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story book flipping using 2 touch point in cocos2d
UITouch *fingerOne = [touchArray objectAtIndex:0];
    UITouch *fingerTwo = [touchArray objectAtIndex:1];

    CGPoint pointOne = [fingerOne locationInView:[fingerOne view]];
    CGPoint pointTwo = [fingerTwo locationInView:[fingerTwo view]];

    pointOne = [[CCDirector sharedDirector] convertToGL:pointOne];
    pointTwo = [[CCDirector sharedDirector] convertToGL:pointTwo];

//for forward flip

[[CCDirector sharedDirector] replaceScene:[CCTransitionPageTurn transitionWithDuration:1.0f scene:[FirstPage scene] backwards:FALSE]];

//for backward flip

[[CCDirector sharedDirector] replaceScene:[CCTransitionPageTurn transitionWithDuration:1.0f scene:[SecondPage scene] backwards:TRUE]];