# starter program for image manipulation program
#
# written by e.bonakdarian   nov 2009
#                  updated   mar 2010
#                  updated   nov 2010
#                  updated   jun 2011
#

import Image

# choices
QUIT = 0

DIAGONAL = 1
STRIPE_HORIZ = 2
STRIPE_VERTICAL = 3
COLOR_BLUE = 4



#####################################################
def Diag(img, pixel_color): 
    # put a diagonal line across the image in the
    # specified color
    #
    # *** ALREADY WORKING - PLEASE DO NOT MODIFY ***
    
    pix_ar = img.load() # load image into 2D array 
    cols = img.size[0]  # number of columns
    rows = img.size[1]  # number of rows


    for col in range(cols): # our nested loop     
        for row in range(rows):
            if row == col: 
                pix_ar[col, row] = pixel_color





#####################################################
def Stripe_H(img, pixel_color): 
    # put a line in the specified color across the 
    # image every other line.

    pix_ar = img.load() # load image into 2D array 
    cols = img.size[0]  # number of columns
    rows = img.size[1]  # number of rows

    print 'not finished'



#####################################################
def Stripe_V(img, pixel_color): 
    # put a line in the specified color down the 
    # image every other line.

    pix_ar = img.load() # load image into 2D array 
    cols = img.size[0]  # number of columns
    rows = img.size[1]  # number of rows

    print 'not finished'



#####################################################
def ColorIt_Blue(img):
    # set all the pixels to blue

    pix_ar = img.load() # load image into 2D array 
    cols = img.size[0]  # number of columns
    rows = img.size[1]  # number of rows

    print 'not finished'



#######################################################
def display_menu():
    # displays the menu, and returns the user selection

    print '\t========================================='
    print '\tMenu'
    print '\t========================================='
    print '\t1) Diagonal line'  #done for you
    print '\t2) Stripe horizontal (every other row)'
    print '\t3) Stripe vertical (every other column)'
    print '\t4) Color image solid blue'
    print '\t========================================='
    print '\t0) Quit'

    selection = input('\n\tEnter your choice: ')
    return selection




#######################################################
def main():
    # our main program

    choice = display_menu()

    if choice == QUIT:
        print 'Quitting program.'
    else:
        #load image
        im = Image.open('c:/esmail/pie.jpg')
        pixel_color = 255, 0, 0 # red RGB pixel
        
        if choice == DIAGONAL:
            Diag(im, pixel_color)
        elif choice == STRIPE_HORIZ:
            Stripe_H(im, pixel_color)
        elif choice == STRIPE_VERTICAL:
            Stripe_V(im, pixel_color)
        elif choice == COLOR_BLUE:
            ColorIt_Blue(im)
        else:
            print 'Error: Unknown choice: ', choice
        
        im.show()


if __name__ == '__main__':
    main()