CPSC 120B Assignment #2

Due, Friday October 15, 2004 by 4:00 p.m.

Write a Java applet that draws a scene containing two critters of some sort (robots, clowns, monsters, "Big Bird"- like things -- use your imagination -- anything but snowmen) and a flock of birds. Both critters will be of the same type (whatever type you choose) and you will create a class to define the critter. Similarly you will have a class for a bird.

Requirements for the critter class:

The instance data should specify the position of the critter (this will require two variables - one for how far over and one for how far down), the height of the critter, and the color. You may wish to have more than one color parameter. The critter should be drawn with more than one color and you can either let the calling program choose the other colors (by having more color parameters) or you can choose them in the class (either use a specific color or a random color).
The class must have a constructor that has parameters that specify the position, height, and color.
The class must have a draw method that draws the critter.
A critter must have a head, arms, legs, and a main trunk. The head should have eyes with pupils, a nose and a mouth. The width of the trunk and other body parts should be determined in proportion to the height (for example, you may want the head to be one-third the height or 28% of the height -- some function of the height). The coordinates of the pieces will also need to be related to the height.

Requirements for the bird class:

The instance data should specify the position and size of the bird. You can also have a color parameter if you wish to allow different colors of birds.
The class must have a constructor that has parameters that specify the position and height (and color if you include color).
The class must have a draw method to draw a bird.
The bird can be very simple. Just be sure what you come up with sort of looks like a bird.

Your applet that draws a scene containing birds and critters should draw a sky and ground (or ocean if your critters swim). It should instantiate and draw at least 6 different bird objects for the flock of birds (of course these should be drawn in the sky) and at least 2 different critter objects (which should be on the ground). The heights of the critter objects should be random (in some appropriate range). NOTE: Do the random number generation for the height in your applet and send the height as a parameter (instead of generating a random height in the critter class).

Additional requirements:

Make the critters colorful. Use at least two different colors you create.
Use good programming style -- meaningful variable names, named constants, use of white space, proper indentation (note the proper style for indenting if statements). See the requirements for the last assignment.
Document your program. Have header documentation at the top of each file that gives your name, the date, the file name, and a description of the purpose of the program. Have internal documentation that delineates and succinctly (and clearly) indicates what each method is doing.

Grading

Your program will be graded both on style and correctness. Style includes adherence to rules for naming of identifiers and use of white space; it also includes coding style such as the absence of unnecessary code (extra comparisons in if's or extra assignments); it includes appropriate documentation. Style will be 20% of the grade on the assignment. Correctness includes meeting all the specifications of the assignment. A program that does not compile has an automatic deduction of 70%; one that does not run has an automatic deduction of 40% no matter how "close" it is to compiling or running. Come see me if you have problems with the assignment. It is important that you get in the habit of producing correct programs!

Academic Integrity Reminder!!! Programming assignments are to be your own work. You may get help on the specifics of the assignment from no one except the instructor. You may not show your program to anyone or look at anyone else's program or share ideas with anyone about how to write the program.

Hand IN: A printed copy of your program files (the 3 Java files - you do not need to hand in the HTML file). Tar the .class, .html, and .java files and email the .tgz file to ingram@roanoke.edu with a subject of cpsc120 project2.