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SVG: use a single path element instead of many rects

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This avoids small gaps between QR code squares.

I learnt about this approach from
https://github.com/papnkukn/qrcode-svg
This commit is contained in:
Michael Stapelberg
2020-11-22 17:13:22 +01:00
parent 31bda30724
commit 950f332cca
1 changed files with 5 additions and 1 deletions
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6
qrcodegeneratorsvg.go
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@@ -16,6 +16,7 @@ package qrbill
import ( import (
"bytes" "bytes"
"fmt"
svg "github.com/ajstarks/svgo" svg "github.com/ajstarks/svgo"
"github.com/makiuchi-d/gozxing" "github.com/makiuchi-d/gozxing"
@@ -60,14 +61,17 @@ func renderResultSVG(code *encoder.QRCode, width, height, quietZone int) ([]byte
s.Group(`shape-rendering="crispEdges"`) s.Group(`shape-rendering="crispEdges"`)
pathdata := ""
for inputY, outputY := 0, topPadding; inputY < inputHeight; inputY, outputY = inputY+1, outputY+multiple { for inputY, outputY := 0, topPadding; inputY < inputHeight; inputY, outputY = inputY+1, outputY+multiple {
// Write the contents of this row of the barcode // Write the contents of this row of the barcode
for inputX, outputX := 0, leftPadding; inputX < inputWidth; inputX, outputX = inputX+1, outputX+multiple { for inputX, outputX := 0, leftPadding; inputX < inputWidth; inputX, outputX = inputX+1, outputX+multiple {
if input.Get(inputX, inputY) == 1 { if input.Get(inputX, inputY) == 1 {
s.Rect(outputX, outputY, multiple, multiple, "fill:black;stroke:none;") pathdata += fmt.Sprintf("M%d,%d V%d H%d V%d H%d Z ",
outputX, outputY, outputY+multiple, outputX+multiple, outputY, outputX)
} }
} }
} }
s.Path(pathdata, "fill:black;stroke:none;")
s.Gend() s.Gend()