class Shape
{
  Position[] points;
  
  Shape() {}
  
  void set(Position[] p, int index, float ix, float iy)
  {
    points = new Position[p.length - index + 1];
    int j = 1;
    points[0] = new Position(ix, iy);
    for (int i = index; i < p.length-1; i++) {
      points[j] = new Position(p[i]);
      j++;
    }
    
  }
  
  void be()
  {
    if (points != null) {
      draw();
    }
  }
  
  void draw()
  {
    stroke(255);
    fill(255, 192, 192, 128);
    beginShape(POLYGON);
    curveVertex(points[0].x, points[0].y);
    for (int i = 0; i < points.length; i++) {
      if (points[i] != null && points[i].on_screen()) {
        curveVertex(points[i].x, points[i].y);
      }
    }
    curveVertex(points[0].x, points[0].y);
    endShape();
    
    fill(0,0,255);
    for (int i = 0; i < points.length; i++) {
      if (points[i] != null && points[i].on_screen()) {
        rect(points[i].x, points[i].y, 5, 5);
      }
    }
    fill(0,255,0);
    rect(points[0].x, points[0].y, 5, 5);
  }
}