''' Purpose: support image bluing transformation
'''

# This module defines the size, color, and where functions to manipulate the new image
# based on the old
# size deals with dimensions (w,h) - Manages the new image width and height
# color deals with the pixels in the image (r,g,b) - Manages the color changes for the pixels
# where deals with the spots in the image (x,y) - Manages the spots in the image where pixels are placed
def size( original ) :
    ''' Purpose: return the size of the new image when performing a bluing
    '''

    nw, nh = original.size # Extract the width and height from the original by defining it as
                           # w,h = original.size since original.size hands back (w,h) of the original image

    return (nw, nh)


def color( opixel ) :
    ''' Purpose: return the new pixel when performing a bluing of opixel
    '''
    # This function will change the pixels (the colors for all of the pixels in the image
    # in the same spots in the orignial)
    r, g, b = opixel # Recall that opixel passed in is a (r,g,b) pixel
                     # A tuple is a collection that uses parentheses so (r,g,b) is a tuple
                    # An (r,g,b) pixel defines how much red, how much green, and how much blue
                    # there is in a color (pixel) and so the min amount for red, green, and blue
                    # is 0 and the max amount is 255

    nr = 0  # Use no red
    ng = 0  # Use no green
    nb = b  # Use just the blue amount from the original pixel
    npixel = ( nr, ng, nb ) # Define a new pixel using (0,0,b) where b was the original blue pixel amount
    return npixel # The new pixel is going to be just the original blue amount
    pass

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

    ospot = nspot   # We just want to return the original spot passed in and use that spot

    return ospot    # The coordinates stay the same here for the images

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 )

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

    new_image.show()