Example usage for java.lang Math PI

Introduction

In this page you can find the example usage for java.lang Math PI.

Prototype

double PI

To view the source code for java.lang Math PI.

Click Source Link

Document

The double value that is closer than any other to pi, the ratio of the circumference of a circle to its diameter.

Usage

From source file:Main.java

public static void main(String[] args) {

    // get a variable x which is equal to PI/2
    double x = Math.PI / 2;

    // get a variable y which is equal to PI/3
    double y = Math.PI / 3;

    // convert x  and y to degrees
    x = Math.toDegrees(x);/*w ww .  ja  v a  2 s.  c  o m*/
    y = Math.toDegrees(y);

    // get the polar coordinates
    System.out.println("Math.atan2(" + x + "," + y + ")=" + Math.atan2(x, y));

}

From source file:MainClass.java

public static void main(String args[]) {
    double radians = 0.45 * Math.PI / 180;
    System.out.println("cos = " + Math.cos(radians));

}

From source file:MainClass.java

public static void main(String args[]) {
    double radians = 0.45 * Math.PI / 180;
    System.out.println("sin = " + Math.sin(radians));

}

From source file:MainClass.java

public static void main(String args[]) throws Exception {
    System.out.printf("num is %.2f\n", Math.PI);

}

From source file:MainClass.java

public static void main(String args[]) throws Exception {
    System.out.printf("num is %f\n", Math.PI);

}

From source file:CircleAreaApp.java

public static void main(String[] args) {
    System.out.print("Enter the radius of your circle: ");
    double r = sc.nextDouble();
    double area = Math.PI * (r * r);
    System.out.println("The area is " + area);
}

From source file:Main.java

public static void main(String[] args) throws Exception {
    Hashtable h = new Hashtable();
    h.put("string", "AAA");
    h.put("int", new Integer(26));
    h.put("double", new Double(Math.PI));

    FileOutputStream fileOut = new FileOutputStream("hashtable.ser");
    ObjectOutputStream out = new ObjectOutputStream(fileOut);
    out.writeObject(h);//from w w w.  j av  a2  s. c  o  m

    FileInputStream fileIn = new FileInputStream("h.ser");
    ObjectInputStream in = new ObjectInputStream(fileIn);
    Hashtable h = (Hashtable) in.readObject();
    System.out.println(h.toString());
}

From source file:MainClass.java

public static void main(String[] args) throws Exception {
    Document document = new Document();
    PdfWriter.getInstance(document, new FileOutputStream("2.pdf"));
    document.open();/*from  www. j  a  va 2s .  c  o m*/
    Image jpg1 = Image.getInstance("dog.jpg");
    jpg1.scalePercent(80);
    jpg1.setRotation((float) Math.PI / 6);
    document.add(new Paragraph("rotate 30 degrees"));
    document.add(jpg1);
    document.add(new Paragraph("Original width: " + jpg1.width() + "; original height: " + jpg1.height()));
    document.close();
}

From source file:ImageRotatingPDF.java

public static void main(String[] args) {
    Document document = new Document();
    try {//from  w  w w  . j a v  a  2 s  .c om
        PdfWriter.getInstance(document, new FileOutputStream("ImageRotatingPDF.pdf"));
        document.open();

        Image jpg = Image.getInstance("logo.png");
        jpg.setAlignment(Image.MIDDLE);

        jpg.setRotation((float) Math.PI / 6);
        document.add(new Paragraph("rotate 30 degrees"));
        document.add(jpg);
        document.newPage();

    } catch (Exception e) {
        System.err.println(e.getMessage());
    }
    document.close();
}

From source file:Main.java

public static void main(String[] args) throws IOException {
    BufferedImage original = ImageIO.read(new URL("http://www.java2s.com/style/download.png"));

    GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();
    GraphicsDevice gd = ge.getDefaultScreenDevice();
    GraphicsConfiguration gc = gd.getDefaultConfiguration();

    BufferedImage rotated1 = create(original, -Math.PI / 2, gc);
    BufferedImage rotated2 = create(original, +Math.PI / 4, gc);
    BufferedImage rotated3 = create(original, Math.PI, gc);

    JPanel cp = new JPanel();
    cp.add(new JLabel(new ImageIcon(original)));
    cp.add(new JLabel(new ImageIcon(rotated1)));
    cp.add(new JLabel(new ImageIcon(rotated2)));
    cp.add(new JLabel(new ImageIcon(rotated3)));

    JFrame f = new JFrame();
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    f.setContentPane(cp);//  www  .j av a  2 s  .com
    f.pack();
    f.setVisible(true);

}