cocos2d for iPhone

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

1. 

   pravin
   Member

   Hello!

   Could you help me with the following task?

   I have created the texture as

   self.texture = [[TextureMgr sharedTextureMgr] addImage: @"rock.png"];

   Now I have problem that - How to transform the texture?

   Regards,
   Pravin

   Posted 2 years ago #
2. 

   patrickC
   Member

   What do you mean transform?
   From what I understand in openGL, you would play around with the uv coordinates when you're applying to texture to a face to "transform" it.

   Posted 2 years ago #
3. 

   pravin
   Member

   Thanks for reply.

   Transform means rotating object in 0 to 360 degrees.
   In cocos2d the texture is created in openGL and I don't know about uv coordinates.

   How to rotate the texture in 0 to 360 degrees.

   Posted 2 years ago #
4. 

   Joao Caxaria
   Member

   Don't rotate the texture, rotate the sprite that shows it.. Would it work for you?

   Posted 2 years ago #
5. 

   pravin
   Member

   Thanks for reply.

   I rotate the AtlasSprite instance as fallows.

   enemySprite.rotation = angle;

   where angle is 0 to 360;

   But It's not working

   Posted 2 years ago #
6. 

   Joao Caxaria
   Member

   It was 0 and you set it as 360?

   Posted 2 years ago #
7. 

   pravin
   Member

   Yes. 0 to 360 with increment of 1 degree.
   to do motion like staring wheel.
   i.e. make rotation along it's axis it self.

   Posted 2 years ago #
8. 

   Joao Caxaria
   Member

   ok I see. It should work.. can you post your code here?

   Posted 2 years ago #
9. 

   Codemattic
   Moderator

   If you post the code it will be so much clearer. FYI you cant just do a for loop from 0 to 360 and rotate a sprite bc you wont see the updates. Also if you want something to rotate over time consider using a RotateTo or RotateBy action.

   Posted 2 years ago #
10. 

    pravin
    Member

    Ok.

    here is my code

    -(void) updateFlyingFrames: (ccTime) dt
    {
    displayFrame ++ ;
    displayFrame = displayFrame%6 ;
    [enemySprite setDisplayFrame:@"fly" index: displayFrame ];

    static int angle;
    angle = angle%360 ;

    switch (angle) {
    case 0:
    angle=0;
    break;
    }
    angle++;
    enemySprite.rotation = angle ;

    }

    I called updateFlyingFrames fuction after 0.1 iterval as

    [self schedule:@selector(updateFlyingFrames:) interval:0.1f] ;

    Posted 2 years ago #
11. 

    pravin
    Member

    Here enemySprite is instance of AtlasSprite.

    I didn't get How to apply function RotateTo or RotateBy to AtlasSprite.

    Posted 2 years ago #
12. 

    Codemattic
    Moderator

    "I didn't get How to apply function RotateTo or RotateBy to AtlasSprite."

    Look in the SpritesTest demo in the SpriteRotate class

    Posted 2 years ago #
13. 

    Codemattic
    Moderator

    id actionTo = [RotateTo actionWithDuration: 2 angle:45];
    id actionBy = [RotateBy actionWithDuration:2  angle: 360];
    [tamara runAction: actionTo];
    [grossini runAction: actionBy];

    Posted 2 years ago #
14. 

    pravin
    Member

    Actually , I am new to cocos2d framework.
    It works great. Thanks for the follow up.

    Posted 2 years ago #
15. 

    jamil_khan007
    Member

    patrickC: i want to know how to transform the uv coordinates to a portion of texture? eg i want to apply liquify effect to a portion of an image? or create a pinch effect to the face???

    Posted 2 years ago #
16. 

    jamil_khan007
    Member

    how can i access the texture of a Sprite? how will i do the this: take a face photo, touch the nose part and that nose should glow like Lens effect?

    Posted 2 years ago #

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