Qrencoder
:white_square_button: Make QR codes in R via libqrencode
Install / Use
/learn @hrbrmstr/QrencoderREADME
<!-- README.md is generated from README.Rmd. Please edit that file -->
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" height="1" fill="#000000" />
#> <rect x="-1" y="1" width="1" height="1" fill="#000000" />
#> <rect x="1" y="1" width="3" height="1" fill="#000000" />
#> <rect x="5" y="1" width="1" height="1" fill="#000000" />
#> <rect x="7" y="1" width="2" height="1" fill="#000000" />
#> <rect x="10" y="1" width="1" height="1" fill="#000000" />
#> <rect x="13" y="1" width="1" height="1" fill="#000000" />
#> <rect x="15" y="1" width="3" height="1" fill="#000000" />
#> <rect x="19" y="1" width="1" height="1" fill="#000000" />
#> <rect x="-1" y="2" width="1" height="1" fill="#000000" />
#> <rect x="1" y="2" width="3" height="1" fill="#000000" />
#> <rect x="5" y="2" width="1" height="1" fill="#000000" />
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#> <rect x="19" y="2" width="1" height="1" fill="#000000" />
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