/* ========= PATHFINDING METHODS ========= */
/// <summary>
/// Return a list of possible moves for the player
/// </summary>
/// <param name="world">World the player is currently located in</param>
/// <param name="location">Location the player is currently at</param>
/// <param name="allowUnsafe">Allow possible but unsafe locations</param>
/// <returns>A list of new locations the player can move to</returns>
public static IEnumerable <Location> GetAvailableMoves(World world, Location location, bool allowUnsafe = false)
{
List <Location> availableMoves = new List <Location>();
if (IsOnGround(world, location) || IsSwimming(world, location))
{
foreach (Direction dir in Enum.GetValues(typeof(Direction)))
{
if (CanMove(world, location, dir) && (allowUnsafe || IsSafe(world, location.Move(dir))))
{
availableMoves.Add(location.Move(dir));
}
}
}
else
{
foreach (Direction dir in new [] { Direction.East, Direction.West, Direction.North, Direction.South })
{
if (CanMove(world, location, dir) && IsOnGround(world, location.Move(dir)) && (allowUnsafe || IsSafe(world, location.Move(dir))))
{
availableMoves.Add(location.Move(dir));
}
}
availableMoves.Add(location.Move(Direction.Down));
}
return(availableMoves);
}
/* ========= SIMPLE MOVEMENTS ========= */
/// <summary>
/// Check if the player can move in the specified direction
/// </summary>
/// <param name="world">World the player is currently located in</param>
/// <param name="location">Location the player is currently at</param>
/// <param name="direction">Direction the player is moving to</param>
/// <returns>True if the player can move in the specified direction</returns>
public static bool CanMove(World world, Location location, Direction direction)
{
switch (direction)
{
case Direction.Down:
return(!IsOnGround(world, location));
case Direction.Up:
return((IsOnGround(world, location) || IsSwimming(world, location)) &&
!world.GetBlock(location.Move(Direction.Up, 2)).Type.IsSolid());
case Direction.East:
case Direction.West:
case Direction.South:
case Direction.North:
return(!world.GetBlock(location.Move(direction)).Type.IsSolid() &&
!world.GetBlock(location.Move(direction).Move(Direction.Up)).Type.IsSolid());
default:
throw new ArgumentException("Unknown direction", "direction");
}
}
/// <summary>
/// Check if the specified location is safe
/// </summary>
/// <param name="world">World for performing check</param>
/// <param name="location">Location to check</param>
/// <returns>True if the destination location won't directly harm the player</returns>
public static bool IsSafe(World world, Location location)
{
return
//No block that can harm the player
(!world.GetBlock(location).Type.CanHarmPlayers() &&
!world.GetBlock(location.Move(Direction.Up)).Type.CanHarmPlayers() &&
!world.GetBlock(location.Move(Direction.Down)).Type.CanHarmPlayers()
//No fall from a too high place
&& (world.GetBlock(location.Move(Direction.Down)).Type.IsSolid() ||
world.GetBlock(location.Move(Direction.Down, 2)).Type.IsSolid() ||
world.GetBlock(location.Move(Direction.Down, 3)).Type.IsSolid())
//Not an underwater location
&& !(world.GetBlock(location.Move(Direction.Up)).Type.IsLiquid()));
}
/* ========= LOCATION PROPERTIES ========= */
/// <summary>
/// Check if the specified location is on the ground
/// </summary>
/// <param name="world">World for performing check</param>
/// <param name="location">Location to check</param>
/// <returns>True if the specified location is on the ground</returns>
public static bool IsOnGround(World world, Location location)
{
return(world.GetBlock(location.Move(Direction.Down)).Type.IsSolid() &&
(location.Y <= Math.Truncate(location.Y) + 0.0001));
}