Barcode

The barcode extension provides barcode rendering. Barcode macros can be specified using blocks, block macros, or inline macros using one of the following templates.

// Barcode block
[<type>, <attributes>] (1) (2)
----
<content> (3)
----

// Barcode block macro
<type>::<content>[<attributes>]

// Barcode inline macro
<type>:<content>[<attributes>]

1	Type barcode type. One of `bookland`, `codabar`, `code25`, `code25iata`, `code25interleaved`, `code39`, `code93`, `code128`, `code128a`, `code128b`, `code128c`, `ean8`, `ean13`, `gs1_128`, `qrcode`, or `upca`.
2	Attributes
3	The content to encode in the barcode

By default, the content field of the barcode macros will be interpreted as the barcode content. This works fine for simple barcodes, but for complex data (e.g., a vCard encoded as a QR code) this is not practical. If the external attribute is set on a barcode macro, the target is interpreted as a file path. The barcode content will then be obtained by reading the contents of the referenced file.

Installation

All barcodes types except QR codes require the barby Ruby gem
QR codes requires the rqrcode Ruby gem
PNG image output requires the chunky_png gem

Each of these dependencies will automatically get loaded as needed. It is not necessary to require these manually using the -r Asciidoctor CLI option.

Example

Barcdodes can be written codabar:A31117013206375A[png, height=10] inline or as blocks.

[qrcode, format="png", xdim=4]
....
Hello World!
....

Barcode can be written barcode inline or as blocks.

Supported Image Formats

Attributes

Name	Default value	Description
external	false	When set to true the target of a barcode macro is interpreted as an external source file instead of as the contents of the barcode
height	100	The height of the bars. (1D only, 2D uses ydim)
xdim	1	The width of the narrowest bar in a barcode. Thicker bars are multiples of the xdim.
ydim	Same as xdim	This is the same as xdim, but for the height of the blocks in a 2D barcode.
margin	10	The width of the quiet zone around the barcode.
foreground	black	The color of the bars specified as a 3 or 6 digit hex RGB value or HTML color name.
background	white	The color of the background specified as a 3 or 6 digit hex RGB value or HTML color name.

Name

Default value

Description

external

false

When set to true the target of a barcode macro is interpreted as an external source file instead of as the contents of the barcode

height

100

The height of the bars. (1D only, 2D uses ydim)

xdim

The width of the narrowest bar in a barcode. Thicker bars are multiples of the xdim.

ydim

Same as xdim

This is the same as xdim, but for the height of the blocks in a 2D barcode.

margin

The width of the quiet zone around the barcode.

foreground

black

The color of the bars specified as a 3 or 6 digit hex RGB value or HTML color name.

background

white

The color of the background specified as a 3 or 6 digit hex RGB value or HTML color name.