Use lightningvolt.ttf for coordinates

chess/board.go

@@ -12,6 +12,7 @@ import (
 
 	"golang.org/x/image/font"
 	"golang.org/x/image/font/basicfont"
+	"golang.org/x/image/font/opentype"
 	"golang.org/x/image/math/fixed"
 )
 
@@ -197,11 +198,17 @@ func drawCoordinate(img *image.RGBA, x, y int, flipped bool) {
 		} else if !flipped {
 			color = Light
 		}
-		// TODO: use SN font and make it bold
+
+		face, err := loadFontFace("lightningvolt.ttf")
+		if err != nil {
+			log.Printf("error loading font: %v\n", err)
+			face = basicfont.Face7x13
+		}
+
 		d := &font.Drawer{
 			Dst:  img,
 			Src:  image.NewUniform(color),
-			Face: basicfont.Face7x13,
+			Face: face,
 			Dot:  origin,
 		}
 		d.DrawString(s)
@@ -214,11 +221,36 @@ func drawCoordinate(img *image.RGBA, x, y int, flipped bool) {
 	}
 
 	if row != "" {
-		origin = fixed.P((x+1)*128-12, y*128+15)
+		origin = fixed.P((x+1)*128-20, y*128+23)
 		drawString(row, origin)
 	}
 }
 
+func loadFontFace(path string) (font.Face, error) {
+	fontBytes, err := os.ReadFile(path)
+	if err != nil {
+		return nil, err
+	}
+
+	ttfFont, err := opentype.Parse(fontBytes)
+	if err != nil {
+		return nil, err
+	}
+
+	faceOptions := &opentype.FaceOptions{
+		Size:    32,
+		DPI:     72,
+		Hinting: font.HintingNone,
+	}
+
+	fontFace, err := opentype.NewFace(ttfFont, faceOptions)
+	if err != nil {
+		return nil, err
+	}
+
+	return fontFace, nil
+}
+
 func (b *Board) SetPiece(name PieceName, color Color, position string) error {
 	var (
 		piece *Piece

go.mod

@@ -12,6 +12,7 @@ require (
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
+	golang.org/x/text v0.18.0 // indirect
 	gopkg.in/guregu/null.v4 v4.0.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -10,6 +10,8 @@ github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsT
 github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
 golang.org/x/image v0.20.0 h1:7cVCUjQwfL18gyBJOmYvptfSHS8Fb3YUDtfLIZ7Nbpw=
 golang.org/x/image v0.20.0/go.mod h1:0a88To4CYVBAHp5FXJm8o7QbUl37Vd85ply1vyD8auM=
+golang.org/x/text v0.18.0 h1:XvMDiNzPAl0jr17s6W9lcaIhGUfUORdGCNsuLmPG224=
+golang.org/x/text v0.18.0/go.mod h1:BuEKDfySbSR4drPmRPG/7iBdf8hvFMuRexcpahXilzY=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/guregu/null.v4 v4.0.0 h1:1Wm3S1WEA2I26Kq+6vcW+w0gcDo44YKYD7YIEJNHDjg=