am making a canon to fire objects. back of the canon the plunger is attached. plunger acts for set speed and angle. canon rotates 0-90 degree and plunger moves front and back for adjust speed. when am rotates the canon by touches moved its working fine. when plunger is pull back by touches moved and it rotates means the plunger is bounds outside of the canon.

how to control this:-

my code for plunger and canon rotation on touches moved. ( para3 is the canon , para6 is my plunger):-

    CGPoint touchLocation = [self convertTouchToNodeSpace:touch];
    CGPoint oldTouchLocation = [touch previousLocationInView:touch.view];
    oldTouchLocation = [[CCDirector sharedDirector] convertToGL:oldTouchLocation];
    oldTouchLocation = [self convertToNodeSpace:oldTouchLocation];
    if (CGRectContainsPoint(CGRectMake(para6.position.x-para6.contentSize.width/2, para6.position.y-para6.contentSize.height/2, para6.contentSize.width, para6.contentSize.height), touchLocation) && (touchLocation.y-oldTouchLocation.y == 0))
    {
        CGPoint diff = ccpSub(touchLocation, oldTouchLocation);
        CGPoint currentpos = [para6 position];
        NSLog(@"%d",currentpos);
        CGPoint destination = ccpAdd(currentpos, diff);
        if (destination.x < 90 && destination.x >70)
        {
            [para6 setPosition:destination];
            speed = (70 + (90-destination.x))*3.5 ;
        }

    }
if(CGRectIntersectsRect((CGRectMake(para6.position.x-para6.contentSize.width/8, (para6.position.y+30)-para6.contentSize.height/10, para6.contentSize.width, para6.contentSize.height/10)),(CGRectMake(para3.position.x-para3.contentSize.width/2, para3.position.y-para3.contentSize.height/2, para3.contentSize.width, para3.contentSize.height))))

            {

        [para3 runAction:[CCSequence actions:
                          [CCRotateTo actionWithDuration:rotateDuration angle:rotateDiff],
                          nil]];
        CGFloat plungrot = (rotateDiff);
        CCRotateTo *rot = [CCRotateTo actionWithDuration:rotateDuration angle:plungrot];
        [para6 runAction:rot];
    }
}