108 lines
2.7 KiB
Go
108 lines
2.7 KiB
Go
package label
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import (
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"image"
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"image/draw"
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"strings"
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"janouch.name/sklad/bdf"
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"janouch.name/sklad/imgutil"
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"github.com/boombuler/barcode"
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"github.com/boombuler/barcode/qr"
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)
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// TODO: Rename to GenQRLabelForHeight.
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func GenLabelForHeight(font *bdf.Font,
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text string, height, scale int) image.Image {
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// Create a scaled bitmap of the text label.
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textRect, _ := font.BoundString(text)
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textImg := image.NewRGBA(textRect)
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draw.Draw(textImg, textRect, image.White, image.ZP, draw.Src)
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font.DrawString(textImg, image.ZP, text)
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scaledTextImg := imgutil.Scale{Image: textImg, Scale: scale}
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scaledTextRect := scaledTextImg.Bounds()
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remains := height - scaledTextRect.Dy() - 20
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width := scaledTextRect.Dx()
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if remains > width {
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width = remains
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}
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// Create a scaled bitmap of the QR code.
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qrImg, _ := qr.Encode(text, qr.H, qr.Auto)
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qrImg, _ = barcode.Scale(qrImg, remains, remains)
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qrRect := qrImg.Bounds()
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// Combine.
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combinedRect := image.Rect(0, 0, width, height)
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combinedImg := image.NewRGBA(combinedRect)
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draw.Draw(combinedImg, combinedRect, image.White, image.ZP, draw.Src)
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draw.Draw(combinedImg,
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combinedRect.Add(image.Point{X: (width - qrRect.Dx()) / 2, Y: 0}),
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qrImg, image.ZP, draw.Src)
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target := image.Rect(
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(width-scaledTextRect.Dx())/2, qrRect.Dy()+20,
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combinedRect.Max.X, combinedRect.Max.Y)
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draw.Draw(combinedImg, target, &scaledTextImg, scaledTextRect.Min, draw.Src)
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return combinedImg
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}
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func max(a, b int) int {
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if a > b {
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return a
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}
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return b
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}
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func GenLabelForWidth(font *bdf.Font,
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text string, width, scale int) image.Image {
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var lines []string
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for _, line := range strings.Split(text, "\n") {
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lines = append(lines, strings.TrimSuffix(line, "\r"))
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}
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// Respect font ascent and descent so that there are gaps between lines.
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rects := make([]image.Rectangle, len(lines))
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jumps := make([]int, len(lines))
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for i, line := range lines {
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r, _ := font.BoundString(line)
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rects[i] = r
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if i > 0 {
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deficitD := font.Descent - rects[i-1].Max.Y
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jumps[i] += max(0, deficitD)
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deficitA := font.Ascent - (-r.Min.Y)
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jumps[i] += max(0, deficitA)
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}
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}
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height := 0
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for i := range lines {
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height += jumps[i] + rects[i].Dy()
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}
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imgRect := image.Rect(0, 0, width, height*scale)
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img := image.NewRGBA(imgRect)
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draw.Draw(img, imgRect, image.White, image.ZP, draw.Src)
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y := 0
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for i, line := range lines {
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textImg := image.NewRGBA(rects[i])
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draw.Draw(textImg, rects[i], image.White, image.ZP, draw.Src)
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font.DrawString(textImg, image.ZP, line)
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scaledImg := imgutil.Scale{Image: textImg, Scale: scale}
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scaledRect := scaledImg.Bounds()
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y += jumps[i]
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target := image.Rect(0, y*scale, imgRect.Max.X, imgRect.Max.Y)
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draw.Draw(img, target, &scaledImg, scaledRect.Min, draw.Src)
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y += rects[i].Dy()
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}
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return img
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}
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