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

# We want to define functions to manipulate dimensions, color, and locations of spots.
# We know that to blue an image, it's going to be the same dimension and all the spots
# (x,y) coordinates will be at the same locations! BUTTT the color will be different!
# So the only thing that will change is that we will change the colors to blues.
def size( original ) :
    ''' Purpose: return the size of the new image when performing a bluing
    '''

    nw, nh = original.size

    return (nw, nh)


def color( opixel ) :
    ''' Purpose: return the new pixel when performing a bluing of opixel
    '''

    # We want to take the original pixel color (r,g,b) and only use the b (the blue value)
    # Recall a pixel is a tuple (r,g,b) so opixel is a color in our image (r,g,b)

    # Remember doing r,g,b = opixel is kinda like how we could do
    # a,b = [1,2] -> the variable a gets the 1 and the variable b gets the 2
    # so opixel is (r,g,b) tuple that are ACTUAL VALUES like (24,52,240) and we can simply
    # assign r to the 24 g to the 52 and b to the 240
    # We're just taking the values from the original tuple and assigning them to these variables!
    # opixel is a single color.
    r,g,b = opixel # Extract r,g,b from the opixel passed in!
    npixel = ( 0, 0, b ) # Use the b value from the original pixel
    return npixel

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

    ospot = nspot

    return ospot

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()