射击方向不正确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 

虽然我向相反的方向旋转弓，但它工作正常，但只有当弓旋转时..箭头应该从右向左射击，弓的位置应该是正确的。

我应该做些什么来纠正它们。？！ 对不起，我的英文..

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;

}

任何帮助都是赞赏的。 在此先感谢!!

Answer 1

我可以回答我的问题，

我通过纠正

解决了我的问题

CGPoint overshotVector = ccpMult（normalizedShootVector，-420）;

put - sign，导致我的箭头从右向左投掷。