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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(); Font F = new Font("TimesRoman", Font.PLAIN, 14); Date dat = null; 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; 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(F); 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; dat=null; } 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); } }