Snippet Shield

Dirac

22710180
Reaction score
147
JASS:
library Shield /* v1.0.6

*/uses/*
*/  DamageMod   /* thehelper.net/forums/showthread.php/168144-Damage-Struct

A useful tool to prevent damage done to units.

**********************************************************************/
globals
//*********************************************************************
//  The priority sets before and after which damage mods the shield
//  prevents damage.
    constant integer SHIELD_PRIORITY    =4
endglobals
/**********************************************************************
*
*   function GetShieldUnit takes nothing returns unit
*       -   The unit whose shield just expired.
*   function GetShieldUnitId takes nothing returns unit
*       -   The unit's custom value
*
***********************************************************************
*
*   struct Shield
*
*       -   Shields the unit.
*       -   Takes the unit's custom value as an instance.
*
*       real amount
*           -   The amount of damage to be shielded for the unit
*       readonly static DamageMod MOD
*           -   The mod used for this code.
*       method onExpire takes code func returns nothing
*           -   Runs the function when the shield expires for the unit
*       method end takes nothing returns nothing
*           -   Expires the shield
*
*********************************************************************/

    globals
        private unit    ShieldUnit
        private integer ShieldUnitId
    endglobals
    
    private module ShieldModule
        readonly static DamageMod   MOD
        private         trigger     trig
                        real        amount
        
        method onExpire takes code func returns nothing
            if null==this.trig then
                set this.trig=CreateTrigger()
            else
                call TriggerClearConditions(this.trig)
            endif
            call TriggerAddCondition(this.trig,Filter(func))
        endmethod
        
        method end takes nothing returns nothing
            set this.amount=0
            set ShieldUnitId=this
            static if LIBRARY_UnitIndexer then
                set ShieldUnit=GetUnitById(this)
            else
                set ShieldUnit=GetIndexUnit(this)
            endif
            call TriggerEvaluate(this.trig)
            call TriggerClearConditions(this.trig)
        endmethod
        
        private static method onDamage takes nothing returns boolean
            local thistype this=Damage.targetId
            if 0>=this.amount then
                return false
            endif
            set this.amount=this.amount-Damage.prevent(this.amount)
            if this.amount<=0 then
                set ShieldUnit=Damage.target
                set ShieldUnitId=Damage.targetId
                call TriggerEvaluate(this.trig)
                call TriggerClearConditions(this.trig)
            endif
            return false
        endmethod
        
        private static method onInit takes nothing returns nothing
            set MOD=DamageMod.create(function thistype.onDamage,SHIELD_PRIORITY)
        endmethod
        
    endmodule
    
    struct Shield extends array
        implement ShieldModule
    endstruct
    
    function GetShieldUnit takes nothing returns unit
        return ShieldUnit
    endfunction
    
    function GetShieldUnitId takes nothing returns integer
        return ShieldUnitId
    endfunction
endlibrary
 

Dirac

22710180
Reaction score
147
v1.02
-Added the onExpire method
-Added the GetShieldUnit function
-Fixed the mod priority
 
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