raster.test.ts

1	import { readFileSync } from 'node:fs'
2	import { describe, expect, it } from 'vitest'
3	import {
4	RASTER_HEIGHT, RASTER_MAX_HEIGHT_M, RASTER_MIN_HEIGHT_M, RASTER_WIDTH,
5	} from '../src/views/raster.js'
6	import { MAP_CUT_WITHOUT_SLATS } from '../src/canon/geometry.js'
7
8	const geo = JSON.parse(readFileSync('content/geography.json', 'utf8')) as {
9	render: {
10	gridWidth: number; gridHeight: number
11	minHeightM: number; maxHeightM: number; mapThetaOrigin: number
12	}
13	}
14
15	/**
16	* The interior view displaces its shell by the height raster and paints it with the
17	* colour raster. Both are read as fractions of numbers the app cannot see, so if
18	* the generator's idea of them ever drifts, the terrain moves or flattens with no
19	* error anywhere.
20	*/
21	describe('raster metadata matches the generator', () => {
22	it('agrees on the grid', () => {
23	expect(geo.render.gridWidth).toBe(RASTER_WIDTH)
24	expect(geo.render.gridHeight).toBe(RASTER_HEIGHT)
25	})
26
27	it('agrees on what black and white mean in the height map', () => {
28	expect(geo.render.minHeightM).toBe(RASTER_MIN_HEIGHT_M)
29	expect(geo.render.maxHeightM).toBe(RASTER_MAX_HEIGHT_M)
30	})
31
32	/**
33	* The range is declared rather than fitted so the raster keeps its meaning as the
34	* geography is edited. That only works if it actually contains the terrain, so
35	* check it still does — the generator warns, but nobody watches a build log.
36	*/
37	it('still covers the terrain it is meant to cover', () => {
38	// The extremes the generator last measured. These are a second line of defence
39	// and a weak one — they are numbers written down when they were true, not the
40	// terrain that came out of the most recent run, so they cannot notice the
41	// geography growing past them. `npm run terrain` now exits non-zero when a
42	// pixel is clamped, which is the check that actually holds.
43	expect(RASTER_MIN_HEIGHT_M).toBeLessThanOrEqual(-521)
44	expect(RASTER_MAX_HEIGHT_M).toBeGreaterThanOrEqual(4381)
45	})
46
47	it('agrees on where the map is cut', () => {
48	expect(geo.render.mapThetaOrigin).toBeCloseTo(MAP_CUT_WITHOUT_SLATS, 6)
49	})
50	})