''' Purpose: implement reflect.py
'''

from PIL import Image

def loc( img, spot ) :
    ''' If image coordinate spot lies on the lefthand side of img, the
                function returns spot.
        Otherwise,
            the function returns the reflection location of spot with respect
            to the center axis of img
    '''


def create_reflection( original ) :
    ''' The function makes use of loc() in returning a new image whose left side is
        that of original and whose right is a reflection of the left side.
    '''

    ow, oh = original.size                       # get dimensions of original
    nw, nh = ow, oh                              # new image has same dimensions

    new_image = Image.new( 'RGB', ( nw, nh ) )   # create new image

    for nx in range( 0, nw ) :                   # fill in every pixel of new image
        for ny in range( 0, nh ) :

            nspot = (nx, ny )                    # set spot to be filled in new image

            ospot = loc( original, nspot )       # determine corresponding spot in original

            opixel = original.getpixel( ospot )  # get pixel at corresponding spot

            npixel = opixel                      # use that pixel for the new image

            new_image.putpixel( nspot, npixel )  # set spot in new image

    return new_image                             # return reflection

if ( __name__ == '__main__' ) :

    import url

    TEST_URL = "http://www.cs.virginia.edu/~cs1112/images/coloring-book/crayoned-girl-and-dog.png"

    original = url.get_image( TEST_URL )

    result   = create_reflection( original )

    result.save( "reflect-girl-dog.png" )