Examples of channeling spells

Weep said:

Nope, just do your destroy/cleanup on a trigger with that event and the condition that it is the correct ability.

You should save the data so that it's retrievable with only the information about the casting unit...after all, a unit can't be channeling the same spell more than once at a time, so it's OK to attach the spell data to the caster. That's one reason I like making channeled spells; it's so easy, especially if you're using a unit indexing system.

emjlr3's spell is a little different because he lets you re-target it by casting it again, while maintaining the same duration. Plain channeled spells like Aerial Shackles or Starfall just have a distinct start, end, and the spell effects that happen meanwhile.

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it just so happens that successional casts trigger just about every PLAYER_UNIT_SPELL_XXXX there is

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to my suprise learning an ability fires a unit event, and each ability has a unique learn id

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emjlr3 said:

I discovered that learning an ability produces a unique orderid, specific to that ability.

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WaterKnight said:

Yes and that order id is equal to the ability's id. Normal cast orders lie in the 852k area. The raw ids of objects from object editor (learning abilities, training/building/upgrading to units, researching, selling items) are much higher.

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shiFt said:

This is what I wrote

JASS:

 library CHANNEL requires T32

    globals
        private constant integer SPELL_ID = 'A09R'
        private integer i
    endglobals
    
    private struct Data
        unit cs
        real x
        real y
        integer tick
        
        private method onDestroy takes nothing returns nothing
            set .cs = null
            set i = 0
            call .deallocate()
        endmethod
        
        static method Conditions takes nothing returns boolean
            if GetTriggerEventId() == EVENT_PLAYER_UNIT_SPELL_EFFECT and GetSpellAbilityId()==SPELL_ID then
                set i = 1
                call BJDebugMsg( "ok0")
                return true
            elseif GetTriggerEventId() == EVENT_PLAYER_UNIT_SPELL_ENDCAST then
                set i = 2
                call BJDebugMsg( "ok1")
                return true
            endif
            return false
        endmethod  
        
        private method periodic takes nothing returns nothing
            if .tick >= T32_Tick and i == 1 then
                call DestroyEffect(AddSpecialEffect("Abilities\\Spells\\Human\\Thunderclap\\ThunderClapCaster.mdl", .x,.y))
                call BJDebugMsg( "ok3")
                if .tick == T32_Tick or i == 2 then
                    call .stopPeriodic()
                    call .destroy()
                endif
            endif
        endmethod
        implement T32x
        
        private static method act takes nothing returns boolean
            local thistype this = thistype.allocate()
            set .cs = GetTriggerUnit()
            set .x = GetUnitX(.cs)
            set .y = GetUnitY(.cs)
            set .tick = T32_Tick + R2I( 10. * T32_PERIOD)

            call BJDebugMsg( I2S(i))
            if i == 1 then
                call .startPeriodic()
            endif
            
            if i == 2 then
                call .stopPeriodic()
                call .destroy()
            endif

            return false
        endmethod
        
        private static method onInit takes nothing returns nothing
            local trigger t = CreateTrigger()
            local integer i = 0
            loop
                exitwhen i > 11
                call TriggerRegisterPlayerUnitEvent(t, Player(i), EVENT_PLAYER_UNIT_SPELL_EFFECT, null)
                call TriggerRegisterPlayerUnitEvent(t, Player(i), EVENT_PLAYER_UNIT_SPELL_ENDCAST, null)
                set i = i + 1
            endloop
            call TriggerAddCondition( t, Condition( function thistype.Conditions ) )
            call TriggerAddAction(t, function thistype.act)
        endmethod
    endstruct
endlibrary

Fires "ok1"
And "1"
Then crashes game

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