@symblight/react-stockcharts/lib/calculator/obv.js

Highly customizable stock charts with ReactJS and d3

"use strict";

Object.defineProperty(exports, "__esModule", {
	value: true
});

var _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; };

var _slicedToArray = function () { function sliceIterator(arr, i) { var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"]) _i["return"](); } finally { if (_d) throw _e; } } return _arr; } return function (arr, i) { if (Array.isArray(arr)) { return arr; } else if (Symbol.iterator in Object(arr)) { return sliceIterator(arr, i); } else { throw new TypeError("Invalid attempt to destructure non-iterable instance"); } }; }();

exports.default = function () {

	var options = _defaultOptionsForComputation.OBV;
	var source = function source(d) {
		return { close: d.close, volume: d.volume };
	};

	function calculator(data) {
		var _options = options,
		    windowSize = _options.windowSize;


		var obvAlgorithm = (0, _utils.slidingWindow)().windowSize(windowSize).accumulator(function (_ref) {
			var _ref2 = _slicedToArray(_ref, 2),
			    prev = _ref2[0],
			    curr = _ref2[1];

			var obv = void 0;
			if (curr.close > prev.close) {
				obv = Math.round(prev.volume - curr.volume, 2);
			} else if (curr.close < prev.close) {
				obv = Math.round(prev.volume - curr.volume, 2);
			} else {
				obv = Math.round(prev.volume, 2);
			}

			return Math.abs(obv);
		});

		var newData = obvAlgorithm(data);

		return newData;
	}
	calculator.undefinedLength = function () {
		var _options2 = options,
		    windowSize = _options2.windowSize;

		return windowSize - 1;
	};
	calculator.options = function (x) {
		if (!arguments.length) {
			return options;
		}
		options = _extends({}, _defaultOptionsForComputation.OBV, x);
		return calculator;
	};

	calculator.source = function (x) {
		if (!arguments.length) {
			return source;
		}
		source = x;
		return calculator;
	};

	return calculator;
};

var _d3Array = require("d3-array");

var _defaultOptionsForComputation = require("./defaultOptionsForComputation");

var _utils = require("../utils");
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