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package main
import (
"embed"
"image"
"image/color"
"image/draw"
_ "image/png"
"io"
"io/fs"
"os"
"golang.org/x/image/font"
"golang.org/x/image/font/opentype"
"golang.org/x/image/font/sfnt"
"golang.org/x/image/math/fixed"
)
// openSFNT opens the specified font file
// It keeps the file open indefinitely for lazy loading when the font is used.
// It never attempts to close the file and is meant only for loading fonts permanently at init time.
func openSFNT(fs fs.FS, path string) *sfnt.Font {
f, err := fs.Open(path)
if err != nil {
panic(err)
}
font, err := sfnt.ParseReaderAt(f.(io.ReaderAt))
if err != nil {
panic(err)
}
return font
}
func openImage(fs fs.FS, path string) image.Image {
f, err := fs.Open(path)
if err != nil {
panic(err)
}
img, _, err := image.Decode(f)
if err != nil {
panic(err)
}
return img
}
//go:embed *.ttf *.png
var embedFS embed.FS
var qtFonts = os.DirFS("/usr/lib/fonts")
var (
dejaVuSans = openSFNT(qtFonts, "DejaVuSans.ttf")
notoSans_Regular = openSFNT(embedFS, "NotoSans-Regular.ttf")
notoSans_Bold = openSFNT(embedFS, "NotoSans-Bold.ttf")
)
var (
orcaImg = openImage(embedFS, "orca.png")
belowImg = openImage(embedFS, "below.png")
)
type justify int
const (
_ justify = iota
justifyLeft
justifyCenter
justifyRight
)
func drawText(img draw.Image, sfnt *sfnt.Font, size float64, just justify, c color.Color, dot fixed.Point26_6, text string) {
face, err := opentype.NewFace(sfnt, &opentype.FaceOptions{
Size: size,
DPI: 72,
Hinting: font.HintingNone,
})
if err != nil {
panic(err)
}
defer face.Close()
drawer := font.Drawer{
Dst: img,
Src: &image.Uniform{c},
Face: face,
Dot: dot,
}
_, adv := drawer.BoundString(text)
var offset fixed.Int26_6
switch just {
case justifyCenter:
offset = adv / 2
case justifyRight:
offset = adv
}
drawer.Dot.X -= offset
drawer.DrawString(text)
}
func drawDisplay(img draw.Image, s displayState) {
draw.Draw(img, img.Bounds(), &image.Uniform{color.RGBA{34, 31, 32, 255}}, image.Point{}, draw.Src)
drawText(img, dejaVuSans, 20, justifyLeft, color.White, fixed.P(50, 25), s.now.Format("Jan 02, 2006"))
drawText(img, dejaVuSans, 20, justifyRight, color.White, fixed.P(750, 25), s.now.Format("3:04 pm"))
drawText(img, notoSans_Regular, 16, justifyCenter, color.White, fixed.P(400, 25), "V1234567-D98765")
draw.Draw(img, orcaImg.Bounds().Add(image.Point{400 - orcaImg.Bounds().Dx()/2, 75}), orcaImg, image.Point{}, draw.Over)
if s.cvend.ready {
if !s.cvend.hasCard {
drawText(img, notoSans_Bold, 48, justifyCenter, color.White, fixed.P(400, 330), "Tap below")
}
draw.Draw(img, belowImg.Bounds().Add(image.Point{400 - belowImg.Bounds().Dx()/2, 380}), belowImg, image.Point{}, draw.Over)
}
}
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