CS 111
Computer Science I

Fall 2025

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Description

The goal of this assignment is to create a phone app that draws your favorite pet animal. The assignment will exercise the following concepts:

• writing procedures/recipes to accomplish some interesting effect
• using variables (i.e. PostIts) for computing and storing intermediate quantities
• learning about the canvas and the various shapes it can draw

Preliminaries

Start DrJava via the Terminal by typing drjava. Then create a new project named MyPetApp in folder cs111/hw . See the Readings List notes on how to create a new project.

General Requirements

Inside MyPetApp write the following procedures:

• drawPet( x, y, size )

  This procedure draws your favorite pet animal centered at the given (x, y) of the given size .

  Do not use the names x, y, size. Once you decide on what animal you plan to draw rename them so that they are more descriptive and reflect what they represent about your pet.

  For example size could be the width or the height of the pet, depending on which is more convenient. If you are drawing a giraffe, size could specify the height of the giraffe; if you are drawing an elephant, size could specify the width of the elephant.

  The anatomical features of the animal should be relative to the given center and the given size of the animal, so that larger (smaller) sizes will produce larger (smaller) animals.

  It is up to you to decide whether (x, y) represent the center of the torso, the center of the face of the animal, etc. Just name them appropriately.

  Occasionally include notes/comments in the code to make it clear what part is being drawn.

• drawScene()

  This procedure draws a simple outdoor scene that covers the whole screen (see notes on canvas on the Readings List for screen dimensions).

  Do not use any variables/PostIts in this procedure. Use fixed/actual numbers to places the objects on the screen.

  Inside this procedure write 2-3 text phrases on the scene. Use different font sizes, styles (e.g. bold or italic), and colors for each phrase (click here for notes on text colors; look for section "Text Colors").

Specific Requirements

Inside public void run() draw the scene (only once) and then draw 3-4 animals of different sizes at various locations.

Each procedure mentioned above should include the following:

• at least one shape of each type (click here for available shapes):
  • ignore Point and Image
  • Polygon is optional for advanced or bored students
  • Text is used only in drawScene

• at least one shape should have an outline of different color (click here for notes on outlines; look for section "Shape Colors")

• at least one shape should have an outline in dashes or dots (click here for notes on dashes/dots; look for section "Shape Colors")

• use at least 4-5 different colors (click here for available colors -- do not put spaces in the names)

What to turn in

Turn in the Java code for the app in the Assignment 1 dropbox:

• open Finder/FileExplorer and go to folder   cs111   (where you run DrJava)

• go to   hw/MyPetApp/src/cs1/MyPetApp   (this is where your code is saved)

• upload the file   MyPetApp.java   (ignore the other files)

Make sure your code is saved. If when you close DrJava it warns you that the file is not saved, save it and re-upload the code.