CSC111 Lab 12 2014

--D. Thiebaut (talk) 18:47, 21 April 2014 (EDT)

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Building a car using the Graphics111 library

• Get a copy of the graphics111.py library
• Save it in your main directory (where you keep you python programs) and save it as graphics111.py
• Create a car using the new classes now available in the graphics111 library. Call it lab12.py.

from graphics111 import *

MAXWIDTH  = 600
MAXHEIGHT = 400

class Car:
    def __init__(self, x, y, w, h, color ):
        self._body = Rectangle( x, y, w, h, color )
        self._w1   = Wheel( x+w//4, y+h, w//4 )
        self._w2   = Wheel( x+3*w//4, y+h, w//4 )
        
    def draw( self, canvas ):
        self._body.draw( canvas )
        self._w1.draw( canvas )
        self._w2.draw( canvas )
        
def main():    
    win = GraphicsWindow(MAXWIDTH, MAXHEIGHT)
    canvas = win.canvas()

    p1 = Car( 100, 100, 50, 20, (250, 250, 0) )
    p1.draw( canvas )

    win.wait()
    win.close()

main()

• Notice how short the program is now that the classes for the wheels and rectangles are in the graphics111 library!

Adding A Menu

• Add a menu at the top left of the window. Don't try to activate it, it won't respond yet...

from graphics111 import *

MAXWIDTH  = 600
MAXHEIGHT = 400
class Car:
    def __init__(self, x, y, w, h, color ):
        self._body = Rectangle( x, y, w, h, color )
        self._w1   = Wheel( x+w//4, y+h, w//4 )
        self._w2   = Wheel( x+3*w//4, y+h, w//4 )
        
    def draw( self, canvas ):
        self._body.draw( canvas )
        self._w1.draw( canvas )
        self._w2.draw( canvas )
        
def main():
    win = GraphicsWindow(MAXWIDTH, MAXHEIGHT)
    canvas = win.canvas()

    menu = Menu()
    menu.draw( canvas )
    
    p1 = Car( 100, 100, 50, 20, (250, 250, 0) )
    p1.draw( canvas )

    win.wait()
    win.close()

main()

A Bit of Hacking

• Figure out where the menu is located in the graphics111.py program, and change its color to red. All the symbols should show up in red when your modification is over.