''' Purpose: support image mirroring transformation
'''

def size( original ) :
    ''' Purpose: return the size of the new image when performing a mirroring
    '''

    nw, nh = original.size

    return (nw, nh)

def color( opixel ) :
    ''' Purpose: return the new pixel when performing a mirroring transformation
    '''

    npixel = opixel

    return npixel

def where( nspot, original = None ) :
    ''' Purpose: return the correspondent of nspot in the original when
            doing a mirroring
    '''

    nw, nh = original.size # get the width and height of the image
    # We want to plot our coordinates differently!
    nx, ny = nspot # This is the x and y in the new image
                   # This spot is nx from the left-hand side and ny down from the top
    oy = ny # We are going the same distance down from the top!
    ox = ( nw - 1 ) - nx   # In the original we are going x across from the left so now we want to go
    opixel = ( ox,oy )
    return opixel



if ( __name__ == '__main__' ) :

    import url
    from manip import manip

    # get web image of interest
    link = "http://www.cs.virginia.edu/~cs1112/images/mandrill/full.png"

    original = url.get_image( link )

    original.show()

    new_image = manip( original, size, color, where )

    new_image.show()