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sklad: import label printing capability from label-tool

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This commit is contained in:
Přemysl Eric Janouch
2019-04-14 21:25:21 +02:00
parent 4dade55387
commit ea45784554
4 changed files with 91 additions and 51 deletions
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52
label-tool/main.go
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@@ -4,60 +4,20 @@ 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/label"
"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>
@@ -183,12 +143,12 @@ func handle(w http.ResponseWriter, r *http.Request) {
params.Scale = 3
}
var label image.Image
var img image.Image
if mediaInfo != nil {
label = &imgutil.LeftRotate{Image: genLabelForHeight(
params.Text, mediaInfo.PrintAreaPins, params.Scale)}
img = &imgutil.LeftRotate{Image: label.GenLabelForHeight(
font, params.Text, mediaInfo.PrintAreaPins, params.Scale)}
if r.FormValue("print") != "" {
if err := printer.Print(label); err != nil {
if err := printer.Print(img); err != nil {
log.Println("print error:", err)
}
}
@@ -206,7 +166,7 @@ func handle(w http.ResponseWriter, r *http.Request) {
}
w.Header().Set("Content-Type", "image/png")
if err := png.Encode(w, label); err != nil {
if err := png.Encode(w, img); err != nil {
http.Error(w, err.Error(), 500)
return
}