import java.applet.*;import java.awt.*;import java.awt.event.*;public class R extends Applet implements MouseMotionListener {int r[][]=new int[200][6],m[]=new int[6],W;public void init(){W=getSize().width;addMouseMotionListener(this);}public void mouseDragged(MouseEvent e){Point p=e.getPoint();int[]t=r[199];t[0]=p.x;t[1]=p.y;System.arraycopy(r,0,r,1,200-1);r[0]=t;}public void mouseMoved(MouseEvent e){}public void update (Graphics h){paint(h);}public void paint(Graphics g){Image I=createImage(W,W);Graphics G=I.getGraphics();for(int i=200;--i>=0;) {int[]l=r[i];G.setColor(new Color(l[3],l[4],l[5]));int x=l[0],y=l[1],D=W/8,R=D/2;G.fillOval(x-R,y-R,D,D);G.fillOval(W-x-R,W-y-R,D,D);G.fillOval(W-x-R,y-R,D,D);G.fillOval(x-R,W-y-R,D,D);}g.drawImage(I,0,0,this);for (int i=200;--i>0;)  System.arraycopy(r[i-1],3,r[i],3,3);int l[]=r[0],t;for (int i=3;i<6;++i){t=l[i];double f=(Math.random()*256)-t;int d=(m[i]+=(f>0)?1:-1);t+=(d>0?5:-5);l[i]=(t<0)?0:(t>255)?255:t;}repaint();}}