Wiley-World.of.Warcraft.Programming.A.Guide.and.Reference.for.Creating.WoW.Addons

Chapter 21 ■ Responding to the Combat Log and Threat Information 389Combat Event PrefixThe event prefix indicates the type of the event, such as whether it involvesphysical damage like an auto-attack, a ranged attack, spell, or damage toa building or structure in-game. The additional arguments will be after theinitial eight arguments that come with the COMBAT_LOG_EVENT_UNFILTERED.SWING—This prefix is encountered for any auto-attack damage. No additionalarguments are sent for this type of event prefix.RANGE—Any ranged attacks, such as auto shot, shoot bow/gun/crossbow/wand, and throwing, will use this prefix, which sends the spellinformation as additional arguments. The spell information is passed inadditional arguments: spellId, spellName,andspellSchool.SPELL—This prefix is used for all spellcast events, as well as other types ofnon-periodic spell actions. The spell information is passed in additionalarguments: spellId, spellName,andspellSchool.ENVIRONMENTAL—This prefix is used for damage caused by the environment,such as when a player touches a bonfire, is immersed in lava, fallsfrom great height, or begins to drown. The type of environmental damageis passed as an additional argument: environmentType.Bit Fields and Spell SchoolsThroughout the combat log, bit fields are used for arguments where more thanone setting might be set in a single argument. The term bit field comes from thebinary representation of numbers, where a number is made up of a numberof bits. Table 21-1 shows the basic spell schools with their numeric values andbinary representation.Table 21-1: Spell Schools and Numeric RepresentationsSPELL SCHOOL NUMERIC VALUE BINARY REPRESENTATIONPhysical 1 00000001Holy 2 00000010Fire 4 00000100Nature 8 00001000Frost 16 00010000Shadow 32 00100000Arcane 64 01000000Frostfire 20 00010100