add subtitle feature

This commit is contained in:
huttotw 2018-10-05 10:37:54 -04:00
parent 34fff276c7
commit 7674f452ee
2 changed files with 60 additions and 1 deletions

View File

@ -38,12 +38,15 @@ func main() {
// Scale the barcode to 200x200 pixels
qrCode, _ = barcode.Scale(qrCode, 200, 200)
// Optional: Add text to the bottom of the code
img := barcode.WithSubtitle(qrCode)
// create the output file
file, _ := os.Create("qrcode.png")
defer file.Close()
// encode the barcode as png
png.Encode(file, qrCode)
png.Encode(file, img)
}
```

56
subtitle.go Normal file
View File

@ -0,0 +1,56 @@
package barcode
import (
"image"
"image/color"
"image/draw"
"github.com/boombuler/barcode"
"golang.org/x/image/font"
"golang.org/x/image/font/basicfont"
"golang.org/x/image/math/fixed"
)
// WithSubtitle will add the content to the bottom of the image
func WithSubtitle(bc barcode.Barcode) image.Image {
fontFace := basicfont.Face7x13
fontColor := color.RGBA{0, 0, 0, 255}
margin := 5 // Space between barcode and text
// Get the bounds of the string
bounds, _ := font.BoundString(fontFace, bc.Content())
widthTxt := int((bounds.Max.X - bounds.Min.X) / 64)
heightTxt := int((bounds.Max.Y - bounds.Min.Y) / 64)
// calc width and height
width := widthTxt
if bc.Bounds().Dx() > width {
width = bc.Bounds().Dx()
}
height := heightTxt + bc.Bounds().Dy() + margin
// create result img
img := image.NewRGBA(image.Rect(0, 0, width, height))
// draw the barcode
draw.Draw(img, image.Rect(0, 0, bc.Bounds().Dx(), bc.Bounds().Dy()), bc, bc.Bounds().Min, draw.Over)
// TextPt
offsetY := bc.Bounds().Dy() + margin - int(bounds.Min.Y/64)
offsetX := (width - widthTxt) / 2
point := fixed.Point26_6{
X: fixed.Int26_6(offsetX * 64),
Y: fixed.Int26_6(offsetY * 64),
}
d := &font.Drawer{
Dst: img,
Src: image.NewUniform(fontColor),
Face: fontFace,
Dot: point,
}
d.DrawString(bc.Content())
return img
}