cocos2d for iPhone

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

1. 

   pravin
   Member

   Hi everyone ,

   I am new to cocos2d and I am developing game using cocos2d framework.
   I want to set new image to existing/allocated sprite at run time.

   Let me explain with example :
   In cocoa I am using UIImageView , to resize the image I am setting property of UIImageView as
   [ElectricWaveOne setBounds:CGRectMake(CenterPoint.x ,CenterPoint.y, width, height)];
   here ElectricWaveOne is an object of UIImageView. so I can resize existing image.

   I want to do same with sprite object.
   Is there any property of sprite/AtlasSprite object?
   How to change image of sprite at run time?

   Regards'
   Pravin

   Posted 2 years ago #
2. 

   ob1
   Member

   I am not sure I inderstand what you mean, but you can use animations and frames and use setDisplayFrame.

   I guess the best way is to look at AtlasSpriteTest in the test folder.

   Posted 2 years ago #
3. 

   pravin
   Member

   Thanks for the reply.

   I use fallowing method to display aniamtion
   [enemySprite setDisplayFrame:@"fly" index: displayFrame ];

   where enemySprite is an object of AtlasSprite and It's working fine.

   Let me Explain problem in detail.
   I have created object of AtlasSprite as fallows.
   [AtlasSprite spriteWithRect:CGRectMake(0, 0, widht, height) spriteManager:mgr ];
   suppose widht =30, height=100 ;

   Here is Atlas Animation frames.

   AtlasAnimation * animFly = [AtlasAnimation animationWithName:@"fly" delay:1.0f];
   [animFly addFrameWithRect: CGRectMake(37*0, 0, 30, 100)];
   [animFly addFrameWithRect: CGRectMake(37*1, 0, 30, 100)];
   [animFly addFrameWithRect: CGRectMake(37*2, 0, 30, 100)];

   with [enemySprite setDisplayFrame:@"fly" index: displayFrame ];
   I can dispaly the texture of 30x100 (width x height).

   But my variable "height" varies at run time.

   My problem how to assign this new rect to AtlasSprite object.
   and How can I display the the texture of 30xheight i.e. (width x vaiable height).
   where height = 50 to 500.

   Posted 2 years ago #
4. 

   Clain
   Member

   @pravin :
   Consider using the setTextureRect: function on your AtlasSprite

   Posted 2 years ago #
5. 

   pravin
   Member

   I tried setTextureRect as fallows

   [enemySprite setTextureRect:CGRectMake(200, 200, 30, 120)];

   but it's not working.

   Posted 2 years ago #
6. 

   Clain
   Member

   setTextureRect does work, but may not help you in what it is you want to achieve. Can you post the image you're using for your AtlasSpriteManager and one or two images of what you're trying to obtain in cocos ?

   Posted 2 years ago #
7. 

   ob1
   Member

   I think I understand what pravin means, but unfortunately I don't see an elegant solution.

   As far as I understand he has animated sprites which are only partly visible at different point in time.

   The question is how to change the visible part.

   @pravin, Maybe you can sublass AtlasSprite, modify "setDisplayFrame" to add a "height" parameter and the modify:

   CGRect rect = [frame rect];

   with something like:

   CGRect oldrect = [frame rect];
   CGrect rect = CGRectMake(oldrect.origin.x,oldrect.origin.y,oldrect.size.width,height);

   I hope I am not talking out of my ass.

   Posted 2 years ago #
8. 

   psionic
   Member

   There's still the scale property of the AtlasSprite that you can use
   for the purpose of setting the height/width of the actual sprite (not
   the image which it is sourcing from).

   Then you'd use the setTextureRect to actually change what part of the
   image it's sourcing from.. is there anything else you needed?

   Chris.

   On Wed, Jul 1, 2009 at 2:22 PM, <cocos2d-iphone-discuss@gamesforfood.cl> wrote:
   > ob1 says:
   >
   > I think I understand what pravin means, but unfortunately I don't see an
   > elegant solution.
   >
   > As far as I understand he has animated sprites which are only partly visible
   > at different point in time.
   >
   > The question is how to change the visible part.
   >
   > @pravin, Maybe you can sublass AtlasSprite, modify "setDisplayFrame" to add
   > a "height" parameter and the modify:
   >
   > CGRect rect = [frame rect];
   >
   > with something like:
   >
   > CGRect oldrect = [frame rect];
   > CGrect rect =
   > CGRectMake(oldrect.origin.x,oldrect.origin.y,oldrect.size.width,height);
   >
   > I hope I am not talking out of my ass.
   >
   > Read the whole thread.

   Posted 2 years ago #
9. 

   iisystems
   Member

   Hi,

   I have a similar problem in that I want to swap out a set of frame animations at runtime. I have 3 frames which run in a RepeatForever animation. As the sprite gets hit, I want the character to appear progressively sicker, so I want to replace the original 3 frames added with addFrameWithRect with another three frames in the same atlas. I don't see any way to remove frames which were already added. Should I just stop the original animation and create a new one with the new frames? Maybe this is a (hack) solution for Pravin's question also?

   Thanks,
   Scott

   Posted 2 years ago #
10. 

    iisystems
    Member

    FYI, the approach above works to swap out animations at runtime. If someone comes up with a better solution, I'll replace it...

    Posted 2 years ago #

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