How do i make a "Spring" actor?

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Basically, i want to make sort of a spring actor. When picked up, it would launch the player in the air. How do i do that?

[Empyre]

This should help: https://zdoom.org/wiki/A_ChangeVelocity

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37 minutes ago, Empyre said:

https://zdoom.org/wiki/A_ChangeVelocity

 

Won't it change velocity of itself?

[Empyre]

No.  Since it would then be an item in the player's inventory, it would thrust the player.

 

As an example, here is the alt-fire of a weapon I made, which makes the player fly.  It calls A_ChangeVelicity twice, once to stop the player from falling if he is, then again to thrust him upwards.

	AltFire:
		NECR BC 3
		TNT1 A 0 A_JumpIf(velz >= 0, "NotFalling")
		TNT1 A 0 A_ChangeVelocity(velx,vely,0,CVF_REPLACE)
		//pass through
	NotFalling:
		NECR D 7 A_ChangeVelocity(0,0,20)
		NECR C 3
		NECR B 3
		NECR A 3 A_ReFire
		Goto Ready

 

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4 minutes ago, Empyre said:

No.  Since it would then be an item in the player's inventory, it would thrust the player.

 

Ok, so it will work with inventory.autoactivate, right?