Path2D和线程控制问题

hui94781674 2009-11-05 10:08:20

这个程序主要是写个画线回放的功能，画一线可以回放画，可是画了两条之后，回放就没办法了！
问题一、其中的原因是Path2D没有设置moveTo属性，会直接lineTo了！有什么办法可以获得Path2D的一条线段的起始路径。查了api里面有个Path2D里面有个getPathIterator（）有点看晕了··不是很明白这个
问题二、线程控制，怎么控制等待rePlayer()进程结束了，才能执行其他的。
问题三、DrawPanel我是通过单例模式去调用repaint()方法的，这样好么？？
这是以下的代码有点长。。
DrawFrame.java



import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JMenuBar;



/**

 *@author  *@version 2009-11-5 上午09:07:54

 **/

public class DrawFrame extends JFrame{

	/**

	 * serialVersionUID

	 */

	private static final long serialVersionUID = -1578708905385949085L;

	JButton jButton1 = new JButton("replay");

	JMenuBar menuBar = new JMenuBar();

	DrawPanel panel = DrawPanel.getInstance();

	public DrawFrame(){

		jButton1.addActionListener(new ReplayAction());

		menuBar.add(jButton1);

		setJMenuBar(menuBar);

		add(panel);

		setSize(300, 300);

		setVisible(true);	

		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		

	}

	

	public static void main(String[] args) {

		new DrawFrame();

	}



}

DrawPanel.java

import java.awt.Color;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Point;

import java.awt.RenderingHints;

import java.awt.geom.Path2D;

import java.util.LinkedList;



import javax.swing.JPanel;



/**

 *@author lyh 

 *@version 2009-11-5 上午09:07:29

 **/

public class DrawPanel extends JPanel{

	

	/**

	 * 

	 */

	private static final long serialVersionUID = -1785727004852384096L;

    private Path2D path = new Path2D.Double();

    private Path2D path2d = new Path2D.Double();	

    private int type = 1; //默认的type为1画，2是replay 

	private LinkedList<Point> points = new LinkedList<Point>();

	private static DrawPanel drawPanel = new DrawPanel();

	public static synchronized DrawPanel getInstance(){

		if (drawPanel == null) {

			return new DrawPanel();			

		}

		else {

		    return drawPanel;	

		}

	}

	public DrawPanel(){

		addMouseListener(new MouserListener(path, points));

		addMouseMotionListener(new MouserListener(path, points));

		setBackground(Color.white);

	}

/**

 * 初始化replayer 

 */

	public void replayer(){

		rePlayer replay = new rePlayer();

	    replay.start();

		

	}

	class rePlayer extends Thread{ 

			

        

		@Override

		public void run() {

			path2d.moveTo(points.get(0).x, points.get(0).y);

			for (int i = 0; i < points.size(); i++) {

				path2d.lineTo(points.get(i).x, points.get(i).y);

				try {

					sleep(50);

				} catch (InterruptedException e) {

					// TODO Auto-generated catch block

					e.printStackTrace();

				}

				repaint();

			}

			path2d.reset();

			setType(1);

			

		}

		

	}

	

	/**

	 * type的get set方法

	 */

	public void setType(int type){

		this.type = type;

	}

	public int getType(){

		return type;

	}

		

	@Override

	protected void paintComponent(Graphics g) {

		super.paintComponent(g);

		Graphics2D g2d = (Graphics2D)g;

		g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);//设置抗锯齿  

		if (type == 1) { //如果是画图直接画

			

			g2d.draw(path);	

			System.out.println("type=1");

		}

		else if(type == 2) { //如果是回放类型

			g2d.draw(path2d);

			System.out.println("type=2");

			

		}

		

	}



	

}

MouserListener.java

import java.awt.Point;

import java.awt.event.MouseAdapter;

import java.awt.event.MouseEvent;

import java.awt.event.MouseMotionListener;

import java.awt.geom.Path2D;

import java.util.LinkedList;



/**

 *@author lyh 

 *@version 2009-11-5 下午02:09:14

 **/

public class MouserListener extends MouseAdapter implements MouseMotionListener{

       /**

	 * 

	 */

	private static final long serialVersionUID = -7481383458319135340L;

	Path2D path;

	LinkedList<Point> points;

	public MouserListener(Path2D path,LinkedList<Point> points){

		this.path = path;

		this.points = points;

	}



	public void mousePressed(MouseEvent e) {

		path.moveTo(e.getX(), e.getY());

		points.add(e.getPoint());

		

	}



	public void mouseReleased(MouseEvent e) {

        path.lineTo(e.getX(), e.getY());

		points.add(e.getPoint());

        DrawPanel.getInstance().repaint();

	}

	

	public void  mouseClicked(MouseEvent e) {

		

	    

		

	}

	@Override

	public void mouseDragged(MouseEvent e) {

		path.lineTo(e.getX(), e.getY());

		points.add(e.getPoint());

		DrawPanel.getInstance().repaint();

		

	}

	@Override

	public void mouseMoved(MouseEvent e) {



	}



}

ReplayAction.java

import java.awt.event.ActionEvent;



import javax.swing.AbstractAction;



/**

 *@author lyh 

 *@version 2009-11-5 下午02:51:01

 **/

public class ReplayAction extends AbstractAction{



	/**

	 * serialVersionUID

	 */

	private static final long serialVersionUID = 3198330808622925641L;



	@Override

	public void actionPerformed(ActionEvent e) {

		DrawPanel.getInstance().setType(2);

		DrawPanel.getInstance().replayer();

		

	}



}