Rotation Container's margin

gistfile1.txt

public void SetImages(String[] Images)
        { 
            if (visibleItems > itemsAmount)
                return;

            // cleaning up
            if (rotationContainer!=null)
                rotationContainer.Children.Clear();

            positions.Clear();
            currentIndex = 0;

            //TODO: REMOVE THIS CODE, as this will override your set Images
            Images = new String[itemsAmount];
            for (int i = 0; i < itemsAmount; i++)
            {    
                Images[i] = (String.Format(@"Images\{0}.png", i));
            } 
            //TODO: REMOVE THIS CODE 

            RotateTransform rt = new RotateTransform() { CenterX = r, CenterY = r };
            rotationContainer = new Grid()
            {
                Width = 2 * r,
                Height = 2 * r,
                RenderTransform = rt, 
                Margin = new Thickness(-4.8*r,0,0,0) 
            }; 

            LayoutRoot.Children.Add(rotationContainer);  

            Storyboard storyboard = new Storyboard();  
            for (int i = 0; i < visibleItems; i++)
            {
                BitmapImage bi = new BitmapImage(new Uri(Images[i], UriKind.Relative));  

                Image im = new Image() { Source = bi, Width = imageWidth, Height = imageHeight};
                im.RenderTransform = new TranslateTransform();
                rotationContainer.Children.Add(im);

                double xPos = 0, yPos = 0;
                if (visibleItems%2==1) //if odd
                {
                    xPos = r * Math.Sin((180 / (visibleItems + 1) * (i + 1)) * (Math.PI / 180));
                    yPos = -1 * r * Math.Cos((180 / (visibleItems + 1) * (i + 1)) * (Math.PI / 180));
                }
                else //if the items is even
                {
                    xPos = r * Math.Sin((180 / (visibleItems) * (i + 1)) * (Math.PI / 180));
                    yPos = -1 * r * Math.Cos((180 / (visibleItems) * (i + 1)) * (Math.PI / 180));
                }
                
                DoubleAnimation translateAnimationX = new DoubleAnimation()
                {
                    From = 0,
                    To = xPos
                };
                Storyboard.SetTarget(translateAnimationX, im);
                Storyboard.SetTargetProperty(translateAnimationX, new PropertyPath("(UIElement.RenderTransform).(TranslateTransform.X)"));
                storyboard.Children.Add(translateAnimationX);

                DoubleAnimation translateAnimationY = new DoubleAnimation()
                {
                    From = 0,
                    To = yPos
                };
                Storyboard.SetTarget(translateAnimationY, im);
                Storyboard.SetTargetProperty(translateAnimationY, new PropertyPath("(UIElement.RenderTransform).(TranslateTransform.Y)"));
                storyboard.Children.Add(translateAnimationY);

                positions.Add(new Point(translateAnimationX.To.Value, translateAnimationY.To.Value));

                im.Tag = i; 
            } 

            // create the rest
            for (int i= visibleItems;i<itemsAmount;i++)
            {
                BitmapImage bi = new BitmapImage(new Uri(Images[i], UriKind.Relative));

                Image im = new Image() { Source = bi, Width = imageWidth, Height = imageHeight };
                im.RenderTransform = new TranslateTransform();
                rotationContainer.Children.Add(im);

                double xPos = (-1) * r * Math.Sin((180 / (itemsAmount - visibleItems + 1) * (i-visibleItems + 1)) * (Math.PI / 180));
                DoubleAnimation translateAnimationX = new DoubleAnimation()
                {
                    From = 0,
                    To = xPos
                };
                Storyboard.SetTarget(translateAnimationX, im);
                Storyboard.SetTargetProperty(translateAnimationX, new PropertyPath("(UIElement.RenderTransform).(TranslateTransform.X)"));
                storyboard.Children.Add(translateAnimationX);

                DoubleAnimation translateAnimationY = new DoubleAnimation()
                {
                    From = 0,
                    To = r * Math.Cos((180 / (itemsAmount - visibleItems + 1) * (i - visibleItems + 1)) * (Math.PI / 180))
                };
                Storyboard.SetTarget(translateAnimationY, im);
                Storyboard.SetTargetProperty(translateAnimationY, new PropertyPath("(UIElement.RenderTransform).(TranslateTransform.Y)"));
                storyboard.Children.Add(translateAnimationY);

                positions.Add(new Point(translateAnimationX.To.Value, translateAnimationY.To.Value));

                im.Tag = i;

                im.Visibility = Visibility.Hidden; 
            }

            storyboard.SpeedRatio = Double.MaxValue;
            storyboard.Begin(); 
        }