https://github.com/michitaro/angle

https://github.com/michitaro/angle

angle coordinate-systems equatorial typescript

Last synced: 6 days ago
JSON representation

• Host: GitHub
• URL: https://github.com/michitaro/angle
• Owner: michitaro
• Created: 2017-08-07T05:26:12.000Z (over 7 years ago)
• Default Branch: master
• Last Pushed: 2019-03-05T07:40:08.000Z (over 5 years ago)
• Last Synced: 2024-10-12T19:51:48.975Z (about 1 month ago)
• Topics: angle, coordinate-systems, equatorial, typescript
• Language: TypeScript
• Size: 43 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

README

        
# Angle

Simple angle unit converter for TypeScript

## Install

```sh

npm install --save @hscmap/angle

```

## Example

```typescript

import { Angle, EquatorialCoord } from "@hscmap/angle"

function equal(a: number, b: number) {

    return Math.abs(a / b - 1) <= 1.e-6 || Math.abs((a - 1) / (b - 1) - 1) <= 1.e-6

}

function assertEqual(a: number, b: number) {

    console.assert(equal(a, b))

}

function assetArrayEqual(a: number[], b: number[]) {

    console.assert(a.every((c, i) => equal(c, b[i])))

}

assertEqual(Angle.fromRad(Math.PI / 4).deg, 45)

assertEqual(Angle.fromDeg(45).rad, Math.PI / 4)

assertEqual(Angle.fromAmin(60).deg, 1)

assertEqual(Angle.fromAsec(1).deg, 1 / 3600)

assertEqual(Angle.fromDeg(1).amin, 60)

assertEqual(Angle.fromDeg(1).asec, 3600)

!(function eq2xyz() {

    assetArrayEqual(EquatorialCoord.fromDeg(0, 0).xyz, [1, 0, 0])

    assetArrayEqual(EquatorialCoord.fromDeg(90, 0).xyz, [0, 1, 0])

    assetArrayEqual(EquatorialCoord.fromDeg(90, 90).xyz, [0, 0, 1])

    assetArrayEqual(EquatorialCoord.fromDeg(0, -45).xyz, [Math.SQRT1_2, 0, -Math.SQRT1_2])

    assetArrayEqual(EquatorialCoord.fromDeg(-45, -45).xyz, [1 / 2, - 1 / 2, -Math.SQRT1_2])

})()

!(function xyz2eq() {

    function assertADEqual(eq: EquatorialCoord, a: Angle, d: Angle) {

        assetArrayEqual([eq.a.rad, eq.d.rad], [a.rad, d.rad])

    }

    assertADEqual(EquatorialCoord.fromXyz([1, 0, 0]), Angle.fromDeg(0), Angle.fromDeg(0))

    assertADEqual(EquatorialCoord.fromXyz([0, 1, 0]), Angle.fromDeg(90), Angle.fromDeg(0))

    assertADEqual(EquatorialCoord.fromXyz([0, 0, 1]), Angle.fromDeg(0), Angle.fromDeg(90))

    assertADEqual(EquatorialCoord.fromXyz([Math.SQRT1_2, 0, -Math.SQRT1_2]), Angle.fromDeg(0), Angle.fromDeg(-45))

    assertADEqual(EquatorialCoord.fromXyz([1/2, -1/2, -Math.SQRT1_2]), Angle.fromDeg(315), Angle.fromDeg(-45))

})()

!(function simple_coord_parse() {

    const eq = EquatorialCoord.parse(`29 41`)

    assertEqual(eq.a.deg, 29)

    assertEqual(eq.d.deg, 41)

})()

!(function m81_coord_parse() {

    const eq = EquatorialCoord.parse(`(RA, α) 09h 55m 33.17306s (Dec, δ) +69° 03′ 55.0610″`)

    assertEqual(eq.a.deg, 148.88822108386302)

    assertEqual(eq.d.deg, 69.06529472246791)

})()

!(function m81_coord_unparse() {

    const eq = EquatorialCoord.parse(`(RA, α) 09h 55m 33.17306s (Dec, δ) +69° 03′ 55.0610″`)

    const { a, d } = eq.toString()

    console.assert(a == '09:55:33.1731')

    console.assert(d == '+69:03:55.0610')

})()

```