From ef2afaa98435e30dcc06f90dd6eeaa9b753ff0c7 Mon Sep 17 00:00:00 2001
From: Justin Hawkins <justin@hawkins.id.au>
Date: Tue, 28 Apr 2026 10:52:48 +0930
Subject: [PATCH] WIP

---
 main.go | 95 +++++++++++++++++++++++++++++++++++----------------------
 1 file changed, 59 insertions(+), 36 deletions(-)

diff --git a/main.go b/main.go
index 4b8cd14..7795bab 100644
--- a/main.go
+++ b/main.go
@@ -2,22 +2,29 @@ package main
 
 import (
 	"fmt"
-	"image/color"
+	"log/slog"
 
 	"codeberg.org/go-pdf/fpdf"
 	"github.com/yeqown/go-qrcode/v2"
 	"github.com/yeqown/go-qrcode/writer/standard"
 )
 
-// 1
-
 var cols = 4
-var rows = 5
-var qrSize = 40
-var fontSize = 20
+var rows = 4
+var qrSize = 50.0
+var fontSize = 16.0 // pts
+var fontSizeMM = fontSize / 72 * 25.4
+var text = "meow!"
+
+var textTopPadding = 5.0
+var qrTopPadding = 5.0
+
+// var probably some padding instead of offsets for qr/font placement
 
 func main() {
-	qrc, err := qrcode.New("https://nanocat.net")
+
+	qrc, err := qrcode.New("https://nanocat.net/dom/sdfih/dsifj/sidhof/sdifho/sdfiuoh/safiuho")
+
 	if err != nil {
 		fmt.Printf("could not generate QRCode: %v", err)
 		return
@@ -28,27 +35,27 @@ func main() {
 		// standard.WithQRWidth(uint8(qrSize)),
 		standard.WithBorderWidth(0),
 		standard.WithBuiltinImageEncoder(standard.PNG_FORMAT),
-		standard.WithCircleShape(),
-		standard.WithFgGradient(&standard.LinearGradient{
-			Stops: []standard.ColorStop{{
-				T: 0.0,
-				Color: color.RGBA{
-					R: 255,
-					G: 0,
-					B: 0,
-					A: 0,
-				},
-			}, {
-				T: 1.0,
-				Color: color.RGBA{
-					R: 0,
-					G: 255,
-					B: 0,
-					A: 0,
-				},
-			}},
-			Angle: 45,
-		}), standard.WithLogoImageFileJPEG("cat-pet-animal-domestic-104827.jpeg"),
+		// standard.WithCircleShape(),
+		// standard.WithFgGradient(&standard.LinearGradient{
+		// 	Stops: []standard.ColorStop{{
+		// 		T: 0.0,
+		// 		Color: color.RGBA{
+		// 			R: 255,
+		// 			G: 0,
+		// 			B: 0,
+		// 			A: 0,
+		// 		},
+		// 	}, {
+		// 		T: 1.0,
+		// 		Color: color.RGBA{
+		// 			R: 0,
+		// 			G: 255,
+		// 			B: 0,
+		// 			A: 0,
+		// 		},
+		// 	}},
+		// 	Angle: 45,
+		// }),
 	)
 
 	// save file
@@ -68,18 +75,35 @@ func main() {
 		AllowNegativePosition: false,
 	}, b)
 
-	info := pdf.GetImageInfo("qr")
+	// info := pdf.GetImageInfo("qr")
 	// panic(info.Height())
 
 	pdf.AddPage()
 	pdf.SetFont("Arial", "B", float64(fontSize))
 
-	text := "foobar"
 	textWidth := pdf.GetStringWidth(text)
 
 	colWidth := pageWidth / float64(cols)
 	rowHeight := pageHeight / float64(rows)
 
+	// qrRowRatio := qrSize / rowHeight
+	// qrColRatio := qrSize / colWidth
+
+	// fmt.Printf("qr/row height ratio: %.2f\n", qrRowRatio)
+	// fmt.Printf("qr/col width ratio: %.2f\n", qrColRatio)
+
+	if textTopPadding+fontSizeMM+qrTopPadding+qrSize > rowHeight {
+		slog.Warn("qr is too big for row")
+	}
+
+	if qrSize > colWidth {
+		slog.Warn("qr is too big for column")
+	}
+
+	if textWidth > colWidth {
+		slog.Warn("text probably too wide")
+	}
+
 	for rowIdx := range rows {
 		for colIdx := range cols {
 			topLeftX := colWidth * float64(colIdx)
@@ -95,16 +119,15 @@ func main() {
 			// label at the top
 			pdf.Text(
 				topLeftX+colWidth/2-textWidth/2,
-				topLeftY+float64(fontSize),
+				topLeftY+textTopPadding+fontSizeMM,
 				text, // +fmt.Sprintf("%d/%d", rowIdx, colIdx)
 			)
 
-			info.Height()
-			// pdf at the bottom
+			// qr at the bottom
 			pdf.ImageOptions("qr",
-				topLeftX+info.Width()-float64(qrSize), //+float64(dim)/2,        // centre
-				topLeftY+float64(fontSize)*1.3,        // centre
-				float64(qrSize), float64(qrSize),
+				topLeftX+colWidth/2-qrSize/2,                    //+float64(dim)/2,        // centre
+				topLeftY+textTopPadding+fontSizeMM+qrTopPadding, // centre, below text line
+				qrSize, qrSize,
 				false,
 				fpdf.ImageOptions{AllowNegativePosition: true}, 0, "")
 			// pdf.Image("qr",