@oopearls/cad-simple-viewer

This package is a public fork of @mlightcad/cad-simple-viewer. It adds a locally built LibreDWG parser with improved handling for large R2007 DWG files and validates parser output before accepting a drawing.

Installation

npm install @ooopearls/cad-simple-viewer

The public API and peer dependency contract follow the upstream @mlightcad/cad-simple-viewer package.

Worker And WASM Deployment

The npm package contains these browser assets in dist:

• dxf-parser-worker.js
• libredwg-parser-worker.js
• libredwg-web.wasm
• mtext-renderer-worker.js

Copy them into a public directory in your application. The LibreDWG worker loads libredwg-web.wasm relative to the worker script, so those two files must remain in the same deployed directory.

const manager = AcApDocManager.createInstance({
  webworkerFileUrls: {
    dxfParser: '/cad-workers/dxf-parser-worker.js',
    dwgParser: '/cad-workers/libredwg-parser-worker.js',
    mtextRender: '/cad-workers/mtext-renderer-worker.js'
  }
})

Use AcApDocManager.checkWebworkerReadiness() or manager.areWorkersReady() before opening a drawing when the assets may be served from a separate CDN or deployment path.

Fork Changes

• Builds LibreDWG WebAssembly from pinned source commit 4d3fc98d7767c0881c5f24a801506819f2ab38eb.
• Applies the R2007 value-bound and EED allocation patch included in the public source repository.
• Bundles the matching LibreDWG Worker and WASM files in the npm tarball.
• Rejects empty or unusable parser results instead of treating them as a successfully opened drawing.

Source And License

This distribution includes GPL-covered parser Worker/WASM artifacts. See LICENSE, LICENSES/GPL-3.0-or-later.txt, THIRD_PARTY_NOTICES.md, and SOURCE.md in the package for license terms and corresponding-source access.

The complete fork source is available at github.com/tangsh0708/cad-viewer.