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2024-04-07 作者:code


SWEN20003 Object Oriented Software Development Project 1, 2024
The University of Melbourne
School of Computing and Information Systems
SWEN20003 Object Oriented Software Development
Project 1, Semester 1, 2024
Released: Monday, 25th March 2024 at 11:30pm AEST
Initial Submission Due: Thursday, 28th March 2024 at 11:30pm AEST
Project Due: Wednesday, 17th April 2024 at 11:30pm AEDT
Please read the complete specification before starting on the project, because there
are important instructions through to the end!
Overview
Welcome to the first project for SWEN20003, Semester 1, 2024. Across Project 1 and 2, you
will design and create an arcade game in Java called ShadowMario (an adaptation of the original
90’s arcade game Super Mario Bros). In this project, you will create the first level of the full
game that you will complete in Project 2B. This is an individual project. You may discuss it
with other students, but all of the implementation must be your own work. By submitting the
project you declare that you understand the University’s policy on academic integrity and aware
of consequences of any infringement, including the use of artificial intelligence.
You may use any platform and tools you wish to develop the game, but we recommend using IntelliJ
IDEA for Java development as this is what we will support in class.
The purpose of this project is to:
• Give you experience working with an object-oriented programming language (Java),
• Introduce simple game programming concepts (2D graphics, input, simple calculations)
• Give you experience working with a simple external library (Bagel)
Extensions & late submissions: If you need an extension for the project, please complete the
Extension form in the Projects module on Canvas. Make sure you explain your situation with
some supporting documentation such as a medical certificate, academic adjustment plan, wedding
invitation, etc. You will receive an email saying if the extension was approved or if we need more
information.
If you submit late (either with or without an extension), please complete the Late form in the
Projects module on Canvas. For both forms, you need to be logged in using your university
account. Please do not email any of the teaching team regarding extensions or late submissions.
All of this is explained again in more detail at the end of this specification.
You must make at least 5 commits (excluding the Initial Submission commit) throughout the
development of the project, and they must have meaningful messages. This is also explained in
more detail at the end of the specification.
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SWEN20003 Object Oriented Software Development Project 1, 2024
Game Overview
“The aim is simple - move the player to jump over the enemies and collect the coins. Can you
reach the end flag to complete the level?
The game consists of three levels - Project 1 will only feature the first level. The player has
to press the arrow keys to move left, right or jump. The player can collect coins by colliding with
them - collecting one coin, increases the score by one. The player can avoid the stationary enemies
by jumping over them (the enemies will be moving in Project 2!). If the player collides with an
enemy, they will lose health points. To win, the player needs to reach the end flag. If the player’s
health points reduce to zero, the game ends.
Figure 1: Completed Project 1 Screenshot
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SWEN20003 Object Oriented Software Development Project 1, 2024
The Game Engine
The Basic Academic Game Engine Library (Bagel) is a game engine that you will use to develop
your game. You can find the documentation for Bagel here.
Coordinates
Every coordinate on the screen is described by an (x, y) pair. (0, 0) represents the top-left of the
screen, and coordinates increase towards the bottom-right. Each of these coordinates is called a
pixel. The Bagel Point class encapsulates this.
Frames
Bagel will refresh the program’s logic at the same refresh rate as your monitor. Each time, the
screen will be cleared to a blank state and all of the graphics are drawn again. Each of these steps
is called a frame. Every time a frame is to be rendered, the update() method in ShadowMario is
called. It is in this method that you are expected to update the state of the game.
The refresh rate is typically 120 times per second (Hz) but some devices might have a lower rate
of 60Hz. In this case, when your game is running, it may look different to the demo videos as
the constant values in this specification have been chosen for a refresh rate of 120Hz. For your
convenience, when writing and testing your code, you may change these values to make your game
playable (these changes are explained later). If you do change the values, remember to change
them back to the original specification values before submitting, as your code will be marked on
120Hz screens.
The Game Elements
Below is an outline of the different game elements you will need to implement.
Window and Background
The background (background.png) should be rendered on the screen and completely fill up your
window throughout the game. The default window size should be 1024 * 768 pixels. The background has already been implemented for you in the skeleton package.
Messages
All messages should be rendered with the font provided in the res folder (FSO8BITR.ttf). If not
otherwise specified, message coordinates should be roughly centered.
Hint: The drawString() method in the Font class uses the given coordinates as the bottom left
of the message. So to center the message, you will need to calculate the coordinates using the
Window.getWidth() and Window.getHeight() methods.
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SWEN20003 Object Oriented Software Development Project 1, 2024
Game Start
When the game is run, a title message that reads SHADOW MARIO should be rendered in the font
provided. The bottom left corner of this message should be located at (220, 250), in size 64.
Additionally, an instruction message consisting of 2 lines:
PRESS SPACE TO START
USE ARROW KEYS TO MOVE
should be rendered below the title message, in the font provided, in size 24. The bottom left of
the first line in the message should be calculated as follows: the x-coordinate should be centered
horizontally and the y-coordinate should be at 500 pixels.
There must be adequate spacing between the 2 lines to ensure readability (you can decide on
the value of this spacing yourself, as long as it’s not small enough that the text overlaps or too big
that it doesn’t fit within the screen).
Properties File
The key values of the game are listed in two properties files which are given in the skeleton package. The message coordinates, image filenames and other values are given in the app.properties
file. The message strings are given in the message en.properties file. These files shouldn’t be
edited (unless you need to adjust values for any frame rate issues).
To read a value from one of these properties, a Properties object must be created. The
getProperty method can be called on this object with the required value given as the parameter. For your reference, the skeleton package contains an example of how to read the background
image filename, window width and window height values.
World File
The entities will be defined in a world file, describing the type and their position in the window.
The world file is located at res/level1.csv. A world file is a comma-separated value (CSV) file
with rows in one of the following formats:
Type of entity, x-coordinate, y-coordinate
An example of a world file:
PLATFORM,3000,745
PLAYER,100,687
COIN,300,510
ENEMY,400,695
END_FLAG,4100,670
The given (x, y) coordinates refer to the centre of each image and these coordinates should be
used to draw each image. You must actually load it—copying and pasting the data, for example, is
not allowed. Marking will be conducted on a hidden different CSV file of the same format. Note:
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SWEN20003 Object Oriented Software Development Project 1, 2024
You can assume that there are 50 lines in the CSV and that there will always be at least one of
each for all the entities. You can also assume there are 14 enemies and 33 coins for Project 1.
Win Conditions
If the player reaches (collides with) the end flag, this is considered as a win. A winning message,
that consists of 2 lines:
CONGRATULATIONS, YOU WON!
PRESS SPACE TO CONTINUE
should be rendered, in the font provided, in size 24. The bottom left of the first line in the
message should be calculated as follows: the x-coordinate should be centered horizontally and the
y-coordinate should be at 400 pixels. If the space key is pressed, the game returns to the start
screen and allows the player to play again.
Lose Conditions
If the player’s health points reduces to 0 or below, this is considered as a loss and the game ends.
A message, that consists of 2 lines:
GAME OVER, YOU LOST!
PRESS SPACE TO CONTINUE
should be rendered, in the font provided, in size 24. The bottom left of the first line in the
message should be calculated as follows: the x-coordinate should be centered horizontally and the
y-coordinate should be at 400 pixels.
Once again if the space key is pressed, the game returns to the start screen and allows the player
to play again. If the player terminates the game window at any point (by pressing the Escape key
or by clicking the Exit button), the window will simply close and no message will be shown.
Game Entities
The following game entities have an associated image (or multiple!) and a starting location (x,
y). Remember that all images are drawn from the centre of the image using these coordinates.
Player
In our game, the player can move on screen in one of three directions (left, right and up) when the
corresponding arrow key is pressed. However, for our ease of implementation, we assume the player
can only move vertically and remains stationary in the horizontal direction (i.e. the other entities
will be moving in relation to the player’s arrow key pressed - this is explained in detail later ).
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SWEN20003 Object Oriented Software Development Project 1, 2024
(a) player left.png (b) player right.png
Figure 2: The player’s images
The player is represented by the two images shown above. Based on the direction the player is
moving, the corresponding image should be rendered. The player will start the game facing right.
The player’s jumping upwards motion will be considered in 3 stages, where the speed in the vertical
direction will change:
• Player is currently on platform & up arrow key is pressed => the vertical speed should be
set to -20 (i.e. the y-coordinate will be decreasing by 20 pixels per frame).
• During the player’s jumping motion => vertical speed should increase by 1 each frame.
• Player has finished jump & has reached platform again => vertical speed should be set to 0
and the player should not move below the platform.
Hint: Remember that y increases in the downward direction on screen.
Figure 3: Player’s score
The player has an associated score. When the player collides with a
coin, the player’s score increases by 1 (the points value of the coin). The
score is rendered in the top left corner of the screen in the format of
"SCORE k" where k is the current score. The bottom left corner of this
message should be located at (35, 35) and the font size should be 30.
Figure 4: Player’s health
When a player collides with an enemy, the player’s health decreases by
0.5 (the damage points value of the enemy). The player starts the game
with a health value of 1. The health value is rendered in the top right
corner of the screen in the format of "HEALTH k" where k is the current
health, shown as integer percentage of the total health. The bottom left
corner of this message should be located at (750, 35) and the font size should be 30.
If the player’s health value becomes less than or equal to zero, the player moves vertically down
off the screen and the game ends. This is done by setting the vertical speed to 2 pixels per frame.
Enemy
Figure 5: enemy.png
An enemy is an entity shown by enemy.png, that can move in the horizontal direction. It has a damage points value of 0.5. When the player’s
arrow keys are pressed, the enemy will move accordingly as described below.
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SWEN20003 Object Oriented Software Development Project 1, 2024
When the player’s right arrow key is pressed or held down, the enemy will move to the left by 5
pixels per frame. When the player’s left arrow key is pressed or held down, the enemy will move
to the right by the same speed. When the enemy collides with a player, it inflicts damage to the
player’s health as described earlier. Once an enemy has inflicted damage once, it cannot inflict
damage again even if there are further collisions.
Collision Detection
To detect collisions, a range is first calculated by adding the radius of the enemy image and the
radius of the player image. Both values are given in the app.properties file. The current distance between the player and the enemy is determined by calculating the Euclidean distance
between the two (x, y) coordinates. If the current distance is less than or equal to the range,
this is considered as a collision.
Coin
Figure 6: coin.png
A coin is an entity shown by coin.png, that can move in both horizontal
and vertical directions. It has a points value of 1. When the player’s arrow
keys are pressed, the coin will move as described below.
When the player’s right arrow key is pressed or held down, the coin will
move to the left by 5 pixels per frame. When the player’s left arrow key is pressed or held down,
the coin will move to the right by the same speed.
When a coin collides with a player, the player’s score increases by 1. The collision detection is determined in the same way as described above in the Enemy section. Once a collision has happened,
a coin will move upwards and disappear off screen. This is done by setting the vertical speed to
-10 pixels per frame.
Platform
Figure 7: platform.png (cropped to show on one page)
The platform is an entity shown by platform.png, that can move in the horizontal direction.
When the player’s arrow keys are pressed, the platform will move as described below.
When the player’s right arrow key is pressed or held down, the platform will move to the left by
5 pixels per frame. When the player’s left arrow key is pressed or held down, the platform will
move to the right by the same speed, only if the platform’s current x-coordinate is less than 3000.
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SWEN20003 Object Oriented Software Development Project 1, 2024
End Flag
Figure 8: endflag.png
The end flag is an entity shown by endflag.png, that can move in the
horizontal direction. When the player’s arrow keys are pressed, the flag
will move as described below.
When the player’s right arrow key is pressed or held down, the flag will
move to the left by 5 pixels per frame. When the player’s left arrow
key is pressed or held down, the flag will move to the right by the same speed.
When the flag collides with a player, the game ends as a win for the player. The collision detection
is checked in the same way as described in the Enemy section.
Your Code
You must submit a class called ShadowMario that contains a main method that runs the game as
prescribed above. You may choose to create as many additional classes as you see fit, keeping in
mind the principles of object oriented design discussed so far in the subject. You will be assessed
based on your code running correctly, as well as the effective use of Java concepts. As always in
software engineering, appropriate comments and variables/method/class names are important.
Implementation Checklist
To get you started, here is a checklist of the game features, with a suggested order for implementing
them:
• Draw the title and game instruction messages on screen
• Read the world file, and draw the platform on screen
• Draw the player, one coin, one enemy and the platform on screen
• Implement movement logic for the 4 entities above
• Implement image rendering and movement for all the entities in the world file
• Implement the scoring behaviour when the player collides with a coin
• Implement the health logic for the player
• Implement win detection and draw winning message on screen
• Implement lose detection and draw losing message on screen
Supplied Package
You will be given a package called project-1-skeleton.zip that contains the following: (1)
Skeleton code for the ShadowMario and IOUtils classes to help you get started, stored in the src
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SWEN20003 Object Oriented Software Development Project 1, 2024
folder. (2) All graphics, fonts and properties that you need to build the game, stored in the res
folder. (3). The pom.xml file required for Maven. Here is a more detailed description:
• res/ – The graphics and font for the game (you are not allowed to modify any of the files in
this folder).
– background.png: The image to represent the background.
– coin.png: The image to represent a coin.
– endflag.png: The image to represent the end flag.
– enemy.png: The image to represent an enemy.
– platform.png: The image to represent the platform.
– player left.png: The image to represent the player facing left.
– player right.png: The image to represent the player facing right.
– app.properties: The properties file containing coordinates, values and file paths.
– message en.properties: The properties file containing the message strings.
– FSO8BITR.ttf: The font to be used throughout this game.
– level1.csv: The world file for the first level.
– credit.txt: The file containing credit for the font and images (you can ignore this file).
• src/ – The skeleton code for the game.
– ShadowMario.java: The skeleton code that contains an entry point to the game and an
update() method that draws the background.
– IOUtils.java: The skeleton code that has an empty method to read a CSV file and a
completed method to read a Properties file.
• pom.xml: File required to set up Maven dependencies.
Submission and Marking
Initial Submission
To ensure you start the project with a correct set-up of your local and remote repository, you
must complete this Initial Submission procedure on or before Thursday, 28th March 2024 at
11:30pm.
1. Clone the [user-name]-project-1 folder from GitLab.
2. Download the project-1-skeleton.zip package from Canvas, under Project 1.
3. Unzip it.
4. Move the contents of the unzipped folder to the [user-name]-project-1 folder in your
local machine.
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SWEN20003 Object Oriented Software Development Project 1, 2024
5. Add, commit and push this change to your remote repository with the commit message
"initial submission".
6. Check that your push to Gitlab was successful and to the correct place.
After completing this, you can start implementing the project by adding code to meet the requirements of this specification. Please remember to add, commit and push your code regularly with
meaningful commit messages as you progress.
You must complete the Initial Submission following the above instructions by the due date. Not
doing this will incur a penalty of 3 marks for the project. It is best to do the Initial Submission before starting your project, so you can make regular commits and push to Gitlab since the
very start. However, if you start working on your project locally before completing Initial Submission, that is fine too, just make sure you move all of the contents from your project folder to
[user-name]-project-1 in your local machine.
Technical requirements
• The program must be written in the Java programming language.
• Comments and class names must be in English only.
• The program must not depend upon any libraries other than the Java standard library and
the Bagel library (as well as Bagel’s dependencies).
• The program must compile fully without errors.
Submission will take place through GitLab. You are to submit to your <username>-project-1
repository. At the bare minimum you are expected to follow the structure below. You can create
more files/directories in your repository if you want.
username -project-1
res
resources used for project 1
src
ShadowMario.java
other Java files
On 17th April 2024 at 11:30pm, your latest commit will automatically be harvested from GitLab.
Commits
You are free to push to your repository post-deadline, but only the latest commit on or before
17th April 2024 11:30pm will be marked. You must make at least 5 commits (excluding the Initial
Submission commit) throughout the development of the project, and they must have meaningful
messages (commit messages must match the code in the commit). If commits are anomalous (e.g.
commit message does not match the code, commits with a large amount of code within two commits
which are not far apart in time) you risk penalization.
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SWEN20003 Object Oriented Software Development Project 1, 2024
Examples of good, meaningful commit messages:
• implemented movement logic
• fix the player’s scoring behaviour
• refactored code for cleaner design
Examples of bad, unhelpful commit messages:
• fesjakhbdjl
• yeah easy finished the logic
• fixed thingzZZZ
Good Coding Style
Good coding style is a contentious issue; however, we will be marking your code based on the
following criteria:
• You should not go back and comment your code after the fact. You should try to comment
as you go.
• You should be taking care to ensure proper use of visibility modifiers. Unless you have a very
good reason for it, all instance variables should be private (apart from constants).
• Any constant should be defined as a final static variable (Note: for Image and Font objects,
use only final). Constants can be public depending on usage. Don’t use magic numbers!
• Think about whether your code is written to be easily extensible via appropriate use of classes.
• Make sure each class makes sense as a cohesive whole. A class should have a single well-defined
purpose, and should contain all the data it needs to fulfil this purpose.
Extensions and late submissions
If you need an extension for the project, please complete the Extension form in the Projects
module on Canvas. Make sure you explain your situation with some supporting documentation
such as a medical certificate, academic adjustment plan, wedding invitation, etc. You will receive
an email saying if the extension was approved or if we need more information.
The project is due at 11:30pm sharp. Any submissions received past this time (from 11:30pm
onwards) will be considered late unless an extension has been granted. There will be no exceptions.
There is a penalty of 1 mark for a late project, plus an additional 1 mark per 24 hours. If you
submit late (either with or without an extension), please complete the Late form in the Projects
module on Canvas. For both forms, you need to be logged in using your university account.
Please do not email any of the teaching team regarding extensions or late submissions.
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SWEN20003 Object Oriented Software Development Project 1, 2024
Marks
Project 1 is worth 10 marks out of the total 100 for the subject. Although you may see how
inheritance can be used for future extensibility, you are not required to use inheritance in this
project.
• NOTE: Not completing the Initial Submission (described in the Submission and Marking
section here) before beginning your project will result in a 3 mark penalty!
• Features implemented correctly – 6.5 marks
– Starting screen is implemented correctly: (0.5 marks)
– The player images and movement are implemented correctly: (1 mark)
– The platform image and movement is implemented correctly: (1 mark)
– The enemy image and movement (including player collision logic) is implemented correctly: (1 mark)
– The coin image and movement (including player collision logic) is implemented correctly:
(1 mark)
– The end flag image and movement is implemented correctly: (1 mark)
– Win detection is implemented correctly with winning message rendered: (0.5 marks)
– Loss detection is implemented correctly with game-over message: (0.5 marks)
• Code (coding style, documentation, good object-oriented principles) – 3.5 marks
– Delegation and Cohesion – breaking the code down into appropriate classes, each being
a complete unit that contain all their data: (1 mark)
– Use of Methods – avoiding repeated code and overly long/complex methods: (1 mark)
– Code Style – visibility modifiers, consistent indentation, lack of magic numbers, commenting, etc. : (1.5 marks)请加QQ:99515681  邮箱:99515681@qq.com   WX:codinghelp

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