// has a rectangular window (visionW*visionH)
// walking range per frame is a circle with radius "range"
sclass G22Walker {
  int range; // how far we can walk in each frame
  double roundingPolicy = .9; // for making the range circle (between 0 and 1)
  int visionW, visionH; // window rectangle size (should be odd)
  Pt position; // current position (center), not null
  
  bool stuck; // can neither stay nor move anywhere for some reason
  int guessWork; // how many "optimal" new positions we chose from
  
  void move(BWImage image) {
    stuck = false;
    guessWork = 0;
    
    // How far can I move until I hit the image's borders
    Rect movement1 = rectFromPoints(visionW/2, visionH/2,
      image.getWidth()-(visionW+1)/2, (visionH+1)/2);
    
    // How far can I walk in one frame
    Rect movement2 = rectAroundPt(position, range*2+1);
    
    Rect movement = intersectRects(movement1, movement2);
    if (empty(movement)) ret with set stuck;
    
    printVars(+movement, +movement1, +movement2);
    
    Rect r = window_uncropped();
    
    new MultiBest<Pt> bestPositions;
    for (Pt newPos : allPointsInRect_virtual(movement))
      bestPositions.put(newPos, scorePosition(newPos));
    var best = bestPositions!;
    guessWork = l(best);
    position = random(best);
  }
  
  Rect window_uncropped(Pt center default position) {
    ret rectAroundPt(center, visionW, visionH);
  }
}