Title: Quick Response Code (QR Code) / Matrix Barcode Creator
Version: 0.1.0
Maintainer: Bob Rudis <bob@rud.is>
Description: Quick Response codes (QR codes) are a type of matrix bar code and can be used to authenticate transactions, provide access to multi-factor authentication services and enable general data transfer in an image. QR codes use four standardized encoding modes (numeric, alphanumeric, byte/binary, and kanji) to efficiently store data. Matrix barcode generation is performed efficiently in C via the included 'libqrencoder' library created by Kentaro Fukuchi.
Depends: R (≥ 3.1.0), raster
License: GPL-2
LazyData: true
Suggests: testthat
LinkingTo: Rcpp
Imports: Rcpp, base64enc, png
URL: http://github.com/hrbrmstr/qrencoder
BugReports: https://github.com/hrbrmstr/qrencoder/issues
RoxygenNote: 5.0.1
NeedsCompilation: yes
Packaged: 2016-09-15 22:05:22 UTC; bob
Author: Bob Rudis [aut, cre], Kentaro Fukuchi [ctb] (libqrencoder)
Repository: CRAN
Date/Publication: 2016-09-16 01:50:10

Quick Response Code (QR Code) / Matrix Barcode Creator

Description

Quick Response codes (QR codes) are a type of matrix bar code and can be used to authenticate transactions, provide access to multi-factor authentication services and enable general data transfer in an image. QR codes use four standardized encoding modes (numeric, alphanumeric, byte/binary, and kanji) to efficiently store data. Matrix barcode generation is performed efficiently in C via the included 'libqrencoder' library created by Kentaro Fukuchi.

Author(s)

Bob Rudis (bob@rud.is)

Return a QR encoded string as a matrix

Description

Useful if you want to do your own post-processing

Usage

qrencode(to_encode)

Arguments

to_encode

the data to encode

Examples

qrencode("http://rud.is/b")

Return a QR encoded string as an x, y, z data.frame

Description

Useful for ggplot::geom_raster

Usage

qrencode_df(to_encode)

Arguments

to_encode

the data to encode

Examples

head(qrencode_df("http://rud.is/b"))

Return a QR encoded string as a base 64 encoded inline png

Description

Return a QR encoded string as a base 64 encoded inline png

Usage

qrencode_png(to_encode)

Arguments

to_encode

the data to encode

Note

data:image/png;base64, is prepended to the encoded png

Examples

cat(qrencode_png("http://rud.is/b"))

Return a QR encoded string as a raster object

Description

Return a QR encoded string as a raster object

Usage

qrencode_raster(to_encode)

Arguments

to_encode

the data to encode

Examples

library(raster)
old_mar <- par()$mar
par(mar=c(0,0,0,0))
image(qrencode_raster("http://rud.is/b"), asp=1, col=c("white", "black"),
                                          axes=FALSE, xlab="", ylab="")
par(mar=old_mar)

Encodes a string as a QR code

Description

Encodes a string as a QR coder

Usage

qrencode_raw(to_encode, version = 0L, level = 0L, hint = 2L,
  caseinsensitive = 1L)

Arguments

to_encode

character string to encode

version

version of the symbol. If 0, the library chooses the minimum version for the given input data.

level

error correction level (0 - 3, lowest to highest)

hint

tell the library how Japanese Kanji characters should be encoded. If "3", the library assumes that the given string contains Shift-JIS characters and encodes them in Kanji-mode. If "2" is given, all of non-alphanumerical characters will be encoded as is. If you want to embed UTF-8 string, choose this. Other mode will cause EINVAL error.

"0" is "numeric mode", "1" is "alphanumeric mode", "5" is "ECI mode".

caseinsensitive

case-sensitive(1) or not(0).

See Also

http://www.qrcode.com/en/about/version.html