BTH000留学生代做、Python编程语言调试、Python代写、代做turtle race

日期：2019-04-25 10:52

Assignment 2 – Object oriented turtle race

Course: BTH000 Python Programming I

1 Introduction

The purpose of the assignment is for you to demonstrate that you grasp the

basics in object oriented modeling and that you master to put together a

Python program with a few user defined classes and objects.

2 Task –Turtle Race

The task is to implement a game where a couple of people can register for

the race by inputting their name and their favourite color. Thereafter each

player get a turtle with the chosen color, and the turtles compete against each

other in a race from a start line to a goal line. Use the turtle graphics package

to make the turtles and the race track visible on the screen. Use the object

oriented concept to design your program. You shall implement at least two

different classes in this assignment. One for the player and one for the race

game itself.

This is what a run of the race might look like:

Figure 1: Game setup

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Figure 2: Game running

Figure 3: Present result

2.1 class Player

Your Player class should at least have the following private attributes:

a name

a color

a start position

a Turtle object initiated to the chosen color and correct start position

You are free to add more attributes if you need to. You could for example

have a variable with a number keeping track of if the moving method should

actually move the turtle forward. We do not want it to keep moving out of

the window after it reached the goal line. If you choose to implement such an

attribute it will probably be convenient to implement a getter method corresponding

to the attribute. The class should also have a class variable to keep

track of how many players that have registered to the game so far. This class

variable can be used to calculate the start position for the current turtle when

creating a new Player object.

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The constructor shall take two input parameters, the name and the color.

At least methods for the following shall be implemented within the class:

a method to move the turtle forward a random amount of pixels

a getter method that returns the name

a getter method that returns the color

a method writing the name in text beside the start position

2.2 class Game

Your Game class should at least have the following private attributes:

a list with the players

a list representing the game result (can also be a list with players ordered

after race outcome)

At least methods for the following shall be implemented within the class:

a method that draws the race track on the screen (a start line and a goal

line)

a method that registers the players (take name and color as interactive

input, create player object and add to the player list )

a method checking if the race is over (all turtles have stopped)

the race itself, i.e. moving the players repeatedly until the race is over

a method presenting a list of the race result

2.3 Race track

Constants defining the race track bounds may be defined globally and known

by all classes and methods/functions.

2.4 Script to run the race

Write a script that creates a Game object and calls its registering method, race

method and result presenting method.

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2.5 Turtle graphics

The following methods within the turtle package can be useful. There is a full

description of all turtle methods on python.org:

https://docs.python.org/3.3/library/turtle.html?highlight=turtle.

forward(distance)

Move the turtle forward by the specified distance, in the direction the turtle

is headed.

Parameters:

distance – a number (integer or float)

left(angle)

Turn turtle left by angle degrees.

right(angle)

Turn turtle right by angle degrees.

setpos(x, y=None)

Move turtle to an absolute position.

Parameters:

x - a number or a pair/vector of numbers,

y - a number or None

xcor()

Return the turtle’s x coordinate.

pendown()

Pull the pen down – drawing when moving.

penup()

Pull the pen up – no drawing when moving.

color(name)

Among other things it sets the turtle color to the one specified by name.

Parameters:

name – a string which is a valid color name. Valid color names can be found

here: http://www.science.smith.edu/dftwiki/index.php/Color Charts for TKinter

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write(arg)

Write text - the string representation of arg- at the current turtle position

according to align (’left’, ’center’ or ’right’)

hideturtle()

Make the turtle invisible.

showturtle()

Make the turtle visible.

shape(name=None)

Set turtle shape to shape with given name.

Parameters:

name – a string which is a valid shape name. Valid shape names are: ’turtle’,

’arrow’, ’circle’, ’square’, ’triangle’, ’classic’

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