Write a program that takes as command-line arguments an integer N and a double v
ID: 3542980 • Letter: W
Question
Write a program that takes as command-line arguments an integer N and a double value p (between 0 and 1), plots N equally spaced points of size on the circumference of a circle, and then, with probability p for each pair of points, draws a gray line connecting them.
Explanation / Answer
This will do it for you. Just incorporate the probability with it :)
public class CircleTest extends JPanel {
private static final int SIZE = 256;
private int a = SIZE / 2;
private int b = a;
private int r = 4 * SIZE / 5;
private int n;
/** @param n the desired number of circles. */
public CircleTest(int n) {
super(true);
this.setPreferredSize(new Dimension(SIZE, SIZE));
this.n = n;
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(
RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setColor(Color.black);
a = getWidth() / 2;
b = getHeight() / 2;
int m = Math.min(a, b);
r = 4 * m / 5;
int r2 = Math.abs(m - r) / 2;
g2d.drawOval(a - r, b - r, 2 * r, 2 * r);
g2d.setColor(Color.blue);
for (int i = 0; i < n; i++) {
double t = 2 * Math.PI * i / n;
int x = (int) Math.round(a + r * Math.cos(t));
int y = (int) Math.round(b + r * Math.sin(t));
g2d.fillOval(x - r2, y - r2, 2 * r2, 2 * r2);
}
}
private static void create() {
JFrame f = new JFrame();
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.add(new CircleTest(9));
f.pack();
f.setVisible(true);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
create();
}
});
}
}
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