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A chart to represent time-series data using multiple vertically layered horizon area plots
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README.md

Horizon Time-series Chart

NPM package Build Size Dependencies

An interactive vertically stacked horizon chart to represent time-series data.

For more information on the Horizon visual representation method, please see d3-horizon.

NPM

Check out the examples:

Quick start

import HorizonTSChart from 'horizon-timeseries-chart';

or

HorizonTSChart = require('horizon-timeseries-chart');

or even

<script src="//unpkg.com/horizon-timeseries-chart"></script>

then

const myChart = HorizonTSChart();
myChart
    .data(<myData>)
    (<myDOMElement>);

API reference

Method Description Default
width([px]) Getter/setter for the chart width. <window width>
height([px]) Getter/setter for the chart height. This height will be divided equally between all the vertically stacked series. <window height>
data([array]) Getter/setter for the chart data, as an array of data points. The syntax of each item is defined by the series, ts and val accessor methods. []
series([string or fn]) Getter/setter for the data point accessor function to extract the series. A function receives the data point as input and should return the unique series identifier. A string indicates the object attribute to use.
seriesComparator([fn(a, b)]) Getter/setter for the comparator function used to sort the series from top to bottom. The function should follow the signature function(seriesA, seriesB) and return a numeric value. (a, b) => a.localeCompare(b)
seriesLabelFormatter([fn(series)]) Getter/setter for the series label formatter function, used to show labels on the left-hand side of each series. The formatter should receive a series ID, as present in the data, and return a string. series => series
ts([string or fn]) Getter/setter for the data point accessor function to extract the x-axis timestamp. A function receives the data point as input and should return a number or a Date object indicating the point time. A string indicates the object attribute to use. ts
val([string or fn]) Getter/setter for the data point accessor function to extract the y-axis numeric value. A function receives the data point as input and should return a number. A string indicates the object attribute to use. val
useUtc([boolean]) Getter/setter for whether to consider and represent time using the local timezone (false) or in UTC (true). false
use24h([boolean]) Getter/setter for whether to show time in 24h or 12h (am/pm) format. true
horizonBands([number]) Getter/setter for the number of horizon bands to use. 4
horizonMode(['offset' or 'mirror']) Getter/setter for the mode used to represent negative values. offset renders the negative values from the top of the chart downwards, while mirror represents them upwards as if they were positive values, albeit with a different color. offset
yNormalize([boolean]) Getter/setter for whether to normalize all series Y axis to the same extent, in order to compare series in absolute terms. It defines the behavior of the dynamic calculation of the max Y, when yExtent is not explicitly set. If true, the extent is calculated as the global maximum value of all the data points combined across all series. If false, each series extent will be based on their own local maximum. false
yExtent([number or fn]) Getter/setter for the series accessor function to set the y-axis maximum absolute value. By default (undefined), the max Y is calculated dynamically from the data. A function receives the series ID as input and should return a numeric value. A number sets the same extent for all the series. undefined
yScaleExp([number or fn]) Getter/setter for the series accessor function to set the y-axis scale exponent. Only values > 0 are supported. An exponent of 1 (default) represents a linear Y scale. A function receives the series ID as input and should return a numeric value. A number sets the same scale exponent for all the series. 1
yAggregation([fn([numbers])]) Getter/setter for the method to reduce multiple values to a single number, in case there is more than one y value per unique ts and series. vals => vals.reduce((a,b) => a+b) (accumulate)
positiveColors([[colors] or fn]) Getter/setter for the series accessor function to set the colors to use for the positive value bands. The top band gets assigned the max color, and the other bands are colored according to the interpolation of the color stops. Minimum two colors are required. ['white', 'midnightBlue']
positiveColorStops([[stopNumbers] or fn]) Getter/setter for the series accessor function to set the stop values to use in the interpolation of the positive colors. Each stop represents an interpolation ratio and only values between ]0, 1[ (excluding) are permitted. The stops are used to interpolate the middle colors in positiveColors and are only applicable if there are more than 2 colors. If the number of stops is less than number of middle colors, linear interpolation is used to populate the remaining stops. A value of undefined (default) results in complete linear interpolation. undefined
negativeColors([[colors] or fn]) Getter/setter for the series accessor function to set the colors to use for the negative value bands. The top band gets assigned the max color, and the other bands are colored according to the interpolation of the color stops. Minimum two colors are required. ['white', 'crimson']
negativeColorStops([[stopNumbers] or fn]) Getter/setter for the series accessor function to set the stop values to use in the interpolation of the negative colors. Each stop represents an interpolation ratio and only values between ]0, 1[ (excluding) are permitted. The stops are used to interpolate the middle colors in negativeColors and are only applicable if there are more than 2 colors. If the number of stops is less than number of middle colors, linear interpolation is used to populate the remaining stops. A value of undefined (default) results in complete linear interpolation. undefined
interpolationCurve([d3CurveFn]) Getter/setter for the interpolation curve function used to draw lines between points. Should be a d3 curve function. A falsy value sets linear interpolation (curveLinear). curveBasis
showRuler([boolean]) Getter/setter for whether to show a vertical ruler highlighting the closest time point across all series. true
enableZoom([boolean]) Getter/setter for whether to enable pointer-based zoom interactions on the chart, along the time (x-axis) dimension. false
transitionDuration([ms]) Getter/setter for the duration (in milliseconds) of the transitions between data states. 250
tooltipContent([fn({series, ts, val, points})]) Getter/setter for the tooltip content accessor function. Accepts plain-text or HTML. A value of null will permanently hide the tooltip. ({ series, ts, val }) => `${series}<br>${ts}: ${val}`
onHover([fn({x, y, points})]) Callback function for chart hover events. Gets triggered every time the mouse moves in/out of a different point hover area. Includes the point information as single argument, with x, y and points (list of all data points associated with the corresponding x value) data. If no point is in the x proximity of the mouse pointer, a value of null is returned instead. -
onClick([fn({x, y, points})]) Callback function for chart click events. Includes the currently hovered point information as single argument, with x, y and points (list of all data points associated with the corresponding x value) data. If no point is in the x proximity of the mouse pointer, a value of null is returned instead. -

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