Sparrow Forum

1. 

   yafusername
   Member

   hello,

   how does one move, rotate, scale images within an atlas.

   im having trouble combining a Tween and a Movie. Is that the completely wrong technique?

   SPTextureAtlas *atlas = [SPTextureAtlas atlasWithContentsOfFile:ATLAS_XML];
   NSArray *frames = [atlas1 texturesStartingWith:@"ball_"];
   mMovie1 = [[SPMovieClip alloc] initWithFrames:frames fps:12];

   [self addChild:mMovie1];

   SPTween *tween = [SPTween tweenWithTarget:mMovie time:3.5f transition:SP_TRANSITION_EASE_IN_OUT];

   // you can animate any property as long as it's numeric (float, double, int).
   // it is animated from it's current value to a target value.
   [tween animateProperty:@"x" targetValue:self.stage.width - (int)mMovie.width/2.];
   [tween animateProperty:@"y" targetValue:self.stage.height - (int)mMovie.height/2.];
   [tween animateProperty:@"scaleX" targetValue:1.];
   [tween animateProperty:@"scaleY" targetValue:2.];
   [tween animateProperty:@"rotation" targetValue:PI_HALF];

   [self.stage.juggler addObject:tween];

   Posted 1 year ago #
2. 

   baike
   Moderator

   Looks fine to me. What is not happening that you expect should be happening?

   The only thing you might have missed is adding the movie to the juggler so that its frames are advanced:

   [self.stage.juggler addObject:mMovie];

   Also, make sure self.stage is not returning nil during this section of code (by default, it will do so during init).

   Posted 1 year ago #
3. 

   yafusername
   Member

   aha. you are correct about self.stage

   thanks for your fine intelligence.

   ok. permit another question; can an atlas or movieclip (or someother object) run for a duration. a bit more like a tween yet with moving images.
   it seems like movie is a constant loop, although there is a duration it seems like frameduration

   Posted 1 year ago #
4. 

   enbr
   Moderator

   If I understand correctly, you want the clip to only show for a certain period of time.

   [[self.stage.juggler delayInvocationAtTarget:self.stage.juggler byTime:2.0] removeObject:mMovie1];
   [[self.stage.juggler delayInvocationAtTarget:mMovie1 byTime:2.0] removeFromParent];

   EDIT:
   I like baike's idea better.

   Posted 1 year ago #
5. 

   baike
   Moderator

   You can do as enbr says, or you can register for an SP_EVENT_TYPE_MOVIE_COMPLETED event and remove the movie when it fires. You can also prevent a movie from looping by setting its loop property to NO (it defaults to yes).

   If you want the movie to complete over a period of 2 seconds, then you would do this:

   mMovie1 = [[SPMovieClip alloc] initWithFrames:frames fps:frames.count / 2.0f];

   Posted 1 year ago #
6. 

   yafusername
   Member

   i found the loop property set to NO default. but thanks for the response.

   Posted 1 year ago #

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