Task: Image noise




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() {
    }
}


Java: import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.util.Arrays;
import java.util.Random;
import javax.swing.*;

public class ImageNoise {
    int framecount = 0;
    int fps = 0;
    BufferedImage image;
    Kernel kernel;
    ConvolveOp cop;
    JFrame frame = new JFrame("Java Image Noise");

    JPanel panel = new JPanel() {
        private int show_fps = 0; 
        private MouseAdapter ma = new MouseAdapter() {
            @Override
            public void mouseClicked(MouseEvent e) {
                show_fps = (show_fps + 1) % 3;
            }
        };
        {addMouseListener(ma);}

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(320, 240);
        }

        @Override
        @SuppressWarnings("fallthrough")
        public void paintComponent(Graphics g1) {
            Graphics2D g = (Graphics2D) g1;
            drawNoise();
            g.drawImage(image, 0, 0, null);

            switch (show_fps) {
            case 0: 
                
                int xblur = getWidth() - 130, yblur = getHeight() - 32;
                BufferedImage bc = image.getSubimage(xblur, yblur, 115, 32);
                BufferedImage bs = new BufferedImage(bc.getWidth(), bc.getHeight(),
                                                     BufferedImage.TYPE_BYTE_GRAY);
                cop.filter(bc, bs);
                g.drawImage(bs, xblur, yblur , null);
            case 1: 
                
                g.setColor(Color.RED);
                g.setFont(new Font("Monospaced", Font.BOLD, 20));
                g.drawString("FPS: " + fps, getWidth() - 120, getHeight() - 10);
            }
            framecount++;
        }
    };
    
    
    Timer repainter = new Timer(1, new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            panel.repaint();
        }
    });
    
    
    Timer framerateChecker = new Timer(1000, new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            fps = framecount;
            framecount = 0;
        }
    });
    
    public ImageNoise() {
        
        float[] vals = new float[121];
        Arrays.fill(vals, 1/121f);
        kernel = new Kernel(11, 11, vals);
        cop = new ConvolveOp(kernel, ConvolveOp.EDGE_NO_OP, null);
        
        
        frame.add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
        repainter.start();
        framerateChecker.start();
    }

    void drawNoise() {
        int w = panel.getWidth(), h = panel.getHeight();
        
        
        if (null == image || image.getWidth() != w || image.getHeight() != h) {
            image = new BufferedImage(w, h, BufferedImage.TYPE_BYTE_GRAY);
        }
        Random rand = new Random();
        int[] data = new int[w * h];
        
        for (int x = 0; x < w * h / 32; x++) {
            int r = rand.nextInt();
            for (int i = 0; i < 32; i++) {
                data[x * 32 + i] = (r & 1) * Integer.MAX_VALUE;
                r >>>= 1;
            }
        }
        
        image.getRaster().setPixels(0, 0, w, h, data);
    }
    
    public static void main(String[] args) {
        
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                ImageNoise i = new ImageNoise();
            }
        });
    }
}