screen functions

def create_screen(rows, columns):
    '''
    Creates a screen of rows x columns pixels
    '''
    grid = []
    for row in range(rows):
        grid.append([0] * columns)
    return grid


def print_screen(screen):
    ''' Prints the screen to the console.
        When a pixel == 0, then a '*' is displayed
        When a pixel == 1, then a ' ' is displayed
    '''
    for row in range(len(screen)):
        for col in range(len(screen[0])):
            if screen[row][col] == 0:
                print('*', end='')
            else:
                print(' ', end='')
        print()
    return

def doSomething(screen,x):

    for i in range(len(screen)):
        screen[i][x]=1

    return screen

def somethingElse(screen,x):
    for i in range(len(screen[0])):
        screen[x][i]=1


def drawThing(screen,ulrow,ulcol,lrrow,lrcol):

    for col in range(ulcol,lrcol+1):
        screen[ulrow][col]=1

    middleCol = (ulcol + lrcol)//2

    for row in range(ulrow,lrrow+1):
        screen[row][middleCol]=1

    return screen
        

def drawOtherThing(screen,ulrow,ulcol,lrrow,lrcol):

    for r in range(ulrow,lrrow+1):
        screen[r][ulcol]=1
    for r in range(ulrow,lrrow+1):
        screen[r][lrcol]=1
    for c in range(ulcol,lrcol+1):
        screen[ulrow][c]=1

    return screen

def drawReverseThing(screen,ulrow,ulcol,lrrow,lrcol):

    for r in range(ulrow,lrrow+1):
        screen[r][ulcol]=1
    for r in range(ulrow,lrrow+1):
        screen[r][lrcol]=1
    for c in range(ulcol,lrcol+1):
        screen[lrrow][c]=1

    return screen

def foo():
    s = create_screen(8,9)
    print_screen(doSomething(s,4))

def bar():
    s = create_screen(8,9)
    print_screen(somethingElse(s,4))

def baz():
    s = create_screen(8,9)
    somethingElse(s,4)
    print_screen(s)             
    
def gaucho():
    s = create_screen(8,9)
    print_screen(drawThing(s,1,2,6,5))
    
def isla():
    s = create_screen(8,9)
    print_screen(drawOtherThing(s,2,3,5,7))

def vista():
    s = create_screen(8,9)
    print_screen(drawReverseThing(s,2,3,5,7))