Lab9

public class DecimalLED extends SevenSegmentLED {
boolean[][] st = {{true, true, true, true, true, true, false}, {false, true, true, false, false, false, false},
   {true, true, false, true, true, false, true}, {true, true, true, true, false, false, true},
   {false, true, true, false, false, true, true}, {true, false, true, true, false, true, true},
   {true, false, true, true, true, true, true}, {true, true, true, false, false, false, false},
   {true, true, true, true, true, true, true}, {true, true, true, true, false, true, true},
   {false, false, false, false, false, false, false}};
int n;
  public void setDigit(int d) {
    boolean[] s = new boolean[7];
    if ((d >= 0) && (d <= 9)) {
      s = st[d];
      n = d;
    } else {
      s = st[10];
      n = -1;
    }
   
  
     
   super.setSegments(s);


  }

  public int getDigit() {

    return n;
  }

}

import jlab.JLabIO;

import java.awt.*;
import java.awt.event.*;
import java.applet.*;

public class Lab9 extends Applet implements Runnable {
  private DecimalLED[] display = new DecimalLED[3];

  public void init() {
    for (int i = display.length - 1; i >= 0; i--) {
      display[i] = new DecimalLED();
      add(display[i]);
      display[i].setSize(40, 80);
    }
    validate();
  }

  public void start() {
    (new Thread(this)).start();
  }
  
  public void run() {
    int k;
    display[0].setDigit(0);
    while (true) {
      for (int i = 0; i < display.length; i++) {
        k = Math.max(display[i].getDigit(), 0);
        display[i].setDigit((++k) % 10);
        if (k < 10) break;
      }
      try {
        Thread.sleep(100);
      } catch (InterruptedException e) {}
    }
  }
  
  public static void main(String[] args) {
    Frame frame = new Frame("Lab9 : 7 segments");
    frame.addWindowListener(new WindowAdapter() {
        public void windowClosing(WindowEvent e) {
          System.exit(0);
        }
      }
    );
    Lab9 applet = new Lab9();
    frame.add(applet, BorderLayout.CENTER);
    frame.setSize(200, 120);
    frame.setVisible(true);
    applet.init();
    applet.start();
  }
}

import java.awt.*;

public class SevenSegmentLED extends Canvas {
  
  private boolean[] segments;
  private static final int[] NUMPOINTS = {5, 5, 7, 5, 5, 5, 5};
  private static final int[][][] SEGMENTS = {
      {{5, 35, 30, 10, 5, 0, 0}, {5, 5, 10, 10, 5, 0, 0}},
      {{35, 35, 30, 30, 35, 0, 0}, {8, 37, 34, 13, 8, 0, 0}},
      {{35, 35, 30, 30, 35, 0, 0}, {43, 72, 67, 46, 43, 0, 0}},
      {{5, 35, 30, 10, 5, 0, 0}, {75, 75, 70, 70, 75, 0, 0}},
      {{5, 5, 10, 10, 5, 0, 0}, {43, 72, 67, 46, 43, 0, 0}},
      {{5, 5, 10, 10, 5, 0, 0}, {8, 37, 34, 13, 8, 0, 0}},
      {{10, 30, 35, 30, 10, 5, 10}, {37, 37, 40, 43, 43, 40, 37}}
    };

  public SevenSegmentLED() {
    setBackground(new Color(0, 0, 0));
    setForeground(new Color(0, 255, 0));
  }

  public void setSegments(boolean[] s) {
    if (s != null) {
      segments = new boolean[s.length];
      for (int i = 0; i < s.length; i++) {
        segments[i] = s[i];
      }
      repaint();
    }
  }
  
  public void paint(Graphics g) {
    double scalex = (double) bounds().width / 40.0;
    double scaley = (double) bounds().height / 80.0;

    Color f = getForeground();
    g.setColor(f);
    for (int i = 0; i < 7; i++) {
      if (segments != null && i < segments.length && segments[i]) {
        int[][] points = new int[2][NUMPOINTS[i]];
  
        for (int j = 0; j < NUMPOINTS[i]; j++) {
          points[0][j] = (int) (SEGMENTS[i][0][j] * scalex);
          points[1][j] = (int) (SEGMENTS[i][1][j] * scaley);
        }
        g.fillPolygon(points[0], points[1], NUMPOINTS[i]);
      }
    }
  }
}