import java.awt.*;
import java.awt.Shape;        //不加这句的结果...
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;
import java.util.*;
import java.awt.image.BufferedImage;
public class Graphics2DDemo extends JFrame
{
  public Graphics2DDemo()
  {
    this.getContentPane().add(new MyPanel());
    setTitle("Graphics2D绘图方法演示");
    setSize(380,260);
    setVisible(true);
    
  }
  public static void main(String args[])
  {
    JFrame.setDefaultLookAndFeelDecorated(true);
    Font fonts=new Font("JFrame",Font.PLAIN,14);
    Enumeration keys=UIManager.getLookAndFeelDefaults().keys();
    while(keys.hasMoreElements())
    {
      Object keyss=keys.nextElement();
      if(UIManager.get(keyss) instanceof Font)
      UIManager.put(keyss,fonts);
    }
    Graphics2DDemo mainFrame=new Graphics2DDemo();
  }
}
class MyPanel extends JPanel
{
  MyPanel()
  {
    setBackground(Color.WHITE);
    setOpaque(true);
    
  }
  public void paintComponent(Graphics g)
  {
    super.paintComponent(g);
    Graphics2D g2d=(Graphics2D)g;
    BasicStroke bs=new BasicStroke(10.0f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);
    g2d.setStroke(bs);
    g2d.drawLine(30,10,100,10);
    bs=new BasicStroke(10.0f,BasicStroke.CAP_ROUND,BasicStroke.JOIN_BEVEL);
    g2d.setStroke(bs);
    g2d.drawLine(30,30,100,30);
    bs=new BasicStroke(10.0f,BasicStroke.CAP_SQUARE,BasicStroke.JOIN_BEVEL);
    g2d.setStroke(bs);
    g2d.drawLine(30,50,100,50);
    
    GeneralPath path=new GeneralPath();
    path.moveTo(140,50);
    path.lineTo(190,10);
    path.lineTo(240,50);
    bs=new BasicStroke(10.0f,BasicStroke.CAP_BUTT,BasicStroke.JOIN_BEVEL);
    g2d.setStroke(bs);
    g2d.draw(path);
    
    path.reset();
    path.moveTo(140,70);
    path.lineTo(190,30);
    path.lineTo(240,70);
    bs=new BasicStroke(10.0f,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND);
    g2d.setStroke(bs);
    g2d.draw(path);
    
    path.reset();
    path.moveTo(140,90);
    path.lineTo(190,50);
    path.lineTo(240,90);
    bs=new BasicStroke(10.0f,BasicStroke.CAP_SQUARE,BasicStroke.JOIN_MITER);
    g2d.setStroke(bs);
    g2d.draw(path);
    
    Ellipse2D e=new Ellipse2D.Float(20,60,100,50);
    GradientPaint dp=new GradientPaint(20,60,Color.YELLOW,100,50,Color.BLUE);
    g2d.setPaint(dp);
    g2d.fill(e);
    
    Image img=new ImageIcon("mmm.jpg").getImage();
    BufferedImage bImage=new BufferedImage(img.getWidth(null),img.getHeight(null),BufferedImage.TYPE_INT_RGB);
    //BufferedImage bImage=new BufferedImage(img.getWidth(),img.getHeight(),BufferedImage.TYPE_INT_RGB);
    Graphics2D g2=bImage.createGraphics();
    g2.drawImage(img,null,null);
    Rectangle2D tr=new Rectangle2D.Double(0,0,bImage.getWidth(),bImage.getHeight());
    TexturePaint tp=new TexturePaint(bImage,tr);
    g2d.setPaint(tp);
    RoundRectangle2D r=new RoundRectangle2D.Float(260,10,100,100,50,50);
    g2d.fill(r);
    
    g2d.setColor(Color.BLACK);
    g2d.setStroke(new BasicStroke(1.0f));
    Shape shapes=new Rectangle2D.Double(30,120,30,50);
    g2d.draw(shapes);
    
    AffineTransform at=AffineTransform.getTranslateInstance(60,0);
    g2d.transform(at);
    AffineTransform atx=AffineTransform.getRotateInstance(Math.PI/6,30,120);
    
    Shape nshape=atx.createTransformedShape(shapes);
    g2d.draw(nshape);
    g2d.transform(at);
    atx=AffineTransform.getShearInstance(0.0,0.3);
    nshape=atx.createTransformedShape(shapes);
    g2d.draw(nshape);
    
    Rectangle2D rr=new Rectangle2D.Float(80,120,40,40);
    Shape shapel=new Ellipse2D.Float(80,120,100,100);
    Shape oldClip=g2d.getClip();
    g2d.setClip(rr);
    g2d.fill(shapel);
     
    g2d.setClip(oldClip);
    Rectangle2D redRect=new Rectangle2D.Float(130,120,80,80);
    Rectangle2D blueRect=new Rectangle2D.Float(160,130,80,80);
    AlphaComposite ac=AlphaComposite.getInstance(AlphaComposite.SRC_OVER,0.5f);
    g2d.setPaint(Color.red);
    g2d.fill(redRect);
    g2d.setComposite(ac);
    g2d.setPaint(Color.BLUE);
    g2d.fill(blueRect);
    
  }
}