Assignment 1

Dates

Assigned: September 25, 2019

Due: October 2, 2019

Description

Program 1: cat-prog.rkt

• Open Dr. Racket and save the empty definitions as your-name-cat-prog.rkt
• Put your name in the header comments
• Complete Exercises 45 and 46 (on pp. 100–101 of HtDP/2e Section 3.7)
  • be sure to refer to our class notes for a fully worked example of a 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
    • EMPTY-SCENE (the empty-scene with dimensions WIDTH and HEIGHT)
    • in addition to CAT1 and CAT2 image constants

Program 2: gauge-prog.rkt

Create a “happiness gauge” for your cat. Later, we'll combine this program with the first program, but for right now keep them separate.

1. Open Dr. Racket and save the empty definitions as your-name-gauge-prog.rkt
2. Put your name in the header comments
3. Complete Exercise 47 (on pp. 100–101 of HtDP/2e Section 3.7)
   • Some notes:
     • you will need to use two of the overlay functions from the 2htdp/image teachpack.
     • 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
       • EMPTY-SCENE (the empty-scene)
       • EMPTY-SCENE-MID-X

Submission and Grading

Submit both programs with an .rkt extension via Moodle. They will be graded based on the posted assignment grading rubric.