cocos2d, CC_HONOR_PARENT_TRANSFORM_SCALE, how do i use this enum property?

I want to add a sprite2 to sprite1, scale the width of of sprite 1 without scaling sprite2.

I found the code below part of the Cocos2d api; CCSprite.h line 54, but I don't开发者_运维知识库 know how to use it nor what the "1<<2" means.

Basically, I'm doing the following but it's not working:

[self addChild: sprite1];

[sprite1 addChild: sprite2]

sprite1.scaleX = 2;

sprite2.CC_HONOR_PARENT_TRANSFORM_SCALE = false;???

Yeah not sure how to use the enum.

thank you

typedef enum {
//! Translate with it's parent
CC_HONOR_PARENT_TRANSFORM_TRANSLATE =  1 << 0,
//! Rotate with it's parent
CC_HONOR_PARENT_TRANSFORM_ROTATE    =  1 << 1,
//! Scale with it's parent
CC_HONOR_PARENT_TRANSFORM_SCALE     =  1 << 2,

//! All possible transformation enabled. Default value.
CC_HONOR_PARENT_TRANSFORM_ALL       =  CC_HONOR_PARENT_TRANSFORM_TRANSLATE | CC_HONOR_PARENT_TRANSFORM_ROTATE | CC_HONOR_PARENT_TRANSFORM_SCALE,

} ccHonorParentTransform;

---

<< - is a bit operation of a shift (my native language is russian and i've translated as is - not sure it's correct). But it is not required for you to understand how it work in this situation because in this case it's just a method to fill the enum values.

From cocos2d documentation

- (ccHonorParentTransform) honorParentTransform [read, write, assign] whether or not to transform according to its parent transfomrations. Useful for health bars. eg: Don't rotate the health bar, even if the parent rotates. IMPORTANT: Only valid if it is rendered using an CCSpriteBatchNode.

Are you using batch rendering ?

EDIT:

This line is very strange (doesn't it give a warning?)

 sprite2.CC_HONOR_PARENT_TRANSFORM_SCALE = false

You should write

sprite2.honorParentTransform &= ~CC_HONOR_PARENT_TRANSFORM_SCALE;

PS: The enum is created using bit operations because it's give you the ability to misc the configuration. For example you can write

sprite2.honorParentTransform &= ~(CC_HONOR_PARENT_TRANSFORM_SCALE | CC_HONOR_PARENT_TRANSFORM_ROTATE);

It will enable both translate and rotate So the honorParentTransform is a bitmask, that allows you to configure it's configuration - not only use some predefined values but also use there combinations.

Here you can write more about bitwise operations http://www.cprogramming.com/tutorial/bitwise_operators.html

In our case is happening something like this: You have a current mask for example 01101111 (it is 32 bit really) and CC_HONOR_PARENT_TRANSFORM_SCALE is something like this 00001000 - it have only one nonzero bit. ~ - is inversion: so it transform 00010000 to 11101111 and then you make the bitwise addition with you current mask - so all the bits will be preserved except the forth one!