/// <summary>
/// Apply the action's item to the given target.
/// </summary>
/// <returns>True if there was any effect on the target.</returns>
private bool ApplyItem(Combatant itemTarget)
{
StatisticsValue effectStatistics = CalculateItemDamage(combatant, item);
if (item.IsOffensive)
{
// calculate the defense
Int32Range defenseRange = itemTarget.Character.MagicDefenseRange +
itemTarget.Statistics.MagicalDefense;
Int32 defense = defenseRange.GenerateValue(Session.Random);
// subtract the defense
effectStatistics -= new StatisticsValue(defense,
defense, defense, defense, defense, defense);
// make sure that this only contains damage
effectStatistics.ApplyMinimum(new StatisticsValue());
// damage the target
itemTarget.Damage(effectStatistics, item.TargetDuration);
}
else
{
// make sure taht this only contains healing
effectStatistics.ApplyMinimum(new StatisticsValue());
// heal the target
itemTarget.Heal(effectStatistics, item.TargetDuration);
}
return !effectStatistics.IsZero;
}
/// <summary>
/// Constructs a new CombatAction object.
/// </summary>
/// <param name="combatant">The combatant performing the action.</param>
public CombatAction(Combatant combatant)
{
// check the parameter
if (combatant == null)
{
throw new ArgumentNullException("combatant");
}
// assign the parameter
this.combatant = combatant;
Reset();
}
/// <summary>
/// Constructs a new SpellCombatAction object.
/// </summary>
/// <param name="character">The combatant performing the action.</param>
public SpellCombatAction(Combatant combatant, Spell spell)
: base(combatant)
{
// check the parameter
if (spell == null)
{
throw new ArgumentNullException("spell");
}
// assign the parameter
this.spell = spell;
this.adjacentTargets = this.spell.AdjacentTargets;
}
/// <summary>
/// Constructs a new ItemCombatAction object.
/// </summary>
/// <param name="character">The combatant performing the action.</param>
public ItemCombatAction(Combatant combatant, Item item)
: base(combatant)
{
// check the parameter
if (item == null)
{
throw new ArgumentNullException("item");
}
if ((item.Usage & Item.ItemUsage.Combat) == 0)
{
throw new ArgumentException("Combat items must have Combat usage.");
}
// assign the parameter
this.item = item;
this.adjacentTargets = this.item.AdjacentTargets;
}
/// <summary>
/// Set the primary and any secondary targets.
/// </summary>
/// <param name="primaryTarget">The desired primary target.</param>
/// <param name="adjacentTargets">
/// The number of simultaneous, adjacent targets affected by this spell.
/// </param>
private void SetTargets(Combatant primaryTarget, int adjacentTargets)
{
// set the primary target
this.primaryTargetedCombatant = primaryTarget;
// set any secondary targets
this.secondaryTargetedCombatants.Clear();
if ((primaryTarget != null) && (adjacentTargets > 0))
{
// find out which side is targeted
bool isPlayerTarget = primaryTarget is CombatantPlayer;
// find the index
int primaryTargetIndex = 0;
if (isPlayerTarget)
{
primaryTargetIndex = players.FindIndex(
delegate(CombatantPlayer player)
{
return (player == primaryTarget);
});
}
else
{
primaryTargetIndex = monsters.FindIndex(
delegate(CombatantMonster monster)
{
return (monster == primaryTarget);
});
}
// add the surrounding indices
for (int i = 1; i <= adjacentTargets; i++)
{
int leftIndex = primaryTargetIndex - i;
if (leftIndex >= 0)
{
secondaryTargetedCombatants.Add(
isPlayerTarget ? players[leftIndex] as Combatant :
monsters[leftIndex] as Combatant);
}
int rightIndex = primaryTargetIndex + i;
if (rightIndex < (isPlayerTarget ? players.Count : monsters.Count))
{
secondaryTargetedCombatants.Add(
isPlayerTarget ? players[rightIndex] as Combatant :
monsters[rightIndex] as Combatant);
}
}
}
}
/// <summary>
/// Starts a new combat stage. Called right after the stage changes.
/// </summary>
/// <remarks>The stage never changes into NotStarted.</remarks>
protected override void StartStage()
{
switch (stage)
{
case CombatActionStage.Preparing: // called from Start()
{
// play the animations
combatant.CombatSprite.PlayAnimation("SpellCast");
spellSpritePosition = Combatant.Position;
spell.SpellSprite.PlayAnimation("Creation");
// remove the magic points
Combatant.PayCostForSpell(spell);
}
break;
case CombatActionStage.Advancing:
{
// play the animations
spell.SpellSprite.PlayAnimation("Traveling");
// calculate the projectile destination
projectileDirection = Target.Position -
Combatant.OriginalPosition;
totalProjectileDistance = projectileDirection.Length();
projectileDirection.Normalize();
projectileDistanceCovered = 0f;
// determine if the projectile is flipped
if (Target.Position.X > Combatant.Position.X)
{
projectileSpriteEffect = SpriteEffects.FlipHorizontally;
}
else
{
projectileSpriteEffect = SpriteEffects.None;
}
}
break;
case CombatActionStage.Executing:
{
// play the animation
spell.SpellSprite.PlayAnimation("Impact");
// apply the spell effect to the primary target
bool damagedAnyone = ApplySpell(Target);
// apply the spell to the secondary targets
foreach (Combatant targetCombatant in
CombatEngine.SecondaryTargetedCombatants)
{
// skip dead or dying targets
if (targetCombatant.IsDeadOrDying)
{
continue;
}
// apply the spell
damagedAnyone |= ApplySpell(targetCombatant);
}
// play the impact sound effect
if (damagedAnyone)
{
AudioManager.PlayCue(spell.ImpactCueName);
if (spell.Overlay != null)
{
spell.Overlay.PlayAnimation(0);
spell.Overlay.ResetAnimation();
}
}
}
break;
case CombatActionStage.Returning:
// play the animation
combatant.CombatSprite.PlayAnimation("Idle");
break;
case CombatActionStage.Finishing:
// play the animation
combatant.CombatSprite.PlayAnimation("Idle");
break;
case CombatActionStage.Complete:
// play the animation
combatant.CombatSprite.PlayAnimation("Idle");
// make sure that the overlay has stopped
spell.Overlay.StopAnimation();
break;
}
}
/// <summary>
/// Constructs a new DefendCombatAction object.
/// </summary>
/// <param name="character">The character performing the action.</param>
public DefendCombatAction(Combatant combatant)
: base(combatant)
{
}
/// <summary>
/// Calculate the spell damage done by the given combatant and spell.
/// </summary>
public static StatisticsValue CalculateSpellDamage(Combatant combatant,
Spell spell)
{
// check the parameters
if (combatant == null)
{
throw new ArgumentNullException("combatant");
}
if (spell == null)
{
throw new ArgumentNullException("spell");
}
// get the magical offense from the character's class, gear, and bonuses
// -- note that this includes stat buffs
int magicalOffense = combatant.Statistics.MagicalOffense;
// add the magical offense to the spell
StatisticsValue damage =
spell.TargetEffectRange.GenerateValue(Session.Random);
damage.HealthPoints += (damage.HealthPoints != 0) ? magicalOffense : 0;
damage.MagicPoints += (damage.MagicPoints != 0) ? magicalOffense : 0;
damage.PhysicalOffense += (damage.PhysicalOffense != 0) ? magicalOffense : 0;
damage.PhysicalDefense += (damage.PhysicalDefense != 0) ? magicalOffense : 0;
damage.MagicalOffense += (damage.MagicalOffense != 0) ? magicalOffense : 0;
damage.MagicalDefense += (damage.MagicalDefense != 0) ? magicalOffense : 0;
// add in the spell damage
return damage;
}
/// <summary>
/// Constructs a new MeleeCombatAction object.
/// </summary>
/// <param name="character">The character performing the action.</param>
public MeleeCombatAction(Combatant combatant)
: base(combatant)
{
}
/// <summary>
/// Constructs a new MeleeCombatAction object.
/// </summary>
/// <param name="character">The character performing the action.</param>
public MeleeCombatAction(Combatant combatant)
: base(combatant)
{
}
/// <summary>
/// Calculate the item damage done by the given combatant and item.
/// </summary>
public static StatisticsValue CalculateItemDamage(Combatant combatant,
Item item)
{
// check the parameters
if (item == null)
{
throw new ArgumentNullException("item");
}
// generate a new effect value - no stats are involved for items
return item.TargetEffectRange.GenerateValue(Session.Random);
}
/// <summary>
/// Start the given player's combat turn.
/// </summary>
private void BeginPlayerTurn(CombatantPlayer player)
{
// check the parameter
if (player == null)
{
throw new ArgumentNullException("player");
}
// set the highlight sprite
highlightedCombatant = player;
primaryTargetedCombatant = null;
secondaryTargetedCombatants.Clear();
Session.Hud.ActionText = "Choose an Action";
}
/// <summary>
/// Update the combat engine for this frame.
/// </summary>
private void UpdateCombatEngine(GameTime gameTime)
{
// check for the end of combat
if (ArePlayersDefeated)
{
EndCombat(CombatEndingState.Loss);
return;
}
else if (AreMonstersDefeated)
{
EndCombat(CombatEndingState.Victory);
return;
}
// update the target selections
if ((highlightedCombatant != null) &&
(highlightedCombatant.CombatAction != null))
{
SetTargets(highlightedCombatant.CombatAction.Target,
highlightedCombatant.CombatAction.AdjacentTargets);
}
//update active battle timers
foreach (CombatantPlayer player in players)
{
if (player.AC > 5000 && player.readyForQueue)
{
player.AC = 5000;
//add player if hes not already there
if (!selectionQueue.Contains(player))
{
selectionQueue.Enqueue(player);
player.readyForQueue = false;
}
}
else if(!player.IsDeadOrDying)
player.AC += gameTime.ElapsedGameTime.Milliseconds;
}
foreach (CombatantMonster monster in monsters)
{
if (monster.AC > 4000 && monster.readyForQueue)
{
monster.AC = 4000;
//add player if hes not already there
if (!actionQueue.Contains(monster))
{
actionQueue.Enqueue(monster);
monster.readyForQueue = false;
}
}
else if(!monster.IsDeadOrDying)
monster.AC += gameTime.ElapsedGameTime.Milliseconds;
}
//show action menu if player's turn is ready
if (selectionQueue.Count > 0 && !selectionQueueLocked)
{
if (currentSelector == null)
{
isPlayersTurn = true;
currentSelector = selectionQueue.Peek();
currentSelector.IsTurnTaken = false;
BeginPlayerTurn((CombatantPlayer)selectionQueue.Peek());
selectionQueue.Dequeue();
selectionQueueLocked = true;
}
}
//resolve actions
bool removeAction = false;
//remove dead people in the front of the queue
while(actionQueue.Count > 0 && actionQueue.Peek().IsDeadOrDying)
actionQueue.Dequeue();
if (actionQueue.Count > 0 )
{
//unlock queue after current combatant finishes its action.
if(currentCombatant != null)
if(currentCombatant.CombatAction == null)
actionQueueLocked = false;
else if(currentCombatant.CombatAction.Stage == CombatAction.CombatActionStage.NotStarted)
actionQueueLocked = false;
if (actionQueue.Peek().GetType() == typeof(CombatantPlayer) && !actionQueueLocked)
{
//execute player action
actionQueue.Peek().CombatAction.Start();
currentCombatant = actionQueue.Peek();
removeAction = true;
}
if (actionQueue.Peek().GetType() == typeof(CombatantMonster) && !actionQueueLocked)
{
//execute monster action
BeginMonsterTurn((CombatantMonster)actionQueue.Peek() );
currentCombatant = actionQueue.Peek();
removeAction = true;
}
if (removeAction)
{
actionQueue.Dequeue();
actionQueueLocked = true;
}
}
// update the delay
UpdateDelay(gameTime.ElapsedGameTime.Milliseconds);
// UpdateDelay might cause combat to end due to a successful escape,
// which will set the singleton to null.
if (singleton == null)
{
return;
}
// update the players
foreach (CombatantPlayer player in players)
{
player.Update(gameTime);
}
// update the monsters
foreach (CombatantMonster monster in monsters)
{
monster.Update(gameTime);
}
// check for completion of the highlighted combatant
if ((delayType == DelayType.NoDelay) &&
(highlightedCombatant != null) && highlightedCombatant.IsTurnTaken)
{
delayType = DelayType.EndCharacterTurn;
}
// handle any player input
HandleInput();
}
/// <summary>
/// Handle player input that affects the combat engine.
/// </summary>
private void HandleInput()
{
// only accept input during the players' turn
// -- exit game, etc. is handled by GameplayScreen
if (!IsPlayersTurn || IsPlayersTurnComplete ||
(highlightedCombatant == null))
{
return;
}
#if DEBUG
// cheat key
if (InputManager.IsGamePadRightShoulderTriggered() ||
InputManager.IsKeyTriggered(Keys.W))
{
EndCombat(CombatEndingState.Victory);
return;
}
#endif
// handle input while choosing an action
if (highlightedCombatant.CombatAction != null)
{
// skip if its turn is over or the action is already going
if (highlightedCombatant.IsTurnTaken ||
(highlightedCombatant.CombatAction.Stage !=
CombatAction.CombatActionStage.NotStarted))
{
return;
}
// back out of the action
if (InputManager.IsActionTriggered(InputManager.Action.Back))
{
highlightedCombatant.CombatAction = null;
SetTargets(null, 0);
return;
}
// start the action
if (InputManager.IsActionTriggered(InputManager.Action.Ok))
{
actionQueue.Enqueue(highlightedCombatant);
currentSelector = null;
highlightedCombatant.IsTurnTaken = true;
highlightedCombatant = null;
primaryTargetedCombatant = null;
secondaryTargetedCombatants.Clear();
isPlayersTurn = false;
selectionQueueLocked = false;
return;
}
// go to the next target
if (InputManager.IsActionTriggered(InputManager.Action.TargetUp))
{
// cycle through monsters or party members
if (highlightedCombatant.CombatAction.IsOffensive)
{
// find the index of the current target
int newIndex = monsters.FindIndex(
delegate(CombatantMonster monster)
{
return (primaryTargetedCombatant == monster);
});
// find the next living target
do
{
newIndex = (newIndex + 1) % monsters.Count;
}
while (monsters[newIndex].IsDeadOrDying);
// set the new target
highlightedCombatant.CombatAction.Target = monsters[newIndex];
}
else
{
// find the index of the current target
int newIndex = players.FindIndex(
delegate(CombatantPlayer player)
{
return (primaryTargetedCombatant == player);
});
// find the next active, living target
do
{
newIndex = (newIndex + 1) % players.Count;
}
while (players[newIndex].IsDeadOrDying);
// set the new target
highlightedCombatant.CombatAction.Target = players[newIndex];
}
return;
}
// go to the previous target
else if (InputManager.IsActionTriggered(InputManager.Action.TargetDown))
{
// cycle through monsters or party members
if (highlightedCombatant.CombatAction.IsOffensive)
{
// find the index of the current target
int newIndex = monsters.FindIndex(
delegate(CombatantMonster monster)
{
return (primaryTargetedCombatant == monster);
});
// find the previous active, living target
do
{
newIndex--;
while (newIndex < 0)
{
newIndex += monsters.Count;
}
}
while (monsters[newIndex].IsDeadOrDying);
// set the new target
highlightedCombatant.CombatAction.Target = monsters[newIndex];
}
else
{
// find the index of the current target
int newIndex = players.FindIndex(
delegate(CombatantPlayer player)
{
return (primaryTargetedCombatant == player);
});
// find the previous living target
do
{
newIndex--;
while (newIndex < 0)
{
newIndex += players.Count;
}
}
while (players[newIndex].IsDeadOrDying);
// set the new target
highlightedCombatant.CombatAction.Target = players[newIndex];
}
return;
}
}
else // choosing which character will act
{
// move to the previous living character
if (InputManager.IsActionTriggered(
InputManager.Action.ActiveCharacterLeft))
{
int newHighlightedPlayer = highlightedPlayer;
do
{
newHighlightedPlayer--;
while (newHighlightedPlayer < 0)
{
newHighlightedPlayer += players.Count;
}
}
while (players[newHighlightedPlayer].IsDeadOrDying ||
players[newHighlightedPlayer].IsTurnTaken);
if (newHighlightedPlayer != highlightedPlayer)
{
highlightedPlayer = newHighlightedPlayer;
BeginPlayerTurn(players[highlightedPlayer]);
}
return;
}
// move to the next living character
else if (InputManager.IsActionTriggered(
InputManager.Action.ActiveCharacterRight))
{
int newHighlightedPlayer = highlightedPlayer;
do
{
newHighlightedPlayer =
(newHighlightedPlayer + 1) % players.Count;
}
while (players[newHighlightedPlayer].IsDeadOrDying ||
players[newHighlightedPlayer].IsTurnTaken);
if (newHighlightedPlayer != highlightedPlayer)
{
highlightedPlayer = newHighlightedPlayer;
BeginPlayerTurn(players[highlightedPlayer]);
}
return;
}
Session.Hud.UpdateActionsMenu();
}
}
/// <summary>
/// Start the given player's combat turn.
/// </summary>
private void BeginMonsterTurn(CombatantMonster monster)
{
// if it's null, find a random living monster who has yet to take their turn
if (monster == null)
{
// don't bother if all monsters have finished
if (IsMonstersTurnComplete)
{
return;
}
// pick random living monsters who haven't taken their turn
do
{
monster = monsters[Session.Random.Next(monsters.Count)];
}
while (monster.IsTurnTaken || monster.IsDeadOrDying);
}
// set the highlight sprite
highlightedCombatant = monster;
primaryTargetedCombatant = null;
secondaryTargetedCombatants.Clear();
// choose the action immediate
monster.CombatAction = monster.ArtificialIntelligence.ChooseAction();
}
/// <summary>
/// Constructs a new DefendCombatAction object.
/// </summary>
/// <param name="character">The character performing the action.</param>
public DefendCombatAction(Combatant combatant)
: base(combatant)
{
}