Question

I haven’t seen easy examples about rotaion around a specified point. I tried something like this but it doesn’t work:

//CCNode *node is declared
//In a function of a subclass of CCSprite
- (void)moveWithCicrlce
{
anchorNode = [CCNode node];
anchorNode.position = ccpSub(self.position, circleCenter);
anchorNode.anchorPoint = circleCenter;
[anchorNode runAction:[CCRotateBy actionWithDuration:1 angle:90]];
[self runAction:[CCRepeatForever actionWithAction:[CCSequence actions:[CCCallFunc actionWithTarget:self selector:@selector(rotate)], [CCDelayTime actionWithDuration:0.1], nil]]];
}

- (void)rotate
{
self.position = ccpAdd(anchorNode.position, anchorNode.anchorPoint);
}

Answer 1

My approximate solution:

@interface Bomb : NSObject {
    CCSprite *center;
}

...

@end

and some methods:

- (void)explode
{
    BombBullet *bullet = [BombBullet spriteWithFile:@"explosion03.png"];
    [[[CCDirector sharedDirector] runningScene] addChild:bullet];

    center = [CCSprite spriteWithTexture:bullet.texture];
    center.position = explosionPoint;
    center.anchorPoint = ccp(-0.5, -0.5);
    center.visible = NO;
    [[[CCDirector sharedDirector] runningScene] addChild:center];
    [center runAction:[CCRotateBy actionWithDuration:1 angle:360]];

    CCCallFunc *updateAction = [CCCallFuncN actionWithTarget:self selector:@selector(update:)];
    [bullet runAction:[CCRepeatForever actionWithAction:[CCSequence actions:updateAction, [CCDelayTime actionWithDuration:0.01], nil]]];
}

- (void)update:(id)sender
{
    BombBullet *bombBullet = (BombBullet *)sender;
    bombBullet.rotation = center.rotation;
    bombBullet.position = ccpAdd(center.position, center.anchorPointInPoints);
    bombBullet.position = ccpAdd(bombBullet.position, ccp(-bombBullet.contentSize.width / 2, -bombBullet.contentSize.height / 2));
    bombBullet.position = ccpRotateByAngle(bombBullet.position, center.position, bombBullet.rotation);
}

of course I should add sprite deleting.