cocos2d for iPhone

A fast, easy to use, free, and community supported 2D game engine

1. 

   rollerueckwaerts
   Member

   Hello,
   I like to implement a small countdown. It works fine.
   I have a label and a timer. All good :)

   The only prblem is, the text of the label don't change, instead of this, the new text is overlaying the old text.

   My Source:

   // init
   [self schedule: @selector(tick:)];
           [self schedule: @selector(tick2:) interval:1.0];
   	[self schedule: @selector(tick3:) interval:2.0];
           [self schedule: @selector(tick4:) interval:3.0];
   
   	[self addChild:einleitung];// the Label
   
   .....
   
   -(void) tick: (ccTime) dt
   {
   	[einleitung setString:@"- 3 -"];
   
   }
   
   -(void) tick2: (ccTime) dt
   {
   	[einleitung setString:@"- 2 -"];
   
   }
   
   -(void) tick3: (ccTime) dt
   {
   	[einleitung setString:@"- 1 -"];
   
   }
   
   -(void) tick4: (ccTime) dt
   {
   	[einleitung setString:@"START"];
   }

   What's wrong ?
   Do i have to cleanup the old text ? If yes, how ?

   Hoping for help :)
   Greetings

   Posted 1 year ago #
2. 

   ob1
   Member

   I think the problem is that you have multiple timers that continue to fire.

   Why not just one timer firing every second with something like:

   -(void) tick: (ccTime) dt
   {
      switch (countdown)
     {
        case 3:
   	[einleitung setString:@"- 3 -"];
        break;
        ...
     }
     countdown--;
   }

   Posted 1 year ago #
3. 

   rollerueckwaerts
   Member

   Ok. I try :)

   Now i only have one timer

   -(void) tick: (ccTime) dt
   {
   
   		elapsedTime += dt;
   		NSLog(@"Seconds passed: %f", elapsedTime);
   
   	if((elapsedTime > 1) && (elapsedTime <2)){
   	[einleitung setString:@"- 3 -"];
   	[[SimpleAudioEngine sharedEngine] playEffect:@"click.mp3"];
   	}
   	if((elapsedTime >= 2)&& (elapsedTime <3)){
   		[einleitung setString:@"- 2 -"];
   		[[SimpleAudioEngine sharedEngine] playEffect:@"click.mp3"];
   	}
   	if((elapsedTime >= 3)&& (elapsedTime <3.5)){
   		[einleitung setString:@"- 1 -"];
   		[[SimpleAudioEngine sharedEngine] playEffect:@"click.mp3"];
   	}
   	if((elapsedTime >= 3.5)&& (elapsedTime <4)){
   		[einleitung setString:@"START"];
   		[[SimpleAudioEngine sharedEngine] playEffect:@"gamestart.mp3"];
   	}	
   
   }

   Its not working :)
   My elapsedTime Variable looks like this 1.729512
   so its difficult to compare it in If Clauses.
   The main problem is, the timer fires every frame, is it possible to fire the timer only on time a second ?

   Posted 1 year ago #
4. 

   tesseract
   Member

   Don't use the actual elapsedTime -- create a member variable, countdown, initialize it to 4 (or whatever you want) then use the code posted by @ob1

   Posted 1 year ago #
5. 

   Vabu
   Member

   Here's another suggestion in your code you could do this, it's how I handle such situations.

   -(void) tick: (ccTime) dt
   {
   
           elapsedTime += dt;
           static int totalTime = 0;
   	NSLog(@"Seconds passed: %f", elapsedTime);
   
   	if((elapsedTime > 1)
           {
             // A second has passed so increment our counter by 1 (1 second!)
             totalTime++;
   
             if(totalTime < 4)
             {
               NSString newTimeText = [NSString stringWithFormat:@"- %d -", totalTime];
   	   [einleitung setString:newTimeText];
   	   [[SimpleAudioEngine sharedEngine] playEffect:@"click.mp3"];
             }
             else
             {
               // Stop the timer
               self unschedule:@selector(tick:)];
               // Start!
   	    [einleitung setString:@"START"];
   	    [[SimpleAudioEngine sharedEngine] playEffect:@"gamestart.mp3"];
             }
   
             // Reset elapsedTime
             elapsedTime = 0.0f;
           }
   }

   Posted 1 year ago #
6. 

   rollerueckwaerts
   Member

   Thank you all!!

   Now the countdown works, but the newString still overlays the old :(

   -(id)init{
   	if( (self=[super init] )) {
   
   	size = [[CCDirector sharedDirector] winSize];
   
   	einleitung = [CCLabel labelWithString:@"test" fontName:@"Marker Felt" fontSize:44];
   	einleitung.position =  ccp( size.width-250 , size.height-150 );
   	einleitung.spriteSheet.scaleX = 2.0;
   	einleitung.spriteSheet.scaleY = 2.0;
   
   	elapsedTime = 4;
   
   	[self schedule: @selector(tickCountdown:) interval:1];
   		[self addChild:einleitung];
   
   	}
   	return self;
   }
   
   -(void) tickCountdown: (ccTime) dt
   {
   	elapsedTime--;
   	NSLog(@"%d",elapsedTime);
   
   	if( elapsedTime >= 1 ) {
   		NSString *tempString = [NSString stringWithFormat:@"Starting in : %i", elapsedTime];
   		[einleitung setString:tempString];
   
   	}
   	else {
   		[self unschedule:@selector(tickCountdown:)];
   	}
   }

   Posted 1 year ago #
7. 

   Vabu
   Member

   @rollerueckwaerts,

   as stated in CCLabel.h "Changing the string is as expensive as creating a new CCLabel. To obtain better performance use CCLabelAtlas" (at least with 0.99.4-rc3.

   So with that said, you might as well just [self removeChild:einleitung cleanup:TRUE]; and recreate the label if you are having difficulties with it. Or look into CCLabelAtlas.

   Good luck!

   Posted 1 year ago #
8. 

   tesseract
   Member

   @Vabu is right -- this is a much better approach. This is how I did a similar thing:

   In the constructor:
   

   timerValue = [CCBitmapFontAtlas bitmapFontAtlasWithString:@"00:00" fntFile:@"consolas13.fnt"];

   then I have this method that is called to update the display:

   -(void) updateElapsedTime:(int) time
   {
   	int secs = time % 60;
   	int mins = time / 60;
   
       [timerValue setString:[NSString stringWithFormat:@"%02d:%02d", mins, secs]];
   }

   Posted 1 year ago #

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