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package main
import (
"errors"
"html/template"
"image"
"image/draw"
"image/png"
"log"
"net/http"
"os"
"strconv"
"github.com/boombuler/barcode"
"github.com/boombuler/barcode/qr"
"janouch.name/sklad/bdf"
"janouch.name/sklad/imgutil"
"janouch.name/sklad/ql"
)
var font *bdf.Font
func genLabelForHeight(text string, height, scale int) image.Image {
// Create a scaled bitmap of the text label.
textRect, _ := font.BoundString(text)
textImg := image.NewRGBA(textRect)
draw.Draw(textImg, textRect, image.White, image.ZP, draw.Src)
font.DrawString(textImg, image.ZP, text)
scaledTextImg := imgutil.Scale{Image: textImg, Scale: scale}
scaledTextRect := scaledTextImg.Bounds()
remains := height - scaledTextRect.Dy() - 20
width := scaledTextRect.Dx()
if remains > width {
width = remains
}
// Create a scaled bitmap of the QR code.
qrImg, _ := qr.Encode(text, qr.H, qr.Auto)
qrImg, _ = barcode.Scale(qrImg, remains, remains)
qrRect := qrImg.Bounds()
// Combine.
combinedRect := image.Rect(0, 0, width, height)
combinedImg := image.NewRGBA(combinedRect)
draw.Draw(combinedImg, combinedRect, image.White, image.ZP, draw.Src)
draw.Draw(combinedImg,
combinedRect.Add(image.Point{X: (width - qrRect.Dx()) / 2, Y: 0}),
qrImg, image.ZP, draw.Src)
target := image.Rect(
(width-scaledTextRect.Dx())/2, qrRect.Dy()+20,
combinedRect.Max.X, combinedRect.Max.Y)
draw.Draw(combinedImg, target, &scaledTextImg, scaledTextRect.Min, draw.Src)
return combinedImg
}
var tmpl = template.Must(template.New("form").Parse(`
<!DOCTYPE html>
<html><body>
<h1>PT-CBP label printing tool</h1>
<table><tr>
<td valign=top>
<img border=1 src='?img&scale={{.Scale}}&text={{.Text}}'>
</td>
<td valign=top>
<fieldset>
{{ if .Printer }}
<p>Printer: {{ .Printer.Manufacturer }} {{ .Printer.Model }}
<p>Tape:
{{ if .Printer.LastStatus }}
{{ .Printer.LastStatus.MediaWidthMM }} mm ×
{{ .Printer.LastStatus.MediaLengthMM }} mm
{{ if .MediaInfo }}
(offset: {{ .MediaInfo.SideMarginPins }} pt,
print area: {{ .MediaInfo.PrintAreaPins }} pt)
{{ else }}
(unknown media)
{{ end }}
{{ if .Printer.LastStatus.Errors }}
{{ range .Printer.LastStatus.Errors }}
<p>Error: {{ . }}
{{ end }}
{{ end }}
{{ end }}
{{ if .InitErr }}
{{ .InitErr }}
{{ end }}
{{ else }}
<p>Error: {{ .PrinterErr }}
{{ end }}
</fieldset>
<fieldset>
<p>Font: {{ .Font.Name }}
</fieldset>
<form><fieldset>
<p><label for=text>Text:</label>
<input id=text name=text value='{{.Text}}'>
<label for=scale>Scale:</label>
<input id=scale name=scale value='{{.Scale}}' size=1>
<p><input type=submit value='Update'>
<input type=submit name=print value='Update and Print'>
</fieldset></form>
</td>
</tr></table>
</body></html>
`))
func getPrinter() (*ql.Printer, error) {
printer, err := ql.Open()
if err != nil {
return nil, err
}
if printer == nil {
return nil, errors.New("no suitable printer found")
}
return printer, nil
}
func getStatus(printer *ql.Printer) error {
if err := printer.Initialize(); err != nil {
return err
}
if err := printer.UpdateStatus(); err != nil {
return err
}
return nil
}
func handle(w http.ResponseWriter, r *http.Request) {
if err := r.ParseForm(); err != nil {
http.Error(w, err.Error(), 500)
return
}
var (
initErr error
mediaInfo *ql.MediaInfo
)
printer, printerErr := getPrinter()
if printerErr == nil {
defer printer.Close()
printer.StatusNotify = func(status *ql.Status) {
log.Printf("\x1b[1mreceived status\x1b[m\n%s", status)
}
if initErr = getStatus(printer); initErr == nil {
mediaInfo = ql.GetMediaInfo(
printer.LastStatus.MediaWidthMM(),
printer.LastStatus.MediaLengthMM(),
)
}
}
var params = struct {
Printer *ql.Printer
PrinterErr error
InitErr error
MediaInfo *ql.MediaInfo
Font *bdf.Font
Text string
Scale int
}{
Printer: printer,
PrinterErr: printerErr,
InitErr: initErr,
MediaInfo: mediaInfo,
Font: font,
Text: r.FormValue("text"),
}
var err error
params.Scale, err = strconv.Atoi(r.FormValue("scale"))
if err != nil {
params.Scale = 3
}
var label image.Image
if mediaInfo != nil {
label = &imgutil.LeftRotate{Image: genLabelForHeight(
params.Text, mediaInfo.PrintAreaPins, params.Scale)}
if r.FormValue("print") != "" {
if err := printer.Print(label); err != nil {
log.Println("print error:", err)
}
}
}
if _, ok := r.Form["img"]; !ok {
w.Header().Set("Content-Type", "text/html")
tmpl.Execute(w, ¶ms)
return
}
if mediaInfo == nil {
http.Error(w, "unknown media", 500)
return
}
w.Header().Set("Content-Type", "image/png")
if err := png.Encode(w, label); err != nil {
http.Error(w, err.Error(), 500)
return
}
}
func main() {
if len(os.Args) != 3 {
log.Fatalf("usage: %s ADDRESS BDF-FILE\n", os.Args[0])
}
address, bdf_path := os.Args[1], os.Args[2]
var err error
fi, err := os.Open(bdf_path)
if err != nil {
log.Fatalln(err)
}
font, err = bdf.NewFromBDF(fi)
if err := fi.Close(); err != nil {
log.Fatalln(err)
}
if err != nil {
log.Fatalln(err)
}
log.Println("starting server")
http.HandleFunc("/", handle)
log.Fatal(http.ListenAndServe(address, nil))
}
|
