sin: up or down

wouter

hi guys,

how can i check if the attribute is moving up or down (using a sinus on an attribute..)??
i can create a Boolean up thats true or false but how can i check if the attribute is going up (or not)....

wouter

MarkOnTheIron

Check the actor linear speed X or Y (depending on the orientation) if it's positive is going up and if it's negative is going down.

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RH

Off the top of my head, you could create another two attributes (say called test and up/down).

Make a rule that when your attribute > self.test:

change attribute self.up/down to 1 & change attribute self.test to your attribute

OTHERWISE

when attribute your attribute < self.test:

change attribute self.up/down to 2 & change attribute self.test to your attribute

This means that when self.up/down is 1 your attribute will be increasing and when it is 2 your attribute will be decreasing.

Haven't tested this and the effectiveness may vary depending on how fast your attribute is changing.

wouter

ok thanks, will check this out;)

wouter

oh and with the linear speed y (in this case), can i check also the direction? (because i must make an animation of the attribute and not only up or down;) (must be smooth)

@RH
and this can't with you're way;) if this also can't with the linear speed, witch way is the best?

JohnPapiomitis

if motion linear x is > 0 your moving left

if motion linear x is < 0 your moving right

if motion linear y is > 0 your moving up

if motion linear y is < 0 your moving down

wouter

yeah thanks, only i want to animate the sin so you get if direction is <20 animation picture 1, >20 but <40 animation picture 2 and so on... gives linear y also this direction? (or is there another way to do this?) (so the next step is that i can track the direction of the attribute)

only another problem (maybe) is that the attribute stays on 1/3 of the screen... so you see only the background moving and the attribute moving up and down... don't know if this is a problem?

thanks!

RH

Ok, so now I'm assuming by attribute you mean actor moving up or down rather that attribute increasing/ decreasing. Coming what Mark and John have said. As for changing the image depending on Y location...

If you name your images image1, image2, image3, etc. image1 for <20, image2 for <40 and so on.

You can then add a constrain attribute:

self.image -- to -- "image"..ceil(self.positionY/20)..".png"

wouter

mmm i'm doing something wrong...

tried couple of things:
made a game attribute velocity x and velocity y
constrain attribute: game.velocity y to self.motion.lineair velocity. Y and tried to display it (display text game.velocity y), but there happened nothing (only displayed 0...)

then i tried to make a game attribute up, and a rule:
when attribute self.motion.therest > 0 change attribute game.up to true, otherwise game.up to false,
only he displayed false the whole time...

what do i wrong??

thanks;)

oh and RH i see what you mean (and thanks;), only i don't know how to do that with the y location... (think thats also the fault here...)

RH

Ok, are you making the actor move up and down by constraining self.position.X using the sin function? If so the y velocity will be 0 I think so you won't be able to tell whether it is moving up or down using y velocity. Instead you will have to do something like what I told you above.

wouter said:
oh and RH i see what you mean (and thanks;), only i don't know how to do that with the y location... (think thats also the fault here...)

And to do it with the Y location in the attribute browser just go to

wouter

you mean a constrain attribute to safe the current position y (self.position.y) in lets say y position;) and then check if the y position is higher or less high than in y position. ?????
think this will work, only i need to animate the actor.... or must i use also the x location to calculate the direction?

thanks;)

wouter

only this also doesn't work (change attribute game.position y to self.position.Y) because the y stays on 0.... what to do???

RH

I don't really know what's going on in your project. Can you post a screenshot of the rule that you are using to move the attribute up and down using sin function?

wouter

the sin function?
looks like the example: http://gamesalad.com/wiki/how_tos:gsc_wave_movement
so i have:
constrain attribute: game.position y to game.amplitude*cos(game.period*(self.position.X-self.InitX))+game.balance (y position where the cos or sin is moving around;)

wouter

anyone?...
or can't this be done in gamesalad?...

(edit:)
hey i have an idea!!!!
if i let an other actor move with the sin actor, will the position y work on that actor?:D

[edit2]
mmm the y position works now! i think (not sure) that its now working because i have placed it on the top (for all the rules)...
so how can i calculate the direction?
x1,x2,y1,y2 and then y2-y1/x2-x1 ???

and thank you RH!!!! i was stuck on this point (is this correct english? lol)

RH

I just messed around with it and to calculate the direction create a rule so that:

When attribute game.up/down = game.balance + game.amplitude
change attribute game.up/down to 2

OTHERWISE

When attribute game.up/down = game.balance - game.amplitude
change attribute game.up/down to 1

This means that when game.up/down = 2 game.positionY is increasing and when it = 1 it's decreasing.

That works in my project I just tested it in so hopefully you can get it to work in yours.

wouter

ok thanks;)
i let you know if it works;)

wouter

lool
i tried something different (with y1 and y2):

constrain attribute game.y1 to self position.Y

rule: game.Y2>game.Y1{
game.up to 0
game.Y2 to game.Y1
}
otherwise{
game.up to 1
game.y2 to game.y1
}

only above the balance he says 1 and under false??!! lol do you know what my fault is? (now i am going to use you're way;)

wouter

mmm doesn't work!
did exactly what you said.

but it's logic because game.up = 0 in the beginning so:
0 = game.balance (260)+game.amplitude(30)
no its not... so otherwise:
0=260-30 no its not!!

so you mean something else what you said, or i don't get it;)

RH

If you want, you can send me the project file and I'll pop it in for you because it works in my project :S rhgamesalad [@] gmail.com is my email.

wouter

ok thank you very much!

i send you an email;)

RH

replied, and hopefully sorted!

wouter

it works, thank you very much!!

wouter