import java.awt.*; import java.applet.Applet; import java.util.*; import java.awt.image.*; /** * Class SBB_Uhr - the famous clock of the Swiss Railway (SBB: Schweizerische Bundesbahn) * created with BlueJ * * @author (Martin Lieberherr) * @version (May 17th, 2011) */ public class SBB_Uhr extends Applet implements Runnable { int nx = 400; // width of applet window in pixel int ny = nx; // height of applet window in pixel int r = Math.round(nx/2); // radius of circle int cx = r; // x-coordinate of center of circle int cy = r; // y-coordinate of c. of circle double co, si, t; // time / temp. var. int[] drawHandx = new int[4]; int[] drawHandy = new int[4]; int[] hourHandx = new int[4]; int[] hourHandy = new int[4]; int[] minHandx = new int[4]; int[] minHandy = new int[4]; int[] secHandx = new int[4]; int[] secHandy = new int[4]; // buffered image for display of clock without hands BufferedImage BuffImage1 = new BufferedImage(nx, ny, BufferedImage.TYPE_INT_RGB); Graphics g1 = BuffImage1.createGraphics(); // buffered image for display of clock with hands BufferedImage BuffImage2 = new BufferedImage(nx, ny, BufferedImage.TYPE_INT_RGB); Graphics g2 = BuffImage2.createGraphics(); Thread thread; public void init() { // draw clock without hands in buffered image g1.setColor(Color.white); g1.fillRect(0,0,nx,ny); g1.setColor(Color.lightGray); g1.fillOval(1,1,nx-2,ny-2); g1.setColor(Color.white); g1.fillOval((int) (0.025*nx), (int) (0.025*ny) , (int) (0.95*nx) , (int) (0.95*ny) ); g1.setColor(Color.black); // draw the hour-marks hourHandx[0] = (int) Math.round(0.025*r); hourHandy[0] = (int) Math.round(0.7*r); hourHandx[1] = (int) Math.round(0.025*r); hourHandy[1] = (int) Math.round(0.9*r); hourHandx[2] = (int) Math.round(-0.025*r); hourHandy[2] = (int) Math.round(0.9*r); hourHandx[3] = (int) Math.round(-0.025*r); hourHandy[3] = (int) Math.round(0.7*r); for (int i = 0; i<12; i++) { t = -2.0*Math.PI*((double) i)/12.0; si = Math.sin(t); co = Math.cos(t); for (int j=0; j<4; j++) { drawHandx[j] = (int) Math.round( cx+ hourHandx[j]*co - hourHandy[j]*si); drawHandy[j] = (int) Math.round( cy- hourHandx[j]*si - hourHandy[j]*co); } g1.fillPolygon( drawHandx, drawHandy, 4); } // draw the minute-marks hourHandx[0] = (int) Math.round(0.015*r); hourHandy[0] = (int) Math.round(0.83*r); hourHandx[1] = (int) Math.round(0.015*r); hourHandy[1] = (int) Math.round(0.9*r); hourHandx[2] = (int) Math.round(-0.015*r); hourHandy[2] = (int) Math.round(0.9*r); hourHandx[3] = (int) Math.round(-0.015*r); hourHandy[3] = (int) Math.round(0.83*r); for (int i = 0; i<60; i++) { t = -2.0*Math.PI*((double) i)/60.0; si = Math.sin(t); co = Math.cos(t); for (int j=0; j<4; j++) { drawHandx[j] = (int) Math.round( cx+ hourHandx[j]*co - hourHandy[j]*si); drawHandy[j] = (int) Math.round( cy- hourHandx[j]*si - hourHandy[j]*co); } g1.fillPolygon( drawHandx, drawHandy, 4); } // prepare the polygon for the hour-hand hourHandx[0] = (int) Math.round(0.045*r); hourHandy[0] = (int) Math.round(-0.15*r); hourHandx[1] = (int) Math.round(0.035*r); hourHandy[1] = (int) Math.round(0.6*r); hourHandx[2] = (int) Math.round(-0.035*r); hourHandy[2] = (int) Math.round(0.6*r); hourHandx[3] = (int) Math.round(-0.045*r); hourHandy[3] = (int) Math.round(-0.15*r); // prepare the polygon for the minute-hand minHandx[0] = (int) Math.round(0.035*r); minHandy[0] = (int) Math.round(-0.15*r); minHandx[1] = (int) Math.round(0.03*r); minHandy[1] = (int) Math.round(0.85*r); minHandx[2] = (int) Math.round(-0.03*r); minHandy[2] = (int) Math.round(0.85*r); minHandx[3] = (int) Math.round(-0.035*r); minHandy[3] = (int) Math.round(-0.15*r); // prepare the polygon for the seconds-hand secHandx[0] = (int) Math.round(0.015*r); secHandy[0] = (int) Math.round(-0.2*r); secHandx[1] = (int) Math.round(0.015*r); secHandy[1] = (int) Math.round(0.6*r); secHandx[2] = (int) Math.round(-0.015*r); secHandy[2] = (int) Math.round(0.6*r); secHandx[3] = (int) Math.round(-0.015*r); secHandy[3] = (int) Math.round(-0.2*r); thread= new Thread(this); // thread is a new thrad of this applet thread.start(); // start the thread } public void destroy() { thread = null; // set thread to zero if applet is stopped } public void run() { while (true) // endless loop { Calendar cal = new GregorianCalendar(); // date and time now! // Get the components of the time //int hour12 = cal.get(Calendar.HOUR); // 0..11 //int hour24 = cal.get(Calendar.HOUR_OF_DAY); // 0..23 //int min = cal.get(Calendar.MINUTE); // 0..59 //int sec = cal.get(Calendar.SECOND); // 0..59 //int ms = cal.get(Calendar.MILLISECOND); // 0..999 //int ampm = cal.get(Calendar.AM_PM); // 0=AM, 1=PM // draw the clock without the hands g2.drawImage( BuffImage1, 0, 0, null); // draw the hours-hand g2.setColor(Color.black); t = -2.0*Math.PI*((double) cal.get(Calendar.HOUR))/12.0; t = t + -2.0*Math.PI*((double) cal.get(Calendar.MINUTE))/60.0/12.0; si = Math.sin(t); co = Math.cos(t); for (int j=0; j<4; j++) { drawHandx[j] = (int) Math.round( cx+ hourHandx[j]*co - hourHandy[j]*si); drawHandy[j] = (int) Math.round( cy- hourHandx[j]*si - hourHandy[j]*co); } g2.fillPolygon( drawHandx, drawHandy, 4); // draw the minutes-hand t = -2.0*Math.PI*((double) cal.get(Calendar.MINUTE))/60.0; si = Math.sin(t); co = Math.cos(t); for (int j=0; j<4; j++) { drawHandx[j] = (int) Math.round( cx+ minHandx[j]*co - minHandy[j]*si); drawHandy[j] = (int) Math.round( cy- minHandx[j]*si - minHandy[j]*co); } g2.fillPolygon( drawHandx, drawHandy, 4); // draw the seconds-hand g2.setColor(Color.red); t = (double) cal.get(Calendar.SECOND) + 0.001*cal.get(Calendar.MILLISECOND); t = 61.0*t/60.0; // seconds-hand runs fast t = Math.min(t, 60.0); t = -2.0*Math.PI*t/60; si = Math.sin(t); co = Math.cos(t); for (int j=0; j<4; j++) { drawHandx[j] = (int) Math.round( cx+ secHandx[j]*co - secHandy[j]*si); drawHandy[j] = (int) Math.round( cy- secHandx[j]*si - secHandy[j]*co); } g2.fillPolygon( drawHandx, drawHandy, 4); g2.fillOval( cx+(int) (-0.6*r*si - 0.1*r), cy-(int) (0.6*r*co + 0.1*r), (int) (0.2*r), (int) (0.2*r) ); g2.setColor(Color.black); g2.fillOval( cx-(int) (0.01*r), cy-(int) (0.01*r), (int) (0.02*r), (int) (0.02*r)); repaint(); // call paint() try // try to wait 40 milliseconds { Thread.sleep(40); } catch (InterruptedException e) // if this did not word { System.out.println(e); // print the exception } } } /** update()-method for applet * (overridden to avoid flicker) * @param g the Grapics object for this applet */ public void update( Graphics g ) { //display buffered image g.drawImage( BuffImage2, 0, 0, null); } // end update() public void paint( Graphics g ) { update(g); } }