Description
In Python, a function may be called inside another function. This is how complex
tasks are solved and programmed. A complex task is subdivided into simpler tasks,
then, the simpler tasks are converted into functions (they are easy to program). The
complex task, a function, is now programmed as a series of function calls to the
simpler tasks. In this lab, you will create several functions that help draw the scene
below. I suggest you work in pairs to solve this problem.
The TA will provide a Python program to help get you started (studenthouse.py).
You will begin adding lines of code to complete the functions in the order listed
below (these are the simple tasks). These functions are then called from the
drawhouse() function (the complex task) to produce the image above.
• drawoutline()
• drawwindow()
• drawdoorknob() – used to draw all circular objects
• drawwalk()
After completing drawoutline(), a call to this function produces the image:
After completing drawwindow(), if you call this function four times inside the
drawhouse() function, the first call draws the right-window (be careful, you must
provide the x, y coordinates and the side length), the second call the left-window,
the third call draws the door, and the last call draws the chimney. These four calls
made after the outline of the house produces this image:
After completing the drawdoorknob() function, by placing six calls to
drawdoorknob() inside drawhouse() allows you to draw a doorknob, a moon, and
four craters on the moon to get the final image (after all this function simply
displays a circle of radius r centered at the point (x,y)). Finally, complete the
function drawwalk() that displays the walkway leading from the house to the street.
I’m providing a photo of my “design work” before programming this lab. I hope it
helps you decide on the x, y coordinates, distances and radii needed as arguments to
the function calls.
Getting Help
Inside the Python shell, type
>>> import turtle
then type
>>> help(turtle)
A complete listing of the turtle module is displayed. By scrolling up and down you
can see the functions provided in the turtle module available to you and how they
are called. In addition, in lecture 3 there is a link to a Turtle document with
additional examples of using turtle graphics.
Additional stimulation
Last but not least, add color to the scene. Did someone mention a silvery moon or
was it a golden one! To do this, make a copy of your program and rename it
colorhouse.py. In each function where a color is to be used, add an additional
parameter at the end of the parameter list, say c, for the color. Change each function
call by adding one additional argument to the end for specifying the color, say ‘red’,
or, ‘tan’, or ‘darkgray’ or your choice. Note that a color is simply a string!
Program Submission
Your TA may choose to have each of you execute your final solution, so he can see
that you’ve successfully built this house under a silvery moon. Or, he may request a
formal submission to CourseWeb. Have fun!
