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:
qrencode: Return a QR encoded string as a matrixqrencode_df: Return a QR encoded string as an x, y, z
data.frameqrencode_png: Return a QR encoded string as a base 64
encoded inline pngqrencode_raster: Return a QR encoded string as a raster
objectdevtools::install_github("hrbrmstr/qrencoder")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="")
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 ===================================================================================================================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.