justin/qr_labels
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This commit is contained in:
Justin Hawkins
2026-04-28 09:45:18 +09:30
parent 122bde2193
commit 04ece93ad7
1 changed files with 42 additions and 12 deletions
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54
main.go
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@@ -12,9 +12,9 @@ import (
// 1 // 1
var cols = 4 var cols = 4
var rows = 7 var rows = 5
var qrSize = 35 var qrSize = 40
var offset = qrSize/2 + 5 var fontSize = 20
func main() { func main() {
qrc, err := qrcode.New("https://nanocat.net") qrc, err := qrcode.New("https://nanocat.net")
@@ -25,6 +25,8 @@ func main() {
b := newBWC() b := newBWC()
qrBytes := standard.NewWithWriter(&b, qrBytes := standard.NewWithWriter(&b,
// standard.WithQRWidth(uint8(qrSize)),
standard.WithBorderWidth(0),
standard.WithBuiltinImageEncoder(standard.PNG_FORMAT), standard.WithBuiltinImageEncoder(standard.PNG_FORMAT),
standard.WithCircleShape(), standard.WithCircleShape(),
standard.WithFgGradient(&standard.LinearGradient{ standard.WithFgGradient(&standard.LinearGradient{
@@ -53,8 +55,10 @@ func main() {
if err = qrc.Save(qrBytes); err != nil { if err = qrc.Save(qrBytes); err != nil {
fmt.Printf("could not save image: %v", err) fmt.Printf("could not save image: %v", err)
} }
// dim := qrc.Dimension()
pdf := fpdf.New("P", "mm", "A4", "") pdf := fpdf.New("P", "mm", "A4", "")
pdf.SetMargins(0, 0, 0)
pageWidth, pageHeight := pdf.GetPageSize() pageWidth, pageHeight := pdf.GetPageSize()
// register the qr // register the qr
@@ -64,8 +68,11 @@ func main() {
AllowNegativePosition: false, AllowNegativePosition: false,
}, b) }, b)
info := pdf.GetImageInfo("qr")
// panic(info.Height())
pdf.AddPage() pdf.AddPage()
pdf.SetFont("Arial", "B", 16) pdf.SetFont("Arial", "B", float64(fontSize))
text := "foobar" text := "foobar"
textWidth := pdf.GetStringWidth(text) textWidth := pdf.GetStringWidth(text)
@@ -73,16 +80,39 @@ func main() {
colWidth := pageWidth / float64(cols) colWidth := pageWidth / float64(cols)
rowHeight := pageHeight / float64(rows) rowHeight := pageHeight / float64(rows)
for i := 0; i < rows; i++ { for rowIdx := range rows {
for j := 0; j < cols; j++ { for colIdx := range cols {
pdf.Text(colWidth*float64(j)+colWidth/2-textWidth/2, topLeftX := colWidth * float64(colIdx)
rowHeight*float64(i)+rowHeight/2-float64(offset), topLeftY := rowHeight * float64(rowIdx)
text)
pdf.Image("qr", // if rowHeight*0.8 < float64(qrSize) {
colWidth*float64(j)+colWidth/2-float64(qrSize)/2, rowHeight*float64(i)+rowHeight/2+float64(offset), // panic("row too small for qr")
// }
// if colWidth*0.6 < float64(qrSize) {
// panic("col too small for qr")
// }
// label at the top
pdf.Text(
topLeftX+colWidth/2-textWidth/2,
topLeftY+float64(fontSize),
text, // +fmt.Sprintf("%d/%d", rowIdx, colIdx)
)
info.Height()
// pdf at the bottom
pdf.ImageOptions("qr",
topLeftX+info.Width()-float64(qrSize), //+float64(dim)/2, // centre
topLeftY+float64(fontSize)*1.3, // centre
float64(qrSize), float64(qrSize), float64(qrSize), float64(qrSize),
false, "tp", 0, "") false,
fpdf.ImageOptions{AllowNegativePosition: true}, 0, "")
// pdf.Image("qr",
// topLeftX+5, // centre
// topLeftY+float64(fontSize)*1.3, // centre
// float64(qrSize),
// float64(qrSize),
// false, "tp", 0, "")
} }
} }