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add comments to the code

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Spedon
2023-03-14 01:49:35 +08:00
parent 5076455acd
commit f1820a851c
4 changed files with 17 additions and 1 deletions
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4
assets/ts/trackMouse.ts
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@@ -29,6 +29,7 @@ let globalIndex: number = 0
// last position set as "activated"
let last: position = { x: 0, y: 0 }
// activate top image
const activate = (index: number, x: number, y: number): void => {
const img = document.createElement('img')
img.setAttribute('src', imagesArray[index].url)
@@ -63,10 +64,12 @@ const activate = (index: number, x: number, y: number): void => {
last = { x, y }
}
// Compare the current mouse position with the last activated position
const distanceFromLast = (x: number, y: number): number => {
return Math.hypot(x - last.x, y - last.y)
}
// handle mouse move
export const handleOnMove = (e: MouseEvent): void => {
// meet threshold
if (
@@ -83,6 +86,7 @@ export const handleOnMove = (e: MouseEvent): void => {
}
}
// initialization
export function trackMouseInit(): void {
window.addEventListener('mousemove', handleOnMove)
}