julia.java

这是混沌中julia集的画法程序

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
 class Julia extends MainPanel implements MouseListener,MouseMotionListener,ActionListener{
	double p, q;
	int xs,ys,xe,ye,flag=1;
	double xmin=-1.5, ymin=-1.5, xmax=1.5,ymax=1.5,zex=0,zey=0; 
	Graphics g1=getGraphics();
    public int juliaZ(double x0,double y0) {
        double xk,yk;
        int i;
        for (i=0;i<47;i++) {

            xk=x0*x0-y0*y0+p;
            yk=2*x0*y0+q;

            if (xk*xk+yk*yk>4) return 200*i;
            x0=xk;
            y0=yk;
        }
        return i;
    }
	public void init(){
		pl=new JLabel("P:");
		ql=new JLabel("Q:");
		pt=new JTextField("-0.46");
		qt=new JTextField("0.57");
		ok=new JButton("确定");
		bk=new JButton("放大");
		c.setLayout(new BorderLayout());
		
		pe.setLayout(new FlowLayout());
		pe.add(pl);
		pe.add(pt);
		pe.add(ql);
		pe.add(qt);
		pe.add(ok);
		pe.add(bk);
		c.add(pe,BorderLayout.EAST);
		addMouseMotionListener(this);
		addMouseListener(this);
		ok.addActionListener(this);
		bk.addActionListener(this);
		
	}	
	public Julia(){
		setLocation(150,100);
		setDefaultCloseOperation(2);
	}
	 public void paint (Graphics g) {
		 super.paint(g);	        
	        int x, y;
	        double tempxmin,tempymin;
	        tempxmin=xmin;
	        tempymin=ymin;
	        Color colJulia = new Color(100,0,100); // 设置颜色
	        Color col =Color.red ;
	       // p = -0.46175;
	       // q = 0.57850;
	        p=Double.parseDouble(pt.getText());
	        q=Double.parseDouble(qt.getText());
	        zex=(xmax-xmin)/800;
	        zey=(ymax-ymin)/560;
	        System.out.println("zex"+zex+" zey"+zey);
	        for (y=0;y<560;y++) {
	            tempxmin=xmin; 
	            for (x=0;x<801;x++) {
	                if (juliaZ(tempxmin,tempymin)==47) {
	                    g.setColor(colJulia);
	                    g.drawLine(x,y,x,y);
	                }
	                else if(juliaZ(tempxmin,tempymin)>47){
	                	g.setColor(new Color(juliaZ(tempxmin,tempymin)));
	                    g.drawLine(x,y,x,y);
	                }
	                tempxmin=tempxmin+zex; 
	            }
	            tempymin=tempymin+zey; 
	        }
	    }
	public void mousePressed(MouseEvent e) {
		xs=e.getX();
		ys=e.getY();
		System.out.println(xs+" "+ys);
	}
	public void mouseReleased(MouseEvent e) {
		 double tempxmin=xmin,tempymin=ymin,tempxmax=xmax,tempymax=ymax;
		xmin=tempxmin+xs*(tempxmax-tempxmin)/800.0;
		xmax=tempxmin+xe*(tempxmax-tempxmin)/800.0;
		ymin=tempymin+ys*(tempymax-tempymin)/560.0;
		ymax=ymin+(xmax-xmin)*560/800;
		System.out.println(xmin+" "+xmax+" "+ymin+" "+ymax);
		
		g1.setColor(Color.yellow);
		g1.drawRect(xs, ys, xe-xs, ye-ys);
		
		bk.setText("放大");
		flag=2;
		//repaint
	}
    public void mouseDragged(MouseEvent e)
    {
    	xe=e.getX();
    	ye=e.getY();

    }
	public void mouseClicked(MouseEvent e) {
		// TODO 自动生成方法存根
		
	}
	public void mouseEntered(MouseEvent e) {
		// TODO 自动生成方法存根
		
	}
	public void mouseExited(MouseEvent e) {
		// TODO 自动生成方法存根
		
	}
	public void mouseMoved(MouseEvent e) {
		// TODO 自动生成方法存根
		
	}
	public void actionPerformed(ActionEvent e){
		if(e.getSource()==ok) {
			repaint();
		 }
		else if(e.getSource()==bk){
			if(flag==1)
			{
				xmin=ymin=-1.5;
				xmax=ymax=1.5;
				zex=3/800;
				zey=3/560;
				repaint();
			}
			else if(flag==2){
				repaint();
				flag=1;
				bk.setText("取消");
			}
		}
	}
}