blog/public/plugin/c3-0.7.20/src/format.ts

import { ChartInternal } from './core'
import { isValue } from './util'

ChartInternal.prototype.getYFormat = function(forArc) {
  var $$ = this,
    formatForY =
      forArc && !$$.hasType('gauge') ? $$.defaultArcValueFormat : $$.yFormat,
    formatForY2 =
      forArc && !$$.hasType('gauge') ? $$.defaultArcValueFormat : $$.y2Format
  return function(v, ratio, id) {
    var format = $$.axis.getId(id) === 'y2' ? formatForY2 : formatForY
    return format.call($$, v, ratio)
  }
}
ChartInternal.prototype.yFormat = function(v) {
  var $$ = this,
    config = $$.config,
    format = config.axis_y_tick_format
      ? config.axis_y_tick_format
      : $$.defaultValueFormat
  return format(v)
}
ChartInternal.prototype.y2Format = function(v) {
  var $$ = this,
    config = $$.config,
    format = config.axis_y2_tick_format
      ? config.axis_y2_tick_format
      : $$.defaultValueFormat
  return format(v)
}
ChartInternal.prototype.defaultValueFormat = function(v) {
  return isValue(v) ? +v : ''
}
ChartInternal.prototype.defaultArcValueFormat = function(v, ratio) {
  return (ratio * 100).toFixed(1) + '%'
}
ChartInternal.prototype.dataLabelFormat = function(targetId) {
  var $$ = this,
    data_labels = $$.config.data_labels,
    format,
    defaultFormat = function(v) {
      return isValue(v) ? +v : ''
    }
  // find format according to axis id
  if (typeof data_labels.format === 'function') {
    format = data_labels.format
  } else if (typeof data_labels.format === 'object') {
    if (data_labels.format[targetId]) {
      format =
        data_labels.format[targetId] === true
          ? defaultFormat
          : data_labels.format[targetId]
    } else {
      format = function() {
        return ''
      }
    }
  } else {
    format = defaultFormat
  }
  return format
}