Radar Diagram (v11.6.0+) ​

Introduction ​

A radar diagram is a simple way to plot low-dimensional data in a circular format.

It is also known as a radar chart, spider chart, star chart, cobweb chart, polar chart, or Kiviat diagram.

Usage ​

This diagram type is particularly useful for developers, data scientists, and engineers who require a clear and concise way to represent data in a circular format.

It is commonly used to graphically summarize and compare the performance of multiple entities across multiple dimensions.

Syntax ​

radar-beta
axis A, B, C, D, E
curve c1{1,2,3,4,5}
curve c2{5,4,3,2,1}
... More Fields ...

Examples ​

---
title: "Grades"
---
radar-beta
  axis m["Math"], s["Science"], e["English"]
  axis h["History"], g["Geography"], a["Art"]
  curve a["Alice"]{85, 90, 80, 70, 75, 90}
  curve b["Bob"]{70, 75, 85, 80, 90, 85}

  max 100
  min 0

---
title: "Grades"
---
radar-beta
  axis m["Math"], s["Science"], e["English"]
  axis h["History"], g["Geography"], a["Art"]
  curve a["Alice"]{85, 90, 80, 70, 75, 90}
  curve b["Bob"]{70, 75, 85, 80, 90, 85}

  max 100
  min 0

radar-beta
  title Restaurant Comparison
  axis food["Food Quality"], service["Service"], price["Price"]
  axis ambiance["Ambiance"],

  curve a["Restaurant A"]{4, 3, 2, 4}
  curve b["Restaurant B"]{3, 4, 3, 3}
  curve c["Restaurant C"]{2, 3, 4, 2}
  curve d["Restaurant D"]{2, 2, 4, 3}

  graticule polygon
  max 5

radar-beta
  title Restaurant Comparison
  axis food["Food Quality"], service["Service"], price["Price"]
  axis ambiance["Ambiance"],

  curve a["Restaurant A"]{4, 3, 2, 4}
  curve b["Restaurant B"]{3, 4, 3, 3}
  curve c["Restaurant C"]{2, 3, 4, 2}
  curve d["Restaurant D"]{2, 2, 4, 3}

  graticule polygon
  max 5

Details of Syntax ​

Title ​

title: The title is an optional field that allows to render a title at the top of the radar diagram.

radar-beta
  title Title of the Radar Diagram
  ...

Axis ​

axis: The axis keyword is used to define the axes of the radar diagram.

Each axis is represented by an ID and an optional label.

Multiple axes can be defined in a single line.

radar-beta
  axis id1["Label1"]
  axis id2["Label2"], id3["Label3"]
  ...

Curve ​

curve: The curve keyword is used to define the data points for a curve in the radar diagram.

Each curve is represented by an ID, an optional label, and a list of values.

Values can be defined by a list of numbers or a list of key-value pairs. If key-value pairs are used, the key represents the axis ID and the value represents the data point. Else, the data points are assumed to be in the order of the axes defined.

Multiple curves can be defined in a single line.

radar-beta
  axis axis1, axis2, axis3
  curve id1["Label1"]{1, 2, 3}
  curve id2["Label2"]{4, 5, 6}, id3{7, 8, 9}
  curve id4{ axis3: 30, axis1: 20, axis2: 10 }
  ...

Options ​

• showLegend: The showLegend keyword is used to show or hide the legend in the radar diagram. The legend is shown by default.
• max: The maximum value for the radar diagram. This is used to scale the radar diagram. If not provided, the maximum value is calculated from the data points.
• min: The minimum value for the radar diagram. This is used to scale the radar diagram. If not provided, the minimum value is 0.
• graticule: The graticule keyword is used to define the type of graticule to be rendered in the radar diagram. The graticule can be circle or polygon. If not provided, the default graticule is circle.
• ticks: The ticks keyword is used to define the number of ticks on the graticule. It is the number of concentric circles or polygons drawn to indicate the scale of the radar diagram. If not provided, the default number of ticks is 5.

radar-beta
  ...
  showLegend true
  max 100
  min 0
  graticule circle
  ticks 5
  ...

Configuration ​

Please refer to the configuration guide for details.

Theme Variables ​

Global Theme Variables ​

Radar charts support the color scales cScale${i} where i is a number from 0 to the theme’s maximum number of colors in its color scale. Usually, the maximum number of colors is 12.

Radar Style Options ​

Example on config and theme ​

---
config:
  radar:
    axisScaleFactor: 0.25
    curveTension: 0.1
  theme: base
  themeVariables:
    cScale0: "#FF0000"
    cScale1: "#00FF00"
    cScale2: "#0000FF"
    radar:
      curveOpacity: 0
---
radar-beta
  axis A, B, C, D, E
  curve c1{1,2,3,4,5}
  curve c2{5,4,3,2,1}
  curve c3{3,3,3,3,3}

---
config:
  radar:
    axisScaleFactor: 0.25
    curveTension: 0.1
  theme: base
  themeVariables:
    cScale0: "#FF0000"
    cScale1: "#00FF00"
    cScale2: "#0000FF"
    radar:
      curveOpacity: 0
---
radar-beta
  axis A, B, C, D, E
  curve c1{1,2,3,4,5}
  curve c2{5,4,3,2,1}
  curve c3{3,3,3,3,3}