en/builder/src/echarts3/scale/Ordinal.js

/**
 * Linear continuous scale
 * @module echarts/coord/scale/Ordinal
 *
 * http://en.wikipedia.org/wiki/Level_of_measurement
 */
// FIXME only one data
import * as zrUtil from 'zrender/src/core/util';
import Scale from './Scale';
var scaleProto = Scale.prototype;
var OrdinalScale = Scale.extend({
  type: 'ordinal',
  init: function (data, extent) {
    this._data = data;
    this._extent = extent || [0, data.length - 1];
  },
  parse: function (val) {
    return typeof val === 'string' ? zrUtil.indexOf(this._data, val) // val might be float.
    : Math.round(val);
  },
  contain: function (rank) {
    rank = this.parse(rank);
    return scaleProto.contain.call(this, rank) && this._data[rank] != null;
  },

  /**
   * Normalize given rank or name to linear [0, 1]
   * @param {number|string} [val]
   * @return {number}
   */
  normalize: function (val) {
    return scaleProto.normalize.call(this, this.parse(val));
  },
  scale: function (val) {
    return Math.round(scaleProto.scale.call(this, val));
  },

  /**
   * @return {Array}
   */
  getTicks: function () {
    var ticks = [];
    var extent = this._extent;
    var rank = extent[0];

    while (rank <= extent[1]) {
      ticks.push(rank);
      rank++;
    }

    return ticks;
  },

  /**
   * Get item on rank n
   * @param {number} n
   * @return {string}
   */
  getLabel: function (n) {
    return this._data[n];
  },

  /**
   * @return {number}
   */
  count: function () {
    return this._extent[1] - this._extent[0] + 1;
  },

  /**
   * @override
   */
  unionExtentFromData: function (data, dim) {
    this.unionExtent(data.getDataExtent(dim, false));
  },
  niceTicks: zrUtil.noop,
  niceExtent: zrUtil.noop
});
/**
 * @return {module:echarts/scale/Time}
 */

OrdinalScale.create = function () {
  return new OrdinalScale();
};

export default OrdinalScale;