public override IEnumerable <IMove> ValidMovesFor(MapCellLocation location, HeroState owner, HeroState target, MapState map)
{
// can the target move to the cell we're on?
if (map.CanMoveTo(target, location, out MapCellState currentCell))
{
yield break;
}
// if the target can move to my position, I need to be able to move
// in the same direction to the next cell
var(dr, dc) = MapCellLocation.Diff(location, target.Location);
(int r, int c) = location;
if (map.CanMoveTo(owner, (r + dr, c + dc), out MapCellState desiredCell))
{
var moveTargetBack = new MoveHeroTo(target, 1, currentCell, map);
var moveMeBack = new MoveHeroTo(owner, 1, desiredCell, map);
yield return(new AggregateMove(moveMeBack, moveTargetBack));
}
}
public override IEnumerable <IMove> ValidMovesFor(MapCellLocation location, HeroState owner, HeroState target, MapState map)
{
// can the owner move to the target's position?
if (!map.CanMoveTo(owner, target.Location, out MapCellState targetCell))
{
yield break;
}
// can the target move to the owner's position?
if (!map.CanMoveTo(target, location, out MapCellState ownerCell))
{
yield break;
}
// the swap can be done!
var moveOwnerToTarget = new MoveHeroTo(owner, 1, targetCell, map);
var moveTargetToOwner = new MoveHeroTo(target, 1, ownerCell, map);
yield return(new AggregateMove(moveOwnerToTarget, moveTargetToOwner));
}
public override IEnumerable <IMove> ValidMovesFor(MapCellLocation location, HeroState owner, HeroState target, MapState map)
{
var potentialPlaces = map.Neighbors(location, 1);
foreach (var(cell, depth, distance) in potentialPlaces)
{
if (map.CanMoveTo(target, cell))
{
// we can reposition the target to this spot
yield return(new MoveHeroTo(target, 1, cell, map));
}
}
}
public override IEnumerable <IMove> ValidMovesFor(MapCellLocation location, HeroState owner, HeroState target, MapState map)
{
var(dr, dc) = MapCellLocation.Diff(target.Location, location);
(int r, int c) = target.Location;
dr = Math.Sign(dr);
dc = Math.Sign(dc);
// can we push the target 1 space away?
if (map.CanMoveTo(target, (r + dr, c + dc), out MapCellState cell))
{
yield return(new MoveHeroTo(target, 1, cell, map, true));
}
}
public override IEnumerable <IMove> ValidMovesFor(MapCellLocation location, HeroState owner, HeroState target, MapState map)
{
var(dr, dc) = MapCellLocation.Diff(target.Location, location);
(int r, int c) = target.Location;
dr = Math.Sign(dr);
dc = Math.Sign(dc);
// can we push the target 2 spaces away?
var distance = 2;
if (!map.CanMoveTo(target, (r + dr + dr, c + dc + dc), out MapCellState cell))
{
// no? Can we push them one square away?
distance = 1;
if (!map.CanMoveTo(target, (r + dr, c + dc), out cell))
{
yield break;
}
}
// we can push the target 2/1 squares away
yield return(new MoveHeroTo(target, distance, cell, map, true));
}