Clock

[Jack Bolton]

Hi,
I want to do a program with .html and .jsp that has two clocks in it:



1.One classic . And 2. One that would be digital, for example: 3:07. And that the user could edit the hour in the cloks.

what jsp/java classes or other technologies can i use to do this?

thanks for any response...
[ April 16, 2007: Message edited by: Jack Bolton ]

[Bear Bibeault]

Unless you are thinking of an applet, I don't see much in the way of JSP or Java in this. It's much more in the domain of DHTML.

So which way do you want to go? Applet or DHTML?

[Jack Bolton]

Applet

[Ben Souther]

Have you tried searching Google?
It looks like there are quite a few clock applets already out there:
http://www.google.com/search?hl=en&q=clock+applet&btnG=Google+Search\


This one looks pretty cool:
http://www.xanasoft.com/ajclock/

[Jack Bolton]

i am using j2sdk1.4.2_11 to run these example:

http://www.raingod.com/raingod/resources/Programming/Java/Software/Clocks/AnalogClock.html

I downloaded the source code in zip:

http://www.raingod.com/raingod/resources/Programming/Java/Software/Clocks/downloads/ClockApplet.zip

and the extended applet:
http://www.raingod.com/raingod/resources/Programming/Java/Software/SharedSource/shared10/ExtendedApplet.java

and i am compiling the ExtendedApplet.java, then i run it, and sends this error:
Exception in thread "main" java.lang.NoSuchMethodError: main

am I doing everithing ok?
what can i do to solve this?

[Ulf Dittmer]

and i am compiling the ExtendedApplet.java, then i run it, and sends this error:
Exception in thread "main" java.lang.NoSuchMethodError: main

How are you running it? Applets are not applications that you can run from the command line - they don't have a "main" method. You need to open an HTML file that contains an applet tag for this particular applet in your web browser.

[Jack Bolton]

i need some help with this program.

I was asked to do two clocks and that the user could edit the hours, as I said in the first post.
But I was told too, that i cannot use applet.


So:
To do such a program that I could not use applet nor dhtml.
How should I do it?

[Ulf Dittmer]

is this an assignment of some sort, designed to make your life harder than necessary?

Well, what technologies can you use then? A standalone Java application? Flash?

[Jack Bolton]

but if it would be a A standalone Java application.

How would I draw the clock?

[Ulf Dittmer]

Umm ... the same way you would do it in an applet. Are you familiar with the AWT and/or Swing drawing toolkits?

[Jack Bolton]

this is my program:
I put it all here, so you can run it, and see what happens
I converted it to a standalone Java application.
the program runs, and gives the time, but it stays there, it doesn't update.

What can I do so it updates?


Clock2.java

import java.util.*;
import java.awt.*;
//import java.applet.*;
import java.text.*;
 
 
public class Clock2 extends Panel implements Runnable {///
    Thread timer;                // The thread that displays clock
    int lastxs, lastys, lastxm,
        lastym, lastxh, lastyh;  // Dimensions used to draw hands 
    SimpleDateFormat formatter;  // Formats the date displayed
    String lastdate;             // String to hold date displayed
    Font clockFaceFont;          // Font for number display on clock
    Date currentDate;            // Used to get date to display
    Color handColor;             // Color of main hands and dial
    Color numberColor;           // Color of second hand and numbers
 
 
    
 
public static void main(String[] args) throws Exception{
  Frame f = new Frame();
  f.addWindowListener(new java.awt.event.WindowAdapter() {
       public void windowClosing(java.awt.event.WindowEvent e) {
       System.exit(0);
       };
     });
 
  Clock2 ut = new Clock2();
  ut.setSize(300,300); // same size as defined in the HTML APPLET
  f.add(ut);
  f.pack();
  ut.init();
  f.setSize(200,200 + 20); // add 20, seems enough for the Frame title,
  f.show();
  
  
  
  }
 
 
 
 
 
    public void init() {
    
    
    
    
    
   
    
    
        int x,y;
        lastxs = lastys = lastxm = lastym = lastxh = lastyh = 0;
        formatter = new SimpleDateFormat ("EEE MMM dd hh:mm:ss yyyy", Locale.getDefault());
 
        
        
 
        
        
      currentDate = new Date();
         
      
      
        lastdate = formatter.format(currentDate);
        
        
        
       
        
        
        
        
        clockFaceFont = new Font("Serif", Font.PLAIN, 14);
        handColor = Color.blue;
        numberColor = Color.darkGray;
        
        
        
        
 
   /*     try {
            setBackground(new Color(Integer.parseInt(getParameter("bgcolor"),16)));
        } catch (Exception E) { }
        try {
            handColor = new Color(Integer.parseInt(getParameter("fgcolor1"),16));
        } catch (Exception E) { }
        try {
            numberColor = new Color(Integer.parseInt(getParameter("fgcolor2"),16));
        } catch (Exception E) { } */
        
        
        
  //      resize(300,300);    //cambiado no necesario          // Set clock window size
        
        
        
        
    }
 
 
 
 
 
 
 
 
 
 
    // Plotpoints allows calculation to only cover 45 degrees of the circle,
    // and then mirror
    public void plotpoints(int x0, int y0, int x, int y, Graphics g) {
        g.drawLine(x0+x,y0+y,x0+x,y0+y);
        g.drawLine(x0+y,y0+x,x0+y,y0+x);
        g.drawLine(x0+y,y0-x,x0+y,y0-x);
        g.drawLine(x0+x,y0-y,x0+x,y0-y);
        g.drawLine(x0-x,y0-y,x0-x,y0-y);
        g.drawLine(x0-y,y0-x,x0-y,y0-x);
        g.drawLine(x0-y,y0+x,x0-y,y0+x);
        g.drawLine(x0-x,y0+y,x0-x,y0+y);
    }
 
    // Circle is just Bresenham's algorithm for a scan converted circle
    public void circle(int x0, int y0, int r, Graphics g) {
        int x,y;
        float d;
        x=0;
        y=r;
        d=5/4-r;
        plotpoints(x0,y0,x,y,g);
 
        while (y>x){
            if (d<0) {
                d=d+2*x+3;
                x++;
            }
            else {
                d=d+2*(x-y)+5;
                x++;
                y--;
            }
            plotpoints(x0,y0,x,y,g);
        }
    }
 
    // Paint is the main part of the program
    public void paint(Graphics g) {
        int xh, yh, xm, ym, xs, ys, s = 0, m = 10, h = 10, xcenter, ycenter;
        String today;
 
        currentDate = new Date();
        SimpleDateFormat formatter = new SimpleDateFormat("s",Locale.getDefault());
        try {
            s = Integer.parseInt(formatter.format(currentDate));
        } catch (NumberFormatException n) {
            s = 0;
        }
        formatter.applyPattern("m");
        try {
            m = Integer.parseInt(formatter.format(currentDate));
        } catch (NumberFormatException n) {
            m = 10;
        }    
        formatter.applyPattern("h");
        try {
            h = Integer.parseInt(formatter.format(currentDate));
        } catch (NumberFormatException n) {
            h = 10;
        }
        
        
        
        
        
        
        
        
        
        formatter.applyPattern("HH:mm:ss");
  //      formatter.applyPattern("EEE MMM dd HH:mm:ss yyyy");
        today = formatter.format(currentDate);
        xcenter=80;
        ycenter=55;
    
    // a= s* pi/2 - pi/2 (to switch 0,0 from 3:00 to 12:00)
    // x = r(cos a) + xcenter, y = r(sin a) + ycenter
    
        xs = (int)(Math.cos(s * 3.14f/30 - 3.14f/2) * 45 + xcenter);
        ys = (int)(Math.sin(s * 3.14f/30 - 3.14f/2) * 45 + ycenter);
        xm = (int)(Math.cos(m * 3.14f/30 - 3.14f/2) * 40 + xcenter);
        ym = (int)(Math.sin(m * 3.14f/30 - 3.14f/2) * 40 + ycenter);
        xh = (int)(Math.cos((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 30 + xcenter);
        yh = (int)(Math.sin((h*30 + m/2) * 3.14f/180 - 3.14f/2) * 30 + ycenter);
    
    // Draw the circle and numbers
    
        g.setFont(clockFaceFont);
        g.setColor(handColor);
        circle(xcenter,ycenter,50,g);
        g.setColor(numberColor);
        g.drawString("9",xcenter-45,ycenter+3); 
        g.drawString("3",xcenter+40,ycenter+3);
        g.drawString("12",xcenter-5,ycenter-37);
        g.drawString("6",xcenter-3,ycenter+45);
 
    // Erase if necessary, and redraw
    
        g.setColor(getBackground());
        if (xs != lastxs || ys != lastys) {
            g.drawLine(xcenter, ycenter, lastxs, lastys);
            g.drawString(lastdate, 5, 125);
        }
        if (xm != lastxm || ym != lastym) {
            g.drawLine(xcenter, ycenter-1, lastxm, lastym);
            g.drawLine(xcenter-1, ycenter, lastxm, lastym); }
        if (xh != lastxh || yh != lastyh) {
            g.drawLine(xcenter, ycenter-1, lastxh, lastyh);
            g.drawLine(xcenter-1, ycenter, lastxh, lastyh); }
        g.setColor(numberColor);
        g.drawString("", 5, 125);
        g.drawString(today, 5, 125);    
        g.drawLine(xcenter, ycenter, xs, ys);
        g.setColor(handColor);
        g.drawLine(xcenter, ycenter-1, xm, ym);
        g.drawLine(xcenter-1, ycenter, xm, ym);
        g.drawLine(xcenter, ycenter-1, xh, yh);
        g.drawLine(xcenter-1, ycenter, xh, yh);
        lastxs=xs; lastys=ys;
        lastxm=xm; lastym=ym;
        lastxh=xh; lastyh=yh;
        lastdate = today;
        currentDate=null;
    }
 
 
 
 
 
 
 
 
    public void start() {
        timer = new Thread(this);
        timer.start();
    }
 
    public void stop() {
        timer = null;
    }
 
    public void run() {
        Thread me = Thread.currentThread();
        while (timer == me) {
            try {
                Thread.currentThread().sleep(100);
            } catch (InterruptedException e) {
            }
            repaint();
        }
    }
 
    public void update(Graphics g) {
        paint(g);
    }
 
    public String getAppletInfo() {
        return "Title: A Clock \nAuthor: Rachel Gollub, 1995 \nAn analog clock.";
    }
  
    public String[][] getParameterInfo() {
        String[][] info = {
            {"bgcolor", "hexadecimal RGB number", "The background color. Default is the color of your browser."},
            {"fgcolor1", "hexadecimal RGB number", "The color of the hands and dial. Default is blue."},
            {"fgcolor2", "hexadecimal RGB number", "The color of the seconds hand and numbers. Default is dark gray."}
        };
        return info;
    }
}

[ April 21, 2007: Message edited by: Jack Bolton ]

[Ulf Dittmer]

You don't seem to ever call the start method. In applets, the method is called by the container, but the code you have is not an applet.

[Jack Bolton]

thanks.
you're a genius!