sprite setPosition dilema

Ok, i'm sure my problem is pretty easy, but what am I doing wrong. I'm trying to set the location of circles on a 2D plane, but I have to have different sized circles. I already have the code for changing the sizes setup, but I'm having trouble placing them in the correct location on the screen.
Here is the code that should place the center of the circle in the position entered:

for(i=0;i<levelList[lvlnum].numPlanets;i++){	//For every planet that exists
		planets.SetImage(&planet1img);																//Set the image
		planets.SetRefPixelPosition(0,0);
		planets.SetZoom((float)levelList[lvlnum].planetR/50);											//Set the zoom 
		planets.SetPosition(levelList[lvlnum].planetX-levelList[lvlnum].planetR,levelList[lvlnum].planetY-levelList[lvlnum].planetR);	//Set the position
		manager.Append(&planets);																	//Add to the layer manager
	}

planetX, and planetY are supposed to be the center of the circle, and planetR is the radius. The original radius is 50, and what the SetPosition line does is take the X value, which would place by the top left, and subtracting the radius from both the X and the Y values, which in theory would place it in the correct location.
any help is appriciated

nevermind...



Edited 1 time(s). Last edit at 05/05/2010 02:32PM by mdbrim.

Ok, I think I could figure it out if I got the position that the planets were actually being drawn to. Is there a way to get the number of pixels away from the center a sprite is. Right now I am using 320-getX(), which doesn't work because the sprite is technically being displayed at 320,240.

Ok I figured it out, dophin wasn't displaying the location of the sprites right, but it works fine on the wii.



Edited 1 time(s). Last edit at 05/11/2010 06:25AM by g_man.