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oled.go
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oled.go
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package main
import (
"image"
"image/draw"
"image/gif"
"image/jpeg"
"log"
"os"
"strings"
"time"
"github.com/golang/freetype/truetype"
"github.com/nfnt/resize"
"golang.org/x/image/font"
"golang.org/x/image/font/gofont/goregular"
"golang.org/x/image/math/fixed"
"periph.io/x/conn/v3/i2c"
"periph.io/x/conn/v3/i2c/i2creg"
"periph.io/x/devices/v3/ssd1306"
"periph.io/x/host/v3"
)
type OledDevice struct {
DeviceHandle ssd1306.Dev
I2CBus i2c.BusCloser
ImageData []*image.Gray
GifData *gif.GIF
}
func (dev *OledDevice) InitDefault() {
dev.Init(128, 32, true, true, false)
}
func (dev *OledDevice) Init(w int, h int, rotated bool, sequential bool, swapTopBottom bool) {
// Load all the drivers
_, err := host.Init()
if err != nil {
panic(err)
}
// Open a handle to the first available I²C bus
bus, err := i2creg.Open("")
if err != nil {
panic(err)
}
oledOpts := ssd1306.Opts{
W: w,
H: h,
Rotated: rotated,
Sequential: sequential,
SwapTopBottom: swapTopBottom,
}
// Open a handle to a ssd1306 connected on the I²C bus
oledDev, err := ssd1306.NewI2C(bus, &oledOpts)
if err != nil {
log.Fatal(err)
}
dev.DeviceHandle = *oledDev
dev.I2CBus = bus
}
func (dev *OledDevice) Close() {
dev.DeviceHandle.Halt()
dev.I2CBus.Close()
}
func (dev *OledDevice) setupGif(gifPath string) {
// Open the gif file
f, err := os.Open(gifPath)
if err != nil {
panic(err)
}
defer f.Close()
// Read the gif file
g, err := gif.DecodeAll(f)
if err != nil {
panic(err)
}
imgs := make([]*image.Gray, len(g.Image))
for i := range g.Image {
imgs[i] = convertAndResizeAndCenter(dev.DeviceHandle.Bounds().Dx(), dev.DeviceHandle.Bounds().Dy(), g.Image[i])
}
dev.ImageData = imgs
dev.GifData = g
}
func (dev *OledDevice) DisplayGif(gifPath string) {
dev.setupGif(gifPath)
for i := 0; ; i++ {
index := i % len(dev.ImageData)
c := time.After(time.Duration(10*dev.GifData.Delay[index]) * time.Millisecond)
img := dev.ImageData[index]
dev.DeviceHandle.Draw(img.Bounds(), img, image.Point{})
<-c
}
}
func (dev *OledDevice) DisplayText(str string) {
img := generateTextImage(dev.DeviceHandle.Bounds().Dx(), dev.DeviceHandle.Bounds().Dy(), str)
output, err := os.Create("txt_display.jpg")
if err != nil {
panic(err)
}
defer output.Close()
err = jpeg.Encode(output, img, nil)
if err != nil {
panic(err)
}
err = dev.DeviceHandle.Draw(image.Rect(0, 0, dev.DeviceHandle.Bounds().Dx(), dev.DeviceHandle.Bounds().Dy()), img, image.Point{})
if err != nil {
panic(err)
}
}
// convertAndResizeAndCenter takes an image, resizes and centers it on a
// image.Gray of size w*h.
func convertAndResizeAndCenter(w, h int, src image.Image) *image.Gray {
src = resize.Thumbnail(uint(w), uint(h), src, resize.Bicubic)
img := image.NewGray(image.Rect(0, 0, w, h))
r := src.Bounds()
r = r.Add(image.Point{(w - r.Max.X) / 2, (h - r.Max.Y) / 2})
draw.Draw(img, r, src, image.Point{}, draw.Src)
return img
}
func generateTextImage(w int, h int, str string) *image.RGBA {
img := image.NewRGBA(image.Rect(0, 0, w, h))
goRegFont, err := truetype.Parse(goregular.TTF)
if err != nil {
panic(err)
}
opts := truetype.Options{}
opts.Size = 13
face := truetype.NewFace(goRegFont, &opts)
lines := strings.Split(str, "\n")
lineTxtHeight := (face.Metrics().Ascent.Ceil() + face.Metrics().Descent.Ceil())
totalTxtHeight := lineTxtHeight * len(lines)
startY := (h-totalTxtHeight)/2 + lineTxtHeight
for _, line := range lines {
txtWidth := font.MeasureString(face, line).Ceil()
startX := (w - txtWidth) / 2
drawer := font.Drawer{
Dst: img,
Src: image.White,
Face: face,
Dot: fixed.P(startX, startY),
}
drawer.DrawString(line)
startY += lineTxtHeight
}
return img
}