Ordinal.js
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var zrUtil = require("zrender/lib/core/util");
var Scale = require("./Scale");
var OrdinalMeta = require("../data/OrdinalMeta");
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/**
* Linear continuous scale
* @module echarts/coord/scale/Ordinal
*
* http://en.wikipedia.org/wiki/Level_of_measurement
*/
// FIXME only one data
var scaleProto = Scale.prototype;
var OrdinalScale = Scale.extend({
type: 'ordinal',
/**
* @param {module:echarts/data/OrdianlMeta|Array.<string>} ordinalMeta
*/
init: function (ordinalMeta, extent) {
// Caution: Should not use instanceof, consider ec-extensions using
// import approach to get OrdinalMeta class.
if (!ordinalMeta || zrUtil.isArray(ordinalMeta)) {
ordinalMeta = new OrdinalMeta({
categories: ordinalMeta
});
}
this._ordinalMeta = ordinalMeta;
this._extent = extent || [0, ordinalMeta.categories.length - 1];
},
parse: function (val) {
return typeof val === 'string' ? this._ordinalMeta.getOrdinal(val) // val might be float.
: Math.round(val);
},
contain: function (rank) {
rank = this.parse(rank);
return scaleProto.contain.call(this, rank) && this._ordinalMeta.categories[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) {
if (!this.isBlank()) {
// Note that if no data, ordinalMeta.categories is an empty array.
return this._ordinalMeta.categories[n];
}
},
/**
* @return {number}
*/
count: function () {
return this._extent[1] - this._extent[0] + 1;
},
/**
* @override
*/
unionExtentFromData: function (data, dim) {
this.unionExtent(data.getApproximateExtent(dim));
},
getOrdinalMeta: function () {
return this._ordinalMeta;
},
niceTicks: zrUtil.noop,
niceExtent: zrUtil.noop
});
/**
* @return {module:echarts/scale/Time}
*/
OrdinalScale.create = function () {
return new OrdinalScale();
};
var _default = OrdinalScale;
module.exports = _default;