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/* *
*
* (c) 2010-2019 Kacper Madej
*
* License: www.highcharts.com/license
*
* */
'use strict';
import H from '../parts/Globals.js';
import '../parts/Utilities.js';
var isArray = H.isArray,
seriesType = H.seriesType;
// Utils:
function accumulateAverage(points, xVal, yVal, i, index) {
var xValue = xVal[i],
yValue = index < 0 ? yVal[i] : yVal[i][index];
points.push([xValue, yValue]);
}
function weightedSumArray(array, pLen) {
// The denominator is the sum of the number of days as a triangular number.
// If there are 5 days, the triangular numbers are 5, 4, 3, 2, and 1.
// The sum is 5 + 4 + 3 + 2 + 1 = 15.
var denominator = (pLen + 1) / 2 * pLen;
// reduce VS loop => reduce
return array.reduce(function (prev, cur, i) {
return [null, prev[1] + cur[1] * (i + 1)];
})[1] / denominator;
}
function populateAverage(points, xVal, yVal, i) {
var pLen = points.length,
wmaY = weightedSumArray(points, pLen),
wmaX = xVal[i - 1];
points.shift(); // remove point until range < period
return [wmaX, wmaY];
}
/**
* The SMA series type.
*
* @private
* @class
* @name Highcharts.seriesTypes.wma
*
* @augments Highcharts.Series
*/
seriesType(
'wma',
'sma',
/**
* Weighted moving average indicator (WMA). This series requires `linkedTo`
* option to be set.
*
* @sample stock/indicators/wma
* Weighted moving average indicator
*
* @extends plotOptions.sma
* @since 6.0.0
* @product highstock
* @optionparent plotOptions.wma
*/
{
params: {
index: 3,
period: 9
}
},
/**
* @lends Highcharts.Series#
*/
{
getValues: function (series, params) {
var period = params.period,
xVal = series.xData,
yVal = series.yData,
yValLen = yVal ? yVal.length : 0,
range = 1,
xValue = xVal[0],
yValue = yVal[0],
WMA = [],
xData = [],
yData = [],
index = -1,
i, points, WMAPoint;
if (xVal.length < period) {
return false;
}
// Switch index for OHLC / Candlestick
if (isArray(yVal[0])) {
index = params.index;
yValue = yVal[0][index];
}
// Starting point
points = [[xValue, yValue]];
// Accumulate first N-points
while (range !== period) {
accumulateAverage(points, xVal, yVal, range, index);
range++;
}
// Calculate value one-by-one for each period in visible data
for (i = range; i < yValLen; i++) {
WMAPoint = populateAverage(points, xVal, yVal, i);
WMA.push(WMAPoint);
xData.push(WMAPoint[0]);
yData.push(WMAPoint[1]);
accumulateAverage(points, xVal, yVal, i, index);
}
WMAPoint = populateAverage(points, xVal, yVal, i);
WMA.push(WMAPoint);
xData.push(WMAPoint[0]);
yData.push(WMAPoint[1]);
return {
values: WMA,
xData: xData,
yData: yData
};
}
}
);
/**
* A `WMA` series. If the [type](#series.wma.type) option is not specified, it
* is inherited from [chart.type](#chart.type).
*
* @extends series,plotOptions.wma
* @since 6.0.0
* @product highstock
* @excluding dataParser, dataURL
* @apioption series.wma
*/