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/**
* @license @product.name@ JS v@product.version@ (@product.date@)
*
* (c) 2010-2017 Highsoft AS
* Author: Sebastian Domas
*
* License: www.highcharts.com/license
*/
'use strict';
import H from '../parts/Globals.js';
import derivedSeriesMixin from '../mixins/derived-series.js';
var objectEach = H.objectEach,
seriesType = H.seriesType,
correctFloat = H.correctFloat,
isNumber = H.isNumber,
arrayMax = H.arrayMax,
arrayMin = H.arrayMin,
merge = H.merge;
/* ***************************************************************************
*
* HISTOGRAM
*
**************************************************************************** */
/**
* A dictionary with formulas for calculating number of bins based on the
* base series
**/
var binsNumberFormulas = {
'square-root': function (baseSeries) {
return Math.ceil(Math.sqrt(baseSeries.options.data.length));
},
'sturges': function (baseSeries) {
return Math.ceil(Math.log(baseSeries.options.data.length) * Math.LOG2E);
},
'rice': function (baseSeries) {
return Math.ceil(2 * Math.pow(baseSeries.options.data.length, 1 / 3));
}
};
/**
* Returns a function for mapping number to the closed (right opened) bins
*
* @param {number} binWidth - width of the bin
* @returns {function}
**/
function fitToBinLeftClosed(bins) {
return function (y) {
var i = 1;
while (bins[i] <= y) {
i++;
}
return bins[--i];
};
}
/**
* Histogram class
*
* @constructor seriesTypes.histogram
* @augments seriesTypes.column
* @mixes DerivedSeriesMixin
**/
/**
* A histogram is a column series which represents the distribution of the data
* set in the base series. Histogram splits data into bins and shows their
* frequencies.
*
* @product highcharts
* @sample {highcharts} highcharts/demo/histogram/ Histogram
* @since 6.0.0
* @extends plotOptions.column
* @excluding boostThreshold, pointInterval, pointIntervalUnit, stacking
* @optionparent plotOptions.histogram
**/
seriesType('histogram', 'column', {
/**
* A preferable number of bins. It is a suggestion, so a histogram may have
* a different number of bins. By default it is set to the square root
* of the base series' data length. Available options are: `square-root`,
* `sturges`, `rice`. You can also define a function which takes a
* `baseSeries` as a parameter and should return a positive integer.
*
* @type {String|Number|Function}
* @validvalue ["square-root", "sturges", "rice"]
*/
binsNumber: 'square-root',
/**
* Width of each bin. By default the bin's width is calculated as
* `(max - min) / number of bins`. This option takes precedence over
* [binsNumber](#plotOptions.histogram.binsNumber).
*
* @type {Number}
*/
binWidth: undefined,
pointPadding: 0,
groupPadding: 0,
grouping: false,
pointPlacement: 'between',
tooltip: {
headerFormat: '',
pointFormat: '<span style="font-size: 10px">{point.x} - {point.x2}' +
'</span><br/>' +
'<span style="color:{point.color}">\u25CF</span>' +
' {series.name} <b>{point.y}</b><br/>'
}
}, merge(derivedSeriesMixin, {
setDerivedData: function () {
var data = this.derivedData(
this.baseSeries.yData,
this.binsNumber(),
this.options.binWidth
);
this.setData(data, false);
},
derivedData: function (baseData, binsNumber, binWidth) {
var series = this,
max = arrayMax(baseData),
// Float correction needed, because first frequency value is not
// corrected when generating frequencies (within for loop).
min = correctFloat(arrayMin(baseData)),
frequencies = [],
bins = {},
data = [],
x,
fitToBin;
binWidth = series.binWidth = series.options.pointRange = correctFloat(
isNumber(binWidth) ?
(binWidth || 1) :
(max - min) / binsNumber
);
// If binWidth is 0 then max and min are equaled,
// increment the x with some positive value to quit the loop
for (
x = min;
// This condition is needed because of the margin of error while
// operating on decimal numbers. Without that, additional bin was
// sometimes noticeable on the graph, because of too small precision
// of float correction.
x < max &&
(
series.userOptions.binWidth ||
correctFloat(max - x) >= binWidth ||
correctFloat(min + (frequencies.length * binWidth) - x) <= 0
);
x = correctFloat(x + binWidth)
) {
frequencies.push(x);
bins[x] = 0;
}
if (bins[min] !== 0) {
frequencies.push(correctFloat(min));
bins[correctFloat(min)] = 0;
}
fitToBin = fitToBinLeftClosed(
frequencies.map(function (elem) {
return parseFloat(elem);
})
);
baseData.forEach(function (y) {
var x = correctFloat(fitToBin(y));
bins[x]++;
});
objectEach(bins, function (frequency, x) {
data.push({
x: Number(x),
y: frequency,
x2: correctFloat(Number(x) + binWidth)
});
});
data.sort(function (a, b) {
return a.x - b.x;
});
return data;
},
binsNumber: function () {
var binsNumberOption = this.options.binsNumber;
var binsNumber = binsNumberFormulas[binsNumberOption] ||
// #7457
(typeof binsNumberOption === 'function' && binsNumberOption);
return Math.ceil(
(binsNumber && binsNumber(this.baseSeries)) ||
(
isNumber(binsNumberOption) ?
binsNumberOption :
binsNumberFormulas['square-root'](this.baseSeries)
)
);
}
}));
/**
* A `histogram` series. If the [type](#series.histogram.type) option is not
* specified, it is inherited from [chart.type](#chart.type).
*
* @type {Object}
* @since 6.0.0
* @extends series,plotOptions.histogram
* @excluding dataParser,dataURL,data
* @product highcharts
* @apioption series.histogram
*/
/**
* An integer identifying the index to use for the base series, or a string
* representing the id of the series.
*
* @type {Number|String}
* @default undefined
* @apioption series.histogram.baseSeries
*/
/**
* An array of data points for the series. For the `histogram` series type,
* points are calculated dynamically. See
* [histogram.baseSeries](#series.histogram.baseSeries).
*
* @type {Array<Object|Array>}
* @since 6.0.0
* @extends series.column.data
* @product highcharts
* @apioption series.histogram.data
*/