用于 CCMotionStreak 或粒子系统的 cocos2d 多点触控

Question

我想为我的游戏启用多点触控。但我不知道如何实现 CCMotionStreak 的多点触控版本。每次我用 2 个手指触摸 2 个点时，中间就会出现一条丝带。我想要的是每个手指一根丝带。 如果我能在粒子系统中做到这一点，我会更好，但基本上我面临同样的问题。 以前有人做过吗？就像水果忍者一样。

Answer 1

您需要为每次触摸创建一个 CCMotionStreak 节点。

例如：

-(void)createMotionStreak:(NSInteger)touchHash
{
    CCMotionStreak* streak = [CCMotionStreak streakWithFade:1.7f minSeg:10 image:@"arrow.png" width:32 length:32 color:ccc4(255, 0, 255, 255)];
    [self addChild:streak z:5 tag:touchHash];
}

-(void)removeMotionStreak:(NSInteger)touchHash
{
    [self removeChildByTag:touchHash cleanup:YES];
}

-(CCMotionStreak*)getMotionStreak:(NSInteger)touchHash
{
    CCNode* node = [self getChildByTag:touchHash];
    if(![node isKindOfClass:[CCMotionStreak class]]) {
        [self createMotionStreak:touchHash];
    }
    return (CCMotionStreak*)node;
}

-(void) addMotionStreakPoint:(CGPoint)point on:(NSInteger)touchHash
{
    CCMotionStreak* streak = [self getMotionStreak:touchHash];
    [streak.ribbon addPointAt:point width:32];
}

-(CGPoint)locationFromTouch:(UITouch*)touch
{
    CGPoint touchLocation = [touch locationInView: [touch view]];
    return [[CCDirector sharedDirector] convertToGL:touchLocation];
}

-(void)ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event {
    NSEnumerator* enumerator = [touches objectEnumerator];
    UITouch* oneTouch = nil;
    while (oneTouch = [enumerator nextObject]) {
        [self addMotionStreakPoint:[self locationFromTouch:oneTouch] on:oneTouch.hash];
    }
}

-(void)ccTouchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
    NSEnumerator* enumerator = [touches objectEnumerator];
    UITouch* oneTouch = nil;
    while (oneTouch = [enumerator nextObject]) {
        [self removeMotionStreak:oneTouch.hash];
    }
}