Sparrow Forum

1. 

   BCNbox
   Member

   Hi all,
   First sorry for my english!
   I've been trying to animate an object by onEnterFrame event.

   in MyClass.m (Which his superclass is SPSprite)

   @implementation MyClass
    
   - (id)init {
       if (self = [super init]) {
           //initialize all global variables and puts a SPImage inside
           //...
           //And finally the event listener
           [self addEventListener:@selector(onEnterFrame:) atObject:self forType:SP_EVENT_TYPE_ENTER_FRAME];
       }
       return self;
   }
    
   - (void)onEnterFrame:(SPEnterFrameEvent *)event
   {
       //Printing X and width (?)
       NSLog(@"X: %f | Width: %f", self.x, self.width);
       self.x += 5;
   }
    
   @end

   In my Game.m
   i'm creating some objects of MyClass

   MyClass *obj = [[[MyClass alloc] init] autorelease];
   obj.x = 10;
   obj.y = 10;

   The problem: When I print the X and width i't shows:
   X: 10.000000 | width: 92.000000
   X: 15.000000 | width: 97.000000
   X: 20.000000 | width: 102.000000
   X: 25.000000 | width: 107.000000
   X: 30.000000 | width: 112.000000
   ...
   ...
   And follows adding +5 to the width property.

   There is no way to animate with onEnterFrame the object's X from itself?
   Thanks guys!!!

   Posted 1 year ago #
2. 

   Shilo
   Master Sparrow

   That's very strange, it should work fine.
   I assume your importing everything correctly and added the object to the stage since you get the onEnterFrame callback.
   If your SPSprite has no content, it should be showing 0 width and height. Maybe something outside of the code you have shown is changing the width.

   I don't see any mistakes from you code shown. Here is the full code, maybe you will find something you missed.

   Game.h:

   #import <Foundation/Foundation.h>
   #import "Sparrow.h"
   #import "MyClass.h"
    
   @interface Game : SPStage {
    
   }
    
   @end

   Game.m:

   #import "Game.h"
    
   @implementation Game
   - (id)initWithWidth:(float)width height:(float)height {
   	if (self = [super initWithWidth:width height:height]) {
   		MyClass *obj = [[[MyClass alloc] init] autorelease];
   		[self addChild:obj];
       }
       return self;
   }
   @end

   MyClass.h:

   #import "SPSprite.h"
    
   @interface MyClass : SPSprite {
    
   }
    
   @end

   MyClass.m:

   #import "MyClass.h"
   #import "SPEnterFrameEvent.h"
    
   @implementation MyClass
   - (id)init {
       if (self = [super init]) {
           [self addEventListener:@selector(onEnterFrame:) atObject:self forType:SP_EVENT_TYPE_ENTER_FRAME];
       }
       return self;
   }
    
   - (void)onEnterFrame:(SPEnterFrameEvent *)event {
   	NSLog(@"X: %f | Width: %f", self.x, self.width);
       self.x += 5;
   }
   @end

   Posted 1 year ago #

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