[Spell] Push Ability

[RobertMKD]

Can someone help me with an ability that pushes all units (possibly only enemy units) away from the casting unit to a determined distance..?

 

[measer]

well you need a trigger spell for that, that does something in a loop like:
for each from x to y move unit instantly offset from the casting unit.
dont have the WE open atm cant remeber the complete syntax, but i m sure the next poster does =D

 

[RobertMKD]

Hmm, isn't there a more simple way? Like - is Barathrum's Charge of Darkness spell from DotA also made like you said?

 

[measer]

the charge i think works like a buff that gives barathrum 0 collsion/flying movement and increased movespeed till the buff is removen (which happens when u do something else)

the greater bash ability (and over pushing/pulling spells like vacuum, foce staff, blackhol etc) are build like described, at least i have not heard something else yet.

 

[LordDz]

http://www.hiveworkshop.com/forums/spells.php?search=knockback&d=list&r=20

 

[BloodDrunk]

You should use Knockback system. Like the name says, it knocks back enemy units.
When do you want it to occur?
I could make it, but is it spell or what?

 

[RobertMKD]

I want all of the units around the hero to be pushed away from him, it occurs when i activate it, when the units get pushed away the spell ends and they can get near him again..

 

[BloodDrunk]

So it's a spell.
How long will the knockback effect last and how far will the units be knockbacked?

 

[RobertMKD]

• TelePush
  • Events
    • Unit - A unit Starts the effect of an ability
  • Conditions
    • (Ability being cast) Equal to Telekinetic Push
  • Actions
    • Set TelePushCaster = (Casting unit)
    • Set TelePushCasterPosition = (Position of TelePushCaster)
    • Set TelePushUnitsAffected = (Units within 700.00 of TelePushCasterPosition matching ((Owner of (Matching unit)) Not equal to (Owner of TelePushCaster)))
    • For each (Integer A) from 1 to 20, do (Actions)
      • Loop - Actions
        • Unit Group - Pick every unit in TelePushUnitsAffected and do (Actions)
          • Loop - Actions
            • Unit - Move (Picked unit) instantly to (TelePushCasterPosition offset by (5.00, 5.00))

what do i type for X and Y ?

 

[Elprede]

No need to worry about having values for x and y. You technically already using x and y values when using a point. Instead, use point with polar offset to determine the direction and speed at which the targets will move in 20 steps.

 

[Dr Super Good]

The push back is implemented with a periodic timer/trigger that fires between 0.04 and 0.0166 seconds which moves affected units a certain displacement based on the intended velocity. If you do not want the unit's current orders to be interrupted during the knockback you will need to use the JASS only native SetUnitX and SetUnitY as all GUI movement actions issue an implicit stop order.

Since you want the units to stop once they are exactly a certain distance away from the caster you will need additional logic. The most efficient way is to pre-compute the number of ticks the unit needs to be moved for it to end at that distance (simple speed*time stuff you are used to from physics at school). A less efficient but more dynamic away (support other factors affecting unit movement) is to check the distance between unit and caster each tick and if it is larger than the intended amount you then end the effect on the unit.

To manage effects consider some form of instancing system, were each instance of knockback is given a unique index in an array using an indexing system (usually a free list). In this case it could also be possible to use a stack based instancing system (add to top, remove by pulling top and replacing current etc) as each instance is stand alone so instance movement in the array is of no concern.

If using GUI do remember that locations created for the movement calculations will leak unless you use JASS only natives to clean them (RemoveLocation).

 

[RobertMKD]

• TelePush
  • Events
    • Unit - A unit Starts the effect of an ability
  • Conditions
    • (Ability being cast) Equal to Telekinetic Push
  • Actions
    • Set TelePushCaster = (Casting unit)
    • Set TelePushCasterPosition = (Position of TelePushCaster)
    • Set TelePushUnitsAffected = (Units within 700.00 of TelePushCasterPosition matching ((Owner of (Matching unit)) Not equal to (Owner of TelePushCaster)))
    • For each (Integer A) from 1 to 20, do (Actions)
      • Loop - Actions
        • Set TelePushStoreDistance = (TelePushStoreDistance - 35.00)
        • Unit Group - Pick every unit in TelePushUnitsAffected and do (Actions)
          • Loop - Actions
            • Unit - Move (Picked unit) instantly to (TelePushCasterPosition offset by TelePushStoreDistance towards 0.00 degrees)
            • Destructible - Pick every destructible within 100.00 of (Position of (Picked unit)) and do (Destructible - Kill (Picked destructible))
            • Custom script: call RemoveLocation (udg_TelePushCasterPosition)
        • Game - Display to (All players) the text: (String(TelePushStoreDistance))
        • Wait 0.01 game-time seconds
    • Set TelePushStoreDistance = 0.00

i'm stuck, when i use the spell, all of the units around the caster move to the center of the map, i really don't know how does this offset thing works.... please help me..

 

[Wietlol]

Move the RemoveLocation() to the bottom.
Just before you move the unit, you must create a new location variable (with the polar offset)
Then move the unit to that location and check for the destructables and immediately after that, you remove that location.
Also... you might want to set the distance at the start of the trigger.

 

[RobertMKD]

can you show me a trigger? cause i did not understand a thing

 

[Wietlol]

• TelePush
  • Events
    • Unit - A unit Starts the effect of an ability
  • Conditions
    • (Ability being cast) Equal to Telekinetic Push
  • Actions
    • Set TelePushCaster = (Casting unit)
    • Set TelePushCasterPosition = (Position of TelePushCaster)
    • Set TelePushStoreDistance = 100?????
    • Set TelePushUnitsAffected = (Units within 700.00 of TelePushCasterPosition matching ((Owner of (Matching unit)) Not equal to (Owner of TelePushCaster)))
    • For each (Integer A) from 1 to 20, do (Actions)
      • Loop - Actions
        • Set TelePushStoreDistance = (TelePushStoreDistance - 35.00)
        • Unit Group - Pick every unit in TelePushUnitsAffected and do (Actions)
          • Loop - Actions
            • Set TempLocation = (TelePushCasterPosition offset by TelePushStoreDistance towards 0.00 degrees)
            • Unit - Move (Picked unit) instantly to TempLocation
            • Destructible - Pick every destructible within 100.00 of TempLocation and do (Destructible - Kill (Picked destructible))
            • Custom script: call RemoveLocation(udg_TempLocation)
        • Game - Display to (All players) the text: (String(TelePushStoreDistance))
        • Wait 0.01 game-time seconds
    • Custom script: call RemoveLocation(udg_TelePushCasterPosition)
    • Set TelePushStoreDistance = 0.00

 

[Dr Super Good]

Wait 0.01 game-time seconds

Actually is...
Wait 0.10 or worse game-time seconds

TriggerSleepAction is very unreliable with its timing but it at best 0.1 seconds. In multiplayer it is usually a lot worse. This is why you need periodic triggers or timers.