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Improve the label printing experimental tool

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Now it should be safer to print on die-cut labels,
or even any supported label at all.
This commit is contained in:
Přemysl Eric Janouch
2019-04-12 19:22:27 +02:00
parent 8c0a5195fc
commit b763c2d362
2 changed files with 196 additions and 113 deletions
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216
label-exp/main.go
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@@ -168,11 +168,14 @@ func printStatusInformation(d []byte) {
}
// genLabelData converts an image to the printer's raster format.
func genLabelData(src image.Image, offset int) (data []byte) {
// TODO: Margins? For 29mm, it's 6 pins from the start, 306 printing pins.
func genLabelData(src image.Image, offset, length int) (data []byte) {
bounds := src.Bounds()
pixels := make([]bool, 720)
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
length--
if length <= 0 {
break
}
off := offset
for x := bounds.Max.X - 1; x >= bounds.Min.X; x-- {
// TODO: Anything to do with the ColorModel?
@@ -193,10 +196,15 @@ func genLabelData(src image.Image, offset int) (data []byte) {
data = append(data, b)
}
}
for ; length > 0; length-- {
data = append(data, 'g', 0x00, 90)
data = append(data, make([]byte, 90)...)
}
return
}
func printLabel(src image.Image) error {
func printLabel(printer *ql.Printer, src image.Image,
status *ql.Status, mediaInfo *ql.MediaInfo) error {
data := []byte(nil)
// Raster mode.
@@ -208,7 +216,17 @@ func printLabel(src image.Image) error {
// Print information command.
dy := src.Bounds().Dy()
data = append(data, 0x1b, 0x69, 0x7a, 0x02|0x04|0x40|0x80, 0x0a, 29, 0,
if mediaInfo.PrintAreaLength != 0 {
dy = mediaInfo.PrintAreaLength
}
mediaType := byte(0x0a)
if status.MediaLengthMM != 0 {
mediaType = byte(0x0b)
}
data = append(data, 0x1b, 0x69, 0x7a, 0x02|0x04|0x40|0x80, mediaType,
byte(status.MediaWidthMM), byte(status.MediaLengthMM),
byte(dy), byte(dy>>8), byte(dy>>16), byte(dy>>24), 0, 0x00)
// Auto cut, each 1 label.
@@ -219,41 +237,26 @@ func printLabel(src image.Image) error {
// Not sure what it means, doesn't seem to have any effect to turn it off.
data = append(data, 0x1b, 0x69, 0x4b, 0x08)
// 3mm margins along the direction of feed. 0x23 = 35 dots, the minimum.
data = append(data, 0x1b, 0x69, 0x64, 0x23, 0x00)
if status.MediaLengthMM != 0 {
// 3mm margins along the direction of feed. 0x23 = 35 dots, the minimum.
data = append(data, 0x1b, 0x69, 0x64, 0x23, 0x00)
} else {
// May not set anything other than zero.
data = append(data, 0x1b, 0x69, 0x64, 0x00, 0x00)
}
// Compression mode: no compression.
// Should be the only supported mode for QL-800.
data = append(data, 0x4d, 0x00)
// The graphics data itself.
data = append(data, genLabelData(src, 6)...)
data = append(data, genLabelData(src, mediaInfo.SideMarginPins, dy)...)
// Print command with feeding.
data = append(data, 0x1a)
// ---
printer, err := ql.Open()
if err != nil {
return err
}
if printer == nil {
return errors.New("no suitable printer found")
}
defer printer.Close()
if err := printer.Initialize(); err != nil {
return err
}
status, err := printer.GetStatus()
if err != nil {
return err
}
printStatusInformation(status)
// Print the prepared data.
if _, err := printer.File.Write(data); err != nil {
return err
@@ -263,19 +266,19 @@ func printLabel(src image.Image) error {
// state, and try to figure out something from the statuses.
// We may also receive an error status instead of the transition to
// the printing state. Or even after it.
start := time.Now()
start, b := time.Now(), make([]byte, 32)
for {
if time.Now().Sub(start) > 3*time.Second {
break
}
if n, err := printer.File.Read(status); err == io.EOF {
if n, err := printer.File.Read(b); err == io.EOF {
time.Sleep(100 * time.Millisecond)
} else if err != nil {
return err
} else if n < 32 {
return errors.New("invalid read")
} else {
printStatusInformation(status)
printStatusInformation(b)
}
}
return nil
@@ -285,47 +288,14 @@ func printLabel(src image.Image) error {
var font *bdf.Font
func genLabel(text string, width int) image.Image {
// Create a scaled bitmap of the QR code.
qrImg, _ := qr.Encode(text, qr.H, qr.Auto)
qrImg, _ = barcode.Scale(qrImg, width, width)
qrRect := qrImg.Bounds()
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)
// TODO: We can scale as needed to make the text fit.
scaledTextImg := scaler{image: textImg, scale: 3}
scaledTextRect := scaledTextImg.Bounds()
// Combine.
combinedRect := qrRect
combinedRect.Max.Y += scaledTextRect.Dy() + 20
combinedImg := image.NewRGBA(combinedRect)
draw.Draw(combinedImg, combinedRect, image.White, image.ZP, draw.Src)
draw.Draw(combinedImg, combinedRect, qrImg, image.ZP, draw.Src)
target := image.Rect(
(width-scaledTextRect.Dx())/2, qrRect.Dy()+10,
combinedRect.Max.X, combinedRect.Max.Y)
draw.Draw(combinedImg, target, &scaledTextImg, scaledTextRect.Min, draw.Src)
return combinedImg
}
func genLabelForHeight(text string, height 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)
// TODO: Make it possible to choose scale, or use some heuristic.
scaledTextImg := scaler{image: textImg, scale: 3}
//scaledTextImg := scaler{image: textImg, scale: 3}
scaledTextImg := scaler{image: textImg, scale: scale}
scaledTextRect := scaledTextImg.Bounds()
remains := height - scaledTextRect.Dy() - 20
@@ -358,16 +328,48 @@ func genLabelForHeight(text string, height int) image.Image {
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;width={{.Width}}&amp;text={{.Text}}'>
<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 .Status }}
{{ .Status.MediaWidthMM }} mm &times;
{{ .Status.MediaLengthMM }} mm
{{ if .MediaInfo }}
(offset: {{ .MediaInfo.SideMarginPins }} pt,
print area: {{ .MediaInfo.PrintAreaPins }} pt)
{{ else }}
(unknown media)
{{ end }}
{{ if .Status.Errors }}
{{ range .Status.Errors }}
<p>Error: {{ . }}
{{ end }}
{{ end }}
{{ end }}
{{ if .InitErr }}
{{ .InitErr }}
{{ end }}
{{ else }}
<p>Error: {{ .PrinterErr }}
{{ end }}
</fieldset>
<form><fieldset>
<p><label for=width>Tape width in pt:</label>
<input id=width name=width value='{{.Width}}'>
<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>
@@ -376,31 +378,82 @@ var tmpl = template.Must(template.New("form").Parse(`
</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) (*ql.Status, error) {
if err := printer.Initialize(); err != nil {
return nil, err
}
if data, err := printer.GetStatus(); err != nil {
return nil, err
} else {
printStatusInformation(data)
return ql.DecodeStatus(data), nil
}
}
func handle(w http.ResponseWriter, r *http.Request) {
if err := r.ParseForm(); err != nil {
http.Error(w, err.Error(), 500)
return
}
var (
status *ql.Status
initErr error
)
printer, printerErr := getPrinter()
if printerErr == nil {
defer printer.Close()
status, initErr = getStatus(printer)
}
var mediaInfo *ql.MediaInfo
if status != nil {
mediaInfo = ql.GetMediaInfo(status.MediaWidthMM, status.MediaLengthMM)
}
var params = struct {
Width int
Text string
Printer *ql.Printer
PrinterErr error
Status *ql.Status
InitErr error
MediaInfo *ql.MediaInfo
Text string
Scale int
}{
Text: r.FormValue("text"),
Printer: printer,
PrinterErr: printerErr,
Status: status,
InitErr: initErr,
MediaInfo: mediaInfo,
Text: r.FormValue("text"),
}
var err error
params.Width, err = strconv.Atoi(r.FormValue("width"))
params.Scale, err = strconv.Atoi(r.FormValue("scale"))
if err != nil {
params.Width = 306 // Default to 29mm tape.
params.Scale = 3
}
// TODO: Possibly just remove the for-width mode.
label := genLabel(params.Text, params.Width)
label = &leftRotate{image: genLabelForHeight(params.Text, params.Width)}
if r.FormValue("print") != "" {
if err := printLabel(label); err != nil {
log.Println("print error:", err)
var label image.Image
if mediaInfo != nil {
label = &leftRotate{image: genLabelForHeight(
params.Text, mediaInfo.PrintAreaPins, params.Scale)}
if r.FormValue("print") != "" {
if err := printLabel(
printer, label, status, mediaInfo); err != nil {
log.Println("print error:", err)
}
}
}
@@ -410,6 +463,11 @@ func handle(w http.ResponseWriter, r *http.Request) {
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)