Chord diagram
Updated 5 years ago to v3.1.3 by Flourish team
How to use this template
This template is useful for showing relationships and the flow to and from values. It gives the option to color the chords as linear gradients or have the chords filled based on the source which is determined by the bigger flow.
Data requirements
There must be three columns. The first specifies the values from, the second specifies the values to, and the third is the count (a numerical number describing how many flows there were).
Tips
You can change the color based on your needs. By default it is a gradient but you can also use a fill colour. The fill colour is based on the biggest value.
If your text label is overlapping and your label alignment is "Along Arcs" your overlapping text label will not show up. This might be convenient for you, but you can also flip the label 90° that way your label won't overlap and will show up.
Chord diagrams can be difficult to understand so make sure to add an appropriate title. You can also add a popup to make it easier for the user to understand.
Flourish allows you to export an SVG. Do this if you want to add annotations in your favourite vector editing program.
Credits
Created by the Flourish team. Sample data from Crazy for Friends. Want to see additional features? Let us know at support@flourish.studio.
API information
This section documents API usage specific to this template, so for an introduction we suggest you refer to the generic API documentation instead.
template: @flourish/chord-diagram
version: 3
Template data
There are three different formats in which you can supply data to this template. The most convenient for you to use likely depends on the source of your data, as described below.
1. Array of arrays, and a bindings object
You can supply arrays of arrays to opts.data, which might look
like:
{
data: {
connections: [
[ "ConnectionsColumn1Value1", "ConnectionsColumn2Value1",
[ "ConnectionsColumn1Value2", "ConnectionsColumn2Value2",
[ "ConnectionsColumn1Value3", "ConnectionsColumn2Value3",
...
]
}
}
where each array of arrays represents the rows in a data sheet.
To tell the API how the values from each column should be
associated with the keys that the template is expecting, you must also supply
an object attached to opts.bindings. (The meanings of the
keys in the bindings object are documented
below.) The minimal bindings you can
supply for this template are as shown in this example:
{
template: "@flourish/chord-diagram",
version: "3",
bindings: {
connections: {
from: 0, // index of a column in your data
to: 1, // index of a column in your data
value: 2, // index of a column in your data
}
},
data: {
connections: [
[ "ConnectionsColumn1Value1", "ConnectionsColumn2Value1",
[ "ConnectionsColumn1Value2", "ConnectionsColumn2Value2",
[ "ConnectionsColumn1Value3", "ConnectionsColumn2Value3",
...
]
}
}
All possible bindings that you can supply are shown in this example:
{
template: "@flourish/chord-diagram",
version: "3",
bindings: {
connections: {
from: 0, // index of a column in your data
to: 1, // index of a column in your data
value: 2, // index of a column in your data
}
},
data: {
connections: [
[ "ConnectionsColumn1Value1", "ConnectionsColumn2Value1",
[ "ConnectionsColumn1Value2", "ConnectionsColumn2Value2",
[ "ConnectionsColumn1Value3", "ConnectionsColumn2Value3",
...
]
}
}
2. Array of objects with arbitrary keys, and a bindings object
This format is most likely useful when you have data from an external source,
such as CSV data loaded from d3-dsv.
You should supply this attached to the opts.data, which might look
like:
{
connections: [
{ "ConnectionsHeader1": ..., "ConnectionsHeader2": ..., ... },
{ "ConnectionsHeader1": ..., "ConnectionsHeader2": ..., ... },
{ "ConnectionsHeader1": ..., "ConnectionsHeader2": ..., ... },
...
]
}
... but with the keys being the column headers from your
source data instead. You must also supply an object attached to
opts.bindings. The minimal bindings you can
supply for this template are as shown in this example:
{
template: "@flourish/chord-diagram",
version: "3",
bindings: {
connections: {
from: "ConnectionsHeader1",
to: "ConnectionsHeader2",
value: "ConnectionsHeader3",
}
},
data: {
connections: [
{ "ConnectionsHeader1": ..., "ConnectionsHeader2": ..., ... },
{ "ConnectionsHeader1": ..., "ConnectionsHeader2": ..., ... },
{ "ConnectionsHeader1": ..., "ConnectionsHeader2": ..., ... },
...
]
}
}
All possible bindings that you can supply are shown in this example:
{
template: "@flourish/chord-diagram",
version: "3",
bindings: {
connections: {
from: "ConnectionsHeader1",
to: "ConnectionsHeader2",
value: "ConnectionsHeader3",
}
},
data: {
connections: [
{ "ConnectionsHeader1": ..., "ConnectionsHeader2": ..., ... },
{ "ConnectionsHeader1": ..., "ConnectionsHeader2": ..., ... },
{ "ConnectionsHeader1": ..., "ConnectionsHeader2": ..., ... },
...
]
}
}
(As before, the keys containing "Header" would be replaced by column names from your data source.)
3. Array of objects with template-defined keys
There is an alternative format you can use, which is likely to be easier to
use if your data is not from a spreadsheet source. With this alternative format
you supply your data to the template as
an array of objects, attached to opts.data, where the keys must
be those used by the template, as documented below. In this case
there is no need to supply a bindings object, since the key names are already
those expected by the template. The required properties in the data
object are as follows (scroll down for a
description of what each property is):
{
template: "@flourish/chord-diagram",
version: "3",
data: {
connections: [
{
from: ...,
to: ...,
value: ...
},
...
]
},
...
}
And the full list of all possible properties is as follows:
{
template: "@flourish/chord-diagram",
version: "3",
data: {
connections: [
{
from: ...,
to: ...,
value: ...
},
...
]
},
...
}
Meanings of the template data keys:
- connections.from: from
- connections.to: to
- connections.value: A number specifying the size of the flow
Template settings
Options for opts.state.
Colour
color.palette colors
Palette.
color.extend boolean
Auto-extend. Automatically generate additional colours when needed to avoid the palette colours being used more than once. Added colours are based on the average lightness and chroma values of the palette. This works best if the palette’s colours do not have very high or low saturation.
color.advanced boolean
Fine tune. Fine tune how additional colours are added to the palette.
color.hue_rotation_angle number
Hue rotation for added colours. Angle, in degrees in HCL colourspace, between one generated colour and the next. The default value, ~360/(Golden ratio), ensures adjacent hues are not too similar. Max: 360
color.custom_palette text
Custom overrides. Type the name of the entity whose colour you want to set, a colon and then a colour (using a name, hex-code or rgb declaration). Multiple colours can be set using multiple lines. For example:
Party 1: red
Party 2: #4455AA
Party 3: rgb(30,168,26)
gradient_type string
Chord colour mode. Allowed values:
Chords
opacity_chord number
Chord Opacity. Max: 1
selected_chords text
Highlight chords. To highlight an chords ribbons, write the name of each arc on a line. You can also create a story and highlight/unhighlight by clicking.
use_mouseover_label boolean
Show chord values on hover.
show_selected_label boolean
Keep chord values on click.
chord_labels_reponsive boolean
Label text size. Auto changed the label size based on the window size, subject to the specified min and max Allowed values:
chord_label_font_size number
Text size. Max: 40
chord_label_font_size_min number
Min size. Max: 40
chord_label_font_size_max number
Max size. Max: 40
show_chord_stroke boolean
Allowed values:
- true (Enabled)
- false (Disabled)
chord_stroke_color color
Stroke color.
chord_stroke_opacity number
Stroke opacity. Max: 1
Arcs
arc_spacing number
Space below arcs. in pixels
pad_angle number
Space between arcs. in radians Max: 1
label_alignment string
Alignment. Allowed values:
label_responsive boolean
Label text size. Auto changed the label size based on the window size, subject to the specified min and max Allowed values:
label_font_size number
Text size. Max: 40
label_font_size_min number
Min size. Max: 40
label_font_size_max number
Max size. Max: 40
label_color color
Arc label color.
use_label_color_arc boolean
Make the arc label color the same as the arc color.
Popup
popup.show_popups boolean
Popups. Allowed values:
popup.is_custom boolean
Popup contents. Allowed values:
popup.custom_template text
Popup content. The text to appear in the popup. You can use {{column_name}} to add a value from your data. It must be in a selected column, but you can add columns to “Metadata” if you just want to include them for use in the popup. Advanced users can include HTML to apply layouts, formatting, images, etc.
popup.show_pointer boolean
Pointer.
popup.show_shadow boolean
Shadow.
popup.style_popups boolean
Custom styling.
popup.text_color color
Text colour.
popup.align string
Alignment. Allowed values:
popup.font_size number
Font size. Min: 1
popup.fill_color color
Fill colour.
popup.opacity number
Fill opacity. Max: 1
popup.padding number
Padding.
popup.border_radius number
Radius. Corner radius of popup
popup_type string
Position. Allowed values:
popup_content text
Popup Description. Add a title or a discription to help explain your tooltip
Animation
animation_speed number
Animation Duration.
Number format
localization.input_decimal_separator string
Decimal separator in data sheet. Used for interpreting your data. Only change if data is not displaying on the chart as expected. Allowed values:
localization.output_separators string
Number format to display. How the numbers should appear on chart labels Allowed values:
label_format.prefix string
Prefix. Text to place in front of number
label_format.suffix string
Suffix. Text to place after number
label_format.n_dec number
Decimal places. Use negative integers to round to positive powers of ten (eg -2 rounds to the nearest 100) Min: -10 Max: 10
label_format.strip_zeros boolean
Remove trailing zeros.
label_format.strip_separator boolean
Hide thousands separator below 10,000. Turn off if you want four-digit numbers to include a separator, e.g. “1,234” rather than “1234”.
label_format.transform_labels boolean
Multiply/divide values.
label_format.transform string
Allowed values:
- multiply (Multiply by)
- divide (Divide by)
- exponentiate (×10 to the power of)
label_format.multiply_divide_constant number
label_format.exponentiate_constant number
Scaling and sizing
chart_scale number
Chart scale. Max: 1
allow_resize boolean
Allow embeds to resize. Checking this option allows the visualisation to resize so the chord diagram is always a square without white space to the sides or top/bottom.
Layout
layout.body_font font
Font.
layout.max_width number
Maximum width. Leave blank to stretch to container width Min: 50
layout.margin number
Margin.
layout.background_color_enabled boolean
Color. Allowed values:
layout.background_image_enabled boolean
Image. Allowed values:
layout.background_color color
Color.
layout.background_image_src url
Image URL.
layout.background_image_size string
Size. Allowed values:
layout.background_image_position string
Position. Allowed values:
layout.layout_order string
Layout order. Allowed values:
layout.space_between_sections string
Space between sections. Allowed values:
layout.space_between_sections_custom number
Custom. Max: 100
Header
layout.header_align string
Alignment. Allowed values:
layout.title string
layout.title_styling boolean
Change title styles.
layout.title_size string
Size. Allowed values:
layout.title_size_custom number
Custom. Specify a custom responsive font size. Best results will be with values between 1.2 and 3
layout.title_weight string
Weight. Allowed values:
layout.title_color color
Color.
layout.title_line_height number
Line height. Max: 3
layout.subtitle string
layout.subtitle_styling boolean
Change subtitle styles.
layout.subtitle_size string
Size. Allowed values:
layout.subtitle_size_custom number
Custom. Specify a custom responsive font size. Best results will be with values between 1.2 and 3
layout.subtitle_weight string
Weight. Allowed values:
layout.subtitle_color color
Color.
layout.subtitle_line_height number
Line height. Max: 3
layout.subtitle_space_above string
Space above. Allowed values:
layout.subtitle_space_above_custom number
Custom. Max: 100
layout.text string
layout.text_styling boolean
Change text styles.
layout.text_size string
Size. Allowed values:
layout.text_size_custom number
Custom. Specify a custom responsive font size. Best results will be with values between 1.2 and 3
layout.text_weight string
Weight. Allowed values:
layout.text_color color
Color.
layout.text_line_height number
Line height. Max: 3
layout.text_space_above string
Space above. Allowed values:
layout.text_space_above_custom number
Custom. Max: 100
Footer
layout.source_name string
Source name.
layout.source_url string
Source url.
layout.multiple_sources boolean
Multiple sources.
layout.source_name_2 string
Source name.
layout.source_url_2 string
Source url.
layout.source_name_3 string
Source name.
layout.source_url_3 string
Source url.
layout.source_label string
Source label.
layout.note string
Note.
layout.size number
Size.
layout.color color
Color.
layout.footer_align string
Alignment. Allowed values:
layout.logo_url url
Image.
layout.logo_link_url string
Link.
layout.logo_height number
Height.
layout.logo_margin number
Margin.
layout.logo_order string
Position. Allowed values:
layout.footer_align_vertical string
V. align. Allowed values:
