| import type { Sky, Telescope } from "./types"; |
| import { moveEquatorial } from "./projection"; |
| import { equatorialToHorizontal, horizontalToEquatorial } from "./sky"; |
|
|
| export function stopTelescope(t: Telescope, sky: Sky): Telescope { |
| const h = equatorialToHorizontal(t.ra, t.dec, sky.time, sky.site); |
| return { |
| ...t, |
| moving: false, |
| tracking: false, |
| targetId: null, |
| targetRa: t.ra, |
| targetDec: t.dec, |
| holdAz: h.az, |
| holdAlt: h.alt, |
| }; |
| } |
|
|
| export function advanceTelescope( |
| t: Telescope, |
| seconds: number, |
| sky: Sky, |
| ): Telescope { |
| if (!t.connected) return t; |
| |
| if ( |
| !t.tracking && |
| !t.moving && |
| t.holdAz !== undefined && |
| t.holdAlt !== undefined |
| ) { |
| const e = horizontalToEquatorial(t.holdAz, t.holdAlt, sky.time, sky.site); |
| return Math.abs(e.ra - t.ra) + Math.abs(e.dec - t.dec) < 1e-8 |
| ? t |
| : { ...t, ...e }; |
| } |
| const object = t.targetId ? sky.byId.get(t.targetId) : undefined; |
| const ra = object && t.tracking ? object.ra : t.targetRa; |
| const dec = object && t.tracking ? object.dec : t.targetDec; |
| if (t.moving) { |
| const step = moveEquatorial(t.ra, t.dec, ra, dec, 2 * Math.max(0, seconds)); |
| return { |
| ...t, |
| ra: step.ra, |
| dec: step.dec, |
| targetRa: ra, |
| targetDec: dec, |
| moving: !step.arrived, |
| }; |
| } |
| if ( |
| object && |
| t.tracking && |
| Math.abs(ra - t.ra) + Math.abs(dec - t.dec) > 1e-8 |
| ) |
| return { ...t, ra, dec, targetRa: ra, targetDec: dec }; |
| return t; |
| } |
|
|
