swing

G_G — Thu, 26 Apr 2007 03:54:00 GMT

图象拖动（简单）
代码上哈解释不多！！！
    ^_^

package src.jframe;

import javax.swing.JFrame;
import javax.swing.JOptionPane;

import java.awt.Event;
import java.awt.Graphics;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import java.util.ArrayList;

public class MyFrame implements MouseListener,MouseMotionListener {
    //图象集合
    private ArrayList list = new ArrayList();
    //当前拖动图象
    private Rectangle re = null ;


    private  JFrame jf ;
    {
        jf = new JFrame(){
            public void paint(Graphics g){
                super.paint(g);
                for(int i=0;i<list.size();i++){
                    Rectangle ne =    (Rectangle)list.get(i);
                    this.getGraphics().drawRect(ne.x,ne.y,ne.height,ne.width);
                    System.out.println("ok");
                }
            }
        };
        jf.addWindowListener(new WindowListener(){

            public void windowActivated(WindowEvent e) {
                // TODO Auto-generated method stub

            }

            public void windowClosed(WindowEvent e) {
                // TODO Auto-generated method stub

            }

            public void windowClosing(WindowEvent e) {
                System.exit(0);

            }

            public void windowDeactivated(WindowEvent e) {
                // TODO Auto-generated method stub

            }

            public void windowDeiconified(WindowEvent e) {
                // TODO Auto-generated method stub

            }

            public void windowIconified(WindowEvent e) {
                // TODO Auto-generated method stub

            }

            public void windowOpened(WindowEvent e) {
                // TODO Auto-generated method stub

            }

        });
        jf.setBounds(400,400,400,400);
        jf.addMouseListener(this);
        jf.addMouseMotionListener(this);
        jf.setVisible(true);
    }

     public JFrame getFrame(){
         return this.jf ;
     }

    //双击花出图象
    public void mouseClicked(MouseEvent e) {
        if(e.getClickCount() == 2){
        Point po = e.getPoint() ;
        Rectangle ne = new Rectangle();
        ne.setBounds((int)po.getX(),(int)po.getY(),20,20);
        System.out.println("ko1");
        addList(ne);  //添加入集合
        }
    }
    private void addList(Rectangle ne) {
        list.add(ne);
        this.jf.repaint();
    }


    public void mouseEntered(MouseEvent e) {

    }

    public void mouseExited(MouseEvent e) {

    }

    // 拖动选取
    public void mousePressed(MouseEvent e) {
        this.re = null ;
        for(int i=0;i<this.list.size();i++){
            Rectangle re = (Rectangle)list.get(i);
            if( re.contains((int)e.getX(),(int)e.getY()) ){
                this.re = re;
            }
        }
    }

    public void mouseReleased(MouseEvent e) {
    }

    //关键拖动 ***********************
    public void mouseDragged(MouseEvent e) {
            if(this.re != null){
                this.re.setBounds((int)e.getX(),(int)e.getY(),20,20);
                this.jf.repaint();
            }

    }

    public void mouseMoved(MouseEvent e) {
    }


    public static void main(String[]args){

        JFrame jf = (new MyFrame()).getFrame();

    }
}

图象的缩放Graphics2D *******

    protected void paintComponent(Graphics g) {

        Graphics2D g2d = (Graphics2D)g;
        double bh =    fh / 1200 ;
        double bw =   fw / 600;
        g2d.scale(bh,bw);
        getDisplayUpdate().draw(g2d, this);
        this.setBackground(this.getBg());
    }

G_G 2007-04-26 11:54 发表评论

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