diff options
Diffstat (limited to 'contrib/barcode')
| -rw-r--r-- | contrib/barcode/barcode.go | 38 |
1 files changed, 25 insertions, 13 deletions
diff --git a/contrib/barcode/barcode.go b/contrib/barcode/barcode.go index e49ac53..4a143da 100644 --- a/contrib/barcode/barcode.go +++ b/contrib/barcode/barcode.go @@ -20,6 +20,10 @@ package barcode import ( "bytes" "errors" + "image/jpeg" + "io" + "strconv" + "github.com/boombuler/barcode" "github.com/boombuler/barcode/codabar" "github.com/boombuler/barcode/code128" @@ -29,20 +33,28 @@ import ( "github.com/boombuler/barcode/qr" "github.com/boombuler/barcode/twooffive" "github.com/jung-kurt/gofpdf" - "image/jpeg" - "strconv" ) // barcodes represents the barcodes that have been registered through this // package. They will later be used to be scaled and put on the page. var barcodes map[string]barcode.Barcode +// barcodePdf is a partial PDF implementation that only implements a subset of +// functions that are required to add the barcode to the PDF. +type barcodePdf interface { + GetConversionRatio() float64 + GetImageInfo(imageStr string) *gofpdf.ImageInfoType + Image(imageNameStr string, x, y, w, h float64, flow bool, tp string, link int, linkStr string) + RegisterImageReader(imgName, tp string, r io.Reader) *gofpdf.ImageInfoType + SetError(err error) +} + // Barcode puts a registered barcode in the current page. // // The size should be specified in the units used to create the PDF document. // // Positioning with x, y and flow is inherited from Fpdf.Image(). -func Barcode(pdf *gofpdf.Fpdf, code string, x, y, w, h float64, flow bool) { +func Barcode(pdf barcodePdf, code string, x, y, w, h float64, flow bool) { unscaled, ok := barcodes[code] if !ok { @@ -90,14 +102,14 @@ func Register(bcode barcode.Barcode) string { // RegisterCodabar registers a barcode of type Codabar to the PDF, but not to // the page. Use Barcode() with the return value to put the barcode on the page. -func RegisterCodabar(pdf *gofpdf.Fpdf, code string) string { +func RegisterCodabar(pdf barcodePdf, code string) string { bcode, err := codabar.Encode(code) return registerBarcode(pdf, bcode, err) } // RegisterCode128 registers a barcode of type Code128 to the PDF, but not to // the page. Use Barcode() with the return value to put the barcode on the page. -func RegisterCode128(pdf *gofpdf.Fpdf, code string) string { +func RegisterCode128(pdf barcodePdf, code string) string { bcode, err := code128.Encode(code) return registerBarcode(pdf, bcode, err) } @@ -106,7 +118,7 @@ func RegisterCode128(pdf *gofpdf.Fpdf, code string) string { // the page. Use Barcode() with the return value to put the barcode on the page. // // includeChecksum and fullASCIIMode are inherited from code39.Encode(). -func RegisterCode39(pdf *gofpdf.Fpdf, code string, includeChecksum, fullASCIIMode bool) string { +func RegisterCode39(pdf barcodePdf, code string, includeChecksum, fullASCIIMode bool) string { bcode, err := code39.Encode(code, includeChecksum, fullASCIIMode) return registerBarcode(pdf, bcode, err) } @@ -114,7 +126,7 @@ func RegisterCode39(pdf *gofpdf.Fpdf, code string, includeChecksum, fullASCIIMod // RegisterDataMatrix registers a barcode of type DataMatrix to the PDF, but not // to the page. Use Barcode() with the return value to put the barcode on the // page. -func RegisterDataMatrix(pdf *gofpdf.Fpdf, code string) string { +func RegisterDataMatrix(pdf barcodePdf, code string) string { bcode, err := datamatrix.Encode(code) return registerBarcode(pdf, bcode, err) } @@ -122,7 +134,7 @@ func RegisterDataMatrix(pdf *gofpdf.Fpdf, code string) string { // RegisterEAN registers a barcode of type EAN to the PDF, but not to the page. // It will automatically detect if the barcode is EAN8 or EAN13. Use Barcode() // with the return value to put the barcode on the page. -func RegisterEAN(pdf *gofpdf.Fpdf, code string) string { +func RegisterEAN(pdf barcodePdf, code string) string { bcode, err := ean.Encode(code) return registerBarcode(pdf, bcode, err) } @@ -131,7 +143,7 @@ func RegisterEAN(pdf *gofpdf.Fpdf, code string) string { // Use Barcode() with the return value to put the barcode on the page. // // The ErrorCorrectionLevel and Encoding mode are inherited from qr.Encode(). -func RegisterQR(pdf *gofpdf.Fpdf, code string, ecl qr.ErrorCorrectionLevel, mode qr.Encoding) string { +func RegisterQR(pdf barcodePdf, code string, ecl qr.ErrorCorrectionLevel, mode qr.Encoding) string { bcode, err := qr.Encode(code, ecl, mode) return registerBarcode(pdf, bcode, err) } @@ -141,7 +153,7 @@ func RegisterQR(pdf *gofpdf.Fpdf, code string, ecl qr.ErrorCorrectionLevel, mode // page. // // The interleaved bool is inherited from twooffive.Encode(). -func RegisterTwoOfFive(pdf *gofpdf.Fpdf, code string, interleaved bool) string { +func RegisterTwoOfFive(pdf barcodePdf, code string, interleaved bool) string { bcode, err := twooffive.Encode(code, interleaved) return registerBarcode(pdf, bcode, err) } @@ -150,7 +162,7 @@ func RegisterTwoOfFive(pdf *gofpdf.Fpdf, code string, interleaved bool) string { // In case of an error generating the barcode it will not be registered and will // set an error on the PDF. It will return a unique key for the barcode type and // content that can be used to put the barcode on the page. -func registerBarcode(pdf *gofpdf.Fpdf, bcode barcode.Barcode, err error) string { +func registerBarcode(pdf barcodePdf, bcode barcode.Barcode, err error) string { if err != nil { pdf.SetError(err) } @@ -178,7 +190,7 @@ func barcodeKey(bcode barcode.Barcode) string { // registerScaledBarcode registers a barcode with its exact dimensions to the // PDF but does not put it on the page. Use Fpdf.Image() with the same code to // add the barcode to the page. -func registerScaledBarcode(pdf *gofpdf.Fpdf, code string, bcode barcode.Barcode) error { +func registerScaledBarcode(pdf barcodePdf, code string, bcode barcode.Barcode) error { buf := new(bytes.Buffer) err := jpeg.Encode(buf, bcode, nil) @@ -199,6 +211,6 @@ func registerScaledBarcode(pdf *gofpdf.Fpdf, code string, bcode barcode.Barcode) // Doing this through the Fpdf.Image() function would mean that it uses a 72 DPI // value and stretches it to a 96 DPI value. This results in quality loss which // could be problematic for barcode scanners. -func convertTo96Dpi(pdf *gofpdf.Fpdf, value float64) float64 { +func convertTo96Dpi(pdf barcodePdf, value float64) float64 { return value * pdf.GetConversionRatio() / 72 * 96 } |