CS246—Assignment 4 – Part 2(Fall 2017)

Due Date 1: Monday, November 13, 5pm Due Date 2: Monday, November 20, 5pm
Note that this is Part 2 of Assignment 4. Part 1 of assignment 4 has been released separately. The due dates specified above apply to both Part 1 and Part 2.
Note: You must use the C++ I/O streaming and memory management facilities on this assign- ment. Marmoset will be programmed to reject submissions that use C-style I/O or memory management.
Note: You may include the headers , , , , , , , and .
Note: For this assignment, you are not allowed to use the array (i.e., []) forms of new and delete. Further, the CXXFLAGS variable in your Makefile must include the flag -Werror=vla.
Note: Each question on this assignment asks you to write a C++ program, and the programs you write on this assignment each span multiple files. For this reason, we strongly recommend that you develop your solution for each question in a separate directory. Just remember that, for each question, you should be in that directory when you create your zip file, so that your zip file does not contain any extra directory structure.
Note: Problem 5 asks you to work with XWindows graphics. Well before starting that question, make sure you are able to use graphical applications from your Unix session. If you are using Linux you should be fine (if making an ssh connection to a campus machine, be sure to pass the -Y option). If you are using Windows and putty, you should download and run an X server such as XMing, and be sure that putty is configured to forward X connections. Alert course staff immediately if you are unable to set up your X connection (e.g. if you can’t run xeyes).
Also (if working on your own machine) make sure you have the necessary libraries to compile graphics. Try executing the following:
g++14 window.cc graphicsdemo.cc -o graphicsdemo -lX11
(Note: that is a dash followed by lower case L followed by X and then one one)
Run the program
3. In this problem you will implement an extensible image processing package that can apply flip, rotate and sepia transformations to an image using the Decorator pattern. You are provided with a partially-implemented mainline program for testing your image processor (main.cc). Assuming the program is named a4p3, the program can be executed as follows:
./a4p3 source.ppm destination.ppm flip rotate flip sepia
source.ppm is the name of the file that contains the Image to be transformed. destination.ppm is the name of the file to which the transformed image is written. The format for ppm files is discussed below. After the source and destination files come 0 or more of flip, rotate and sepia in any order and any number of times. The program constructs a custom Image pro- cessor from this list of decorators and applies the transformations to the Image in source.ppm
Internal Representation of Image: The internal representation for an Image used by the program is already provided to you in a class PPM defined in ppm.h. Note that you have also been provided with ppm.o (an object file that contains the implementation of methods and functions declared in ppm.h). In particular, we have already implemented overloaded input and output operators for PPM. The overloaded input operator for PPM will update a PPM object to create the internal representation of the Image available on the input stream. The overloaded output operator for PPM converts the internal representation of an Image back to PPM format. You need not know how these have been implemented.
Format of source and destination files (Plain PPM Format): The source image and the destination image are represented in “Plain PPM format” which is a simple image encoding format. Since the input and output operators of PPM have already been implemented, you do not need to know the details. However, if you are curious, refer to http://netpbm. sourceforge.net/doc/ppm.html for details (Plain PPM section). Some documentation is also present in ppm.h.
We have provided you with two sample .ppm files to help you test your program. small.ppm is a small image with multiple colors. castle.ppm is a very large image of a castle. To see the effects of your transformations, you can open ppm files with certain image viewing software (e.g. gimp).
Transformations through the Decorator Pattern: You are also provided with the following fully-implemented classes:
• Image (image.{h,cc}): abstract base class that defines the interface to the image pro- cessor.
• BasicImage (basic.{h,cc}): concrete implementation of Image, which provides default behaviour. In particular, the already implemented method BasicImage::render uses the input operator for PPM to create the internal representation from the input stream.
You are not permitted to modify these two classes in any way.
You must provide the following transformations that can be added to the default behaviour of BasicImage via decorators:
• flip: Modifies the internal representation (PPM) so that it now represents an image that has been flipped horizontally. In other words, Pixel 1 of a row with n Pixels becomes Pixel n, Pixel 2 becomes Pixel n-1 and so on.
• rotate: Modifies the internal representation (PPM) so that it now represents an image that has been rotated 90◦ clockwise. If i is the column index and j is the row index of a pixel in the rotated image, then the following will give the required values for the new pixels, where ppm contains the current image.
newPixel[i * ppm.height + j] = ppm.pixels[ppm.width * (ppm.height – j – 1) + i];
• sepia: Modifies the internal representation (PPM) so that it now represents an image that has a sepia filter applied to the image. Apply the following formulae (exactly as given) to each pixel in the image. For Pixel p with result stored in Pixel np:
np.r = p.r *.393 + p.g * .769 + p.b * .189
np.g = p.r *.349 + p.g * .686 + p.b * .168
np.b = p.r *.272 + p.g * .534 + p.b * .131
If any of the final values above exceed 255, then set them to the maximum value of 255.
These functionalities can be composed in any combination of ways to create a variety of custom Image processors.
You must change main.cc so that it updates the img pointer variable to an appropriate deco- rated Image transformer based on the transformations given in the command line argumnets.. The area of code you would need to modify is clearly marked.
Your program must be clearly written and must follow the Decorator pattern (with each class in its own .h and .cc file). Since the purpose of this question is to practice writing the Decorator pattern, failure to follow these instructions will lead to all your Due Date 2 correctness marks for this question being revoked. Your program must not leak memory.
Due on Due Date 1: A UML diagram (in PDF format q3UML.pdf) for your proposed implementation of this program. There are links to UML tools on the course website. Do not handwrite your diagram. Your UML diagram will be graded on the basis of being well- formed, and on the degree to which it reflects a correct design. Note that we have not asked you to create any test cases. We highly recommend creating them for your own use.
Due on Due Date 2: Submit your solution. You must include a Makefile, such that issuing the command make will build your program. The executable should be called a4q3.
4. In this problem, you will use C++ classes to implement the game of Reversi. (https://en.wikipedia.org/wiki/Reversi). An instance of Reversi consists of an n × n- grid of cells, each of which can be either empty, black, or white. When the game begins the middle 4 cells are populated following the pattern Black-White-Black-White. Reversi is a two-player game where players take turns placing a piece of their colour in a cell. Black plays first. The goal of Reversi is to have the most cells holding pieces of your colour at the end of the game. If a new piece A would form a line segment with an existing piece B of the same colour, such that all of the cells in between are occupied and of the opposite colour, those in-between pieces are flipped to the same colour as A and B. There is one slight difference from standard Reversi: whereas a legal move in standard Reversi must cause at least one flip, your program is not required to enforce this rule. This means that on any turn players can play a piece on any cell, so long as that cell is within the grid and not currently occupied by another piece.
To implement the game, you will use the following classes:
• class Subject — abstract base class for subjects (see provided subject.h);
• class Observer — abstract base class for observers (see provided observer.h);
• class Cell — implements a single cell in the grid (see provided cell.h);
• class Grid — implements a two-dimensional grid of cells (see provided grid.h);
• struct State — provides a representation of a cells state (see provided state.h
• class TextDisplay — keeps track of the character grid to be displayed on the screen (see provided textdisplay.h);
• file info.h structure definition for queries issued by the observer on the subject.
Note: you are not allowed to change the public interface of these classes (i.e., you may not add public fields or methods), but you may add private fields or methods if you want.
Your solution to this problem must employ the Observer pattern. Each cell of the grid is an observer of all of its neighbours (that means that class Cell is its own observer). Thus, when the grid calls notifyNeighbours on a given cell, that cell must then call the notify method on each of its neighbours (each cell is told who its neighbours are when the grid is initialized). Moreover, the TextDisplay class is an observer of every cell (this is also set up when the grid is initialized). A subject’s collection of observers does not distinguish what kinds of observers are actually in the collection (so a cell could have arbitrary cells or displays subscribed to it). When the time comes to notify observers, you just go through the collection and notify them.
As a hint for implementation, consider how the rules of the game above can be replicated using an observer pattern where a notification can either be a notification of a new piece, a relay of that new piece message, or a reply to that new piece being found. A cell that receives a new piece can notify its observers (adjacent cells) that it has received a new piece of a certain colour. The cells notified of a new piece by their neighbour can relay that message along the line. When a message is received by a cell that contains the same colour piece as the new piece, it can reply back in a similar fashion. Hence, when a piece matching the colour of the new piece is reached, the message stops relaying and instead replies back. Similarly if there are no pieces in a cell to relay a message then it should stop. Since the observer pattern doesn’t distinguish what observers are in the collection the cell receiving a new piece can’t send out specific information about the direction of each line to its appropriate
neighbours. However, when a neighbour receives a notification of a new piece they can check the information passed along and determine what direction they are from the original piece, and relay that information along. For more information on these messages see the state.h file provided to you.
You are to overload operator<< for the text display, such that the entire grid is printed out when this operator is invoked. Each empty cell prints as - and a cell with a white or black piece prints as W or B respectively. Further, you are to overload operator<< for grids, such that printing a grid invokes operator<< for the text display, thus making the grid appear on the screen. When you run your program, it will listen on stdin for commands. Your program must accept the following commands: • new n Creates a new n×n grid,where n ≥ 4∧n ≡ 0 (mod 2). If there was already an active grid, that grid is destroyed and replaced with the new one. When setting up the new grid your program should intialize the middle 4 squares following the Black-White- Black-White pattern. • play r c Within a game, plays a piece at row r, column c of the colour corresponding to the player who’s move it is. If the row and column entered correspond to a cell that already has a piece, or a position outside the grid, then the input is ignored and nothing is done. The program ends when the input stream is exhausted, or when the game is over. The game is over when there are no more empty cells on the grid., When the game is over, if the black player wins the program should display Black Wins! to stdout before terminating; if the white player wins it should display White Wins!; otherwise it should display Tie!. If input was exhausted before the game was won or lost, it should display nothing. A sample interaction follows (responses from the program are in italics): new 8 -------- -------- -------- ---BW--- ---WB--- -------- -------- -------- play 3 5 -------- -------- -------- ---BBB-- ---WB--- -------- -------- -------- play 3 6 -------- -------- -------- ---BBBW- ---WB--- -------- -------- -------- play 3 2 -------- -------- -------- --BBBBW- ---WB--- -------- -------- -------- play 2 3 -------- -------- ---W---- --BWBBW- ---WB--- -------- -------- -------- play 0 0 B------- -------- ---W---- --BWBBW- ---WB--- -------- -------- -------- play 3 1 B------- -------- ---W---- -WWWBBW- ---WB--- -------- -------- -------- play 7 7 B------- -------- ---W---- -WWWBBW- ---WB--- -------- -------- -------B ^d Note: Your program should be well documented and employ proper programming style. It should not leak memory. Markers will be checking for these things. Due on Due Date 2: Submit your solution. You must include a Makefile, such that issuing the command make will build your program. The executable should be called a4q4. 5. Note: there is no sample executable for this problem, and no Marmoset tests. This problem will be entirely hand-marked. In this problem, you will adapt your solution from problem 4 to produce a graphical display. You are provided with a class Xwindow (files window.h and window.cc), to handle the mechanics of getting graphics to display. Declaring an Xwindow object (e.g., Xwindow xw;) causes a window to appear. When the object goes out of scope, the window will disappear (thanks to the destructor). The class supports methods for drawing rectangles and printing text in five different colours. For this assignment, you should only need black, white, and blue rectangles. In the graphical representation let blue represent an empty cell, black represent a cell containing a piece from the black player, and white represent a cell containing a piece from the white player. To do so you must complete the following tasks: • Create a GraphicsDisplay class as a subclass of the abstract base class Observer, and register it as an observer of each cell object. • The class GraphicsDisplay will be responsible for mapping the row and column numbers of a given cell object to the corresponding coordinates of the squares in the window. • Your GraphicsDisplay class should have a composition relationship with Xwindow. So your constructor for GraphicsDisplay should also create a Xwindow object which is a member of the GraphicsDisplay class. Each time a new game is created you should create a new GraphicsDisplay to set up an appropriate window for the game size. • Your cell objects should not have to change at all. The window you create should be of size 500×500, which is the default for the Xwindow class. The larger the grid you create, the smaller the individual squares will be. Note: to compile this program, you need to pass the option -lX11 to the compiler at link time. For example: g++-5 -std=c++14 *.o -o a4q5 -lX11 This option is not relevant during compilation, so it should not be put in your CXXFLAGS variable. You should only use it during the linking stage, i.e., the command that builds your final executable. Note: Your program should be well documented and employ proper programming style. It should not leak memory (note, however, that the given XWindow class leaks a small amount of memory; this is a known issue). Markers will be checking for these things. Due on Due Date 2: Submit your solution. You must include a Makefile, such that issuing the command make will build your program. The executable should be called a4q5.


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