The Line mark plots a line element by taking two or more x/y coordinate pairs. Use cases include line charts and network visualizations.

  import { Graphic, Line, LineLayer, XAxis, YAxis } from '@snlab/florence'

<Graphic width={200} height={200} scaleX={[0, 10]} scaleY={[0, 10]} padding={20}>

    x={[0, 2.5, 2.5]}
    y={[0, 2.5, 0]}

    x={[[6, 4], [10, 7.5, 7.5]]} 
    y={[[4, 6], [10, 7.5, 10]]}
    stroke={['blue', 'green']}

  <XAxis />
  <YAxis />

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To render the Line mark, you will need to provide the x and y or the geometry props. The two uses are mutually exclusive.



Prop Required Type(s) Default Unit(s)(s)
x if (geometry === undefined) Number[], String[], Date[], Function undefined Local coordinate
y if (geometry === undefined) Number[], String[], Date[], Function undefined Local coordinate
geometry if (x === undefined && y === undefined) Array of GeoJSON LineString or MultiLineString features undefined Local coordinate
curve false Object undefined A d3-shape curve

x and y have to be arrays of Numbers, Strings or Dates, depending on the scale used in the parent Section. geometry accepts arrays of GeoJSON LineString and MultiLineString objects only. For all positioning props, a function can be supplied that bypasses the scaling step- see the local coordinates documentation. When using the LineLayer, all positioning props will be supplied as Arrays of Arrays of Numbers, Strings and Dates, or Functions that return scaled coordinates- see the marks versus layers documentation.


Prop Required Type(s) Default Unit(s)
stroke false String '#000000' Named, hex, rgb or hsl color
strokeWidth false Number 3 Pixel
opacity false Number 1 Number between 0 and 1
lineCap false String 'butt' 'butt', 'round' or 'square'
lineJoin false String 'bevel' 'bevel', 'round' or 'miter'
miterLimit false Number 10 Pixel
dashArray false String undefined A string of numbers seperated by spaces. See here
dashOffset false Number undefined Pixel

These aesthetic props are similar to attributes of the SVG line element. The analogous line attributes are shown below in brackets:

  • stroke refers to the color of the line
  • strokeWidth refers to the width of the line
  • strokeOpacity refers to the transparency of the line, 0 being fully transparent
  • lineCap controls the endings of the line (stroke-linecap)
  • lineJoin controls the shape to be used at the corners of the line (stroke-linejoin)
  • miterLimit, if lineJoin is 'miter', sets a limit on how long the miter can be (stroke-miterlimit)
  • dashArray can be used to make dashed lines (stroke-dasharray)
  • dashOffset shifts the pattern defined in dashArray by a number of pixels (stroke-dashoffset)


Mouse events

Prop Required Type(s) Default Unit(s)
onClick false Function undefined -
onMousedown false Function undefined -
onMouseup false Function undefined -
onMouseover false Function undefined -
onMouseout false Function undefined -
onMousedrag false Function undefined -

Touch events

Prop Required Type(s) Default Unit(s)
onTouchdown false Function undefined -
onTouchup false Function undefined -
onTouchover false Function undefined -
onTouchout false Function undefined -
onTouchdrag false Function undefined -

Select events

Prop Required Type(s) Default Unit(s)
onSelect false Function undefined -
onDeselect false Function undefined -

See the interactivity documentation for more information.


Prop Required Type(s) Default Unit(s)
outputSettings false Object undefined -
blockReindexing false Boolean false -
clip false String, undefined undefined Either 'padding', 'outer' or undefined
  • outputSettings: see the advanced rendering documentation for more information.
  • blockReindexing: see the interactivity documentation for more information.
  • clip: if defined, overrides the clip mode of the parent Graphic, Section or Glyph.

In addition, the LineLayer has the following props:

Prop Required Type(s) Default Unit(s)
keys false String[] undefined Array of unique keys
asOnePath false Boolean false -

See the marks versus layers documentation for more information on how keys and asOnePath work.


The Line and LineLayer can be seen in action in the following examples: