float x = 0.0;
void setup() {
  size(300,300);
}
void draw() {
  background(255);
  smooth();
  x +=0.6;
  fill(210);
  rect(x,140,70,17);
  quad(x,140,x+14,135,x+56,135,x+70,140);
  line(x+35,120,x+35,135);
  noFill();
  quad(x+14,135,x+22,120,x+48,120,x+56,135);
  ellipse(x+15, 157, 17, 17);
  ellipse(x+55, 157, 17, 17);
  fill(0);
  ellipse(x+15, 157, 6, 6);
  ellipse(x+55, 157, 6, 6);
  if(x>300) {
    x=0;
  }
}