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资源说明：A simple 2-player chess game with no AI.
---------------------------Getting Started---------------------------------- This repository represents a game of chess played by two players. It is based on the GridWorld case study [http://www.collegeboard.com/student/testing/ap/compsci_a/case.html] which is part of the AP Computer Science A curriculum, found at http://www.collegeboard.com/student/testing/ap/sub_compscia.html?compscia. The documentation for the project may be found in the Documentation directory. The beginning coder is advised to look there for instructions both on the rules that the game operates under, as well as instructions on operating GitHub. It is reprinted below, in order to provide a general library. This file provides the basics for getting started with GitHub, using the Galileo distribution of Eclipse on a Windows XP or higher system. GitHub is a social coding repository, which means that it serves as a storage place for your code. The proper model for GitHub is thus one of a bank: your code is stored on a remote repository, and you work on a local repository. There is only one remote repository, but there are as many local ones as there are people working on the code. Each local repository may be altered by the person editing it. These alterations will eventually be merged in the remote repository. It is the remote repository which will eventually hold the completed project. Thus, you can think of your local repository as a sandbox. You can do whatever you want to it, without corrupting your group’s project. There is some basic terminology that you will need to be able to work with GitHub. First, GitHub is a remote repository. This means that it holds your code, as was mentioned before. When you get the project from GitHub, you are performing an operation called a checkout, and this is performed the first time you get the project. When you are working on your project locally, there are two levels of saving. There is the normal saving that you perform on your file system, and this will be performed to save your files to persistent storage between sessions [this is what you are used to, and is what you do when you save files before closing your IDE]. However, when you reach a point where you have brought your code to a savable point [that is, a point that you would like to preserve, so that you can return your code to it if you make a mistake], then you are ready to perform a commit. A commit creates a checkpoint on your local repository – it overrides the local repository with your current project, and allows you to revert to that state at a later date if you so need. However, it does not move your code out to the remote repository on GitHub. When you reach a point where your code is ready for export [that is, you’re ready to try to synch it with your team’s code], then you’re ready to actually push it from your local repository to the remote repository. All of these operations will be covered in further entries. You should read the files in this directory in this order, before you start working with GitHub: 1) Getting Started 2) Creating a GitHub account 3) Installing EGit 4) Importing the Remote Repository 5) Adding new folders and files 6) Committing changes 7) Pushing to the remote repository 8) Checking for updates on the remote repository ---------------------------Creating a GitHub account---------------------------------- GitHub is a remote repository that works through a protocol called SSH. SSH stands for Secure Shell, and is an encrypted protocol for safe transmission of data. Its primary purpose is to wrap, or ‘tunnel’ other applications, and that is what occurs in this case. INSTALLING SSH To create a GitHub account, there are several steps. The first step involves installing SSH on your local system. To install SSH, follow these steps: 1) Open a command prompt shell, using either WinKey + R and 'cmd,' or Start->Run…, type 'cmd' and hit enter, or Start->All Programs->Accessories->Command Prompt, type 'cmd,' and click Run. 2) Type ssh and hit enter. If you see the following: 'ssh' is not recognized as an internal or external command, operable program or batch file. Then SSH is not installed on your system, and you will need to install it. Otherwise, skip the following instructions, and go to the section labeled CREATING THE ACCOUNT. 3) You will need to install SSH. GitHub is compatible with OpenSSH, a distribution of SSH that works through Cygwin, a Linux-like shell for Windows that layers on top of the Command Prompt. Download the Cygwin installer from http://www.cygwin.com/setup.exe. Run the file, and select the option to 'Install from the Internet.' Specify your settings [select All Users only if you're an administrator], and choose a mirror [a mirror is simply a remote repository -- your selection doesn't matter, but I recommend an FTP]. If something fails during installation, try a different mirror. You can find these instructions with sample images at http://pigtail.net/LRP/printsrv/cygwin-sshd.html. [However, the image is out of date: some of the pieces present no longer exist, and the version of OpenSSH is old. Ignore these, and just get it to look similar] Follow these instructions for the selection of OpenSSH: As documented by this image [http://pigtail.net/LRP/printsrv/openssh-setup.png], When a selection screen comes up (you can resize the windows to see better), click the little View button for "Full" view, find the package "openssh", click on the word "skip" so that an X appears in Column B. This will ensure that OpenSSH is installed on your system. Now, finish the installation without changing any of the other default settings. This may take some time, as some of the parts are quite large. CREATING THE ACCOUNT 1) Go to https://github.com/signup/free and fill out the information there. You do not need to worry about the SSH public key, leave that blank. You will take care of it at a later step. 2) Select the 'Account Settings' tab, or go to https://github.com/account. Select the button labeled 'SSH Public Keys.' 3) This, and the next few steps, are devoted to creating your keys for use with GitHub. Open a command prompt instance, as you did before when validating your SSH installation. Run the command [with your email instead of 'username@domain.com']: ssh-keygen -t rsa -C "username@domain.com" Sample output looks like this [when you reach the file entry, you do not need to enter any file location. Use the default location [just hit enter]. You do not need a passphrase for this, as security is not that much of an issue]: ssh-keygen -t rsa -C "tekkub@gmail.com" Generating public/private rsa key pair. Enter file in which to save the key (/c/Users/Tekkub/.ssh/id_rsa): Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /c/Users/Tekkub/.ssh/id_rsa. Your public key has been saved in /c/Users/Tekkub/.ssh/id_rsa.pub. The key fingerprint is: e8:ae:60:8f:38:c2:98:1d:6d:84:60:8c:9e:dd:47:81 tekkub@gmail.com IF YOU RUN INTO PROBLEMS BECAUSE YOUR KEY CANNOT BE SAVED BECAUSE THE DIRECTORY DOES NOT EXIST [you are probably not an Administrator], THEN FOLLOW THESE STEPS: A) Run the command: cd C:\cygwin\home B) Run the command: mkdir "USERNAME" *Replace USERNAME with the name of your account. This will show up in the attempted creation from above. In the example case, it was Tekkub from Users.* C) Run the command: cd "USERNAME" *Replace USERNAME with the name of your acount* D) Run the command: mkdir .ssh E) Try the above step (3) again. It should work correctly now. 4) Find your id_rsa.pub file [the path is given in the output from the generation step]. Open the file, and copy the contents [do not add any newlines, or delete anything. I recommend using Notepad]. 5) Click on the 'Add another public key' option in your GitHub account page from step (2). 6) Paste the contents of the key into the 'Key' field, and leave the Title field blank. 7) Click 'Add key' 8) To validate that you've done it correctly, we'll use the command prompt. Open the command prompt. Now run the following command: ssh git@github.com This will test the connection. If it's configured correctly, you'll see this: ERROR: Hi USERNAME! You've successfully authenticated, but GitHub does not provide shell access Connection to github.com closed. If you see that the original message that SSH is not installed, DON'T PANIC! This indicates that you are not an administrator, and didn't modify your path when installing Cygwin. To test it, do the following: A) Run command: cd C:\cygwin\bin B) Run ssh git@github.com again You can find these instructions at http://help.github.com.iproxy.saverpigeeks.com//msysgit-key-setup/ as well. You have now created your GitHub account. ---------------------------Installing EGit---------------------------------- EGit is the Eclipse plugin layered on top of JGit, a Java implementation of a Git client. Git is the protocol used by GitHub, and is essential for the source control system. EGit is an Eclipse plugin, and can be installed straight to Eclipse. To install EGit, follow these steps: 1) Launch Eclipse 2) Click Help -> Install New Software… 3) Enter 'http://download.eclipse.org/releases/helios' into the 'Work with' field, and hit enter 4) Check Collaboration -> Eclipse EGit Feature (Incubation) and Collaboration -> Eclipse JGit Feature (Incubation) 5) Click Next, and agree to licenses as required 6) Finish the installation, and restart when prompted You have now installed the EGit plugin for Eclipse. Documentation can be found at http://wiki.eclipse.org/EGit/User_Guide. ---------------------------Importing the Remote Repository---------------------------------- To import a remote repository, you must first navigate to the repository. This project's URL is http://github.com/elias390234/Chess. In the middle of the page is a text field with text that says 'This URL has READ + WRITE access.' Make sure that SSH is selected, and copy the contents of that field. [For this project, it is git@github.com:elias390234/Chess.git] Now open Eclipse. Right click in the Package Explorer, and select the Import... option. Expand the Git node, and select 'Git repository.' Paste your URL into the URI field. The dialog box will complain, because EGit can no longer parse Git syntax URIs. To fix it, change the 'protocol' pull down menu to git+ssh. It should match this guide: http://github.com/guides/using-the-egit-eclipse-plugin-with-github. Make sure the username is 'git' and the password is blank. Hit next, and select the master branch of the project. [If Eclipse prompts you to create folders, create all of them. Eclipse is recreating the SSH credentials on your local system. Once you've created the files, open Windows Explorer, and navigate to "C:\Documents and Settings\USERNAME\ssh" Open another instance of Windows Explorer, and navigate to "C:\cygwin\home\USERNAME\.ssh" Copy the files from the latter into the former. Once you've done that, restart Eclipse, and repeat the previous steps] Provide the local location for the project, and finish. Import the project when it's done loading. You've now checked out the project. ---------------------------Adding new folders and files---------------------------------- To add a new folder to the project, use the same operations you would normally - this is a normal Eclipse project. However, you will want to add these to the project itself on your repository. To do this, right click on the added file [you cannot do this to folders, but once you do it to a file in a folder, the folder will be added], find the Team sub menu from the right click menu, and select 'Add to version control.' Having done this, the file will be added the next time you perform a commit. ---------------------------Committing Changes---------------------------------- You have now made some changes, and added some files, and you're ready to commit to your local repository. To perform a commit, right click on the file you wish to commit [or a folder - if you commit a folder, all files inside will be commited. Thus, committing the root directory will commit the whole project], find the Team sub menu, and select the Committ... option. Write a brief commit message explaining what you've changed or added since the last commit, and finish it. ---------------------------Pushing to the remote repository---------------------------------- You have made your changes, and have committed to your local repository. You're now ready to push your local copy to the remote repository, and let your team work with the new code. After a commit, simply right click on the project root, select the Team sub menu, and choose the Push to... option. Use the default configured remote repository. On the second screen. click 'add all branches spec' to perform a complete update. Then, simply finish the update, and your changes will be sent to the remote repository. ---------------------------Checking for updates on the remote repository---------------------------------- Whenever you start to code after a break, there's the possibility that someone else has updated the remote repository, and your code is out of date. To make sure this doesn't happen, you should get in the habit of checking for updates whenever you start coding. It's fairly simple: right click your project directory, select the Team sub menu, and select the Fetch from... option. Use the default configured remote repository, and the default fetch specs. Hit next and finish, and the update will be performed.
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