[vtkusers] Tcl conversion to C++

[lappadj at libero.it]

Hi,
i want to convert the segmented16.tcl script in c++ language,but i don't 
know the corrisondence with command in tcl!
e.g.

set originx [expr ( $COLUMNS / 2.0 ) * $PIXEL_SIZE * -1.0]
set originy [expr ( $ROWS / 2.0 ) * $PIXEL_SIZE * -1.0]
vtkImageReader reader;
    eval reader SetFilePrefix $STUDY
You know the corrisondence?Or you know a site with explanation about it?
Thanks a lot 

Massimiliano La Paglia