import java.applet.Applet;
import java.awt.event.*;
import java.awt.*;


public class test1 extends Applet {
    MotionCanvas M;
    ControlCanvas C;
    Animator A;

    public void init() {
	setBackground(Color.blue);
	M=new MotionCanvas();
	C=new ControlCanvas();
	A=new Animator();
	M.setBackground(Color.black);
	C.setBackground(new Color(50,50,150));
	C=C.addMotionCanvas(M);
	C=C.addAnimator(A);
	M=M.addAnimator(A);
	A=A.addMotionCanvas(M);
	M.setSize(300,300);
	C.setSize(155,300);
	add(C);
	add(M);
        try {A.start();} catch(Exception e) {}
    }
}

 

/*

class DBCanvas extends Canvas {
    
    public void update(Graphics g) {
        Graphics g2;
        Image offscreen = null;
        offscreen = createImage(size().width, size().height);
        g2 = offscreen.getGraphics();
        paint(g2);
        g.drawImage(offscreen, 0, 0, this);
	g2.dispose();
	offscreen.flush();
    }
}

*/






   

class MotionCanvas extends DBCanvas implements MouseListener,MouseMotionListener {
    ListenSquare[][] Q=new ListenSquare[30][30];
    Particle[] P=new Particle[6];
    Animator A;
    int count;

    MotionCanvas() {
	addMouseListener(this);
	addMouseMotionListener(this);

	P[1]=new Particle(265.0,265.0,4.0,Color.red);
	P[1].I=26;
	P[1].J=26;

	P[2]=new Particle(45.0,45.0,4.0,Color.blue);
	P[2].I=4;
	P[2].J=4;

	P[3]=new Particle(45.0,265.0,4.0,Color.green.darker());
	P[3].I=4;
	P[3].J=26;


	P[4]=new Particle(265.0,45.0,4.0,Color.yellow );
	P[4].I=26;
	P[4].J=4;

	count=4;

	double ii,jj;
	for(int i=0;i<30;++i) {
	    for(int j=0;j<30;++j) {
		ii=i;
		jj=j;
		ii=10*ii+5.0;
		jj=10*jj+5.0;
		Q[i][j]=new ListenSquare(ii,jj,5.0,0,Color.white);
	    }
	}
    }

    MotionCanvas addAnimator(Animator A) {
	MotionCanvas Y=this;
        Y.A=A;
	return(Y);
    }

    public void paint(Graphics g) {
	for(int i=1;i<=28;++i) {
	    for(int j=1;j<=28;++j) {
		Q[i][j].render(g);
	    }
	}
	for(int i=1;i<=count;++i) P[i].render(g);
    }




    public void mouseMoved(MouseEvent e) {}
    public void mouseReleased(MouseEvent e) {}
    public void mousePressed(MouseEvent e) {}
    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}

    public void mouseDragged(MouseEvent e) {
	e.consume();
	Point p=new Point();
	ListenSquare QQ;
	p.x=e.getX();
	p.y=e.getY();
	p.x=(p.x/10);
	p.y=(p.y/10);
	if((p.x>0)&&(p.x<29)&&(p.y>0)&&(p.y<29)) {
	    QQ=Q[p.x][p.y];
	    if((QQ.history==0)&&(QQ.on!=30)) {
		   QQ.on=1-QQ.on;
		   QQ.history=1;   
                   QQ.n=Q[p.x][p.y-1].on;
                   QQ.e=Q[p.x+1][p.y].on;
                   QQ.w=Q[p.x-1][p.y].on;
                   QQ.s=Q[p.x][p.y+1].on;  
                   QQ.s=Q[p.x][p.y+1].on;
	           Q[p.x-1][p.y].e=1-Q[p.x-1][p.y].e;
                   Q[p.x+1][p.y].w=1-Q[p.x+1][p.y].w;
	           Q[p.x][p.y-1].s=1-Q[p.x][p.y-1].s;
                   Q[p.x][p.y+1].n=1-Q[p.x][p.y+1].n;
                   Q[p.x-1][p.y].history=0;
                   Q[p.x+1][p.y].history=0;
	           Q[p.x][p.y-1].history=0;
                   Q[p.x][p.y+1].history=0;
	           repaint();
		   Q[p.x][p.y]=QQ;
	    }
	}
    }


       

    public void mouseClicked(MouseEvent e) {
	e.consume();
	Point p=new Point();
	ListenSquare QQ;
	p.x=e.getX();
	p.y=e.getY();
	p.x=(p.x/10);
	p.y=(p.y/10);
        if((p.x>0)&&(p.x<29)&&(p.y>0)&&(p.y<29)) {
	    QQ=Q[p.x][p.y];
	    QQ.on=1-QQ.on;
	    QQ.n=Q[p.x][p.y-1].on;
            QQ.e=Q[p.x+1][p.y].on;
            QQ.w=Q[p.x-1][p.y].on;
            QQ.s=Q[p.x][p.y+1].on;
	    Q[p.x-1][p.y].e=1-Q[p.x-1][p.y].e;
            Q[p.x+1][p.y].w=1-Q[p.x+1][p.y].w;
	    Q[p.x][p.y-1].s=1-Q[p.x][p.y-1].s;
            Q[p.x][p.y+1].n=1-Q[p.x][p.y+1].n;
	    Q[p.x][p.y]=QQ;
            repaint();
	}
    }


    void reset () {
	for(int i=0;i<=29;++i) {
	    for(int j=0;j<=29;++j) {
		Q[i][j].on=0;
		Q[i][j].n=0;
		Q[i][j].s=0;
		Q[i][j].e=0;
		Q[i][j].w=0;
		Q[i][j].C=Color.white;
	    }

	P[1]=new Particle(265.0,265.0,4.0,Color.red);
	P[1].I=26;
	P[1].J=26;

	P[2]=new Particle(45.0,45.0,4.0,Color.blue);
	P[2].I=4;
	P[2].J=4;

	P[3]=new Particle(45.0,265.0,4.0,Color.green.darker());
	P[3].I=4;
	P[3].J=26;


	P[4]=new Particle(265.0,45.0,4.0,Color.yellow );
	P[4].I=26;
	P[4].J=4;


	}
    }

    void recolor (Color C) {
	for(int i=1;i<=28;++i) {
	    for(int j=1;j<=28;++j) {
		Q[i][j].C=C;
	    }
	}
    }


}
















class VSlider {
    int x,y,w,h;
    int pos;
    Color[] C;
    String S;
    VSlider(int x,int y,int w,int h,int pos,Color[] C,String S) {
	this.x=x;
	this.y=y;
	this.h=h;
	this.w=w;
	this.pos=pos;
	this.C=C;
	this.S=S; 
    }

    void render(Graphics g) {
	g.setColor(C[1]);
	g.fillRect(x,y,w,h);
	g.setColor(C[2]);
        g.drawRect(x,y,w,h);
	g.setColor(C[3]);
	g.drawRect(x+1,pos-1,w-2,2); 
        g.setColor(C[2]);    
        g.setFont(new Font("Helvetica",Font.PLAIN,11));
	g.drawString(S,x,y+h+12);
    }

    int inside(Point p) {
	int test=0;
	if((p.x>x)&&(p.x<x+w)&&(p.y>y)&&(p.y<y+h)) test=1;
	return(test);
    }

    void redo(ControlCanvas C) {
	C.repaint(x,y,w,h);
    }

}












class ControlCanvas extends Canvas implements MouseListener {
    Animator A;
    MotionCanvas M;
    VSlider V;
    ListenSquare[] J=new ListenSquare[25];

    ControlCanvas() {
	addMouseListener(this);
	Color C[]=new Color[4];
	C[1]=Color.black;
	C[2]=Color.white;
	C[3]=Color.red;
	V=new VSlider(3,10,22,170,100,C,"speed");

	J[1]=new ListenSquare(70,20,5,1,Color.red);
	J[2]=new ListenSquare(80,20,5,1,Color.blue);
	J[3]=new ListenSquare(90,20,5,1,Color.yellow);
        J[4]=new ListenSquare(100,20,5,1,Color.green.darker());
	J[5]=new ListenSquare(60,20,5,1,Color.white);
        J[6]=new ListenSquare(50,20,5,1,Color.magenta);

        J[7]=new ListenSquare(130,20,10,1,Color.black);

    }

    public void paint(Graphics g) {
	V.render(g);
        g.setColor(Color.white);  
        g.setFont(new Font("Helvetica",Font.PLAIN,25));
        g.drawString("Rich:",60,110);
        g.drawString("Applet 24",30,140);
        g.setFont(new Font("Helvetica",Font.PLAIN,11));
	g.drawString("Click/drag the mouse to",10,240);
        g.drawString("draw/erase blocks.  The dots",10,257);
        g.drawString("go around the drawn blocks",10,274);
        g.drawString("and paint them as they go.",10,291);
        g.drawString("reset",120,45);
	g.drawString("reset color",45,45);

	g.setColor(Color.black);
	g.fillRect(37,10,76,20);
        g.setColor(Color.white);
        g.drawRect(37,10,76,20);

	for(int i=1;i<=7;++i)	J[i].render(g);
        g.drawRect(170,170,20,20);
        g.setColor(Color.white);
	g.drawRect(120,10,20,20);



    }

    ControlCanvas addMotionCanvas(MotionCanvas M) {
	ControlCanvas B=this;
	B.M=M;
	return(B);
    }

    ControlCanvas addAnimator(Animator A) {
	ControlCanvas B=this;
	B.A=A;
	return(B);
    }


    public void mouseReleased(MouseEvent e) {}
    public void mousePressed(MouseEvent e) {}
    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}
    public void mouseClicked(MouseEvent e) {
	e.consume();
	Point p=new Point();
	p.x=e.getX();
	p.y=e.getY(); 
	if(V.inside(p)==1) {
          A.speed=(long)(p.y/2.0);
          V.redo(this);
	  V.pos=p.y;
	}
	for(int j=1;j<=6;++j) {
	if(J[j].inside(p)==1) {M.recolor(J[j].C);M.repaint();}
	}
	if (J[7].inside(p)==1) {M.reset();M.repaint();}
    }


}












class ListenSquare {
    double x,y,r;
    int on,history,pos,emit,n,e,w,s;
    Color C;
    ListenSquare(double x,double y,double r,int on,Color C) {
	this.x=x;
	this.y=y;
	this.C=C;
	this.r=r;
	this.on=on;
	this.history=0;
	this.pos=0;
	this.emit=0;
	this.n=0;
	this.e=0;
	this.w=0;
	this.s=0;
    }

    void render(Graphics g) {
	if(on==1) {
	    g.setColor(C);
	    g.fillRect((int)(x-r),(int)(y-r),(int)(2*r),(int)(2*r));
	}

	if(on==0) {
	    g.setColor(new Color(0,0,150));
            g.drawRect((int)(x-r),(int)(y-r),(int)(2*r),(int)(2*r));
	}
    }

    int inside(Point p) {
        int test=0;
	if((p.x>x-r)&&(p.x<x+r)&&(p.y>y-r)&&(p.y<y+r)) test=1;
	return(test);
    }

}




















class Particle {

    double x,y,r;
    Color C;
    int I,J;
    int d;

    Particle(double x,double y,double r,Color C) {
	this.x=x;
	this.y=y;
	this.C=C;
	this.r=r;
	I=0;
	J=0;
	d=1;
    }


    void render(Graphics g) {
	    g.setColor(C);
	    g.fillOval((int)(x-r),(int)(y-r),(int)(2*r),(int)(2*r));  
            g.drawOval((int)(x-r),(int)(y-r),(int)(2*r),(int)(2*r));
    }


    Particle update(ListenSquare[][] Q,Animator A) {
      Particle P=this;
     
      ListenSquare QQ;
      int dirr=0;
      int dir=P.d;
      int i,j;
      i=P.I;
      j=P.J;
      QQ=Q[i][j];
     

      int empty=0;
      if((dir==1)&&(QQ.n==1)) empty=1;
      if((dir==2)&&(QQ.e==1)) empty=1;
      if((dir==3)&&(QQ.s==1)) empty=1;
      if((dir==4)&&(QQ.w==1)) empty=1;

      if(empty==0) {
          if(dir==1) {P.J=j-1;P.y=P.y-10;}
          if(dir==2) {P.I=i+1;P.x=P.x+10;}
          if(dir==3) {P.J=j+1;P.y=P.y+10;}
          if(dir==4) {P.I=i-1;P.x=P.x-10;}
	  dirr=dir-1;
	  if(dirr==0) dirr=4;
      }

     
      int count=0;
      if(dirr==0) { 
      if(P.d==1) {

      if((count==0)&&(QQ.e==0)) {dir=1;count=1;P.I=P.I+1;P.x=P.x+10;}
      if((count==0)&&(QQ.s==0)) {dir=2;count=2;P.J=P.J+1;P.y=P.y+10;}
      if((count==0)&&(QQ.w==0)) {dir=3;count=3;P.I=P.I-1;P.x=P.x-10;}
      if((count==0)&&(QQ.n==0)) {dir=4;count=4;P.J=P.J-1;P.y=P.y-10;}
      }
      
      if(P.d==2) {
      if((count==0)&&(QQ.s==0)) {dir=2;count=1;P.J=P.J+1;P.y=P.y+10;}
      if((count==0)&&(QQ.w==0)) {dir=3;count=2;P.I=P.I-1;P.x=P.x-10;}
      if((count==0)&&(QQ.n==0)) {dir=4;count=3;P.J=P.J-1;P.y=P.y-10;}
      if((count==0)&&(QQ.e==0)) {dir=1;count=4;P.I=P.I+1;P.x=P.x+10;}
      }

      if(P.d==3) {
      if((count==0)&&(QQ.w==0)) {dir=3;count=1;P.I=P.I-1;P.x=P.x-10;}
      if((count==0)&&(QQ.n==0)) {dir=4;count=2;P.J=P.J-1;P.y=P.y-10;}
      if((count==0)&&(QQ.e==0)) {dir=1;count=3;P.I=P.I+1;P.x=P.x+10;}
      if((count==0)&&(QQ.s==0)) {dir=2;count=4;P.J=P.J+1;P.y=P.y+10;}
      }

      if(P.d==4) {
      if((count==0)&&(QQ.n==0)) {dir=4;count=1;P.J=P.J-1;P.y=P.y-10;}
      if((count==0)&&(QQ.e==0)) {dir=1;count=2;P.I=P.I+1;P.x=P.x+10;}
      if((count==0)&&(QQ.s==0)) {dir=2;count=3;P.J=P.J+1;P.y=P.y+10;}
      if((count==0)&&(QQ.w==0)) {dir=3;count=4;P.I=P.I-1;P.x=P.x-10;}
      }}


      if(empty!=0) {
      if(dir==1) Q[P.I-1][P.J-1].C=P.C;
      if(dir==2) Q[P.I+1][P.J-1].C=P.C;
      if(dir==3) Q[P.I+1][P.J+1].C=P.C;
      if(dir==4) Q[P.I-1][P.J+1].C=P.C;

      if(count>=2) {
      if(dir==1) Q[P.I-2][P.J].C=P.C;
      if(dir==2) Q[P.I][P.J-2].C=P.C;
      if(dir==3) Q[P.I+2][P.J].C=P.C;
      if(dir==4) Q[P.I][P.J+2].C=P.C;
      }

      if(count==3) {
      if(dir==1) Q[P.I-1][P.J+1].C=P.C;
      if(dir==2) Q[P.I-1][P.J-1].C=P.C;
      if(dir==3) Q[P.I+1][P.J-1].C=P.C;
      if(dir==4) Q[P.I+1][P.J+1].C=P.C;


      }


      }
      P.d=dir;
      if(dirr>0) P.d=dirr;
      return(P); 
    }



}

















class Animator extends Thread {
    MotionCanvas M;
    long speed;

    public void run() {
	speed=50;
	while(true) {
	    for(int j=1;j<=M.count;++j) {
		M.P[j]=M.P[j].update(M.Q,this); }
            M.repaint();
            try {sleep(2*speed);} catch(Exception e) {}
	}
    }

    Animator addMotionCanvas(MotionCanvas M) {
	Animator B=this;
	B.M=M;
	return(B);
    }
}