fractal.java

Java编写的分形程序

/*作者:连惠城
 Keep my name anytime please!
请保留作者名字
*/
import java.awt.*;
import java.applet.*;
import java.awt.event.*;


class FractalCanvas extends Canvas
{
     String str="Julia";//default str="Julia"

     public FractalCanvas()
     {
          this.setBackground(Color.blue);
     }

     public void repaint(String s) {

         if (s=="Julia"){
            str="Julia";

          }

         if (s=="Mandelbrot") {
            str="Mandelbrot";
         }

         repaint();
     }
     ////////////
     ///////////
     public void paint(Graphics g) {
          /////////////////
          ///begin of julis
          if( str=="Julia")
          {
		int a=350;
                int b=350;
                double p=-0.12;
                double q=0.74;
                //double p=-0.1;
                //double q=0.69;
                int M=100;

                int K=255;

                double xMin=-1.5;
                double yMin=-1.5;
                double xMax=1.5;
                double yMax=1.5;

               double deltaX=(xMax-xMin)/(a-1);
               double deltaY=(yMax-yMin)/(b-1);


		for(int i=0;i<a;i++)
                  for( int j=0;j<b;j++)
                  {
                     double x0=xMin+i*deltaX;
                     double y0=yMin+j*deltaY;

                     int k=0;
                     int color=0;

                     //int cr=0;
                    // int cg=0;
                     //int cb=0;
                     double tempX;
                     double tempY;
                     double r;

                     for(k=1;k<K;k++)
                     {
                        tempX=x0;
                        tempY=y0;


                        x0=tempX*tempX-tempY*tempY+p;
                        y0=2*tempX*tempY+q;

                      //  k=k+1;
                        r=x0*x0+y0*y0;

                        if(r>M){
                         color=(k)*250*250*250;//128*128;
                         // cr=k&15;//11111111=255
                         // cg=k&240;//1111111100000000=65280
                         // cb=k&3840;//&16711680;//1111111100000000=16711680
                         break;
                         }

                        //if(r<=M){
                        // continue;
                        //}

                      }


                    //int ratio=400/16;//=256
                    g.setColor(new Color(color));

                    if(k==K){
                       g.setColor(Color.darkGray);
                     }

                    g.drawLine(i,j,i,j);


                  }//end for

              }//end of julia
              ////////////////

          /////////////////
          ///begin of Mandelbrot
          if( str=="Mandelbrot")
          {
		int a=350;
                int b=350;

                double pMin=-2.25;
                double qMin=-1.5;
                double pMax=0.75;
                double qMax=1.5;

                int M=100;

                int K=255;

                double xMin=-1.5;
                double yMin=-1.5;
                double xMax=1.5;
                double yMax=1.5;

                double deltaP,deltaQ;

                deltaP=(pMax-pMin)/(a-1);
                deltaQ=(qMax-qMin)/(b-1);


		for(int i=0;i<a;i++)
                  for( int j=0;j<b;j++)
                  {
                     double p0=pMin+i*deltaP;
                     double q0=qMin+j*deltaQ;

                     double x0=0;
                     double y0=0;

                     int k=0;
                     int color=0;

                     //int cr=0;
                    // int cg=0;
                     //int cb=0;
                     double tempX;
                     double tempY;
                     double r;

                     for(k=1;k<K;k++)
                     {
                        tempX=x0;
                        tempY=y0;


                        x0=tempX*tempX-tempY*tempY+p0;
                        y0=2*tempX*tempY+q0;
                      //  k=k+1;
                        r=x0*x0+y0*y0;

                        if(r>M){
                         color=(k)*250*250*25;
                         break;
                         }

                        //if(r<=M){
                        // continue;
                        //}

                      }


                    //int ratio=400/16;//=256
                    g.setColor(new Color(color));

                    if(k==K){
                       g.setColor(Color.darkGray);
                     }

                    g.drawLine(i,j,i,j);


                  }//end for

              }//end of Mandelbrot
              ////////////////


       //////////////////////
       ////////////////////

	}//end of paint

}

/**\\\\\\\\\\\\
*\\\\\\\\\\\\\\\\
*\\\\\\\\\\\\\\\\\
*/

public class Fractal extends Applet
{
	ControlPanel controlPanel;
	FractalCanvas fractalCanvas;
       // StrPanel strPanel;


	public void init()
	{
	   setLayout(new BorderLayout());


           fractalCanvas=new FractalCanvas();
	   controlPanel=new ControlPanel(fractalCanvas);
          // strPanel=new StrPanel();

           add("South",controlPanel);
          // add("North",strPanel);
	   add("Center",fractalCanvas);


	}


}


/**\\\\\\\\\\\\
*\\\\\\\\\\\\\\\\
*\\\\\\\\\\\\\\\\\
*/

/*
class StrPanel extends Panel {
 public StrPanel(){
    add(new Label("制作：连惠城  时间：2002.4.26",1));
 }
}
*/
/**\\\\\\\\\\\\
*\\\\\\\\\\\\\\\\
*\\\\\\\\\\\\\\\\\
*/
class ControlPanel extends Panel implements ActionListener
{

     Button btnJulia;
     Button btnMandelbrot;
     FractalCanvas fractalCanvas;

     public  ControlPanel(FractalCanvas fractalCanvas)
     {
      this.setBackground(new Color(90000));
      this.fractalCanvas=fractalCanvas;

   //   setLayout(new GridLayout(1,4,10,3));
      
      add(new Label("         "));//null
      
      btnJulia = new Button("Julia");
      add(btnJulia);
      btnJulia.addActionListener(this);

      btnMandelbrot = new Button("Mandelbrot");
      add(btnMandelbrot);
      btnMandelbrot.addActionListener(this);

      

      Label label=new Label("制作：连惠城 02/4/26 ");
      label.setForeground(Color.yellow);
      label.setFont(new Font("",0,12));
      add(label);

      //setLayout(new BorderLayout());




     }



   public void actionPerformed(ActionEvent ev)
   {
        String label=ev.getActionCommand();


        if(label.equals("Julia"))
        {
            fractalCanvas.repaint("Julia");
        }

        if(label.equals("Mandelbrot"))
        {
            fractalCanvas.repaint("Mandelbrot");
        }


   }

}