private void MoveTowardsGoal()
{
if (this.X == this.goal.X && this.Y == this.goal.Y)
{
this.goal = map.FindEmptyPosition();
this.goalMap = this.CreateGoalMap();
}
var path = goalMap.FindPath(this.X, this.Y);
if (path != null)
{
var now = path.Steps.First();
var nextStep = path.Steps.Skip(1).FirstOrDefault();
if (nextStep != null && map.IsWalkable(nextStep.X, nextStep.Y))
{
this.Move(nextStep.X, nextStep.Y);
}
else
{
// Pick a new goal next time
this.goal = new Point(this.X, this.Y);
}
}
else
{
// No path to goal... Pick a new goal next time
this.goal = new Point(this.X, this.Y);
}
}
public Monster(ColourTuple colour, int agility, string visionType, int visionSize, CaveFloorMap map) : base('m', colour, true)
{
this.Agility = agility;
this.VisionType = visionType;
this.VisionSize = visionSize;
Monster.map = map;
this.goal = map.FindEmptyPosition();
this.goalMap = this.CreateGoalMap();
}
// We pick a goal, and move towards it, no matter what. Doing this every frame
// is really expensive and massively slows down the game. We can't have that.
// Instead, change your goal only when you're stuck -- path is blocked.
// Returns true if we attacked the player
public bool MoveWithAi(Player player)
{
switch (this.currentState)
{
case MonsterState.Wandering:
this.MoveTowardsGoal();
return(false);
case MonsterState.Hunting:
if (DistanceBetween(player.X, player.Y, this.X, this.Y) == 1)
{
player.Hurt();
return(true);
}
else
{
// Find an empty space around the player that we can pathfind to. If one exists.
var target = map.GetIMap().GetCellsInRadius(player.X, player.Y, 1).FirstOrDefault(c =>
{
// Make sure it's walkable, and it's not the player's spot (kills pathfinding)
// Also make sure it's closer to the player than where we are now
if (c.IsWalkable && (c.X != player.X || c.Y != player.Y) && DistanceBetween(player.X, player.Y, c.X, c.Y) <= DistanceBetween(player.X, player.Y, this.X, this.Y))
{
var map = CreateGoalMap();
map.AddGoal(c.X, c.Y, 100);
return(map.FindPaths(this.X, this.Y).Any());
}
else
{
return(false);
}
});
if (target != null)
{
this.goal = new Point(target.X, target.Y);
this.goalMap = this.CreateGoalMap();
}
else
{
if (this.DistanceBetween(this.X, this.Y, player.X, player.Y) > this.VisionSize)
{
this.currentState = MonsterState.Wandering;
this.goal = new Point(this.X, this.Y); // reset next round
}
}
this.MoveTowardsGoal();
}
return(false);
default:
throw new InvalidOperationException($"Not sure how to deal with state {this.currentState}");
}
}
