/// <summary>
/// Get targets at the given position and return a targeting context
/// with all extra information. The pattern will be rotated by
/// the attack direction in order to produce correct targeted positions.
/// If the attacker is null, the attack us considered anonymous.
/// TODO:
/// The targeted layer should be passed as a parameter.
/// Having the block layer be defined on the provider is fine.
/// </summary>
public AttackTargetingContext GetTargets(
Entity attacker, Layers targetLayer, IntVector2 attackerPosition, IntVector2 attackDirection)
{
var context = new AttackTargetingContext(
targetContexts: _pattern.MakeContexts(attackerPosition, attackDirection).ToList(),
pattern: _pattern,
targetedLayer: targetLayer,
blockLayer: _blockLayer
);
_map(context);
return(context);
}
/// <summary>
/// Leaves the first target context in the given targeting contexts for which the entity
/// can be attacked. The targeting context will be emptied if there are no such entities.
/// </summary>
public static void SingleSimpleMap(AttackTargetingContext context)
{
var first = context.targetContexts.Where(
c => _IsAttackableTarget_AndSetTransformAndAttackness(c, context.targetedLayer, context.blockLayer)).FirstOrDefault();
if (first != null)
{
context.targetContexts[0] = first;
context.targetContexts.RemoveRange(1, context.targetContexts.Count - 1);
}
else
{
context.targetContexts.Clear();
}
}
/// <summary>
/// This map should be used by most weapons that make use of pattern's features.
/// This map should be used if your weapon may target more than 1 entity at a time.
/// </summary>
public static void MultiDefaultMap(AttackTargetingContext context)
{
SetTargetEntitiesAndBlocks(context.targetContexts, context.targetedLayer, context.blockLayer);
context.targetContexts = context.targetContexts.Where(_IsAttackableOrBlock).ToList();
if (context.targetContexts.Count == 0)
{
return;
}
context.targetContexts =
DiscardUnreachable(context.targetContexts, context.pattern)
.Where(c => !_IsBlock(c, context.blockLayer))
.ToList();
if (context.targetContexts.Count == 0)
{
return;
}
context.targetContexts = TakeAll_ThatCanBeAttacked_ByDefault(context.targetContexts);
}
