@niivue/niivue/src/utils/nice.ts

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export const nice = (x: number, round: boolean): number => {
    const exp = Math.floor(Math.log(x) / Math.log(10))
    const f = x / Math.pow(10, exp)
    let nf
    if (round) {
        if (f < 1.5) {
            nf = 1
        } else if (f < 3) {
            nf = 2
        } else if (f < 7) {
            nf = 5
        } else {
            nf = 10
        }
    } else {
        if (f <= 1) {
            nf = 1
        } else if (f <= 2) {
            nf = 2
        } else if (f <= 5) {
            nf = 5
        } else {
            nf = 10
        }
    }
    return nf * Math.pow(10, exp)
}