GameMaker knockback in platform game

[TiuZero]

I'm trying to create a knockback system in a platform game, I'm using this

other.hspd = knockBackhspd * sign(other.x-x);
other.vspd = -knockBackvspd

but he only throws the player up, I wanted him to play left and right, I tried to change and add some things, but nothing works, what can I do? can you help me? or if you know of an alternative method please tell me.

 

[samspade]

We would need to see your code to say for sure, but if I had to guess I would say that you have something like the following in your player's step event:

hspd = (right - left) * spd;

Or really just something which says hspd = something else. As soon as you set hspd like that you are wiping any prior information it might have had, resetting hspd each step.

There are two basic solutions. The first would be to switch over to a acceleration system (which is what is most people use for vspd). The second is to add knockback to its own variable which you manage separately form hspd and add to hspd each step.

hspd = (right - left) * spd;
hspd += knockback;

 

[FrostyCat]

You should also make sure that code is in a genuine collision event. place_meeting() and other similar collision-checking functions in a Step event don't count, and needs different handling.

 

[TiuZero]

We would need to see your code to say for sure, but if I had to guess I would say that you have something like the following in your player's step event:

hspd = (right - left) * spd;

Or really just something which says hspd = something else. As soon as you set hspd like that you are wiping any prior information it might have had, resetting hspd each step.

There are two basic solutions. The first would be to switch over to a acceleration system (which is what is most people use for vspd). The second is to add knockback to its own variable which you manage separately form hspd and add to hspd each step.

hspd = (right - left) * spd;
hspd += knockback;

man, you got it right my step event, how would i do the knockback? in
what events do i have to post? and in what? player or enemy?
I'm sorry, I'm a layman