Revision as of 13:48, 15 April 2018

D. Thiebaut (talk) 10:44, 15 April 2018 (EDT)

Problem 1: Class Inheritance in a Graphic Context

GenericCar Class

This class will be our super class. Create a new program called genericCar.py with the code below:

# genericCar.py
# Your name here
#
# A module containing the definition for a graphic car with
# a rectangular body and two wheels.
from graphics import *
from random import *

class GenericCar:
    """Definition for a car with a body and two wheels"""

    def __init__(self, win, topLeft, width, height ):
        """constructs a car made of 1 rectangle with top-left
        point topLeft, dimension width x height, and two wheels
        away from left and right by 10 pixesl"""
        # save width and height of car
        self.width = width
        self.height = height
        
        # create bottom-right point
        x1 = topLeft.getX()
        y1 = topLeft.getY()
        P2 = Point( x1+width, y1+height )

        # body is a rectangle between topLeft and P2
        self.body = Rectangle( topLeft, P2 )
        self.body.setFill( "yellow" )

        # create wheel #1
        center1 = Point( x1+20, y1+height )
        self.wheel1 = Circle( center1, 20 )
        self.wheel1.setFill( "black" )

        # create wheel #2
        center2 = Point( x1+width-20, y1+height )
        self.wheel2 = Circle( center2, 20 )
        self.wheel2.setFill( "black" )

        # create random speed
        self.dx = randrange( -3, 3 )

        # save window width (so that a car can detect
        # that it's going outside the left or right
        # margins)
        self.windowWidth = win.getWidth()

    def setSpeed( self, sp ):
        '''sets the horizontal speed to sp.  Positive values will make
        the car go to the right.  Negative, to the left.'''
        self.dx = sp
        
    def setFill( self, color ):
        '''sets the color of the body of the car'''
        self.body.setFill( color )
        
    def draw( self, win ):
        """draw the car on the window"""
        self.body.draw( win )
        self.wheel1.draw( win )
        self.wheel2.draw( win )
            
    def move( self ):
        """move the body and wheels of the car by dx"""
        self.body.move( self.dx, 0 )
        self.wheel1.move( self.dx, 0 )
        self.wheel2.move( self.dx, 0 )

Main Module

Create another Python program called manyCars.py that will import the GenericCar module, and create a generic car:

# manyCars.py
# A program that use a generic car instantiated from
# the GenericCar class.

from genericCar import *
from graphics import *
WIDTH  = 700
HEIGHT = 500

def main():
    # open a graphic window
    win = GraphWin( "Cars Cars Cars", WIDTH, HEIGHT )

    # create a generic car, draw it, set its speed
    # and set its color to blue
    car = GenericCar( win, Point( 100, 100 ), 200, 50 )
    car.draw( win )
    car.setSpeed( -1.5 )
    car.setFill( "blue" )

    # keep on moving the car until the user clicks the mouse
    while win.checkMouse()==None:
        car.move( )

    # close the graphic window        
    win.close()

main()

Save your files in the same directory.
Run manyCars.py. Make sure your blue car moves out of the window. If your car is too fast, change the speed to 0.15.
Create a second generic car, at a different location in the window, with a different color and a positive speed.
Make sure your program still runs correctly.

Creating A Derived Class: TaxiClass

A taxi is a car with special features. In our case, its color will always be yellow (even if the user tries to change it to something else,) and it has the word T A X I printed on its side.

Edit the genericCar.py program, and add the following definition, at the bottom (below the GenericCar class):

class Taxi( GenericCar ):
   '''A class derived from the GenericCar class, with
   a yellow body, and the word "TAXI" on the side of its
   body.'''
   def __init__( self, win, topLeft, width, height ):
      super().__init__( win, topLeft, width, height )
      x = (self.body.getP1().getX() + self.body.getP2().getX() )//2
      y = (self.body.getP1().getY() + self.body.getP2().getY() )//2
      self.label = Text( Point( x, y ), "T A X I" )

Draw method

Add a draw() method to your taxi. It will call the draw() method of the super class (see how __init__() calls the __init__() constructor of the super class, and do the same for draw(). Your draw() method needs to call draw() of the super class to draw the body and wheels, and it needs to draw the self.label.
Save genericCar.py after your edit is done.
Modify manyCars.py and add a taxi object, instantiated from your new Taxi class. Mirror what you did with your first two cars, creating the taxi, setting its color to, say, "lightblue", drawing the taxi, and moving the taxi.
Run manyCars.py, and observe that some things are not quite working well...

Move method

You will have noticed that the default move method from the GenericClass needs to be overloaded, because it does more the car and the wheels, but not the "TAXI" label. Create a new move() method for your Taxi:

   def move( self ):
      super().move()
      self.label.move( self.dx, 0 )

Run manyCars.py again, and verify that your label now moves with the car.

setFill method

Make sure your manyCars.py program sets the color of your taxi to some color other than yellow. You will have noticed that your taxi gets painted that color, and not the default yellow we'd like for all our taxis. So you need to overload the setFill() method of Taxi so that it sets the color to "yellow," no matter what color the main program tries to set.
You may also set the color of the taxi in the constructor, to be safe.
Run manyCars.py again, and verify that your taxi now is yellow and that its label move with the body.

Creating a second derived class: CarWithTop

Using the same approach you did when you created your Taxi class, create a new class derived from GenericCar, and call it CarWithTop. This class will be used to create cars that have GenericCar as a super class, but that sport a top (see the pink car in the image at the top of this page).

Go ahead and create the class CarWithTop, with

a constructor
whatever other methods are required for the car to move nicely across the graphic window.

Add a new object of type CarWithTop to your manyCars.py module.
Verify that all cars are moving smoothly across the graphic window.

Problem 2: Aquarium

Point your browser to this page and drag the tank image and a couple fish images to your desktop.

Write a new program called lab11_2.py and copy/paste the following code in it:

# lab11_2.py
# Displays fish in an aquarium

from graphics import *
import random

WIDTH  = 700   # geometry of the tank2.gif file
HEIGHT = 517

        
def main():
    # open the window
    win = GraphWin( "CSC Aquarium", WIDTH, HEIGHT )

    # display background image
    background = Image( Point( WIDTH//2, HEIGHT//2 ), "tank2.gif" )
    background.draw( win )

    # display the image of a fish at a random location
    fish = Image( Point( random.randrange( WIDTH),
                         random.randrange( HEIGHT) ),
                  "fish0.gif" )
    fish.draw( win )

    # close window when user clicks it
    win.getMouse()
    win.close()
    
main()

Create a new class called Fish.
Include a constructor that received the name of the gif file for the fish.
Include a member variable in the class to hold the image (Image class in graphics.py) of the fish.
Add a draw() method to the class, that will allow the main program to have the fish draw itself on the graphic window (win).
Add a moveRandom() method to the class, that will move the image of the fish some random deltaX and deltaY on the graphic window. Reminder: user random.randrange( 10 ) to generate a random number between 0 and 10, and use random.randrange( -10, 0 ) to generate a random number between -10 and 0 (not included).
Modify the main program so that it simply creates and displays a fish object, as shown below:

def main():
    # open the window
    win = GraphWin( "CSC Aquarium", WIDTH, HEIGHT )

    # display background
    background = Image( Point( WIDTH//2, HEIGHT//2 ), "tank2.gif" )
    background.draw( win )

    # display a fish
    fish = Fish( "fish0.gif" )
    fish.draw( win )

    win.getMouse()
    win.close()

When your code works, and only then, add a loop to make the fish move:

def main():
    # open the window
    win = GraphWin( "CSC Aquarium", WIDTH, HEIGHT )

    # display background
    background = Image( Point( WIDTH//2, HEIGHT//2 ), "tank2.gif" )
    background.draw( win )
 
    # display a fish
    fish = Fish( "fish0.gif" )
    fish.draw( win )

    # animation loop
    while win.checkMouse() == None:
        fish.moveRandom()

    win.getMouse()
    win.close()

Modify the moveRandom() method so that the fish disappears from the graphics window, it is moved back on the other side of the aquarium.
Create a list of 10 fish with the "fish0.gif" image, and add 10 fish with the "fish20.gif" image (or some fish that is headed in the opposite direction).
Modify the Fish class so that you can define the direction a fish goes into when you create it.
Verify that the fish swim in the correct direction.
Demonstrate your program to the lab instructor or a TA when you're done.

List of Lists

Demonstration Example

Create a new new program called Lab11_demo.py and copy the code from this program .
Carefully read the program to see what it does, and how it does it.
Run the program to verify that it works well.
Edit the text variable, and make it contain only 5 lines of text (it doesn't matter what countries you pick).
Run your program again and verify that the "top-10" and "last-10" sections still work and do not crash, even though the list contains fewer than 10 tuples.
Using a similar approach, solve the next two problems.

Problem 3: Animals

The text below contains names of animals and their speed, expressed in miles per hour. Write a Python program called Lab11_3.py (no need to write classes for this problem) based on the preparation problem above, and make your program output the following quantities:

The list of all the animals ranked by speed. Fastest first.
The 10 fastest animals listed in order of decreasing speed
The 10 slowest animals listed in order of increasing speed
The ratio of the speeds of the fastest animal versus that of the slowest animal. For example, if the speed of the fastest animal is 50 and the speed of the slowest is 2, then the program should output that the fastest animal is 25 times faster than the slowest one.
The list of all the animals (just their name, not their speed) that are faster than a human being ("human" is one of the species listed). Your program should not contain the number 27.9, which is the speed of a human. Instead it should find this number by looking up "human" in one of your lists and get the speed associated for the human.

Black Mamba Snake 20.0 mph 
Cape Hunting Dog 45.0 mph 
Cat (domestic) 30.0 mph 
Cheetah 70.0 mph 
Chicken 9.0 mph 
Coyote 43.0 mph 
Elephant 25.0 mph 
Elk 45.0 mph 
Giant Tortoise 0.2 mph 
Giraffe 32.0 mph 
Gray Fox 42.0 mph 
Greyhound 39.4 mph 
Grizzly Bear 30.0 mph 
Human 27.9 mph 
Hyena 40.0 mph 
Jackal 35.0 mph 
Lion 50.0 mph 
Mongolian Wild Ass 40.0 mph 
Mule Deer 35.0 mph 
Pig (domestic) 11.0 mph 
Pronghorn Antelope 61.0 mph 
Quarter Horse 47.5 mph 
Rabbit (domestic) 35.0 mph 
Reindeer 32.0 mph 
Six-Lined Racerunner 18.0 mph 
Spider (Tegenaria atrica) 1.2 mph 
Squirrel 12.0 mph 
Thomson's Gazelle 50.0 mph 
Three-Toed Sloth 0.1 mph
Warthog 30.0 mph 
Whippet 35.5 mph 
White-Tailed Deer 30.0 mph 
Wild Turkey 15.0 mph 
Wildebeest 50.0 mph 
Zebra 40.0 mph

Problem 4: Presidents

Below is a CSV list (coma-separated values) of past presidents. Using similar Python code as you have used for the previous problem, write a program (Lab11_4.py) that will process this list and output:

the list of presidents sorted alphabetically. Your program should simply print the names, one per line. No additional information is required.
the list of all the presidents who were associated with the democratic party.
the person who was president in 1945.
the presidents whose home state was Massachusetts.

Presidency ,President, Took office ,Left office ,Party , Home State
1, George Washington, 30/04/1789, 4/03/1797, Independent, Virginia
2, John Adams, 4/03/1797, 4/03/1801, Federalist, Massachusetts
3, Thomas Jefferson, 4/03/1801, 4/03/1809, Democratic-Republican, Virginia
4, James Madison, 4/03/1809, 4/03/1817, Democratic-Republican, Virginia
5, James Monroe, 4/03/1817, 4/03/1825, Democratic-Republican, Virginia
6, John Quincy Adams, 4/03/1825, 4/03/1829, Democratic-Republican/National Republican, Massachusetts
7, Andrew Jackson, 4/03/1829, 4/03/1837, Democratic, Tennessee
8, Martin Van Buren, 4/03/1837, 4/03/1841, Democratic, New York
9, William Henry Harrison, 4/03/1841, 4/04/1841, Whig, Ohio
10, John Tyler, 4/04/1841, 4/03/1845, Whig, Virginia
11, James K. Polk, 4/03/1845, 4/03/1849, Democratic, Tennessee
12, Zachary Taylor, 4/03/1849, 9/07/1850, Whig, Louisiana
13, Millard Fillmore, 9/07/1850, 4/03/1853, Whig, New York
14, Franklin Pierce, 4/03/1853, 4/03/1857, Democratic, New Hampshire
15, James Buchanan, 4/03/1857, 4/03/1861, Democratic, Pennsylvania
16, Abraham Lincoln, 4/03/1861, 15/04/1865, Republican/National Union, Illinois
17, Andrew Johnson, 15/04/1865, 4/03/1869, Democratic/National Union, Tennessee
18, Ulysses S. Grant, 4/03/1869, 4/03/1877, Republican, Ohio
19, Rutherford B. Hayes, 4/03/1877, 4/03/1881, Republican, Ohio
20, James A. Garfield, 4/03/1881, 19/09/1881, Republican, Ohio
21, Chester A. Arthur, 19/09/1881, 4/03/1885, Republican, New York
22, Grover Cleveland, 4/03/1885, 4/03/1889, Democratic, New York
23, Benjamin Harrison, 4/03/1889, 4/03/1893, Republican, Indiana
24, Grover Cleveland, 4/03/1893, 4/03/1897, Democratic, New York
25, William McKinley, 4/03/1897, 14/9/1901, Republican, Ohio
26, Theodore Roosevelt, 14/9/1901, 4/3/1909, Republican, New York
27, William Howard Taft, 4/3/1909, 4/03/1913, Republican, Ohio
28, Woodrow Wilson, 4/03/1913, 4/03/1921, Democratic, New Jersey
29, Warren G. Harding, 4/03/1921, 2/8/1923, Republican, Ohio
30, Calvin Coolidge, 2/8/1923, 4/03/1929, Republican, Massachusetts
31, Herbert Hoover, 4/03/1929, 4/03/1933, Republican, Iowa
32, Franklin D. Roosevelt, 4/03/1933, 12/4/1945, Democratic, New York
33, Harry S. Truman, 12/4/1945, 20/01/1953, Democratic, Missouri
34, Dwight D. Eisenhower, 20/01/1953, 20/01/1961, Republican, Texas
35, John F. Kennedy, 20/01/1961, 22/11/1963, Democratic, Massachusetts
36, Lyndon B. Johnson, 22/11/1963, 20/1/1969, Democratic, Texas
37, Richard Nixon, 20/1/1969, 9/8/1974, Republican, California
38, Gerald Ford, 9/8/1974, 20/01/1977, Republican, Michigan
39, Jimmy Carter, 20/01/1977, 20/01/1981, Democratic, Georgia
40, Ronald Reagan, 20/01/1981, 20/01/1989, Republican, California
41, George H. W. Bush, 20/01/1989, 20/01/1993, Republican, Texas
42, Bill Clinton, 20/01/1993, 20/01/2001, Democratic, Arkansas
43, George W. Bush, 20/01/2001, 20/01/2009, Republican, Texas

Moodle Submission

Demonstrate the correct behavior of your aquarium to your lab instructor. Submit your solution program for the presidents problem on Moodle, in the Lab11 PB4 section.

<showafterdate after="201800420 12:00" before="20180601 00:00">

Solution Programs

genericCar.py

from graphics import *
from random import *

class GenericCar:
    """Definition for a car with a body and two wheels"""

    def __init__(self, win, topLeft, width, height ):
        """constructs a car made of 1 rectangle with top-left
        point topLeft, dimension width x height, and two wheels
        away from left and right by 10 pixesl"""
        # save width and height of car
        self.width = width
        self.height = height
        
        # create bottom-right point
        x1 = topLeft.getX()
        y1 = topLeft.getY()
        P2 = Point( x1+width, y1+height )

        # body is a rectangle between topLeft and P2
        self.body = Rectangle( topLeft, P2 )
        self.body.setFill( "yellow" )

        # create wheel #1
        center1 = Point( x1+20, y1+height )
        self.wheel1 = Circle( center1, 20 )
        self.wheel1.setFill( "black" )

        # create wheel #2
        center2 = Point( x1+width-20, y1+height )
        self.wheel2 = Circle( center2, 20 )
        self.wheel2.setFill( "black" )

        # create random speed
        self.dx = randrange( -3, 3 )

        # save window width (so that a car can detect
        # that it's going outside the left or right
        # margins)
        self.windowWidth = win.getWidth()

    def setSpeed( self, speed ):
        self.dx = speed
        
    def setFill( self, color ):
        '''sets the color of the body of the car'''
        self.body.setFill( color )
        
    def draw( self, win ):
        """draw the car on the window"""
        self.body.draw( win )
        self.wheel1.draw( win )
        self.wheel2.draw( win )
            
    def move( self ):
        """move the body and wheels of the car by dx"""
        self.body.move( self.dx, 0 )
        self.wheel1.move( self.dx, 0 )
        self.wheel2.move( self.dx, 0 )

class Taxi( GenericCar ):
   '''A class derived from the GenericCar class, with
   a yellow body, and the word "TAXI" on the side of its
   body.'''
   def __init__( self, win, topLeft, width, height ):
      super().__init__( win, topLeft, width, height )
      x = (self.body.getP1().getX() + self.body.getP2().getX() )//2
      y = (self.body.getP1().getY() + self.body.getP2().getY() )//2
      self.label = Text( Point( x, y ), "T A X I" )

   def draw( self, win ):
     super().draw( win )
     self.label.draw( win )

   def move( self ):
      super().move()
      self.label.move( self.dx, 0 )
      

   def setFill( self, color ):
     return

   
class CarWithTop( GenericCar ):
   def __init__(self, win, topLeft, width, height ):
     super().__init__( win, topLeft, width, height )
     x1 = topLeft.getX()+20
     y1 = topLeft.getY()
     x2 = topLeft.getX()+self.width-20
     y2 = topLeft.getY()-30
     self.top = Rectangle( Point( x1, y1 ), Point( x2, y2 ) )
     
   def draw( self, win ):
     super().draw( win )
     self.top.draw( win )

   def setFill( self, color ):
     super().setFill( color )
     self.top.setFill( color )

   def move( self ):
     super().move()
     self.top.move( self.dx, 0 )

manyCars.py

# ManyCars.py
# A program that uses many different classes
# of cars, inherited from the GenericCar super
# class.
from genericCar import *
from graphics import *
WIDTH  = 700
HEIGHT = 500
def main():
    # open a graphic window
    win = GraphWin( "Cars Cars Cars", WIDTH, HEIGHT )

    # create a generic car, draw it, set its speed
    # and set its color to blue
    car = GenericCar( win, Point( 100, 100 ), 200, 50 )
    car.draw( win )
    car.setSpeed( -1.5 )
    car.setFill( "blue" )

    taxi = Taxi(  win, Point( 150, 200 ), 200, 50 )
    taxi.draw( win )
    taxi.setSpeed( 1.5 )
    taxi.setFill( "lightblue" )
    # keep on moving the car until the user clicks the mouse
    
    while win.checkMouse()==None:
        car.move( )
        taxi.move( )
        
    # close the graphic window        
    win.close()

main()

</showafterdate>

Difference between revisions of "CSC111 Lab 11 2018"

Revision as of 13:48, 15 April 2018

Contents

Problem 1: Class Inheritance in a Graphic Context

GenericCar Class

Main Module

Creating A Derived Class: TaxiClass

Draw method

Move method

setFill method

Creating a second derived class: CarWithTop

Problem 2: Aquarium

List of Lists

Demonstration Example

Problem 3: Animals

Problem 4: Presidents

Moodle Submission

Solution Programs

genericCar.py

manyCars.py

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