Particle engine problem

Question

i am implementing particle engine and here is my code:

-(id) init
{
    // always call "super" init
    // Apple recommends to re-assign "self" with the "super" return value
    if( (self=[super init] )) 
    {
        self.isTouchEnabled = YES;
        emitter = [[CCParticleMeteor alloc] init];
        emitter.texture     =   [[CCTextureCache sharedTextureCache] addImage:@"stars.png"];
        emitter.position    =   ccp( 240, 160 );
        [self addChild:emitter];

    }
    return self;
}
-(BOOL) ccTouchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self ccTouchesMoved:touches withEvent:event];
    return YES;
}
-(BOOL) ccTouchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
    UITouch *myTouch    =   [touches anyObject];
    CGPoint location    =   [myTouch locationInView:[myTouch view]];
    CGPoint point       =   [[CCDirector sharedDirector] convertToGL:location];
    emitter.position    =   ccp(point.x , point.y);
    return YES;
}

And Here is the Screen shot:

Here is i want to need:

1-I want to change the direction of effect( Means flame move upward but i want downward).

2-I want to change the color of flame.

Please help if you can.....

Answer 1

1) A quick look at the particle system documentation gives you either angle or gravity to play with - try setting these to different values i.e.

emitter.angle = <the angle you want>

2) Edit stars.png to be the colour you want?