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Line Chart

line

<LineChart 
data={query_name}
x=column_x
y=column_y
/>

Examples

Line

line

<LineChart 
data={daily_complaints}
x=date
y=number_of_complaints
yAxisTitle="calls to Austin 311 per day"
/>

Multi-Series Line

multi-series-line

<LineChart 
data={daily_volume_yoy}
x=day_of_year
y=cum_vol
series=year
yAxisTitle="cumulative calls"
xAxisTitle="day of year"
/>

Multi-Series Line with Steps

<LineChart
data={simpler_bar}
x=year
y=value
series=country
step=true
/>

Multiple y Columns

multiple-y-line

<LineChart
data={fda_recalls}
x=year
y={["voluntary_recalls", "fda_recalls"]}
/>

Because x is the first column in the dataset and we want to plot all the remaining numerical columns in the table, we can simplify our code down to:

<LineChart data={fda_recalls}/>

Evidence will automatically pick the first column as x and use all other numerical columns for y.

Props

Data

Name Description Required? Options Default
data Query name, wrapped in curly braces Yes query name -
x Column to use for the x-axis of the chart Yes column name First column
y Column(s) to use for the y-axis of the chart Yes column name | array of column names Any non-assigned numeric columns
sort Whether to apply default sort to your data. Default is x ascending for number and date x-axes, and y descending for category x-axes - true | false false
series Column to use as the series (groups) in a multi-series chart - column name -
handleMissing Treatment of missing values in the dataset - gap | connect | zero gap
xFmt Format to use for x column (see available formats) - Excel-style format | buil-in format name | custom format name -
yFmt Format to use for y column (see available formats) - Excel-style format | buil-in format name | custom format name -

Series

Name Description Required? Options Default
lineColor Color to override default series color. Only accepts a single color. - CSS name | hexademical | RGB | HSL -
lineOpacity % of the full color that should be rendered, with remainder being transparent - number (0 to 1) 1
lineType Options to show breaks in a line (dashed or dotted) - solid | dashed | dotted solid
lineWidth Thickness of line (in pixels) - number 2
markers Turn on/off markers (shapes rendered onto the points of a line) - true | false false
markerShape Shape to use if markers=true - circle | emptyCircle | rect | triangle | diamond circle
markerSize Size of each shape (in pixels) - number 8

Chart

Name Description Required? Options Default
title Chart title. Appears at top left of chart. - string -
subtitle Chart subtitle. Appears just under title. - string -
legend Turns legend on or off. Legend appears at top center of chart. - true | false true for multiple series
chartAreaHeight Minimum height of the chart area (excl. header and footer) in pixels. Adjusting the height affects all viewport sizes and may impact the mobile UX. - number 180
xAxisTitle Name to show under x-axis. If 'true', formatted column name is used. Only works with swapXY=false - true | string | false false
yAxisTitle Name to show beside y-axis. If 'true', formatted column name is used. - true | string | false false
xGridlines Turns on/off gridlines extending from x-axis tick marks (vertical lines when swapXY=false) - true | false false
yGridlines Turns on/off gridlines extending from y-axis tick marks (horizontal lines when swapXY=false) - true | false true
xAxisLabels Turns on/off value labels on the x-axis - true | false true
yAxisLabels Turns on/off value labels on the y-axis - true | false true
xBaseline Turns on/off thick axis line (line appears at y=0) - true | false true
yBaseline Turns on/off thick axis line (line appears directly alongside the y-axis labels) - true | false false
xTickMarks Turns on/off tick marks for each of the x-axis labels - true | false false
yTickMarks Turns on/off tick marks for each of the y-axis labels - true | false false
yMin Starting value for the y-axis - number -
yMax Maximum value for the y-axis - number -
step Specifies whether the chart is displayed as a step line. - true | false false
stepPosition Configures the position of turn points for a step line chart. - 'start' | 'middle' | 'end' 'end'

Annotations

Line charts can include annotations using the ReferenceLine and ReferenceArea components. These components are used within a chart component like so:

<LineChart data="{sales_data}" x="date" y="sales">
<ReferenceLine data="{target_data}" y="target" label="name" />
<ReferenceArea xMin="2020-03-14" xMax="2020-05-01" />
</LineChart>