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()
}
func main() {
// load a PNG specified on the command line (16x16 recommended).
if len(os.Args) < 2 {
log.Fatal("specify a png image to load.")
}
tx, err := texture.Load(os.Args[1])
if err != nil {
log.Fatal(err)
}
// create a new frame buffer
fb := screen.NewFrameBuffer()
// setup a channel to handle Ctrl-C events
quit := make(chan os.Signal, 1)
signal.Notify(quit, syscall.SIGUSR1, syscall.SIGINT, syscall.SIGTERM)
// scroll around the edges of the image.
var xo, yo, state int
loop:
for {
// this is to pause for 33 milliseconds (30fps)
// except during state changes, which will pause for half-a-second.
sleep := 33
switch state {
case 0: // nothing (initial state)
state = 1
sleep = 500
case 1: // down
yo++
if yo == tx.Height()-8 {
state = 2
sleep = 500
}
case 2: // right
xo++
if xo == tx.Width()-8 {
state = 3
sleep = 500
}
case 3: // up
yo--
if yo == 0 {
state = 4
sleep = 500
}
case 4: // left
xo--
if xo == 0 {
state = 1
sleep = 500
}
}
// Blit texture to the frame buffer.
texture.Blit(fb.Texture, 0, 0, tx, xo, yo, 8, 8)
// Draw frame buffer to the screen.
screen.Draw(fb)
// Check if Ctrl-C was pressed
// while waiting a few milliseconds.
timer := time.NewTimer(time.Millisecond * time.Duration(sleep))
select {
case <-quit:
timer.Stop()
break loop
case <-timer.C:
}
}
screen.Clear()
}
