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import { rgb } from "d3-color"
import { interpolate } from "d3-interpolate"
import { lastOfNonEmptyArray, clone } from "../../clientUtils/Util"
import { ColorSchemeInterface } from "./ColorConstants"
import { interpolateArray } from "./ColorUtils"
export class ColorScheme implements ColorSchemeInterface {
name: string
colorSets: Color[][]
singleColorScale: boolean
isDistinct: boolean
constructor(
name: string,
colorSets: Color[][],
singleColorScale?: boolean,
isDistinct?: boolean
) {
this.name = name
this.colorSets = []
this.singleColorScale = !!singleColorScale
this.isDistinct = !!isDistinct
colorSets.forEach((set) => (this.colorSets[set.length] = set))
}
improviseGradientFromShorter(
shortColors: Color[],
numColors: number
): Color[] {
const newColors = clone(shortColors)
while (newColors.length < numColors) {
for (let index = newColors.length - 1; index > 0; index -= 1) {
const startColor = rgb(newColors[index - 1])
const endColor = rgb(newColors[index])
const newColor = interpolate(startColor, endColor)(0.5)
newColors.splice(index, 0, newColor)
if (newColors.length >= numColors) break
}
}
return newColors
}
improviseGradientFromLonger(
knownColors: Color[],
numColors: number
): Color[] {
const newColors = []
const scale = interpolateArray(knownColors)
for (let index = 0; index < numColors; index++) {
newColors.push(scale(index / numColors))
}
return newColors
}
getGradientColors(numColors: number): Color[] {
const { colorSets } = this
if (colorSets[numColors]) return clone(colorSets[numColors])
const prevColors = clone(colorSets)
.reverse()
.find((set) => set && set.length < numColors)
if (prevColors)
return this.improviseGradientFromShorter(prevColors, numColors)
else
return this.improviseGradientFromLonger(
colorSets.find((set) => !!set) as Color[],
numColors
)
}
getDistinctColors(numColors: number): Color[] {
const { colorSets } = this
if (colorSets.length === 0) return []
if (colorSets[numColors]) return clone(colorSets[numColors])
if (numColors > colorSets.length - 1) {
// If more colors are wanted than we have defined, have to improvise
const colorSet = lastOfNonEmptyArray(colorSets)
return this.improviseGradientFromShorter(colorSet, numColors)
}
// We have enough colors but not a specific set for this number-- improvise from the closest longer set
for (let i = numColors; i < colorSets.length; i++) {
if (colorSets[i]) {
return colorSets[i].slice(0, numColors)
}
}
return []
}
getColors(numColors: number): Color[] {
return this.isDistinct
? this.getDistinctColors(numColors)
: this.getGradientColors(numColors)
}
getUniqValueColorMap(
uniqValues: any[],
inverseOrder?: boolean
): Map<number, string> {
const colors = this.getColors(uniqValues.length) || []
if (inverseOrder) colors.reverse()
// We want to display same values using the same color, e.g. two values of 100 get the same shade of green
// Therefore, we create a map from all possible (unique) values to the corresponding color
const colorByValue = new Map<number, Color>()
uniqValues.forEach((value, index) =>
colorByValue.set(value, colors[index])
)
return colorByValue
}
static fromObject(
name: string,
colorSets: { [key: string]: Color[] },
singleColorScale?: boolean
): ColorScheme {
const colorSetsArray: Color[][] = []
Object.keys(colorSets).forEach(
(numColors): string[] =>
(colorSetsArray[+numColors] = colorSets[numColors])
)
return new ColorScheme(name, colorSetsArray, singleColorScale)
}
}
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