int x=0;
int y=0;
int zx=1;
int zy=1;
int lx=1;
int ly=1;
int lx2=1;
int ly2=1;
int xx=1;
int xy=1;
int xx2=1;
int xy2=1;
int a=1;
int b=1;
int a1=1;
int a2=1;


void setup() {
  size(400,400);
  background(0,0,0);
  ellipseMode(CENTER_DIAMETER);
}

void loop() {
  background(255,255,255);
  fill(200,0,0);
  
  line(lx,ly,lx2,ly2);
  lx=80;
  ly=2+ly;
  lx2=80;
  ly2=ly+80;
  if (ly>height) {
    ly=-80;
    ly2=0;
    }
    
    
  line(xx,xy,xx2,xy2);
  xx=2+xx;
  xy=80;
  xx2=xx2+80;
  xy2=80;
  if (xx>width) {
    xx=-80;
    xx2=0;
    }

  line(a,b,0,0);
  a=a+2;
  b=b+2;
 if (a>width) a=0;
 if (b>height) b=0;
  
  ellipse(x,y, 20,20);
  x=x+2*zx;
  y=y+3*zy;
  if(x>width)  zx=-1;
  else if(x<0) zx=1;
   
  
  if(y>height) zy=-1;
  else if(y<0) zy=1;
}