chapter2.java

数值算法例子,牛顿插值,拉格朗日,三次样条

/*@author 邱宇峰 ,software project031,
 *2004,10,8
 */

 import java.awt.*;
 import java.awt.event.*;

 public class chapter2 extends Frame implements ActionListener,ItemListener,MouseListener{
  	static chapter2 frm=new chapter2();
 	static Graphics g;
 	static Panel pl;
	static Button b;
 	static int count=0;
 	static int location[][]=new int[30][2];	
 	static Choice ch=new Choice();	
 	public static void main(String[] args){
 		pl=new Panel();
 		pl.setLayout(new FlowLayout());
 		b=new Button("clean");
   		b.addActionListener(frm);
 		ch.add("NewTon (Color is yellow)");
 		ch.add("Lagrange (Color is red)");
  		ch.add("ThreeSamples (Color is black)");
   		ch.addItemListener(frm);
   		pl.add(b);
  		frm.setTitle("第二章");
    	frm.add(ch,"North");
    	frm.add(pl,"South");
 		frm.setSize(500,500);
 		frm.setVisible(true);
 		frm.addMouseListener(frm);
 		frm.addWindowListener(new WindowAdapter(){public void windowClosing(WindowEvent e){System.exit(0);}
		});
		g=frm.getGraphics();
 	}
 	public void actionPerformed(ActionEvent e){
 		Graphics g=getGraphics();
 		repaint();
 		location=new int[30][2];
 		count=0;
 	}
 	public void mouseClicked(MouseEvent e){
		int x=e.getX();
		int y=e.getY();
		location[count][0]=x;location[count][1]=y;
		g.drawString("。",x,y);
		count++;
		} 
		public void mouseEntered(MouseEvent e){	}
		public void mousePressed(MouseEvent e){	}
		public void mouseExited(MouseEvent e){	}
		public void mouseReleased(MouseEvent e){}
	public void itemStateChanged(ItemEvent e){
 		int index=ch.getSelectedIndex();
 		call1 cal=new call1();
 		cal.act(index,location,count,g);
 		}
 }
 
 
 class call1{
  	void act(int choice,int location[][],int count,Graphics g){
 		switch(choice){
 			case 0:newton1 n=new newton1();n.action(location,count,g);break;
 			case 1:largeLangre1 l=new largeLangre1(location,count,g);  break;
 			case 2:threeSamples1 t=new threeSamples1(location,count,g);break;
 		} 		
 	}
  }