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