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Java Source | 1996-04-26 | 5.1 KB | 178 lines |
- /*
- * Copyright (c) 1994-1996 Sun Microsystems, Inc. All Rights Reserved.
- *
- * Permission to use, copy, modify, and distribute this software
- * and its documentation for NON-COMMERCIAL or COMMERCIAL purposes and
- * without fee is hereby granted.
- * Please refer to the file http://java.sun.com/copy_trademarks.html
- * for further important copyright and trademark information and to
- * http://java.sun.com/licensing.html for further important licensing
- * information for the Java (tm) Technology.
- *
- * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF
- * THE SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
- * TO THE IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
- * PARTICULAR PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR
- * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
- * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
- *
- * THIS SOFTWARE IS NOT DESIGNED OR INTENDED FOR USE OR RESALE AS ON-LINE
- * CONTROL EQUIPMENT IN HAZARDOUS ENVIRONMENTS REQUIRING FAIL-SAFE
- * PERFORMANCE, SUCH AS IN THE OPERATION OF NUCLEAR FACILITIES, AIRCRAFT
- * NAVIGATION OR COMMUNICATION SYSTEMS, AIR TRAFFIC CONTROL, DIRECT LIFE
- * SUPPORT MACHINES, OR WEAPONS SYSTEMS, IN WHICH THE FAILURE OF THE
- * SOFTWARE COULD LEAD DIRECTLY TO DEATH, PERSONAL INJURY, OR SEVERE
- * PHYSICAL OR ENVIRONMENTAL DAMAGE ("HIGH RISK ACTIVITIES"). SUN
- * SPECIFICALLY DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY OF FITNESS FOR
- * HIGH RISK ACTIVITIES.
- */
-
- // author: Rachel Gollub, 1995
- // modified 96/04/24 Jim Hagen : use getBackground()
-
- // Time!
-
- import java.util.*;
- import java.awt.*;
- import java.applet.*;
-
- public class Clock2 extends Applet implements Runnable {
- Thread timer = null;
- int lastxs=0, lastys=0, lastxm=0, lastym=0, lastxh=0, lastyh=0;
- Date dummy = new Date();
- String lastdate = dummy.toLocaleString();
-
- public void init() {
- int x,y;
- resize(300,300); // 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, m, h, xcenter, ycenter;
- String today;
- Date dat = new Date();
-
- s = dat.getSeconds();
- m = dat.getMinutes();
- h = dat.getHours();
- today = dat.toLocaleString();
- 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(new Font("TimesRoman", Font.PLAIN, 14));
- g.setColor(Color.blue);
- circle(xcenter,ycenter,50,g);
- g.setColor(Color.darkGray);
- 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(Color.darkGray);
- g.drawString(today, 5, 125);
- g.drawLine(xcenter, ycenter, xs, ys);
- g.setColor(Color.blue);
- 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;
- }
-
- public void start() {
- if(timer == null)
- {
- timer = new Thread(this);
- timer.start();
- }
- }
-
- public void stop() {
- timer = null;
- }
-
- public void run() {
- while (timer != null) {
- try {Thread.sleep(100);} catch (InterruptedException e){}
- repaint();
- }
- timer = null;
- }
-
- public void update(Graphics g) {
- paint(g);
- }
- }
-
-