fix: close final viewer integration gaps (#5)

packages/viewer2d/src/index.ts

@@ -6,13 +6,15 @@ import { is2D, isDwg } from './ext2d';
 import { parseDxfBuffer } from './parseDxf';
 import { setDefaultFontUrl } from './slugText';
 
-export type { CadParseResult } from './dwgParser';
-
 export type CadInput = {
   name: string;
   data: ArrayBuffer | Uint8Array;
 };
 
+export type CadLoadSummary = {
+  entityCount: number;
+};
+
 export type Viewer2DOptions = {
   fontUrl?: string;
 };
@@ -26,7 +28,7 @@ export function isCad2DFile(name: string): boolean {
   return is2D(name);
 }
 
-export async function parseCad(input: CadInput): Promise<CadParseResult> {
+async function parseCad(input: CadInput): Promise<CadParseResult> {
   const buffer = toArrayBuffer(input.data);
   if (isDwg(input.name)) return parseDwgBuffer(new Uint8Array(buffer));
   if (is2D(input.name)) return parseDxfBuffer(buffer);
@@ -38,6 +40,16 @@ export async function parseCad(input: CadInput): Promise<CadParseResult> {
   return parseDxfBuffer(buffer);
 }
 
+export async function loadCad(
+  viewer: Pick<Viewer2D, 'load' | 'resize'>,
+  input: CadInput,
+): Promise<CadLoadSummary> {
+  const result = await parseCad(input);
+  viewer.load(result);
+  viewer.resize();
+  return { entityCount: result.entities?.length ?? 0 };
+}
+
 export function createViewer2D(container: HTMLElement, options: Viewer2DOptions = {}): Viewer2D {
   if (options.fontUrl) setDefaultFontUrl(options.fontUrl);
   return new Viewer2D(container);