laue/src/utils/math.js

Modern charts for Vue.js

import {tickStep} from 'd3-array/src/ticks'
import {isNum} from './core'

export function int(str) {
  return parseInt(str, 10)
}

/**
 * Returns nick ticks
 */
export function genTicks(min, max, count) {
  if (max < min) {
    [min, max] = [max, min]
  }

  if (min === 0 && max === 0) {
    return [0]
  }

  const step = tickStep(min, max, count)
  const first = Math.floor(min / step) * step
  const ticks = [first]
  let cur = first

  while (cur < max) {
    cur += step
    ticks.push(cur)
  }

  if (Math.abs(min - ticks[1]) < step) {
    ticks.shift()
    ticks[0] = min
  }

  if (Math.abs(max - ticks[ticks.length - 2]) < step) {
    ticks.pop()
    ticks[ticks.length - 1] = max
  }

  return ticks
}

export function genExactNbTicks(min, max, count) {
  const diff = max - min
  const step = diff / (count - 1)
  const ticks = []

  for (let i = 0; i < count; i++) {
    ticks.push(i * step)
  }

  ticks.push(max)

  return ticks
}

export function sum(arr) {
  return arr.reduce((a, b) => a + b, 0)
}

export function bound(data, type, key) {
  return Math[type](
    ...data.map(arr => Math[type](...arr.map(item => item[key]).filter(isNum)))
  )
}