Calculate Rotation Transform with Math.PI : Tranformation « 2D Graphics « Java Tutorial

1. Java Tutorial
2. 2D Graphics
3. Tranformation

import java.awt.Canvas;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.geom.AffineTransform;
import java.awt.geom.Line2D;

import javax.swing.JFrame;

public class Draw2DRotate extends JFrame {
  public static void main(String args[]) {
    Draw2DRotate app = new Draw2DRotate();
  }

  public Draw2DRotate() {
    add("Center", new MyCanvas());

    setSize(400, 400);
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setVisible(true);
  }

}

class MyCanvas extends Canvas {
  public void paint(Graphics graphics) {
    Graphics2D g = (Graphics2D) graphics;
    AffineTransform transform = AffineTransform.getRotateInstance(Math.PI / 16.0d);
    g.setTransform(transform);
    Line2D.Double shape = new Line2D.Double(0.0, 0.0, 300.0, 300.0);
    g.draw(shape);
    g.setFont(new Font("Helvetica", Font.BOLD, 24));
    String text = ("Java2s");
    g.drawString(text, 300, 50);
    Toolkit toolkit = Toolkit.getDefaultToolkit();
    Image image = toolkit.getImage("image1.gif");
    g.drawImage(image, 100, 150, this);
  }
}

16.3.Tranformation
	16.3.1.	Transform Lab
	16.3.2.	Coordinate Translation.
	16.3.3.	Rotation and coordinate translation
	16.3.4.	Rotate a line of character (String)
	16.3.5.	Scaling an object
	16.3.6.	Tranformation with AffineTransform.getScaleInstance
	16.3.7.	Tranformation with AffineTransform.getTranslateInstance
	16.3.8.	Tranformation with AffineTransform.getShearInstance
	16.3.9.	Calculate Rotation Transform with Math.PI
	16.3.10.	Rotating image using Java 2D AffineTransform class
	16.3.11.	Translate and rotate all objects
	16.3.12.	Move and scale graphical objects with a mouse on the panel
	16.3.13.	Rotates a shape about the specified coordinates.