some doubts about iteration and functions

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edler

6

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Joined: 11th Jan 2018

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Posted: 28th Mar 2018 08:57

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FIRST DOUBT: Having a code...

playsprite(1,20)
DO
sync()
LOOP

animation works, but

DO
Playsprite(1,20)
sync()
LOOP

don't works. why?

SECOND DOUBT: with the code...

DO
asteroid()
sync()
LOOP

FUNCTION asteroid()
playsprite(1,20)
ENDFUNCTION

The animation don't works. But putting a condition inside function..

DO
asteroid()
sync()
LOOP

FUNCTION asteroid()
if getrawkeypressed(32) //spacebar
playsprite(1,20)
endif
ENDFUNCTION

works pressing the key. What have i do to plays without condition?

I thought that understaded the functions and iteration, but this dismantle all mi mind!!

thanks!!

--
edler

AppGameKit forum in Spanish, yet!

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Dybing

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Joined: 12th Sep 2011

Location: Bergen, Norway

Posted: 28th Mar 2018 09:32 Edited at: 28th Mar 2018 09:37

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Playsprite will start a sprite animation from frame 1 and at each sync() advance to next frame - so if you put that inside a (tight) loop, all you'll achieve is playing frame 1 again and again.

Same with your second example - it'll only run Playsprite() once when you press the key. At all other times, it'll just happily advance the sprite one frame at each sync() after being activated at least once.

The preferred way of organizing views is:

1: Initialization
Declare all local variables and structures of the function that will be needed (apart from what is imported in the function signature). Set initial values where needed.

2: Set-Up
Draw up all elements of the view.

3: The loop
3-1: Read input
3-2: Process data
3-3: Update elements in view
3-4: Sync

4: Tear-Down
Clear all sprites and text of view that will not carry over to next.

5: Exit function, with return values if need be.

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edler

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Posted: 28th Mar 2018 11:36 Edited at: 28th Mar 2018 11:36

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thanks!! but i dont understand still, sorry. because if the function has the code:

function anim()
if getspriteplaying(1)=0
playsprite(1,20)
endif
endfunction

But with this code don't works:

function anim()
if 1=1
playsprite(1,20)
endif
endfunction

Why?

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edler

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Dybing

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Location: Bergen, Norway

Posted: 28th Mar 2018 12:18

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The first will only be true if your sprite is not playing, hence playsprite() will only be called once.

The second will always be true, so playsprite() will be called each and every time. So if you call upon your anim() function before each sync(), the sprite will always only display its' frame 1 as it get restarted each sync() cycle.

Playsprite() should only be called once to start a sprite-animation. Once called, each sync() will advance the sprite one frame in its' animation. The sprite will continue playing until either stopSprite() is called or deleteSprite() is called.

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edler

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Posted: 28th Mar 2018 12:31

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Yes! Thanks! Now I understand it completely!!

global a=0

do
anim()
sync()
loop

function anim()
if a=0
playsprite(1,11)
a=1
endif
endfunction

Only one call. EUREKA!!

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edler

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PHeMoX

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Posted: 28th Mar 2018 18:56

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It's probably also a smart idea to always check whether something is already animating, before overwriting the start of animations.
Especially true for 3D animations. In fact, that stuff only works reliably when using 'Select' and 'Case' in a separate function I've noticed. Then just feed it the Case it should follow from elsewhere.

+ Code Snippet


ObjectID = LoadObjectWithChildren("mymodel.x") // load model with animations

Do
animate(1,ObjectID) // pass the type of animation you want and object it should affect
Sync()
Loop

Function animate(in, ObjectID)
select in
case 1:
         // add code for animation here
         if GetObjectIsAnimating(ObjectID) = 0   // check if animation already started
	 PlayObjectAnimation(ObjectID,"Idle",3,19,1,0)  // name and numbers depend on your model animations, but this plays once, finishes and then starts again when GetObjectIsAnimating is false
	endif 
endcase
endselect
endfunction

You could add extra conditions that will select a different cases in the main Do Loop. Just add the case code and point to it using animate(3,ObjectID) to tell it to go to case 3.

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