tower / files / src / ui / scales.ts

scales.ts

Blame: the commit that last changed each line · file · history

`7cc177f6` 2026-09-07 Pavel Safronov	1	/**
	2	* Slider mappings shared by the panel and the views.
	3	*
	4	* This lives outside views/ on purpose: the panel needs the eye-height scale to
	5	* label its slider before the interior view exists, and importing the view for it
	6	* would statically pull Three.js into the entry chunk — the exact regression
	7	* D-021 fixed for the exterior.
	8	*/
	9
	10	/** Standing eye height. */
	11	export const EYE_MIN_M = 1.7
`3e898b51` 2026-09-28 Pavel Safronov	12	import { BEAM_RADIUS_M, RADIUS_M } from '../canon/constants.js'
	13
	14	/**
	15	* The edge of the beam, above the datum: as high as anyone can go (D-084). The whole world
	16	* seen as a tube from inside its air (world-generation.md §6.4), with the beam filling the
	17	* sky overhead. It was 45 km, 3.4 km short of it, until the author asked for the beam to be
	18	* the top of the eye-height gauge. The interior stops you a little short of it, over
	19	* whatever ground you are above.
	20	*/
	21	export const EYE_MAX_M = RADIUS_M - BEAM_RADIUS_M
`7cc177f6` 2026-09-07 Pavel Safronov	22
	23	/** Eye height from a 0..1 slider position. Logarithmic, so 1.7 m is reachable. */
	24	export const eyeHeightFromSlider = (v: number): number =>
	25	EYE_MIN_M * (EYE_MAX_M / EYE_MIN_M) ** Math.min(1, Math.max(0, v))
	26
	27	export const sliderFromEyeHeight = (h: number): number =>
	28	Math.log(Math.max(EYE_MIN_M, h) / EYE_MIN_M) / Math.log(EYE_MAX_M / EYE_MIN_M)