func main() {
// create a new frame buffer
fb := screen.NewFrameBuffer()
// turn on LEDs on the first row
fb.SetPixel(0, 0, color.Red)
fb.SetPixel(1, 0, color.Green)
fb.SetPixel(2, 0, color.Blue)
fb.SetPixel(3, 0, color.New(255, 0, 255)) // Magenta
fb.SetPixel(4, 0, color.New(255, 255, 0)) // Yellow
fb.SetPixel(5, 0, color.New(0, 255, 255)) // Cyan
fb.SetPixel(6, 0, color.White)
// draw gradients
var c uint8
for x := 0; x < 8; x++ {
c = uint8((x+1)*32 - 1)
fb.SetPixel(x, 1, color.New(c, c, c))
fb.SetPixel(x, 2, color.New(c, 0, 0))
fb.SetPixel(x, 3, color.New(0, c, 0))
fb.SetPixel(x, 4, color.New(0, 0, c))
fb.SetPixel(x, 5, color.New(c, 0, c))
fb.SetPixel(x, 6, color.New(c, c, 0))
fb.SetPixel(x, 7, color.New(0, c, c))
}
// draw the frame buffer to the screen
screen.Draw(fb)
// wait for Ctrl-C, then clear the screen
quit := make(chan os.Signal, 1)
signal.Notify(quit, syscall.SIGUSR1, syscall.SIGINT, syscall.SIGTERM)
<-quit
screen.Clear()
}
// Load a texture from a PNG.
func Load(name string) (*Texture, error) {
f, err := os.Open(name)
if err != nil {
return nil, err
}
defer f.Close()
img, _, err := image.Decode(f)
if err != nil {
return nil, err
}
b := img.Bounds().Size()
tx := New(b.X, b.Y)
for y := 0; y < b.Y; y++ {
for x := 0; x < b.X; x++ {
r, g, b, _ := img.At(x, y).RGBA()
tx.Pixels[y*tx.width+x] = color.New(uint8(r>>8), uint8(g>>8), uint8(b>>8))
}
}
return tx, nil
}