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Added first version of QR code generator plugin

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Jermolene
2016-10-18 09:23:47 +01:00
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plugins/tiddlywiki/qrcode/doc/usage.tid Normal file
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title: $:/plugins/tiddlywiki/qrcode/usage
! `makeqr` Macro
The <<.def makeqr>> [[macro|Macros]] converts text data into an image of the corresponding QR code. The image is returned as [[base64-encoded data URI|https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs]].
!! Parameters
;text
: The text to encode
;size
: The size of the image in pixels (defaults to 500)
;errorCorrectLevel
: Determines the amount of error correction applied to the image; see below (defaults to "M").
;fallback
: The fallback image to be returned in case of an error (see below)
The conversion will fail if the text is too long and/or complex and the macro will return the provided fallback image. If no fallback image is provided then an error image is generated.
The error correction level is a [[QR code feature|http://www.qrcode.com/en/about/error_correction.html]]:
<<<
QR Code has error correction capability to restore data if the code is dirty or damaged. ... Level Q or H may be selected for factory environment where QR Code get dirty, whereas Level L may be selected for clean environment with the large amount of data. Typically, Level M (15%) is most frequently selected.
<<<