Package net.demilich.metastone.game.spells

Class ModifyDamageSpell

java.lang.Object

net.demilich.metastone.game.spells.Spell

net.demilich.metastone.game.spells.ModifyDamageSpell

All Implemented Interfaces:

Serializable, HasDesc<SpellDesc>

public class ModifyDamageSpell
extends Spell

Modifies the amount of damage that is currently about to be dealt.

The expression for the modification is DAMAGE OPERATION VALUE. In other words, if SpellArg.OPERATION is AlgebraicOperation.ADD, the damage is 2 and the value is 4, the new damage will be 2 + 4 = 6.

Several triggers cast their spells at the right moment to modify damage. For example, a common trigger is a PreDamageTrigger, for text like "Your minions can only take 1 damage at a time":

   {
      "eventTrigger": {
        "class": "PreDamageTrigger",
        "fireCondition": {
          "class": "OwnedByPlayerCondition",
          "targetPlayer": "SELF"
        },
        "targetEntityType": "MINION",
        "targetPlayer": "SELF"
      },
      "spell": {
        "class": "ModifyDamageSpell",
        "value": 1,
        "operation": "SET"
      }
   }
 

Or, for example, the FatalDamageTrigger is useful for text like "When your hero takes fatal damage, heal for the amount instead.":

   {
     "eventTrigger": {
       "class": "FatalDamageTrigger",
       "sourcePlayer": "BOTH",
       "targetEntityType": "HERO",
       "targetPlayer": "SELF"
     },
     "spell": {
       "class": "MetaSpell",
       "spells": [
         {
           "class": "ModifyDamageSpell",
           "value": 0,
           "operation": "SET"
         },
         {
           "class": "HealSpell",
           "target": "FRIENDLY_HERO",
           "value": {
             "class": "EventValueProvider"
           }
         }
       ]
     }
   }
 

Finally, to double damage dealt by this minion to heroes:

   {
     "eventTrigger": {
       "class": "PreDamageTrigger",
       "hostTargetType": "IGNORE_OTHER_SOURCES",
       "targetEntityType": "HERO"
     },
     "spell": {
       "class": "ModifyDamageSpell",
       "value": 2,
       "operation": "MULTIPLY"
     }
   }
 

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
ModifyDamageSpell()

Method Summary

Modifier and Type	Method	Description
static SpellDesc	create(int value, AlgebraicOperation operation)
protected void	onCast(GameContext context, Player player, SpellDesc desc, Entity source, Entity target)	Implementations of onCast are the meat-and-bones of a spell's effects.

Methods inherited from class net.demilich.metastone.game.spells.Spell

cast, castForPlayer, checkArguments, getDesc, isNativeStateful, setDesc, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

ModifyDamageSpell

public ModifyDamageSpell()

Method Details

create

public static SpellDesc create(int value,
 AlgebraicOperation operation)

onCast

protected void onCast(GameContext context,
 Player player,
 SpellDesc desc,
 Entity source,
 Entity target)

Description copied from class: Spell

Implementations of onCast are the meat-and-bones of a spell's effects. This should actually call a variety of methods in GameLogic, generate cards using SpellUtils.getCards(GameContext, Player, Entity, Entity, SpellDesc), interpret SpellArg keys in the desc, etc.

Observe that subclasses of Spell mostly just need to implement this function. Also, observe that instances of Spell are stateless: all the state is provided as arguments to this function.

Specified by:

onCast in class Spell

Parameters:

context - The game context

player - The casting player

desc - The collection of SpellArg keys and values that are interpreted by the implementation of this function to actually cause effects in a game

source - The entity from which this effect is happening (typically a card or a minion if it's a battlecry).

target - The particular target of this invocation of the spell. When a spell hits multiple targets, like an AoE damage effect, this method is called once for each target in the list of targets.

See Also:

• for an example of a complex spell implementation.