tree.java

一个用Java编写的分形程序。分形(Fractal)理论是Mandelbrot于20世纪70年代提出的一门非线性学科

/*
  作者 连惠城
  1999
*/

import java.awt.*;
import java.util.Stack;
import java.util.Vector;
import java.awt.event.*;
import java.lang.*;

public class MyFractal
    extends java.applet.Applet
   
{
     POT init =new POT(0.0,0.0);
  
     int k;
     static double r=5;
     Graphics g;
    
   public void paint(Graphics g)
   
    {   
    	g.setColor(Color.blue);
        g.draw3DRect(10,10,195,20,false);
      	g.drawString("这是用随机分形画出来的橛叶!",28,24);
      	
      	g.setColor(Color.yellow);
        g.drawString("作者： 连惠城 ",500-100,400-15);
    	
    	g.setColor(Color.red);
    	
    	   for(  int i=0;i<500;i++)
       {

          k=0;
        
        
          pifs(g,init);
          
         
         
           }

     
    }


void pifs(Graphics g,POT X)
{ POT newX=new POT(2.0,2.0);
  double rand1;
  float lon;
  
//repaint();
//g.drawString("aaa",100+10,200);


rand1=mrnd1(g,r);


k++;

 


  if(rand1>=0.00 & rand1< 0.01) newX=tran1(X);
  else if (rand1>=0.01 & rand1< 0.86) newX=tran2(X);
  else if(rand1>=0.86 & rand1< 0.93) newX=tran3(X);
  else if(rand1>=0.93 & rand1<=1.0) newX=tran4(X);


   if(k>100)
     Pixel(g,newX);




  if(k>500)
      return;
      

 

  pifs(g,newX);
  }


/*---------*/

POT tran1(POT X)
{
 POT Temp =new POT(0.0,X.y*0.16);

 return(Temp);
 }
/*----------*/

POT tran2(POT X)
{POT Temp =new POT(0.85*X.x+0.04*X.y,-0.04*X.x+0.85*X.y+60);

 return(Temp);
 }
/*----------*/
POT tran3(POT X)
{POT Temp =new POT(0.2*X.x-0.26*X.y,0.23*X.x+0.22*X.y+70);

 return(Temp);
 }
/*----------*/
POT tran4(POT X)
{POT Temp =new POT(-0.15*X.x+0.28*X.y,+0.26*X.x+0.24*X.y+70);

 return(Temp);
 }
/*----------*/





/*-------*/

void Pixel(Graphics g,POT X)

{ int gX=(int)(X.x+250);
  int gY=(int)(-X.y+390);
    
     g.drawLine(gX,gY,gX,gY);
 	 
 }	


 /*----------*/
 double mrnd1(Graphics g, double r)

  { 
 
    return(Math.random());
  }


        
        
}        

////end of class CLSFractal

    
    

//////////
class POT{

   double x;
   double y;
   
 public POT(double x,double y)
   { this.x=x;
     this.y=y;
     return;
  }



}