if variable changes

How can I set up an event for if instance variable is added to, X happens?

system compare variable1 not equal to variable2:

set variable2 to variable1

do x

Burvey

There isn't a trigger for this that I've found. (That is, a reactive trigger that will happen whenever the variable changes anywhere. Personally, I want these too, but I can see why they aren't in the software).

I've been able to handle this in two ways:

1) Have two variables instead of one. The old value that only gets set in my checker and a "new value" everywhere else. I can compare to see if it got set Every Tick.

2) Or, I create a function that handles the what I want to do and call it everywhere I change the value.

Neither is truly reactive, but they work.

PixelHero

It doesn't make a big difference. Method number one would most probably be, what a trigger would also do behind the scenes. So it's as reactive as it can be <img src="smileys/smiley1.gif" border="0" align="middle" />

PixelHero

What I'm trying to do is change the bullet speed each time an enemy is hit. The way I have it now works which is the following:

If enemy hit is > 0 and <= 10 then set bullet speed to 100

If enemy hit is > 10 and <= 20 then set bullet speed to 110

If enemy hit is > 20 and <= 30 then set bullet speed to 120

etc...

It works but it takes a lot of events to do it and is a bit choppy. What I want to do is make it so that each time an enemy is hit, the bullet speed increases by 1. I tried using bullet.Bullet.Speed +1 along with the event that hit's an enemy, but it only works for the specific bullet. I need it to work with all bullets. Any ideas how I can get that to work correctly?

Thank you.

Would something like this work?

global number bspeed=100

bullet collides with enemy

pick all bullet

---> add 1 to speed

---> set bullet speed to bspeed

The "pick all" condition can be used so not just the bullet that collided is selected. "bspeed" is a global so when you create new bullets you can set there speed bspeed. Of course that's just an assumption, you could also just omit the global and use bullet.Bullet.Speed +1.

Or you could use:

bulletspeed = 100+floor(enemyhit/10)*10

R0J0hound

Using the global like that did work, but unfortunately for some reason it messed up another part of the game. I guess I'll just leave it as I have it. I just wish it didn't take me 30 events to make it work lol

Thanks everyone for your input.

Or you could use what I wrote.

mindfaQ

Just saw that, I'll give that a try.

EDIT:

After an hour or so of fiddling and changing my code I was able to get a variation of your code to work. Thank you for your help.