// dir 方向へ(なるべく)前進する Loc を返す。
// (前方、斜め前方、側面方向の Loc を返す)
public Loc[] Forwards5(Dir front)
{
return(new[] {
Forward(front),
Forward(front.Clockwise()),
Forward(front.Anticlockwise()),
Forward(front.Clockwise().Clockwise()),
Forward(front.Anticlockwise().Anticlockwise()),
});
}
// 前進する場合の移動先の候補を返す。進めない場合は後退する。
private static Loc[] Advance(Loc fm, Dir dir)
{
var locs = new[] {
fm.Forward(dir),
fm.Forward(dir.Clockwise()),
fm.Forward(dir.Anticlockwise()),
fm.Forward(dir.Clockwise().Clockwise()),
fm.Forward(dir.Anticlockwise().Anticlockwise()),
fm.Backward(dir),
};
return(locs);
}
// 斜め方向
public Loc[] ForwardsDiagonally(Dir front)
{
return(new[] {
Forward(front.Clockwise()),
Forward(front.Anticlockwise()),
});
}
// to に近づく
private static Loc[] Approach(Loc fm, Loc to)
{
Dir dir = fm.Toward(to);
var locs = new[] {
fm.Forward(dir),
fm.Forward(dir.Clockwise()),
fm.Forward(dir.Anticlockwise()),
fm.Forward(dir.Clockwise().Clockwise()),
fm.Forward(dir.Anticlockwise().Anticlockwise()),
};
Array.Sort(locs, (a, b) => {
var x = a.SquareDistance(to);
var y = b.SquareDistance(to);
return(x.CompareTo(y));
});
return(locs);
}
public Loc Left(Dir front)
{
return(Forward(front.Anticlockwise().Anticlockwise()));
}
