public void Move(Direction direction, bool eat)
{
Point nextPoint;
var mod = ApplicationSettings.MatrixSize - 1;
switch (direction)
{
case Direction.Up:
var y = (Head.Y - 1) % mod;
if (y < 0)
{
y = mod;
}
nextPoint = new Point(Head.X, y);
break;
case Direction.Right:
nextPoint = new Point((Head.X + 1) % mod, Head.Y);
break;
case Direction.Down:
nextPoint = new Point(Head.X, (Head.Y + 1) % mod);
break;
case Direction.Left:
var x = (Head.X - 1) % mod;
if (x < 0)
{
x = mod;
}
nextPoint = new Point(x, Head.Y);
break;
default:
throw new ArgumentOutOfRangeException(nameof(direction), direction, null);
}
if (State[nextPoint.X, nextPoint.Y])
{
throw new GameOverException("Invalid coordinate");
}
State[nextPoint.X, nextPoint.Y] = true;
if (direction != CurrentDirection)
{
Joints.Insert(0, new Joint(Head, direction));
}
if (!eat)
{
var count = Joints.Count;
var end = Joints[count - 1];
State[end.Point.X, end.Point.Y] = false;
switch (end.Direction)
{
case Direction.Up:
end.Point.Y--;
break;
case Direction.Right:
end.Point.X++;
break;
case Direction.Down:
end.Point.Y++;
break;
case Direction.Left:
end.Point.X--;
break;
default:
throw new ArgumentOutOfRangeException(nameof(direction), direction, null);
}
if (count > 2 && Joints[count - 2].Point.Equals(end.Point))
{
Joints.Remove(end);
}
}
Head = nextPoint;
}