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Interpolate also alpha channel

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Guntis Smaukstelis
2025-06-05 22:27:43 +03:00
parent 011ea8fb08
commit 87971906cf
3 changed files with 8 additions and 9 deletions
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web/src/helpers/interpolateColors.ts
+4 -5
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@@ -1,16 +1,15 @@
import { ColorEntry } from '../pages/harmonie/draw/constants'
type RGBu8 = [number, number, number]
type RGBAu8 = [number, number, number, number]
export function interpolateColors(value: number, a: RGBu8, b: RGBu8): RGBAu8 {
export function interpolateColors(value: number, a: RGBAu8, b: RGBAu8): RGBAu8 {
const color = a.slice(0).map((from, i) => {
const to = b[i]
const delta = (to - from) * (value/255)
return from + delta
})
return [...color, 255] as RGBAu8
return [...color] as RGBAu8
}
export function valueToColorThreshold(value: number, colorArr: ColorEntry[]): [number, number, number, number] {
@@ -37,8 +36,8 @@ export function valueToColorInterpolated(value: number, colorArr: ColorEntry[]):
}
}
const maxDeg = closeMax.color.slice(0, 3) as [number, number, number]
const minDeg = closeMin.color.slice(0, 3) as [number, number, number]
const maxDeg = closeMax.color
const minDeg = closeMin.color
const scale = Math.abs(closeMax.value - closeMin.value)
const delta = 255*(value - closeMin.value)/scale
const rgba = interpolateColors(delta, minDeg, maxDeg)