private static Message ChaseTarget(Tile target, Tile chaser)
{
// The chaser will try to go in the directions that is closest to the player.
// TODO: diff is a bad name but I can't think of a better on
var diff = chaser.Location.NormalizedVector(target.Location);
// diff suggests either go vertically or horizontally. Which is better?
var verticalMove = chaser.Location + new Point(0, diff.Y);
var horizontalMove = chaser.Location + new Point(diff.X, 0);
if ( GetVectorLengthPointPoint(verticalMove, target.Location) < GetVectorLengthPointPoint(horizontalMove, target.Location) )
{
// TODO: should this check for a collision on this move? If there is collision should monster try the horizontal move?
return chaser.BuildMoveMessage(verticalMove);
}
if (GetVectorLengthPointPoint(horizontalMove, target.Location) < GetVectorLengthPointPoint(verticalMove, target.Location) )
{
// TODO: should this check for a collision on this move? If there is collision should monster try the vertical move?
return chaser.BuildMoveMessage(horizontalMove);
}
// if either is as good then, y is preferable to x
// TODO: Make this better, it's pretty atbitrary.
var direction = diff.Y != 0 ? new Point(0, diff.Y) : new Point(diff.X, 0);
return chaser.BuildMoveMessage(chaser.Location + direction);
}
private static Message ChaseTarget(Tile target, Tile chaser, TileSet statics)
{
var movementVector = chaser.Location.NormalizedVector(target.Location);
var bestMove = new[]{
chaser.Location + new Point(0, movementVector.Y), //vertical
chaser.Location + new Point(movementVector.X, 0)} //horizontal
.OrderBy(m => m.Distance(target.Location)) // order on distance from player
.FirstOrDefault(m => !statics.CollisionDetection(chaser, m).Collision); //pick first where there is no collision
return bestMove != default(Point)
? chaser.BuildMoveMessage(bestMove)
: null;
}
private Message MovePlayer(Tile player, ControllerMessage message)
{
if (player.IsActive)
{
var destination = InputMap.Transform(message.Body, player.Location, 1);
return player.BuildMoveMessage(destination);
}
return null;
}