Star Wink In Function.

float starWidth = 130;
void setup () {
  size (260, 260);
}

void draw () {
  star_movement (starWidth);
  starWidth = starWidth + 1;

  if (starWidth >= width) {
    starWidth = 130;
  }
}

void star_movement (float starWidth) {
  background (255);
  strokeWeight (10);
  stroke (255, 0, 0);
  noFill ();
  triangle(0, starWidth+70, starWidth, 0, width, starWidth+70);
  triangle (0, starWidth-70, width, starWidth-70, starWidth, height);
}