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Diffstat (limited to 'label-exp/main.go')
-rw-r--r--label-exp/main.go66
1 files changed, 64 insertions, 2 deletions
diff --git a/label-exp/main.go b/label-exp/main.go
index 3280733..b530f2f 100644
--- a/label-exp/main.go
+++ b/label-exp/main.go
@@ -49,6 +49,28 @@ func (s *scaler) At(x, y int) color.Color {
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)
+}
+
// -----------------------------------------------------------------------------
func decodeBitfieldErrors(b byte, errors [8]string) []string {
@@ -289,11 +311,10 @@ func printLabel(src image.Image) error {
var font *bdf.Font
-// TODO: By rotating the label we can make it smaller, as an alternate mode.
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, 306, 306)
+ qrImg, _ = barcode.Scale(qrImg, width, width)
qrRect := qrImg.Bounds()
// Create a scaled bitmap of the text label.
@@ -321,6 +342,45 @@ func genLabel(text string, width int) image.Image {
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}
+ 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>
@@ -361,7 +421,9 @@ func handle(w http.ResponseWriter, r *http.Request) {
params.Width = 306 // Default to 29mm tape.
}
+ // 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)