====== Assignment 1 - Spring 2021 ======

~~NOTOC~~

===== Virtual Cat World =====

**Assigned:** Mon, Mar 8 \\
**Due:** Mon, Mar 15

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==== Assignment Setup ====

  - Open a browser and copy/paste this URL: https://classroom.github.com/a/rB8Krlqz \\ \\ 
  - Login to Github and you will be prompted to accept this assignment
    - After you click on the [Accept this assignment] button, you will see a new page display in your browser with the message: 
      - You accepted the assignment, Assignment 1. We're configuring your repository now. This may take a few minutes to complete. Refresh this page to see updates. 
    - After you refresh the page you should see a page with the message: "You're ready to go!"
    - Note: this will create your own copy of Assignment 1 for you to work on, but it's not on your computer yet. \\ \\ 
  - Click on the URL where your assignment repository has been created: https://github.com/Vassar-cs101-mlsmith/assignment-1-yourGitHubID
    - you are now on the GitHub page for your Assignment 1 repository \\ \\
  - Click on the green button to download your [Code]
    - a "Clone" dialog box will appear, with the HTTPS tab underlined in red (if not, click on the HTTPS tab to select it)
    - select the last option labeled "Download ZIP" and save it on your computer
    - move the Assignment 1 zip file from its download location to your ''cs101'' course folder.
    - extract the contents of the zip file either by double-clicking on it or control-clicking on it and selecting the appropriate option to extract its contents
    - navigate into your ''assign1'' folder and confirm you see the ''cat-prog.rkt'' and ''gauge-prog.rkt'' files there.

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==== Description ====

** Program 1: cat-prog.rkt ** 

  * Open ''cat-prog.rkt'' in DrRacket  
  * Put your name in the header comments
  * Complete Exercises 45 and 46 (on pp. 100--101 of HtDP/2e [[https://htdp.org/2018-01-06/Book/part_one.html#%28part._sec~3azoo1%29|Section 3.7]]) 
    * be sure to refer to our class notes for a fully worked example of a {{ :courses:cs101-2021-5657:big-bang-example.rkt |big-bang program}}
    * for values that never change, define constants and use them by name. 
    * constants I defined were: 
      * WIDTH (800) and HEIGHT (200)
      * CAT-y (half the HEIGHT) and 
      * MT (the empty-scene with dimensions WIDTH and HEIGHT)
      * in addition to my cat1 and cat2 image constants \\ \\

** Program 2: gauge-prog.rkt ** 

For this program we're going to create a "happiness gauge" for our cat. Later, we'll combine this program with the first program, but for right now we'll keep them separate. 

  * Open ''gauge-prog.rkt'' in DrRacket  
  * Put your name in the header comments
  * Complete Exercise 47 (on pp. 100--101 of HtDP/2e [[https://htdp.org/2018-01-06/Book/part_one.html#%28part._sec~3azoo1%29|Section 3.7]]) 
    * Some notes:
      * you will need to use two of the overlay functions from the 2htdp/image teachpack, and you can look up examples of how to use them on your own -- but ask me or the coaches for help if needed.
      * in particular, you will find the ''overlay'' and ''overlay/align'' functions helpful.
      * for values that never change, define constants and use them by name. 
      * constants I defined were: 
        * WIDTH and HEIGHT (same as in first program)
        * MT (the empty-scene)
        * MT-mid-x

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===== Submitting your work =====

  * From your browser on the GitHub page for your Assignment 1 repository, click on the [Add file] drop-down button and select "Upload files"
  * From your assign1 folder on your desktop, click and drag the ''cat-prog.rkt'' and ''gauge-prog.rkt'' files onto your browser where it says, "Drag files here to add them to your repository"
    * just below the region of the webpage you should see both files appear; they'll be just above the Commit Changes section of the page.
  * You are now ready to commit changes! Click on the green [Commit changes] button.
  * Your updated ''cat-prog.rkt'' and ''gauge-prog.rkt'' files file should now be in your Assignment 1 GitHub repository.