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black-black-cat/backup.js

Last active May 10, 2019 08:03
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getCursor
Raw
backup.js
console.log('Hello World!');
/**
*
* @param {string|number} direIndex direction name or direction index
* @param {number} [angle]
*
*/
function getCursor (direIndex, angle = 0) {
let direNames = ['n', 'ne', 'e', 'se', 's', 'sw', 'w', 'nw']
let j = direNames.indexOf(direIndex)
if (j > -1) {
direIndex = j
}
let parts = buildParts(45)
angle = handleAngle(angle, -45/2)
let partIndex = 0;
parts.some((part, i) => {
let yes = angle >= part[0] && angle < part[1]
if (yes) {
partIndex = i
}
return yes
})
let nameIndex = (direIndex + partIndex) % 8
return direNames[nameIndex]
}
// parts
// [
// [-22.5, 22.5],
// ...
// ]
function buildParts (piece = 45) {
let len = 8
let arr = []
for (let i = 0; i < len; i++) {
arr.push([i * piece - piece / 2, (i + 1) * piece - piece / 2])
}
// arr[0][1] -= piece / 2
// arr[len] = [len * piece, len * piece + piece / 2]
return arr
}
function handleAngle (angle, offset) {
angle %= 360
if (angle < 0 && angle > offset) {
return angle
}
if (angle < 0) {
angle += 360
}
return angle
}
log = console.log.bind(null)
log(getCursor(7, -22.511111111111111111111111))
log(getCursor(7, 90))
log(getCursor(7,-90))
log(getCursor('nw', -90))
Raw
index.html
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>GistRun</title>
<link rel="stylesheet" href="styles.css">
</head>
<body>
<h1>Hello world!</h1>
<script src="script.js"></script>
</body>
</html>
Raw
script.js
console.log('Hello World!');
/**
*
* @param {string|number} direIndex direction name or direction index
* @param {number} [angle]
*
*/
function getCursor (direIndex, angle = 0) {
let direNames = ['n', 'ne', 'e', 'se', 's', 'sw', 'w', 'nw']
let j = direNames.indexOf(direIndex)
if (j > -1) {
direIndex = j
}
angle = handleAngle(angle)
let partIndex = 0
let int = Math.floor(angle / 22.5)
let parts = buildParts()
parts.some((part, i) => {
let yes = part.indexOf(int) > -1
if (yes) {
partIndex = i
}
return yes
})
let nameIndex = (direIndex + partIndex) % 8
return direNames[nameIndex]
}
function buildParts () {
let arr = []
let len = 16
for (i = 0; i < len; i += 2) {
let p = i - 1
if (p < 0) {
p = len - 1
}
arr.push([p, i])
}
return arr
}
function handleAngle (angle) {
angle %= 360
if (angle < 0) {
angle += 360
}
return angle
}
log = console.log.bind(null)
log(getCursor(7, -22.511111111111111111111111))
log(getCursor(7, 90))
log(getCursor(7,-90))
log(getCursor('nw', -90))
Raw
styles.css
/* todo: add styles */
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