The hardware and bandwidth for this mirror is donated by dogado GmbH, the Webhosting and Full Service-Cloud Provider. Check out our Wordpress Tutorial.
If you wish to report a bug, or if you are interested in having us mirror your free-software or open-source project, please feel free to contact us at mirror[@]dogado.de.

qrencoder : Make QR codes in R

There is another package on CRAN – qrcode – that is not C-backed.

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.

The following functions are implemented:

Installation

devtools::install_github("hrbrmstr/qrencoder")

Usage

library(qrencoder)
#> Loading required package: raster
#> Loading required package: sp

# current verison
packageVersion("qrencoder")
#> [1] '0.1.0'

url <- "http://rud.is/b"
head(qrencode(url))
#>      [,1] [,2] [,3] [,4] [,5] [,6] [,7] [,8] [,9] [,10] [,11] [,12] [,13] [,14] [,15] [,16] [,17] [,18] [,19] [,20]
#> [1,]    1    1    1    1    1    1    1    0    1     0     0     0     0     0     1     1     1     1     1     1
#> [2,]    1    0    0    0    0    0    1    0    1     1     1     1     0     0     1     0     0     0     0     0
#> [3,]    1    0    1    1    1    0    1    0    0     0     1     1     1     0     1     0     1     1     1     0
#> [4,]    1    0    1    1    1    0    1    0    1     0     1     1     0     0     1     0     1     1     1     0
#> [5,]    1    0    1    1    1    0    1    0    0     1     1     0     1     0     1     0     1     1     1     0
#> [6,]    1    0    0    0    0    0    1    0    0     0     1     0     0     0     1     0     0     0     0     0
#>      [,21]
#> [1,]     1
#> [2,]     1
#> [3,]     1
#> [4,]     1
#> [5,]     1
#> [6,]     1

head(qrencode_df(url))
#>   x  y z
#> 1 0 20 1
#> 2 1 20 1
#> 3 2 20 1
#> 4 3 20 1
#> 5 4 20 1
#> 6 5 20 1

qrencode_png(url)
#> [1] "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABUAAAAVCAAAAACMfPpKAAAACXBIWXMAAC4jAAAuIwF4pT92AAAAfElEQVQYlU2QWwrEMAwDR0vuf+XZj8qJSyjIyNYjAkAMQNFhkBCKzoNiin70kxKBN41ENuf7+9AZWQOGRx/2m4TeKy2YO0GyDpwszW5EUCs/ur78NZtGvSa8azdPDGttsonot8LtDFNnrs4yLSbuJk0ajnV3vevhCxUj4Q+R11n764g4WgAAAABJRU5ErkJggg=="

qrencode_raster(url)
#> class       : RasterLayer 
#> dimensions  : 21, 21, 441  (nrow, ncol, ncell)
#> resolution  : 0.04761905, 0.04761905  (x, y)
#> extent      : 0, 1, 0, 1  (xmin, xmax, ymin, ymax)
#> coord. ref. : NA 
#> data source : in memory
#> names       : layer 
#> values      : 0, 1  (min, max)

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

Test Results

library(qrencoder)
library(testthat)

date()
#> [1] "Thu Sep 15 18:01:43 2016"

test_dir("tests/")
#> testthat results ========================================================================================================
#> OK: 0 SKIPPED: 0 FAILED: 0
#> 
#> DONE ===================================================================================================================

Code of Conduct

Please note that this project is released with a Contributor Code of Conduct. By participating in this project you agree to abide by its terms.

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.
Health stats visible at Monitor.