image-noise-1.go

package main

import (
	"code.google.com/p/x-go-binding/ui/x11"
	"fmt"
	"image"
	"image/color"
	"image/draw"
	"log"
	"os"
	"time"
)

var randcol = genrandcol()

func genrandcol() <-chan color.Color {
	c := make(chan color.Color)

	go func() {
		for {
			select {
			case c <- image.Black:
			case c <- image.White:
			}
		}
	}()

	return c
}

func gennoise(screen draw.Image) {
	for y := 0; y < 240; y++ {
		for x := 0; x < 320; x++ {
			screen.Set(x, y, <-randcol)
		}
	}
}

func fps() chan<- bool {
	up := make(chan bool)

	go func() {
		var frames int64
		var lasttime time.Time
		var totaltime time.Duration

		for {
			<-up
			frames++
			now := time.Now()
			totaltime += now.Sub(lasttime)
			if totaltime > time.Second {
				fmt.Printf("FPS: %v\n", float64(frames)/totaltime.Seconds())
				frames = 0
				totaltime = 0
			}
			lasttime = now
		}
	}()

	return up
}

func main() {
	win, err := x11.NewWindow()
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	defer win.Close()

	go func() {
		upfps := fps()
		screen := win.Screen()

		for {
			gennoise(screen)

			win.FlushImage()

			upfps <- true
		}
	}()

	for range win.EventChan() {
	}
}

//\Image-noise\image-noise-1.go