haiming3.java

java的小例子 java的小例子 java的小例子

import java.awt.*;
import java.awt.event.*;
import java.math.*;
class Mypanel extends Panel implements ActionListener{
	float x1=0,y1=0,x2=100,y2=200;
	float x,y;
	TextField t1,t2;
	Button b1;
	Mypanel(){
		setSize(400,400);
		setLayout(null);
		setBackground(Color.blue);
		setVisible(true);
		t1=new TextField(10);
		t2=new TextField(10);
		b1=new Button("点我啊");
		b1.addActionListener(this);
		b1.setBounds(300,5,60,30);
		t2.setBounds(220,5,60,30);
		t1.setBounds(140,5,60,30);
	add(b1);
	add(t1);
	add(t2);
		
	}
	public void paint(Graphics g){
		y=y2;
for(x=100;x>0.3;x=(float)(y2-y1)){
	g.setColor(Color.green);
	g.drawLine((int)x1,(int)y1,(int)x1+1,(int)y1+1);
	g.setColor(Color.black);
	g.drawLine((int)x2,(int)y2,(int)x2+1,(int)y2+1);
	
	y2=y2+(float)0.1;
	x1=x1+(float)(0.3*(x2-x1)/Math.sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)));
	y1=y1+(float)(0.3*(y2-y1)/Math.sqrt((x2-x1)*(x2-x1)+(y2-y1)*(y2-y1)));
	}
	System.out.println("时间是"+(float)(y2-y)/10+"分钟;其余自己去算!");
		}
		public void actionPerformed(ActionEvent e){
		x2=Integer.parseInt(t1.getText());
		x2=x2*10;
		y2=Integer.parseInt(t2.getText());
		y2=y2*10;
		x1=0;
		y1=0;
		
		repaint();	
		}
	}
	
	class haiming1{
		public static void main(String args[]){
			Frame m=new Frame("画图画图哈哈");
			Mypanel f=new Mypanel();
			m.add(f);
			m.setSize(404,404);
			m.setVisible(true);
		
		}
		}