JavaSwing图形界面编程之BufferedImage（一）

package three.day.frame;

import java.awt.AlphaComposite;

import java.awt.BasicStroke;

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.Container;

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.geom.AffineTransform;

import java.awt.geom.Arc2D;

import java.awt.geom.CubicCurve2D;

import java.awt.geom.Ellipse2D;

import java.awt.geom.GeneralPath;

import java.awt.geom.Line2D;

import java.awt.geom.QuadCurve2D;

import java.awt.geom.Rectangle2D;

import java.awt.geom.RoundRectangle2D;

import java.awt.image.BufferedImage;

import javax.swing.JFrame;

import javax.swing.JPanel;

public class BufferedImage01

{

public BufferedImage01()

{

JFrame f = new JFrame("draw geom");

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.setLocation(350, 50);

drawPanel dp = new drawPanel();

dp.setPreferredSize(new Dimension(600,600));

Container ct = f.getContentPane();

dp.setBackground(Color.WHITE);

ct.add(dp,BorderLayout.CENTER);

f.pack();

f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

f.setVisible(true);

}

public static void main(String[] args)

{

new BufferedImage01();

}

}

class drawPanel extends JPanel

{

public void paint(Graphics g)

{

Graphics2D g2 = (Graphics2D)g;

Line2D.Double ln1 = new Line2D.Double(20.0,20.0,80.0,40.0);

QuadCurve2D.Double qc = new QuadCurve2D.Double(130.0,30.0,150.0,50.0,170.0,20.0);

CubicCurve2D.Double cc = new CubicCurve2D.Double(220.0,40.0,240.0,60.0,260.0,20.0,300.0,35.0);

Rectangle2D.Double rect = new Rectangle2D.Double(10,10,100,100);

RoundRectangle2D.Double rRect = new RoundRectangle2D.Double(10,80, 200, 100, 20, 20);

Ellipse2D.Double ellipse = new Ellipse2D.Double(0,300, 100, 100);

Arc2D.Double arc = new Arc2D.Double(200,200, 200, 200, 0, 90,/*Arc2D.OPEN Arc2D.CHORD*/Arc2D.PIE );

GeneralPath polygon =new GeneralPath();

polygon.moveTo(200, 200);

polygon.lineTo(400, 400);

polygon.lineTo(400, 200);

polygon.closePath();

BasicStroke bs = new BasicStroke(5);

g2.translate(300, 100);

g2.rotate(45*Math.PI/180);

g2.setStroke(bs);

g2.setPaint(Color.red);

g2.draw(ln1);

g2.draw(qc);

g2.draw(cc);

g2.draw(rect);

g2.draw(ellipse);

g2.draw(rRect);

g2.draw(arc);

g2.setTransform(new AffineTransform());

BufferedImage bi = new BufferedImage(400,400, BufferedImage.TYPE_INT_ARGB);

Graphics2D gdi = (Graphics2D) bi.getGraphics();

gdi.setColor(Color.YELLOW);

gdi.fill(rect);

AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.DST_IN,1.0f);

gdi.setComposite(ac);

gdi.setPaint(Color.green);

gdi.fill(ellipse);

gdi.fill(rRect);

gdi.fill(arc);

gdi.setPaint(Color.darkGray);

gdi.draw(polygon);

g2.drawImage(bi, null, 0, 0);

}

}