@dickyindra/klinecharts/lib/technicalindicator/directionalmovement/easeOfMovementValue.js

Lightweight k-line chart built with html5 canvas

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

/**
 * Licensed 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.
 */

/**
 *
 * EMV 简易波动指标
 * 公式：
 * A=（今日最高+今日最低）/2
 * B=（前日最高+前日最低）/2
 * C=今日最高-今日最低
 * EM=（A-B）*C/今日成交额
 * EMV=N日内EM的累和
 * MAEMV=EMV的M日的简单移动平均
 *
 */
var _default = {
  name: 'EMV',
  shortName: 'EMV',
  calcParams: [14, 9],
  plots: [{
    key: 'emv',
    title: 'EMV: ',
    type: 'line'
  }, {
    key: 'maEmv',
    title: 'MAEMV: ',
    type: 'line'
  }],
  calcTechnicalIndicator: function calcTechnicalIndicator(dataList, _ref) {
    var params = _ref.params;
    var emSum = 0;
    var emvSum = 0;
    var emList = [];
    var result = [];
    dataList.forEach(function (kLineData, i) {
      var emv = {};
      var preKLineData = dataList[i - 1] || kLineData;
      var high = kLineData.high;
      var low = kLineData.low;
      var turnover = kLineData.turnover || 0;
      var halfHl = (high + low) / 2;
      var preHalfHl = (preKLineData.high + preKLineData.low) / 2;
      var hl = high - low;
      var em = 0;

      if (turnover !== 0) {
        em = (halfHl - preHalfHl) * hl / turnover;
      }

      emList.push(em);
      emSum += em;

      if (i >= params[0] - 1) {
        emv.emv = emSum;
        emSum -= emList[i - (params[0] - 1)];
        emvSum += emv.emv;

        if (i >= params[0] + params[1] - 2) {
          emv.maEmv = emvSum / params[1];
          emvSum -= result[i - (params[1] - 1)].emv;
        }
      }

      result.push(emv);
    });
    return result;
  }
};
exports.default = _default;