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答案1： 問題解決? 將step改為如下即可 -(void)step:(ccTime)dt { ????if (rotate == 360) { ????????rotate = 0; ????} ????rotate += 5; ????float fradian = rotate * PI / 180; ????NSLog(@"%f??%f",rotate,fradian); ????id ac0 = [CCMoveTo actionWithDuration:0.01? ???????????????????????????????? position:*****(centerx + radius * sinf(fradian), ??????????????????????????????????????????????centery + radius * cosf(fradian))]; ????id ac1 = [CCRotateTo actionWithDuration:0.01 angle:(int)(rotate)]; ????[sparrowhead runAction:[CCSpawn actions:ac0,ac1,nil]]; } 答案2： 根據算法，寫成一個cocos2d的action ? /** Round circle a CCNode object clockwise a number of degrees by modiying it's rotation attribute. */ @interface CCRoundBy : CCActionInterval <NSCopying> { ????BOOL turn;// Forward or Reverse round ????float startAngle;// default ????float radius;// Round circle radius ????CGPoint center;// Round circle center point } /** creates the action */ +(id) actionWithDuration:(ccTime)duration turn:(BOOL)a center:(CGPoint)point radius:(float)r; /** initializes the action */ -(id) initWithDuration:(ccTime)duration turn:(BOOL)a center:(CGPoint)point radius:(float)r; @end ? // // CCRoundBy // #pragma mark - #pragma mark CCRoundBy ? @implementation CCRoundBy +(id) actionWithDuration: (ccTime) t turn:(BOOL) a center:(CGPoint)point radius:(float)r {???? ????return [[[self alloc] initWithDuration:t turn:a center:point radius:r] autorelease]; } ? -(id) initWithDuration: (ccTime) t turn:(BOOL) a center:(CGPoint)point radius:(float)r { ????if( (self=[super initWithDuration: t]) ) { ????????turn = a; ????????radius = r; ????????center = point; ????} ????return self; } ? -(id) copyWithZone: (NSZone*) zone { ????CCAction *copy = [[[self class] allocWithZone: zone] initWithDuration: [self duration] turn: turn center:center radius:radius]; ????return copy; } ? -(void) startWithTarget:(id)aTarget { ????[super startWithTarget:aTarget]; ????startAngle = [target_ rotation]; ????if (turn) { ????????((CCNode *)target_).position = *****Add(center, *****(-radius, 0)); ????} ????else { ????????((CCNode *)target_).position = *****Add(center, *****(radius, 0)); ????}???? } ? -(void) update: (ccTime) t {???? ????// XXX: shall I add % 360 ????float rotate =??(startAngle + 360.0f * t ); ????if (turn) { ????????rotate *= -1; ????} ????[target_ setRotation:rotate]; ???? ????float fradian = rotate * M_PI / 180.0f; ????CGPoint pos = *****(center.x + radius * sinf(fradian), ??????????????????????center.y + radius * cosf(fradian)); ????[target_ setPosition: pos]; } ? -(CCActionInterval*) reverse {???? ????BOOL result = !turn; ????return [[self class] actionWithDuration:duration_ turn:result center:center radius:radius]; } ? @end ?

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轉載于:https://www.cnblogs.com/wujian1360/archive/2012/03/10/2389613.html

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