Introduce powerups at certain intervals in game

Hi all,more help required if possible please.

I am doing a basic shooting game and I have introduced a power up when the players score has reached a certain score for example when the player score has reached 100 a powerup will move onto the screen at a random position along the x axis and drop off the bottom of the screen. How can I achieve this again when the players score reaches another value , say 500 or something like that , and keep creating it as the score increases at different intervals.

Thanks in advance.

You could use two separate variables. One for the score itself, and one that increases equally with the score and works as a counter.

Actually follow the counter for the sake of the power up, and when the power up is spawned reset the counter variable to 0.

Do you want it to be a linear (i.e. every 100 points), exponential (i.e 100, 200, 400, 800 points, etc...) increase between power ups or do you want to use a list of values that you personally are picking arbitrary?

The Mod operator is your friend here...That's the '%' symbol.

Linear:

System -> Compare Variable Score > 0

System -> Compare Variable Score % 100 = 0

-- System -> Trigger Once While True

-- (Spawn your power up)

Exponential is a little more tricky:

Global Variable -> PowerUp = 1

System -> Compare Value Score > 0

System -> Compare Value Score %(PowerUp*100) = 0

-- System -> Trigger Once While True

-- System Add to PowerUp 1

-- (Spawn your power up)

And picking from a list is even more tricky if you aren't use to arrays.. You'll need an array object (we'll call it PowerUpArray):

System -> On Layout Start

--PowerUpArray Push Back 100 on X axis

--PowerUpArray Push Back 300 on X axis

--PowerUpArray Push Back 900 on X axis

--(Repeat until all are in the array

PowerUpArray -> Contains Score

-- System -> Trigger Once While True

-- (Spawn your power up)