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45 lines
1.5 KiB
Plaintext
45 lines
1.5 KiB
Plaintext
title: $:/plugins/tiddlywiki/qrcode/usage
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! `makeqr` Macro
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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]].
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!! Parameters
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;text
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: The text to encode
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;size
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: The size of the image in pixels (defaults to 500)
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;errorCorrectLevel
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: Determines the amount of error correction applied to the image; see below (defaults to "M").
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;fallback
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: The fallback image to be returned in case of an error (see below)
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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.
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The error correction level is a [[QR code feature|http://www.qrcode.com/en/about/error_correction.html]]:
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<<<
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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.
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<<<
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!! Examples
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Making a QR code for a simple string of text:
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```
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<<makeqr "Hello there!">>
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```
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Making a QR code for the URL field of the current tiddler:
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```
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<$macrocall $name="makeqr" text={{!!url}}/>
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```
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Making a QR code for the URL of the current wiki:
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```
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<$macrocall $name="makeqr" text={{$:/info/url/full}}/>
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```
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