Rename the label tool

author: Přemysl Janouch <p@janouch.name> 2019-04-12 23:50:05 +0200
committer: Přemysl Janouch <p@janouch.name> 2019-04-12 23:50:05 +0200
commit: ef904ccf8c244a725ccc5ec63e06d716a312eda8 (patch)
tree: 608ce6569c992e5326547274c381a8ff0a22253a /label-tool
parent: 89fc9d86c727aa8dc80232b461a7903a3c16d10e (diff)
download: sklad-ef904ccf8c244a725ccc5ec63e06d716a312eda8.tar.gz
sklad-ef904ccf8c244a725ccc5ec63e06d716a312eda8.tar.xz
sklad-ef904ccf8c244a725ccc5ec63e06d716a312eda8.zip
1 files changed, 280 insertions, 0 deletions
diff --git a/label-tool/main.go b/label-tool/main.go
new file mode 100644
index 0000000..dd4f8c2
--- /dev/null
+++ b/label-tool/main.go
@@ -0,0 +1,280 @@
+package main
+
+import (
+	"errors"
+	"html/template"
+	"image"
+	"image/color"
+	"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/ql"
+)
+
+// scaler is a scaling image.Image wrapper.
+type scaler struct {
+	image image.Image
+	scale int
+}
+
+// ColorModel implements image.Image.
+func (s *scaler) ColorModel() color.Model {
+	return s.image.ColorModel()
+}
+
+// Bounds implements image.Image.
+func (s *scaler) Bounds() image.Rectangle {
+	r := s.image.Bounds()
+	return image.Rect(r.Min.X*s.scale, r.Min.Y*s.scale,
+		r.Max.X*s.scale, r.Max.Y*s.scale)
+}
+
+// At implements image.Image.
+func (s *scaler) At(x, y int) color.Color {
+	if x < 0 {
+		x = x - s.scale + 1
+	}
+	if y < 0 {
+		y = y - s.scale + 1
+	}
+	return s.image.At(x/s.scale, y/s.scale)
+}
+
+// leftRotate is a 90 degree rotating image.Image wrapper.
+type leftRotate struct {
+	image image.Image
+}
+
+// ColorModel implements image.Image.
+func (lr *leftRotate) ColorModel() color.Model {
+	return lr.image.ColorModel()
+}
+
+// Bounds implements image.Image.
+func (lr *leftRotate) Bounds() image.Rectangle {
+	r := lr.image.Bounds()
+	// Min is inclusive, Max is exclusive.
+	return image.Rect(r.Min.Y, -(r.Max.X - 1), r.Max.Y, -(r.Min.X - 1))
+}
+
+// At implements image.Image.
+func (lr *leftRotate) At(x, y int) color.Color {
+	return lr.image.At(-y, x)
+}
+
+// -----------------------------------------------------------------------------
+
+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 := scaler{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&amp;scale={{.Scale}}&amp;text={{.Text}}'>
+	</td>
+	<td valign=top>
+		<fieldset>
+			{{ if .Printer }}
+
+			<p>Printer: {{ .Printer.Manufacturer }} {{ .Printer.Model }}
+			<p>Tape:
+			{{ if .Printer.LastStatus }}
+			{{ .Printer.LastStatus.MediaWidthMM }} mm &times;
+			{{ .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>
+		<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
+		Text       string
+		Scale      int
+	}{
+		Printer:    printer,
+		PrinterErr: printerErr,
+		InitErr:    initErr,
+		MediaInfo:  mediaInfo,
+		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 = &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, &params)
+		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() {
+	var err error
+	fi, err := os.Open("../../ucs-fonts-75dpi100dpi/100dpi/luBS24.bdf")
+	if err != nil {
+		log.Fatalln(err)
+	}
+	font, err = bdf.NewFromBDF(fi)
+	if err != nil {
+		log.Fatalln(err)
+	}
+	if err := fi.Close(); err != nil {
+		log.Fatalln(err)
+	}
+
+	log.Println("starting server")
+	http.HandleFunc("/", handle)
+	log.Fatal(http.ListenAndServe(":8080", nil))
+}
author	Přemysl Janouch <p@janouch.name>	2019-04-12 23:50:05 +0200
committer	Přemysl Janouch <p@janouch.name>	2019-04-12 23:50:05 +0200
commit	ef904ccf8c244a725ccc5ec63e06d716a312eda8 (patch)
tree	608ce6569c992e5326547274c381a8ff0a22253a /label-tool
parent	89fc9d86c727aa8dc80232b461a7903a3c16d10e (diff)
download	sklad-ef904ccf8c244a725ccc5ec63e06d716a312eda8.tar.gz sklad-ef904ccf8c244a725ccc5ec63e06d716a312eda8.tar.xz sklad-ef904ccf8c244a725ccc5ec63e06d716a312eda8.zip