LinesFrameImpl.java

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// file LinesFrameImpl.java  by pmateti@wright.edu

package WhiteBoard;

import java.io.*;
import java.util.*;
import java.awt.*;
import java.awt.event.*;
import java.rmi.*;


public class LinesFrameImpl
    extends java.rmi.server.UnicastRemoteObject
    implements LinesFrame
{
    private int x0 = 0, y0 = 0, x1, y1;
    private static final int WIDTH = 300, HEIGHT = 300;
    private Frame frame;
    private WbClient myWbClient;
    private String myURL, myCLientURL;

    private void deleteAndExit() {
    try { 
        myWbClient.pleaseDie(); 
        Naming.unbind(myURL);
    } catch (Exception e) {e.printStackTrace();}
    System.exit(0);     
    }              

    WindowListener destroyWindow = new WindowAdapter() {
        public void windowClosing(WindowEvent w) {
        deleteAndExit();
        }
    };

    WindowListener raisedWindow = new WindowAdapter() {
        public void windowActivated(WindowEvent w) { 
        try { myWbClient.sendAllLines(); }
        catch (Exception e) {e.printStackTrace();}
        }
    };
    
    MouseListener getCoords = new MouseAdapter() {
        public void mouseClicked(MouseEvent m) {
        if (m.getModifiers() == InputEvent.BUTTON3_MASK)
            deleteAndExit(); 

        try {
            // get the coords, and send a line to our client
            LineCoords ln = new LineCoords();
            ln.x2 = m.getX();
            ln.y2 = m.getY();
            ln.x1 = x0;
            ln.y1 = y0;
            x0 = ln.x2; // store current point
            y0 = ln.y2;
            myWbClient.sendLine(ln);
        } catch (Exception e) {e.printStackTrace();}
        }
    };

    public LinesFrameImpl(String [] args) throws Exception {
    // args = [myId, bnm, displayMcnm, clientMcnm, clientId]
    super();

    myCLientURL = Invoke.makeURL('C', args[4]);

    frame = new Frame(args[1] + "@" + myCLientURL + "@" + args[3]);
    frame.setSize(WIDTH, HEIGHT);
    frame.setVisible(true);
    frame.addWindowListener(destroyWindow);
    frame.addWindowListener(raisedWindow);
    frame.addMouseListener(getCoords);  

    myURL = Invoke.makeURL('D', args[4]);
    myWbClient = (WbClient) Invoke.lookup(myCLientURL);
    myWbClient.recvDisplayObj(this);
    Invoke.myPrint("LinesFrameImpl", myURL);
    Invoke.myPrint("LinesFrameImpl", ""+myWbClient);
    Invoke.myPrint("LinesFrameImpl", "Done");
    }
    
    public void recvOneLine(LineCoords ln) {
    Graphics g = frame.getGraphics();
    g.setColor(ln.c);
    g.drawLine(ln.x1, ln.y1, ln.x2, ln.y2);
    }

    public static void main(String[] args) {
    try {   LinesFrameImpl f = new LinesFrameImpl(args); }
    catch (Exception e) {e.printStackTrace();}
    }
}

// -eof-