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cocos2d 环绕已知点移动一圈
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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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