拍摄方向不正确cocos2D-iPhone

Question

Bows rotates 360 Degree using touch and it fires arrow while touch ended.

Moving portion works perfectly but their need some correction while touch endes..
The problem is while i touch the bow,moving direction of arrow is opposite to bow such as 

当我沿相反方向旋转弓箭时，它可以正常工作，但仅当弓箭旋转时。.箭头应从右向左发射，弓箭的位置应为右。

我应该做些什么纠正才能使它们在一起成为可能。 对不起我的英语不好..

我的代码如下。

-(void) ccTouchMoved:(UITouch *)touch withEvent:(UIEvent *)event
{
    CGPoint location = [touch locationInView:[touch view]];
    location = [[CCDirector sharedDirector] convertToGL:location];

    [self setArrowFromPt:location centerPt:windowCenter];
}

-(void) setArrowFromPt:(CGPoint)touchPt centerPt:(CGPoint)centerPt
{
    diff = ccpSub(touchPt, centerPt);
    NSLog(@"%@", NSStringFromCGPoint(diff));

    angle = ccpToAngle(diff);
    normalized = ccpNormalize(diff);

    float START_ANGLE = 0;
    float RADIUS = 100.0;

    imgArrow.position = ccpAdd(centerPt, ccpMult(normalized, RADIUS));
    cocosAngle = -CC_RADIANS_TO_DEGREES(angle);
    imgArrow.rotation = START_ANGLE + cocosAngle;
}

-(void) ccTouchEnded:(UITouch *)touch withEvent:(UIEvent *)event
{
    CGPoint location = [touch locationInView:[touch view]];
    location = [[CCDirector sharedDirector] convertToGL:location];

    cocosAngle =  -CC_RADIANS_TO_DEGREES(angle);
    curangle = imgArrow.rotation;
    CGFloat rotateDiff = cocosAngle - curangle;  
    CGFloat rotateSpeed = 180; 
    rotateDuration = fabs(rotateDiff / rotateSpeed);

    if (_nextProjectile != nil) return;
    _nextProjectile = [[CCSprite spriteWithFile:@"newarrow.png"] retain];
    _nextProjectile.anchorPoint = ccp(0,0);
    _nextProjectile.position = ccp(380,150);

    [imgArrow runAction:[CCSequence actions:
                       [CCRotateTo actionWithDuration:rotateDuration angle:cocosAngle],
                       [CCCallFunc actionWithTarget:self selector:@selector(finishShoot)],
                       nil]]; 

    ccTime delta = 1.0;
    CGPoint normalizedShootVector = ccpNormalize(diff);
    CGPoint overshotVector = ccpMult(normalizedShootVector, 420);
    CGPoint offscreenPoint = ccpAdd(_nextProjectile.position, overshotVector);

    [_nextProjectile runAction:[CCSequence actions:
                                [CCMoveTo actionWithDuration:delta position:offscreenPoint],
                                [CCCallFuncN actionWithTarget:self selector:@selector(spriteMoveFinished:)],
                                nil]];
    _nextProjectile.tag = 2;

}

任何帮助表示赞赏。 提前致谢 ！！

Answer 1

因为我可以回答我的问题，

我已经通过纠正解决了我的问题

CGPoint overshotVector = ccpMult（normalizedShootVector，-420）;

放置-标志，导致我的箭头从右向左投掷。