CSC111 List of Objects

--D. Thiebaut 09:36, 1 November 2011 (EDT)

---

# ListsAndLoops.py
# D. Thiebaut
# This program illustrates how to use lists to
# keep track of objects, and for loops to iterate
# through the objects
#
from graphics import *


def main():
    """ below is a very uninspiring main program that needs
    some attention.  It is inefficient.  Code is repeated for
    each of the 4 rectangles.  Run it to see that it creates
    an orange border around the graphic window"""
    w = 600
    h = 400
    win = GraphWin( "Lists and Loops", w, h )

    r1 = Rectangle( Point( 0, 0 ), Point( w, 10 ) )
    r1.setFill( "orange" )
    r1.setWidth( 0 )
    r1.draw( win )

    r2 = Rectangle( Point( 0, 0 ), Point( 10, h ) )
    r2.setFill( "orange" )
    r2.setWidth( 0 )
    r2.draw( win )

    r3 = Rectangle( Point( w, h ), Point( w-10, 0 ) )
    r3.setFill( "orange" )
    r3.setWidth( 0 )
    r3.draw( win )

    r4 = Rectangle( Point( w, h ), Point( 0, h-10 ) )
    r4.setFill( "orange" )
    r4.setWidth( 0 )
    r4.draw( win )

    win.getMouse()
    win.close()









#========================<<< ANOTHER VERSION >>>==========================



def main2():
    """This is the more efficient version of main().  It puts the
    rectangles in a list and uses a for loop to go through the
    rectangles and draw them with the right attributes"""
    w = 600
    h = 400
    win = GraphWin( "Lists and Loops", w, h )

    border = [ Rectangle( Point( 0, 0 ), Point( w, 10 ) ),
               Rectangle( Point( 0, 0 ), Point( 10, h ) ),
               Rectangle( Point( w, h ), Point( w-10, 0 ) ),
               Rectangle( Point( w, h ), Point( 0, h-10 ) ) ]

    for r in border:
        r.setFill( "orange" )
        r.setWidth( 0 )
        r.draw( win )

 
    win.getMouse()
    win.close()
       






#========================<<< ANOTHER VERSION >>>==========================


def drawBorder( win, x1, y1, x2, y2, x3, y3, x4, y4, x5, y5,
                     x6, y6, x7, y7, x8, y8, color):
    """gets the coordinates of 8 corner points and draws 4 rectangles
    between them to form a border.  The color of the border is passed
    as a parameter"""
    
    border = [ Rectangle( Point( x1, y1 ), Point( x2, y2 ) ),
               Rectangle( Point( x3, y3 ), Point( x4, y4 ) ),
               Rectangle( Point( x5, y5 ), Point( x6, y6 ) ),
               Rectangle( Point( x7, y7 ), Point( x8, y8 ) ) ]

    for r in border:
        r.setFill( color )
        r.setWidth( 0 )
        r.draw( win )

    
def main3():
    """The same version as in main2(), but this time we use a function
    to do most of the work"""
    w = 600
    h = 400
    win = GraphWin( "Lists and Loops", w, h )

    drawBorder( win, 0, 0, w, 10, 0, 0, 10, h, w, h, w-10, 0,
                w, h, 0, h-10, "magenta" )

    win.getMouse()
    win.close()




#========================<<< ANOTHER VERSION >>>==========================


def main4():
    """Creating multiple borders.  We parameterize the width of the rectangles
    and loop to create sevral borders overlapping each other"""
    w = 600
    h = 400
    win = GraphWin( "Lists and Loops", w, h )

    # bw is the border width, and we start with a larger border first,
    # going down to smaller ones, each border overlapping somewhat the
    # preceding one.
    for bw in [ 100, 80, 60, 40, 20, 10 ]:
        drawBorder( win, 0, 0, w, bw, 0, 0, bw, h, w, h, w-bw, 0,
                    w, h, 0, h-bw, color_rgb( bw, bw*2, 200-bw ) )

    win.getMouse()
    win.close()


main4()