@dickyindra/klinecharts/lib/technicalindicator/directionalmovement/differentOfMovingAverage.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.
 */

/**
 * DMA
 * 公式：DIF:MA(CLOSE,N1)-MA(CLOSE,N2);DIFMA:MA(DIF,M)
 */
var _default = {
  name: 'DMA',
  shortName: 'DMA',
  calcParams: [10, 50, 10],
  plots: [{
    key: 'dma',
    title: 'DMA: ',
    type: 'line'
  }, {
    key: 'ama',
    title: 'AMA: ',
    type: 'line'
  }],
  calcTechnicalIndicator: function calcTechnicalIndicator(dataList, _ref) {
    var params = _ref.params;
    var maxPeriod = Math.max(params[0], params[1]);
    var closeSum1 = 0;
    var closeSum2 = 0;
    var dmaSum = 0;
    var result = [];
    dataList.forEach(function (kLineData, i) {
      var dma = {};
      var close = kLineData.close;
      closeSum1 += close;
      closeSum2 += close;
      var ma1;
      var ma2;

      if (i >= params[0] - 1) {
        ma1 = closeSum1 / params[0];
        closeSum1 -= dataList[i - (params[0] - 1)].close;
      }

      if (i >= params[1] - 1) {
        ma2 = closeSum2 / params[1];
        closeSum2 -= dataList[i - (params[1] - 1)].close;
      }

      if (i >= maxPeriod - 1) {
        var dif = ma1 - ma2;
        dma.dma = dif;
        dmaSum += dif;

        if (i >= maxPeriod + params[2] - 2) {
          dma.ama = dmaSum / params[2];
          dmaSum -= result[i - (params[2] - 1)].dma;
        }
      }

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