276 lines
6.1 KiB
Go
276 lines
6.1 KiB
Go
package main
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import (
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"errors"
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"html/template"
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"image"
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"image/color"
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"image/draw"
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"image/png"
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"log"
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"net/http"
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"os"
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"strconv"
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"github.com/boombuler/barcode"
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"github.com/boombuler/barcode/qr"
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"janouch.name/sklad/bdf"
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"janouch.name/sklad/ql"
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)
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// scaler is a scaling image.Image wrapper.
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type scaler struct {
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image image.Image
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scale int
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}
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// ColorModel implements image.Image.
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func (s *scaler) ColorModel() color.Model {
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return s.image.ColorModel()
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}
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// Bounds implements image.Image.
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func (s *scaler) Bounds() image.Rectangle {
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r := s.image.Bounds()
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return image.Rect(r.Min.X*s.scale, r.Min.Y*s.scale,
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r.Max.X*s.scale, r.Max.Y*s.scale)
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}
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// At implements image.Image.
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func (s *scaler) At(x, y int) color.Color {
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if x < 0 {
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x = x - s.scale + 1
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}
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if y < 0 {
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y = y - s.scale + 1
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}
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return s.image.At(x/s.scale, y/s.scale)
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}
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// leftRotate is a 90 degree rotating image.Image wrapper.
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type leftRotate struct {
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image image.Image
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}
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// ColorModel implements image.Image.
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func (lr *leftRotate) ColorModel() color.Model {
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return lr.image.ColorModel()
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}
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// Bounds implements image.Image.
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func (lr *leftRotate) Bounds() image.Rectangle {
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r := lr.image.Bounds()
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// Min is inclusive, Max is exclusive.
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return image.Rect(r.Min.Y, -(r.Max.X - 1), r.Max.Y, -(r.Min.X - 1))
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}
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// At implements image.Image.
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func (lr *leftRotate) At(x, y int) color.Color {
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return lr.image.At(-y, x)
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}
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// -----------------------------------------------------------------------------
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var font *bdf.Font
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func genLabelForHeight(text string, height, scale int) image.Image {
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// Create a scaled bitmap of the text label.
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textRect, _ := font.BoundString(text)
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textImg := image.NewRGBA(textRect)
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draw.Draw(textImg, textRect, image.White, image.ZP, draw.Src)
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font.DrawString(textImg, image.ZP, text)
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scaledTextImg := scaler{image: textImg, scale: scale}
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scaledTextRect := scaledTextImg.Bounds()
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remains := height - scaledTextRect.Dy() - 20
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width := scaledTextRect.Dx()
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if remains > width {
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width = remains
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}
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// Create a scaled bitmap of the QR code.
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qrImg, _ := qr.Encode(text, qr.H, qr.Auto)
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qrImg, _ = barcode.Scale(qrImg, remains, remains)
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qrRect := qrImg.Bounds()
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// Combine.
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combinedRect := image.Rect(0, 0, width, height)
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combinedImg := image.NewRGBA(combinedRect)
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draw.Draw(combinedImg, combinedRect, image.White, image.ZP, draw.Src)
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draw.Draw(combinedImg,
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combinedRect.Add(image.Point{X: (width - qrRect.Dx()) / 2, Y: 0}),
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qrImg, image.ZP, draw.Src)
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target := image.Rect(
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(width-scaledTextRect.Dx())/2, qrRect.Dy()+20,
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combinedRect.Max.X, combinedRect.Max.Y)
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draw.Draw(combinedImg, target, &scaledTextImg, scaledTextRect.Min, draw.Src)
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return combinedImg
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}
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var tmpl = template.Must(template.New("form").Parse(`
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<!DOCTYPE html>
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<html><body>
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<h1>PT-CBP label printing tool</h1>
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<table><tr>
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<td valign=top>
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<img border=1 src='?img&scale={{.Scale}}&text={{.Text}}'>
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</td>
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<td valign=top>
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<fieldset>
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{{ if .Printer }}
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<p>Printer: {{ .Printer.Manufacturer }} {{ .Printer.Model }}
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<p>Tape:
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{{ if .Printer.LastStatus }}
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{{ .Printer.LastStatus.MediaWidthMM }} mm ×
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{{ .Printer.LastStatus.MediaLengthMM }} mm
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{{ if .MediaInfo }}
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(offset: {{ .MediaInfo.SideMarginPins }} pt,
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print area: {{ .MediaInfo.PrintAreaPins }} pt)
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{{ else }}
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(unknown media)
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{{ end }}
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{{ if .Printer.LastStatus.Errors }}
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{{ range .Printer.LastStatus.Errors }}
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<p>Error: {{ . }}
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{{ end }}
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{{ end }}
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{{ end }}
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{{ if .InitErr }}
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{{ .InitErr }}
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{{ end }}
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{{ else }}
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<p>Error: {{ .PrinterErr }}
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{{ end }}
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</fieldset>
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<form><fieldset>
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<p><label for=text>Text:</label>
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<input id=text name=text value='{{.Text}}'>
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<label for=scale>Scale:</label>
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<input id=scale name=scale value='{{.Scale}}' size=1>
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<p><input type=submit value='Update'>
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<input type=submit name=print value='Update and Print'>
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</fieldset></form>
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</td>
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</tr></table>
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</body></html>
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`))
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func getPrinter() (*ql.Printer, error) {
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printer, err := ql.Open()
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if err != nil {
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return nil, err
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}
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if printer == nil {
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return nil, errors.New("no suitable printer found")
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}
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return printer, nil
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}
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func getStatus(printer *ql.Printer) error {
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if err := printer.Initialize(); err != nil {
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return err
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}
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if err := printer.UpdateStatus(); err != nil {
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return err
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}
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log.Printf("status\n%s", printer.LastStatus)
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return nil
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}
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func handle(w http.ResponseWriter, r *http.Request) {
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if err := r.ParseForm(); err != nil {
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http.Error(w, err.Error(), 500)
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return
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}
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var initErr error
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printer, printerErr := getPrinter()
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if printerErr == nil {
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defer printer.Close()
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initErr = getStatus(printer)
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}
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var mediaInfo *ql.MediaInfo
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if printer.LastStatus != nil {
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mediaInfo = ql.GetMediaInfo(printer.LastStatus.MediaWidthMM(),
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printer.LastStatus.MediaLengthMM())
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}
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var params = struct {
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Printer *ql.Printer
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PrinterErr error
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InitErr error
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MediaInfo *ql.MediaInfo
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Text string
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Scale int
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}{
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Printer: printer,
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PrinterErr: printerErr,
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InitErr: initErr,
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MediaInfo: mediaInfo,
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Text: r.FormValue("text"),
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}
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var err error
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params.Scale, err = strconv.Atoi(r.FormValue("scale"))
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if err != nil {
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params.Scale = 3
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}
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var label image.Image
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if mediaInfo != nil {
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label = &leftRotate{image: genLabelForHeight(
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params.Text, mediaInfo.PrintAreaPins, params.Scale)}
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if r.FormValue("print") != "" {
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if err := printer.Print(label); err != nil {
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log.Println("print error:", err)
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}
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}
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}
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if _, ok := r.Form["img"]; !ok {
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w.Header().Set("Content-Type", "text/html")
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tmpl.Execute(w, ¶ms)
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return
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}
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if mediaInfo == nil {
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http.Error(w, "unknown media", 500)
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return
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}
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w.Header().Set("Content-Type", "image/png")
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if err := png.Encode(w, label); err != nil {
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http.Error(w, err.Error(), 500)
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return
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}
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}
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func main() {
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var err error
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fi, err := os.Open("../../ucs-fonts-75dpi100dpi/100dpi/luBS24.bdf")
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if err != nil {
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log.Fatalln(err)
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}
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font, err = bdf.NewFromBDF(fi)
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if err != nil {
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log.Fatalln(err)
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}
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if err := fi.Close(); err != nil {
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log.Fatalln(err)
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}
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log.Println("Starting server")
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http.HandleFunc("/", handle)
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log.Fatal(http.ListenAndServe(":8080", nil))
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}
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