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74 lines
2.0 KiB
Go
74 lines
2.0 KiB
Go
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package qrcode
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import (
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"errors"
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"image/color"
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"github.com/ajstarks/svgo"
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"github.com/boombuler/barcode"
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)
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// QrSVG holds the data related to the size, location,
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// and block size of the QR Code. Holds unexported fields.
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type QrSVG struct {
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qr barcode.Barcode
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qrWidth int
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blockSize int
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startingX int
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startingY int
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}
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// NewQrSVG contructs a QrSVG struct. It takes a QR Code in the form
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// of barcode.Barcode and sets the "pixel" or block size of QR Code in
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// the SVG file.
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func NewQrSVG(qr barcode.Barcode, blockSize int) QrSVG {
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return QrSVG{
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qr: qr,
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qrWidth: qr.Bounds().Max.X,
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blockSize: blockSize,
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startingX: 0,
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startingY: 0,
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}
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}
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// WriteQrSVG writes the QR Code to SVG.
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func (qs *QrSVG) WriteQrSVG(s *svg.SVG) error {
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if qs.qr.Metadata().CodeKind == "QR Code" {
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currY := qs.startingY
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for x := 0; x < qs.qrWidth; x++ {
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currX := qs.startingX
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for y := 0; y < qs.qrWidth; y++ {
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if qs.qr.At(x, y) == color.Black {
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s.Rect(currX, currY, qs.blockSize, qs.blockSize, "class=\"color\"")
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} else if qs.qr.At(x, y) == color.White {
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s.Rect(currX, currY, qs.blockSize, qs.blockSize, "class=\"bg-color\"")
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}
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currX += qs.blockSize
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}
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currY += qs.blockSize
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}
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return nil
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}
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return errors.New("can not write to SVG: Not a QR code")
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}
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// SetStartPoint sets the top left start point of QR Code.
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// This takes an X and Y value and then adds four white "blocks"
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// to create the "quiet zone" around the QR Code.
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func (qs *QrSVG) SetStartPoint(x, y int) {
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qs.startingX = x + (qs.blockSize * 4)
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qs.startingY = y + (qs.blockSize * 4)
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}
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// StartQrSVG creates a start for writing an SVG file that
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// only contains a barcode. This is similar to the svg.Start() method.
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// This fucntion should only be used if you only want to write a QR code
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// to the SVG. Otherwise use the regular svg.Start() method to start your
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// SVG file.
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func (qs *QrSVG) StartQrSVG(s *svg.SVG) {
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width := (qs.qrWidth * qs.blockSize) + (qs.blockSize * 8)
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qs.SetStartPoint(0, 0)
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s.Start(width, width)
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}
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