumbnails.OpenCADStudio-*-windows-x86_64-portable.exe— standalone application; no installation required.
Linux
Download the x86-64 AppImage, make it executable, and run it:
chmod +x OpenCADStudio-*-linux-x86_64.AppImage
./OpenCADStudio-*-linux-x86_64.AppImage
macOS
The published macOS package supports Apple Silicon:
- Download
OpenCADStudio-*-macos-arm64.dmg. - Open the image and drag
OpenCADStudio.appinto Applications. - If Gatekeeper blocks the first launch, approve the app from System Settings → Privacy & Security.
The application is ad-hoc signed but is not currently notarized by Apple.
Languages
Open CAD Studio can follow the system language or use any of these 19 interface languages:
Arabic · Brazilian Portuguese · Czech · Dutch · English · Finnish · French · German · Hindi · Hungarian · Italian · Japanese · Korean · Polish · Russian · Simplified Chinese · Spanish · Traditional Chinese · Turkish
Change the language from the application settings. The browser version also uses the browser's preferred locale when System is selected.
Build from source
Desktop
Requirements:
- Git
- Current stable Rust toolchain
- Platform graphics and font development libraries
On Ubuntu or Debian, install the native dependencies with:
sudo apt update
sudo apt install libgl1-mesa-dev libx11-dev libxcursor-dev libxi-dev \
libxrandr-dev libxkbcommon-dev libwayland-dev libfontconfig1-dev \
libfreetype6-dev
Then build and run:
git clone https://github.com/HakanSeven12/OpenCADStudio.git
cd OpenCADStudio
cargo build --release --bin OpenCADStudio
The resulting binary is written to target/release/OpenCADStudio (OpenCADStudio.exe on Windows).
Web
Install the WebAssembly target and build tools once:
rustup target add wasm32-unknown-unknown
cargo install trunk wasm-bindgen-cli
Start the development server:
trunk serve
Automation
The desktop binary supports one-shot conversion and a persistent headless server:
OpenCADStudio --export input.dwg output.dxf
OpenCADStudio --serve
OpenCADStudio --serve --port 4242
The server exchanges one JSON object per line over standard input/output or a local TCP socket. See the automation guide and the included Python client.
Plugins
Desktop plugins run in separate processes and communicate with the host through the versioned plugin API. The browser build does not load native plugins.
Project documentation
Contributing
Bug reports, focused pull requests, translations, documentation improvements, and plugin contributions are welcome.
- Search existing issues before opening a new report.
- Use Discussions for questions and ideas.
- Report vulnerabilities privately by following the security policy.
Project growth
Support the project
If Open CAD Studio helps your work, support continued development through GitHub Sponsors or Patreon.
License
Open CAD Studio is distributed under the GNU General Public License v3.0.