feat(viewer2d): render DWG lineweight in screen pixels

Every line was drawn 1px regardless of its CAD lineweight. Two causes:
the dwg-wasm parseResult never carried the field (acadrust reads
EntityCommon::line_weight but it was dropped in serialization), and the
renderer merged all segments into one LineSegments whose
LineBasicMaterial.linewidth WebGL ignores.

Resolve ByLayer/ByBlock/Default per entity and bucket segments by
dash|lineweight. Weighted buckets get their own LineSegments2 +
LineMaterial with worldUnits:false, so width stays constant in pixels
while zooming - AutoCAD LWDISPLAY semantics - at 8 px/mm (0.25mm = 2px).
Anything at or below the 0.25mm default stays in the hairline batch so
drawings that never assigned a weight render exactly as before.

Fat batches are instanced, so layer masking compacts the instance buffer
and lowers instanceCount instead of rewriting an index; slotOf tracks
where each segment moved so the selection highlight still finds its
vertices. Per-entity color spans (meta.spans) let the highlight repaint
across the hairline batch and every bucket it touched. Buckets past
400k segments fall back to hairline to bound GPU/heap cost.

Display follows the drawing's LWDISPLAY and can be forced from the
toolbar; the property panel now shows the entity lineweight.

Verified headless at a fixed camera on the 65k-entity road drawing:
cyan road edge 2px -> 5px, layer hide/restore returns the exact baseline
pixel counts, and a 0.35mm LWPOLYLINE selects and highlights.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

This commit is contained in:

minsung

2026-08-04 17:25:11 +09:00

co-authored by

Claude Opus 5

parent eec33820a6

commit c67a803e4d

12 changed files with 6922 additions and 34 deletions

									
										src/viewer2d/Viewer2D.d.ts
									
Vendored

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				@@ -16,6 +16,9 @@ export class Viewer2D {

				  setAccent(hex: string): void;

				  setTheme(dark: boolean): void;

				  setGrid(visible: boolean): void;

				  /** Lineweight display (AutoCAD LWDISPLAY); null follows the drawing's own flag. */

				  setLineweightEnabled(on: boolean | null): void;

				  getLineweightEnabled(): boolean;

				  getLayerInfo(): { name: string; colorHex: string; count: number; visible: boolean }[];

				  setHiddenLayers(nameSet: Set<string>): void;

				  /** Model / Paper (Layout) spaces for the loaded drawing. */