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 objectqrencode_svg: Return a QR encoded string as an svg string
Installation
devtools::install_github("hrbrmstr/qrencoder")
Usage
library(qrencoder) #> Loading required package: raster #> Loading required package: sp # current verison packageVersion("qrencoder") #> [1] '0.2.1' 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="")
SVG
cat(qrencode_svg(url)) #> <?xml version="1.0" encoding="UTF-8" standalone="yes"?> #> <!-- Created with qrencode 3.9.0 (http://fukuchi.org/works/qrencode/index.html.en) --> #> <svg width="2.01cm" height="2.01cm" viewBox="0 0 19 19" preserveAspectRatio="none" version="1.1" xmlns="http://www.w3.org/2000/svg"> #> <g id="QRcode"> #> <rect x="0" y="0" width="19" height="19" fill="#ffffff" /> #> <g id="Pattern"> #> <rect x="-1" y="-1" width="7" height="1" fill="#000000" /> #> <rect x="8" y="-1" width="1" height="1" fill="#000000" /> #> <rect x="11" y="-1" width="1" height="1" fill="#000000" /> #> <rect x="13" y="-1" width="7" height="1" fill="#000000" /> #> <rect x="-1" y="0" width="1" height="1" fill="#000000" /> #> <rect x="5" y="0" width="1" height="1" fill="#000000" /> #> <rect x="7" y="0" width="2" height="1" fill="#000000" /> #> <rect x="10" y="0" width="1" height="1" fill="#000000" /> #> <rect x="13" y="0" width="1" height="1" fill="#000000" /> #> <rect x="19" y="0" width="1" 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Test Results
library(qrencoder) library(testthat) date() #> [1] "Sun Nov 5 08:04:50 2017" 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.