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copied!<p>I've needed this a couple of times and decided to make a extension for CCNode, tested it abit and seems to work fine. Can be really useful to some :)</p> <p>It's tested with 1.x but It should work fine in 2.x too. Supports transformed nodes and HD.</p> <p>Just add this to your project and import whenever you need it - It will be added to all classes deriving from CCNode. (CCSprite, CCLayer)</p> <p><strong>Interface</strong></p> <pre><code>#import "cocos2d.h" @interface CCNode (Extensions) // Returns the parent coordinate for an anchorpoint. Useful for aligning nodes with different anchorpoints for instance -(CGPoint)positionOfAnchorPoint:(CGPoint)anchor; // As above but using anchorpoint in points rather than percentage -(CGPoint)positionOfAnchorPointInPoints:(CGPoint)anchor; //Sets the anchorpoint, to not move the node set lockPosition to `YES`. Setting it to `NO` is equal to setAnchorPoint, I thought this would be good for readability so you always know what you do when you move the anchorpoint -(void)setAnchorPoint:(CGPoint)a lockPosition:(BOOL)lockPosition; @end </code></pre> <p><strong>Implementation</strong></p> <pre><code>#import "CCNode+AnchorPos.h" @implementation CCNode (Extensions) -(CGPoint)positionOfAnchorPoint:(CGPoint)anchor { float x = anchor.x * self.contentSizeInPixels.width; float y = anchor.y * self.contentSizeInPixels.height; CGPoint pos = ccp(x,y); pos = CGPointApplyAffineTransform(pos, [self nodeToParentTransform]); return ccpMult(pos, 1/CC_CONTENT_SCALE_FACTOR()); } -(CGPoint)positionOfAnchorPointInPoints:(CGPoint)anchor; { CGPoint anchorPointInPercent = ccp(anchor.x/self.contentSize.width, anchor.y/self.contentSize.height); return [self positionOfAnchorPoint:anchorPointInPercent]; } -(void)setAnchorPoint:(CGPoint)a lockPosition:(BOOL)lockPosition { CGPoint tempPos = [self positionOfAnchorPoint:a]; self.anchorPoint = a; if(lockPosition) { self.position = tempPos; } } @end </code></pre>

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