build.ts

// Authoring helpers — build the typed `Scene` from intuitive, EDGE/BOUNDS-based
// inputs instead of center+size. The renderer consumes the same `Scene` types,
// so these only change how scenes are *written*, never how they *draw*.
//
// Everything is in INCHES. Origin at the interior NW corner; +x east, +y south,
// +z up. See sample.ts for the layout and a worked authoring guide.

import type { Fixture, Opening, Room, Scene, Vec2, Wall } from './schema';

/** Inclusive [edge, edge] extent on one axis. Order doesn't matter. */
export type Span = [number, number];

const lo = (s: Span) => Math.min(s[0], s[1]);
const hi = (s: Span) => Math.max(s[0], s[1]);
const mid = (s: Span) => (s[0] + s[1]) / 2;
const len = (s: Span) => Math.abs(s[1] - s[0]);

// ── Scene assembler ──────────────────────────────────────────────────────────
/** Assemble a full Scene from its parts (fills units + wraps the single level). */
export function scene(opts: {