Use AffineTransform to translate - Java 2D Graphics

Java examples for 2D Graphics:Transform

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Description

Use AffineTransform to translate

Demo Code

     /* www.  ja  v  a  2s  . c o m*/

import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Rectangle2D;

import javax.swing.JFrame;
import javax.swing.JPanel;

public class Main extends JFrame
{
     
     public static void main(String[] arg)
     {
          JFrame frame = new Main();
         frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
         frame.setSize(new Dimension(400,400));
         frame.pack();
         frame.setVisible(true);
     }
     
     public Main()
     {
          super("Programming Exercise 3.11");
          JPanel contentPanel = new JPanel(new FlowLayout());
          JPanel panel = new DrawIt();
          panel.setPreferredSize(new Dimension(600,600));
          contentPanel.add(panel);
          add(contentPanel);
     }
     
     class DrawIt extends JPanel
     {
          public void paintComponent(Graphics g)
          {
               super.paintComponent(g);
               Graphics2D g2 = (Graphics2D)g;
               
               g2.translate(300, 300);
               g2.scale(1, -1);
               g2.drawLine(0, -500, 0, 500);
               g2.drawLine(-500, 0, 500, 0);
               g2.drawLine(-500, -500, 500, 500);
               
               Shape rect = null;
               Shape rect2 = null;
               rect = new Rectangle2D.Double(-50,-50,100,100);
               g2.setColor(Color.BLUE);
               g2.draw(rect);
               g2.setColor(Color.RED);     
               AffineTransform tr = new AffineTransform();
               tr.rotate(Math.PI/4);
               tr.scale(3,1);
               tr.rotate(-Math.PI/4);
               rect2 = tr.createTransformedShape(rect);
               g2.draw(rect2);
          }
     }
}

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