package org.jgroups.demos.applets;
import java.applet.Applet;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.io.*;
import java.util.*;
import java.util.List;
import org.jgroups.*;
import org.jgroups.logging.Log;
import org.jgroups.logging.LogFactory;
import org.jgroups.util.Util;
public class DrawApplet extends Applet implements MouseMotionListener, ActionListener {
private Graphics graphics=null;
private Panel panel=null, sub_panel=null;
private final ByteArrayOutputStream out=new ByteArrayOutputStream();
private DataOutputStream outstream;
private DataInputStream instream;
private final Random random=new Random(System.currentTimeMillis());
private Button clear_button, leave_button;
private Label mbr_label;
private final Font default_font=new Font("Helvetica", Font.PLAIN, 12);
private static final String groupname="DrawGroup";
private Channel channel=null;
private int member_size=1;
private int red=0, green=0, blue=0;
private Color default_color=null;
private String props="tunnel.xml";
private final List<Address> members=new ArrayList<Address>();
private boolean fl=true;
Log log=LogFactory.getLog(getClass());
public void init() {
System.out.println("INIT");
setLayout(new BorderLayout());
String tmp_props=getParameter("properties");
if(tmp_props != null) {
System.out.println("Setting parameters " + tmp_props);
props=tmp_props;
}
try {
channel=new JChannel(props);
channel.setReceiver(new ReceiverAdapter() {
public void viewAccepted(View v) {
List<Address> mbrs=v.getMembers();
System.out.println("View accepted: " + v);
member_size=v.size();
if(mbr_label != null)
mbr_label.setText(member_size + " mbr(s)");
members.clear();
members.addAll(mbrs);
}
public void receive(Message msg) {
if(msg == null || msg.getLength() == 0) {
log.error("DrawApplet.run(): msg or msg.buffer is null !");
return;
}
instream=new DataInputStream(new ByteArrayInputStream(msg.getRawBuffer(), msg.getOffset(), msg.getLength()));
int r=0;
try {
r=instream.readInt();
if(r == -13) {
clearPanel();
return;
}
int g=instream.readInt();
int b=instream.readInt();
int my_x=instream.readInt();
int my_y=instream.readInt();
if(graphics != null) {
graphics.setColor(new Color(r, g, b));
graphics.fillOval(my_x, my_y, 10, 10);
graphics.setColor(default_color);
}
}
catch(Exception ex) {
ex.printStackTrace();
}
}
});
showStatus("Connecting to group " + groupname);
channel.connect(groupname);
}
catch(Exception e) {
e.printStackTrace();
}
go();
}
public void start() {
System.out.println("------- START");
}
public void destroy() {
System.out.println("------- DESTROY");
showStatus("Disconnecting from " + groupname);
channel.close();
showStatus("Disconnected");
}
public void paint(Graphics g) {
Rectangle bounds=panel.getBounds();
Color old=graphics.getColor();
if(bounds == null || graphics == null)
return;
graphics.setColor(Color.black);
graphics.drawRect(0, 0, bounds.width - 1, bounds.height - 1);
graphics.setColor(old);
}
private void selectColor() {
red=Math.abs(random.nextInt()) % 255;
green=Math.abs(random.nextInt()) % 255;
blue=Math.abs(random.nextInt()) % 255;
default_color=new Color(red, green, blue);
}
public void go() {
try {
panel=new Panel();
sub_panel=new Panel();
resize(200, 200);
add("Center", panel);
clear_button=new Button("Clear");
clear_button.setFont(default_font);
clear_button.addActionListener(this);
leave_button=new Button("Exit");
leave_button.setFont(default_font);
leave_button.addActionListener(this);
mbr_label=new Label("0 mbr(s)");
mbr_label.setFont(default_font);
sub_panel.add("South", clear_button);
sub_panel.add("South", leave_button);
sub_panel.add("South", mbr_label);
add("South", sub_panel);
panel.addMouseMotionListener(this);
setVisible(true);
mbr_label.setText(member_size + " mbrs");
graphics=panel.getGraphics();
selectColor();
graphics.setColor(default_color);
panel.setBackground(Color.white);
clear_button.setForeground(Color.blue);
leave_button.setForeground(Color.blue);
}
catch(Exception e) {
log.error(e.toString());
}
}
/* --------------- Callbacks --------------- */
public void mouseMoved(MouseEvent e) {
}
public void mouseDragged(MouseEvent e) {
int tmp[]=new int[1], x, y;
tmp[0]=0;
x=e.getX();
y=e.getY();
graphics.fillOval(x, y, 10, 10);
try {
out.reset();
outstream=new DataOutputStream(out);
outstream.writeInt(red);
outstream.writeInt(green);
outstream.writeInt(blue);
outstream.writeInt(x);
outstream.writeInt(y);
channel.send(new Message(null, null, out.toByteArray()));
out.reset();
}
catch(Exception ex) {
log.error(ex.toString());
}
}
public void clearPanel() {
Rectangle bounds=null;
if(panel == null || graphics == null)
return;
bounds=panel.getBounds();
graphics.clearRect(1, 1, bounds.width - 2, bounds.height - 2);
}
public void sendClearPanelMsg() {
int tmp[]=new int[1];
tmp[0]=0;
clearPanel();
try {
out.reset();
outstream=new DataOutputStream(out);
outstream.writeInt(-13);
channel.send(new Message(null, null, out.toByteArray()));
outstream.flush();
}
catch(Exception ex) {
log.error(ex.toString());
}
}
public void actionPerformed(ActionEvent e) {
String command=e.getActionCommand();
if(command == "Clear") {
System.out.println("Members are " + members);
sendClearPanelMsg();
}
else if(command == "Exit") {
try {
destroy();
setVisible(false);
}
catch(Exception ex) {
log.error(ex.toString());
}
}
else
System.out.println("Unknown action");
}
}