QRCode type.

Error correction level. Provides the following error correction capability:

• Low: 7% of codewords can be restored.
• Medium: 15% of codewords can be restored.
• Quartile: 25% of codewords can be restored.
• High: 30% of codewords can be restored.

Transform a string into a result Error or a QRCode using Quartile ErrorCorrection.

Transform a string with a given ErrorCorrection into a result Error or a QRCode.

Transform a QRCode into a svg element.

qrCodeView : String -> Html msg
qrCodeView message =
    QRCode.encode message
        |> Result.map QRCode.toSvg
        |> Result.withDefault
            (Html.text "Error while encoding to QRCode.")

Tip: You can determine the size of the generated svg setting width and height styles.

Same as toSvg, but without the quiet zone.

Transform a QRCode into a string.

"Hello World!"
    |> QRCode.encode
    |> Result.map QRCode.toString
    |> Result.withDefault "Error while encoding to QRCode."

Returns:

■■■■■■■ ■■■■  ■■■■■■■
■     ■ ■■■■  ■     ■
■ ■■■ ■ ■■■■■ ■ ■■■ ■
■ ■■■ ■ ■   ■ ■ ■■■ ■
■ ■■■ ■ ■■■■  ■ ■■■ ■
■     ■    ■  ■     ■
■■■■■■■ ■ ■ ■ ■■■■■■■
        ■ ■■
 ■■ ■ ■■  ■   ■ ■■■■■
■■ ■■■   ■■■■ ■■■  ■■
 ■ ■■ ■■ ■■■■■ ■■■■■■
 ■■      ■■■■   ■  ■
■  ■ ■■■  ■■■■ ■■
        ■■ ■■■    ■■
■■■■■■■ ■ ■    ■■ ■■■
■     ■  ■  ■  ■    ■
■ ■■■ ■ ■■■     ■
■ ■■■ ■   ■■  ■■■ ■■
■ ■■■ ■ ■ ■ ■ ■ ■ ■ ■
■     ■ ■  ■    ■  ■
■■■■■■■   ■■■  ■   ■■

Transform a QRCode into an Image. You can transform the Image into a PNG or BMP.

import Html
import Html.Attribute
import Image
import QRCode


viewQRCode : String -> Html msg
viewQRCode message =
    QRCode.encode message
        |> Result.map
            (\qrCode ->
                Html.img
                    [ QRCode.toImage qrCode
                        |> Image.toPngUrl
                        |> Html.Attribute.src
                    ]
                    []
            )
        |> Result.withDefault
            (Html.text "Error while encoding to QRCode.")

Note: You must install the justgook/elm-image package in order to use the functions to convert the Image type to something else:

elm install "justgook/elm-image"

Transform a QRCode into an Image with an ImageOptions.

Available options to transform a QRCode into an Image with toImageWithOptions.

• moduleSize is the size of the module (the dark square) in px;
• moduleColor and emptyColor expects an Int as 0xRRGGBBAA;
• quietZoneSize is the number of modules the quiet zone should have.

Default options used by toImage.

defaultImageOptions =
    { moduleSize = 5
    , moduleColor = 0xFF
    , emptyColor = 0xFFFFFFFF
    , quietZoneSize = 4
    }

Transform a QRCode into a list of list of booleans.

"Hello World!"
    |> QRCode.encode
    |> Result.map QRCode.toMatrix
    |> Result.withDefault "Error while encoding to QRCode."

Possible encoding errors.