This section documents API usage specific to this template, so for an introduction we suggest you refer to the generic API documentation instead.

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: {
        data: [
            [ "DataColumn1Value1", "DataColumn2Value1",
            [ "DataColumn1Value2", "DataColumn2Value2",
            [ "DataColumn1Value3", "DataColumn2Value3",
            ...
        ]
    }
}

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/draw-the-line",
    version: "4",
    bindings: {
        data: {
            x: 0, // index of a column in your data
        }
    },
    data: {
        data: [
            [ "DataColumn1Value1", "DataColumn2Value1",
            [ "DataColumn1Value2", "DataColumn2Value2",
            [ "DataColumn1Value3", "DataColumn2Value3",
            ...
        ]
    }
}

All possible bindings that you can supply are shown in this example:

{
    template: "@flourish/draw-the-line",
    version: "4",
    bindings: {
        data: {
            x: 0, // index of a column in your data
            lines_reveal: [1, 2, ...], // index(es) of column(s) in your data
            lines_fixed: [3, 4, ...], // index(es) of column(s) in your data
        }
    },
    data: {
        data: [
            [ "DataColumn1Value1", "DataColumn2Value1",
            [ "DataColumn1Value2", "DataColumn2Value2",
            [ "DataColumn1Value3", "DataColumn2Value3",
            ...
        ]
    }
}

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:

{
        data: [
            { "DataHeader1": ..., "DataHeader2": ..., ... },
            { "DataHeader1": ..., "DataHeader2": ..., ... },
            { "DataHeader1": ..., "DataHeader2": ..., ... },
            ...
        ]
    }

... 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/draw-the-line",
    version: "4",
    bindings: {
        data: {
            x: "DataHeader1",
        }
    },
    data: {
        data: [
            { "DataHeader1": ..., "DataHeader2": ..., ... },
            { "DataHeader1": ..., "DataHeader2": ..., ... },
            { "DataHeader1": ..., "DataHeader2": ..., ... },
            ...
        ]
    }
}

All possible bindings that you can supply are shown in this example:

{
    template: "@flourish/draw-the-line",
    version: "4",
    bindings: {
        data: {
            x: "DataHeader1",
            lines_reveal: ["DataHeader2", "DataHeader3", ...],
            lines_fixed: ["DataHeader4", "DataHeader5", ...],
        }
    },
    data: {
        data: [
            { "DataHeader1": ..., "DataHeader2": ..., ... },
            { "DataHeader1": ..., "DataHeader2": ..., ... },
            { "DataHeader1": ..., "DataHeader2": ..., ... },
            ...
        ]
    }
}

(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/draw-the-line",
    version: "4",
    data: {
    data: [
        {
            x: ...,
            lines_reveal: [...],
            lines_fixed: [...]
        },
        ...
    ]
},
    ...
}

And the full list of all possible properties is as follows:

{
    template: "@flourish/draw-the-line",
    version: "4",
    data: {
    data: [
        {
            x: ...,
            lines_reveal: [...],
            lines_fixed: [...]
        },
        ...
    ]
},
    ...
}

Meanings of the template data keys:

• data.x: Labels for the x axis
• data.lines_reveal: lines_reveal
• data.lines_fixed: lines_fixed

Template settings

Options for opts.state.

Lines

guess_lines_start number

% to reveal.

guess_lines_width number

Width. In rems – multiples of the base font size

guess_lines_dot_radius number

Dot radius.

guess_lines_dash number

Drawing dash size. Only applies to the drawn section of the line. Set to zero for a solid line

fixed_lines_width number

Width. In rems – multiples of the base font size

fixed_lines_dot_radius number

Dot radius.

line_curve string

Live curve.

Messages

guess_lines_panel_position string

Position.

message_styling boolean

Styling.

message_background color

Background.

message_opacity number

Opacity.

message_color color

Font colour.

message_font_size number

Font size. In rems: multiples of the project's base font size

message_border color

Border colour.

message_border_width number

Border width. In pixels

message_border_radius number

Border radius. In ems: multiples of the panel's font size

message_shadow boolean

Drop shadow.

guess_lines_message_text string

Text. Include {{LINE}} to show the line's name, in color

scores_3_min number

% error. Specified as the maximum % error allowed, relative to the total y axis

scores_3_text string

Text. Use {{DIFF}} to show the average gap from the user's guess to the real data point

scores_2_min number

% error. Specified as the maximum % error allowed, relative to the total y axis

scores_2_text string

Text.

scores_1_min number

% error. Specified as the maximum % error allowed, relative to the total y axis

scores_1_text string

Text.

scores_0_text string

Text.

Submit button

guess_lines_submit_text string

Text. In rems: multiples of the project's base font size

submit_styling boolean

Styling.

submit_background color

Background.

submit_opacity number

Opacity.

submit_color color

Font colour.

submit_font_size number

Font size. In rems: multiples of the project's base font size

submit_border color

Border colour.

submit_border_width number

Border width. In pixels

submit_border_radius number

Border radius. In ems: multiples of the panel's font size

submit_shadow boolean

Drop shadow.

Colors

color.scale_type string

Scale type.

color.categorical_palette colors

Palette.

color.categorical_extend boolean

Extend. Automatically generate additional colours when needed to avoid the palette colours being used more than once.

color.categorical_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)

color.numeric_type string

Scale type.

color.binning boolean

In linear mode, the color scale will run as a smooth gradient between 2 colors. In binned mode, the gradient will be divided in smaller blocks.

color.bin_mode string

Binning mode.

color.bin_count number

Number of bins.

color.bin_thresholds string

Custom thresholds. Write your custom thresholds, separated by a ";" For example 5;10;15

color.sequential_palette string

Palette.

color.sequential_reverse boolean

Reverse.

color.sequential_custom_min color

Minimum color.

color.sequential_custom_max color

Maximum color.

color.sequential_color_space string

Color space.

color.sequential_custom_domain boolean

Domain.

color.sequential_domain_min number

Min.

color.sequential_domain_max number

Max.

color.diverging_palette string

Palette.

color.diverging_reverse boolean

Reverse.

color.diverging_custom_min color

Minimum color.

color.diverging_custom_mid color

Midpoint color.

color.diverging_custom_max color

Maximum color.

color.diverging_color_space string

Color space.

color.diverging_custom_domain boolean

Domain.

color.diverging_domain_min number

Min.

color.diverging_domain_mid number

Mid.

color.diverging_domain_max number

Max.

Legend

legend.show_legend boolean

legend.text_color color

Color.

legend.text_size number

Size.

legend.text_weight string

Weight.

legend.title_mode string

Title mode.

legend.title string

Title.

legend.title_weight string

Weight.

legend.swatch_width number

Width.

legend.swatch_height number

Height.

legend.swatch_radius number

Roundness. The radius of the corners of the swatch (in pixels)

legend.order_override text

Custom order override. Manually specify the order of legend entries (one entry per line)

legend.orientation string

Orientation.

X axis

x.axis_position string

Position.

x.y_axis_position string

Y value. Vertical position of the x axis on the y scale

x.numeric_scale_type string

Type.

x.linear_min number

Min.

x.linear_max number

Max.

x.log_min number

Min.

x.log_max number

Max.

x.datetime_min string

Min (date).

x.datetime_max string

Max (date).

x.show_scale_settings boolean

Configure default min/max.

x.nice boolean

Round min/max. When enabled, scales automatically extend to "nice" rounded start/end values, such as hundreds or whole years. Overridden by any explicitly specified scale min and max.

x.zero_axis string

Include zero. Whether to extend the axis to include zero if the data values are all positive or all negative. Overridden by any explicitly specified scale min and max.

x.title_mode string

Type.

x.title string

Text.

x.title_styling boolean

Styling.

x.title_weight string

Weight.

x.title_color color

Color.

x.title_size number

Size.

x.title_padding number

Padding.

x.tick_label_position string

Position.

x.tick_label_styling boolean

Styling.

x.tick_label_size number

Size.

x.tick_label_color color

Color.

x.tick_padding number

Padding.

x.tick_label_angle string

Angle.

x.tick_label_weight string

Weight.

x.tick_label_max_lines number

Max lines.

x.tick_label_line_height number

Line height.

x.tick_label_space_mode string

Space mode.

x.tick_label_space number

Space.

x.tick_mode string

Mode.

x.tick_number number

Number. Approximate number of ticks or gridlines. The actual number will depend on the range of values, chart size, etc.

x.tick_custom text

One tick label per line. Specify the ticks to show, one per line

x.line_and_tick_color color

Line color.

x.line_and_tick_width number

Line width.

x.tick_length number

Tick length.

x.tick_side string

Tick side.

x.line_visible boolean

Axis line.

x.edge_padding number

Edge padding (%). Space between start/end of axis line and first/last category tick as a percentage of the spacing between ticks

x.gridlines_visible boolean

x.gridlines_styling boolean

Styling.

x.gridline_color color

Color.

x.gridline_style string

Style.

x.gridline_width number

Width.

x.gridline_category_dividers boolean

Put lines between categories. On a categorical axis this option disables the gridline on each tick and instead adds rules between each category to give a table-like design. Ignored for date and numeric axes.

x.gridline_category_dividers_extend boolean

Extend. Extends the dividers into the axis margins.

Y axis

y.axis_visible boolean

y.numeric_scale_type string

Type.

y.linear_min number

Min.

y.linear_max number

Max.

y.log_min number

Min.

y.log_max number

Max.

y.datetime_min string

Min (date).

y.datetime_max string

Max (date).

y.show_scale_settings boolean

Configure default min/max.

y.nice boolean

Round min/max. When enabled, scales automatically extend to "nice" rounded start/end values, such as hundreds or whole years. Ignored for cagorical scales, and overridden by any specified min/max.

y.zero_axis string

Include zero. Whether to extend the axis to include zero if the data values are all positive or all negative. Ignored for date and categorical scales, and overridden by any specified min/max.

y.title_mode string

Type.

y.title string

Text.

y.title_styling boolean

Styling.

y.title_weight string

Weight.

y.title_color color

Color.

y.title_size number

Size.

y.title_padding number

Padding.

y.tick_label_position string

Position.

y.tick_label_styling boolean

Styling.

y.tick_label_size number

Size.

y.tick_label_color color

Color.

y.tick_padding number

Padding.

y.tick_label_angle string

Angle.

y.tick_label_weight string

Weight.

y.tick_label_max_lines number

Max lines.

y.tick_label_line_height number

Line height.

y.tick_label_space_mode string

Space mode.

y.tick_label_space number

Space.

y.tick_mode string

Mode.

y.tick_number number

Number. Approximate number of ticks or gridlines. The actual number will depend on the range of values, chart size, etc.

y.tick_custom text

One tick label per line. Specify the ticks to show, one per line

y.line_and_tick_color color

Line color.

y.line_and_tick_width number

Line width.

y.tick_length number

Tick length.

y.tick_side string

Side.

y.line_visible boolean

Axis line.

y.edge_padding number

Edge padding (%). Space between start/end of axis line and first/last category tick as a percentage of the spacing between ticks

y.gridlines_visible boolean

y.gridlines_styling boolean

Styling.

y.gridline_color color

Color.

y.gridline_style string

Style.

y.gridline_width number

Width.

y.gridline_category_dividers boolean

Put lines between categories. On a categorical axis this option disables the gridline on each tick and instead adds rules between each category to give a table-like design. Ignored for date and numeric axes.

y.gridline_category_dividers_extend boolean

Extend. Extends the dividers into the axis margins

Chart background

background.background_color_enabled boolean

Color.

background.background_image_enabled boolean

Image.

background.background_color color

Color.

background.background_image_src url

Image URL.

background.background_image_size string

Size.

background.background_image_position string

Position.

Number and date formatting

datetime_input_format string

Format in data sheet. The date/time format in the data sheet. Leave as “Auto” for Flourish to make a best guess. If it isn’t in the list, you can enter a custom format using d3-time-format syntax. See npmjs.com/package/d3-time-format for details.

date_format string

Display format. The date/time format to show in the graphic. If it isn’t in the list, you can enter a custom format using d3-time-format syntax. See npmjs.com/package/d3-time-format for details.

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.

localization.output_separators string

Number format to display. How the numbers should appear on chart labels

formatter.prefix string

Prefix. Text to place in front of number

formatter.suffix string

Suffix. Text to place after number

formatter.n_dec number

Decimal places. Use negative integers to round to positive powers of ten (eg -2 rounds to the nearest 100)

formatter.advanced boolean

Advanced.

formatter.negative_sign string

Styling of negative numbers.

formatter.strip_zeros boolean

Remove trailing zeros.

formatter.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”.

formatter.transform_labels boolean

Multiply/divide values.

formatter.transform string

formatter.multiply_divide_constant number

formatter.exponentiate_constant number

Layout

Layout

layout.body_font font

Main font. This font will apply to the whole graphic by default, but you can optionally change the font for the title, subtitle, footer, etc in the Header and Footer settings panels.

layout.font_color color

Text color. This color will apply to the whole graphic by default, but you can optionally change the color for individual text elements, in other settings panels.

layout.background_color_enabled boolean

Color.

layout.background_image_enabled boolean

Image.

layout.background_color color

Background color.

layout.background_image_src url

Image URL.

layout.background_image_size string

Size.

layout.background_image_position string

Position.

layout.max_width_target string

Maximum width. Apply a maximum width to just the main graphic or everything (main graphic plus header, footer, etc)

layout.max_width number

Maximum width. Leave blank to stretch to container width

layout.max_width_align string

Align.

layout.layout_order string

Layout order.

layout.space_between_sections string

Space between sections.

layout.space_between_sections_custom number

Custom.

layout.margin_top number

Top.

layout.margin_right number

Right.

layout.margin_bottom number

Bottom.

layout.margin_left number

Left.

layout.border.enabled boolean

Show borders around visualisation.

layout.border.top.width number

Top.

layout.border.top.style string

Style.

layout.border.top.color color

Color.

layout.border.right.width number

Right.

layout.border.right.style string

Style.

layout.border.right.color color

Color.

layout.border.bottom.width number

Bottom.

layout.border.bottom.style string

Style.

layout.border.bottom.color color

Color.

layout.border.left.width number

Left.

layout.border.left.style string

Style.

layout.border.left.color color

Color.

Header

layout.header_align string

Alignment.

layout.title string

layout.title_styling boolean

Change title styles.

layout.title_font font

Title Font.

layout.title_size string

Size.

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.

layout.title_color color

Color.

layout.title_line_height number

Line height.

layout.title_space_above string

Space above.

layout.title_space_above_custom number

Custom.

layout.subtitle string

layout.subtitle_styling boolean

Change subtitle styles.

layout.subtitle_font font

Subtitle Font.

layout.subtitle_size string

Size.

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.

layout.subtitle_color color

Color.

layout.subtitle_line_height number

Line height.

layout.subtitle_space_above string

Space above.

layout.subtitle_space_above_custom number

Custom.

layout.header_text string

layout.header_text_styling boolean

Styling.

layout.header_text_size string

Size.

layout.header_text_size_custom number

Custom. Specify a custom responsive font size. Best results will be with values between 1.2 and 3

layout.header_text_weight string

Weight.

layout.header_text_color color

Color.

layout.header_text_line_height number

Line height.

layout.header_text_space_above string

Space above.

layout.header_text_space_above_custom number

Custom.

layout.header_border string

layout.header_border_width number

Width.

layout.header_border_color color

Color.

layout.header_border_style string

Style.

layout.header_border_space number

Space. Space between border and header text

layout.header_logo_enabled boolean

layout.header_logo_src url

URL.

layout.header_logo_height number

Height.

layout.header_logo_align string

Align. Align logo inside header or outer visualisation container

layout.header_logo_position_inside string

Position.

layout.header_logo_position_outside string

Position.

layout.header_logo_margin_top number

Top.

layout.header_logo_margin_right number

Right.

layout.header_logo_margin_bottom number

Bottom.

layout.header_logo_margin_left number

Left.

Footer

layout.footer_align string

Alignment.

layout.footer_text_size number

Size.

layout.footer_text_color color

Color.

layout.footer_styling boolean

Advanced footer styles.

layout.footer_font font

Font.

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.footer_note string

Note.

layout.footer_note_secondary string

Note (secondary). The secondary note is placed below the source and primary note

layout.footer_logo_enabled boolean

Image.

layout.footer_logo_src url

Image.

layout.footer_logo_src_light hidden

Image (light version). If provided this version will be used whenever the background colour is dark

layout.footer_logo_link_url string

Link.

layout.footer_logo_height number

Height.

layout.footer_logo_margin number

Margin.

layout.footer_logo_order string

Position.

layout.footer_align_vertical string

V. align.

layout.footer_border string

layout.footer_border_width number

Width.

layout.footer_border_color color

Color.

layout.footer_border_style string

Style.

layout.footer_border_space number

Space. Space between border and footer text

Accessibility

layout.screenreader_hide_primary boolean

Screenreader mode for main visual container. Whether the main visual container is visible to screenreaders. (Text in the header and footer are always available to screenreaders.)

layout.screenreader_text_primary text

Screenreader description. A text alternative to the visual content that will only be visible to screenreaders, e.g. “The line chart shows China consistently higher than the other countries since 1990”. Do no replicate your title, since that will also be read by screenreaders.