float x,y,x2,y2,xD,yD;
float dist,angle;

void setup() {
  size(400,400);
  x=random(width);
  y=random(height);
  x2=random(width);
  y2=random(height);
  ellipseMode(CENTER_DIAMETER);
}

void loop() {
  background(200,200,200);
  xD=x2-x;
  yD=y2-y;
  dist=sqrt(xD*xD+yD*yD);
  angle=degrees(atan2(yD,xD));

  x=x+xD/50;
  y=y+yD/50;
  
  x2=x2+random(-10,10);
  y2=y2+random(-10,10);

  fill(255,0,0);
//  ellipse(x2,y2, 10,10);
  
  fill(0,255,0);
  ellipse(x,y, 10,10);
  line(x,y, x2,y2);
}