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export const calculateChange = (e, direction, hsl, container) => {
const containerWidth = container.clientWidth
const containerHeight = container.clientHeight
const x = typeof e.pageX === 'number' ? e.pageX : e.touches[0].pageX
const y = typeof e.pageY === 'number' ? e.pageY : e.touches[0].pageY
const left = x - (container.getBoundingClientRect().left + window.pageXOffset)
const top = y - (container.getBoundingClientRect().top + window.pageYOffset)
if (direction === 'vertical') {
let h
if (top < 0) {
h = 359
} else if (top > containerHeight) {
h = 0
} else {
const percent = -((top * 100) / containerHeight) + 100
h = ((360 * percent) / 100)
}
if (hsl.h !== h) {
return {
h,
s: hsl.s,
l: hsl.l,
a: hsl.a,
source: 'hsl',
}
}
} else {
let h
if (left < 0) {
h = 0
} else if (left > containerWidth) {
h = 359
} else {
const percent = (left * 100) / containerWidth
h = ((360 * percent) / 100)
}
if (hsl.h !== h) {
return {
h,
s: hsl.s,
l: hsl.l,
a: hsl.a,
source: 'hsl',
}
}
}
return null
}
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