CS1112 Fall 2008 Project 2 due Monday 9/22 at 6pm
You must work either on your own or with one partner. You may discuss background issues and general solution
strategies with others, but the project you submit must be the work of just you (and your partner). If you work with
a partner, you and your partner must first register as a group in CMS and then submit your work as a group.
Objectives
Completing this project will help you learn about loops and invoking functions. Remember to practice
decomposing a problem into smaller (simpler) sub-problems.
Note: Do not use arrays. You will call several provided functions, but do not create your own functions in
this project. In order to call the provided functions, put them in the same directory/folder as the script that
calls these functions.
1 What time is it?
Have you ever wondered how an analog clock is displayed on a computer screen or other digital devices?
In this problem you will make only a still display, not a running clock! You will write a Matlab script to
display a time (e.g., 23:15:31) on a clock with hour and minute hands.
The clock is drawn in a figure window. Our clock’s hands have a continuous pivot, i.e., they are not restricted
to the 60 individual minute marks. The hour value may be any whole number in [0..23] and the minute
and second values are whole numbers in [0..59]. There are quite a few things that the solution will need, so
practice problem decomposition. Here are some “subproblems” that you need to solve in order to complete
the solution; work on them one at a time: convert numeric time values to angles, convert angles to x-y
coordinates for plotting, draw the clock with tick marks, and draw the hands to indicate the time correctly.
First, structure your solution by writing a comment for each task in the provided skeleton script drawClock
in a logical order. Then fill in the detail (add code) under each comment. Test each newly added section
of code simply by running the (partially completed) program. (Later in the course we will discuss a better
strategy for testing and program development.) Keep in mind that some tasks may appear in multiple parts
of the script (e.g., converting an angle to x-y coordinates for plotting). Below are additional specifications:
•You must call the provided functions DrawDisk,DrawStar,orDrawRect to draw the clock, including
the hour and minute marks.
•Use the plot function to draw the hands. For example, plot([x1 x2],[y1 y2],’r-’,’linewidth’,8)
draws a red line of “width 8” from (x1,y1) to (x2,y2). The hour hand in the figure above has a width
of 8.
•The hour marks must be different from the minute marks.
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