// set the contents of a matrix so that it performs no transformation

    SetIdentityMatrix( &matrix );

    // modify the contents of a matrix so that it defines a rotation operation

    // 90 degrees to the right - anchor at 0.0 top-left 

    RotateMatrix( &matrix,          // pointer to the matrix structure

                  Long2Fix( 90 ),   // the number of degrees of rotation NOTE: THIS IS A FIXED VALUE

                  0,                // x coordinate of anchor point

                  0 );              // y coordinate of anchor point

    // we need to return the top-left corner of the rotated image back to it's

    // origin, so add a translation value to a specified matrix 

    TranslateMatrix( &matrix,                           // pointer to the matrix structure

                     Long2Fix( naturalBounds.bottom ),  // deltaH - value added to the x coordinate NOTE: FIXED VALUES

                     0 );                               // deltaV - value added to the y coordinate 

    // set the transformation matrix to use for drawing an image             

    err = GraphicsImportSetMatrix( importer, &matrix );