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This lesson explains programs that use a Turtle object to graph a straight line, a parabola, a cubic, a circle, and a cosine. The lesson also shows you how to graph a circle without using a Turtle object and compares the two approaches.

Revised: Wed Jun 29 13:31:10 CDT 2016

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Table of contents


This lesson is one of a series of lessons designed to teach you about Object-Oriented Programming (OOP) using Java.

Before embarking on the material in this lesson, you should have studied and should understand all of the material in the lessons identified as Java1600 through Java1630 in the section of this book titled Essence of OOP . You should have studied and should understand the material in the lesson titled Java3002: Creating and Manipulating Turtles and Pictures in a World Object . You should also have studied and should understand all of the material in the following books:

The program described in this lesson requires the use of the Guzdial-Ericson multimedia class library. You will find download, installation, and usageinstructions for the library at Java OOP: The Guzdial-Ericson Multimedia Class Library .

Viewing tip

I recommend that you open another copy of this lesson in a separate browser window and use the following links to easily find and view the Figuresand Listings while you are reading about them.


  • Figure 1 . Two turtles in a World object.
  • Figure 2 . Graph of a cubic function.
  • Figure 3 . Program output for Line01.
  • Figure 4 . Line01 output with different scaling.
  • Figure 5 . Program output for Line01 for a 400x150 world.
  • Figure 6 . Graphic output from the program named Parabola01.
  • Figure 7 . Parabola with zero offsets.
  • Figure 8 . A parabola with offsets.
  • Figure 9 . Graphic output from the program named Cubic01.
  • Figure 10 . Graphic output from the program named Circle01.
  • Figure 11 . Graphic output from the program named Circle02.
  • Figure 12 . Graphic output from the program named Cosine01.


Questions & Answers

Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
what school?
biomolecules are e building blocks of every organics and inorganic materials.
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
sciencedirect big data base
Introduction about quantum dots in nanotechnology
Praveena Reply
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
do you think it's worthwhile in the long term to study the effects and possibilities of nanotechnology on viral treatment?
Damian Reply
absolutely yes
how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
characteristics of micro business
for teaching engĺish at school how nano technology help us
Do somebody tell me a best nano engineering book for beginners?
s. Reply
there is no specific books for beginners but there is book called principle of nanotechnology
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
fullerene is a bucky ball aka Carbon 60 molecule. It was name by the architect Fuller. He design the geodesic dome. it resembles a soccer ball.
what is the actual application of fullerenes nowadays?
That is a great question Damian. best way to answer that question is to Google it. there are hundreds of applications for buck minister fullerenes, from medical to aerospace. you can also find plenty of research papers that will give you great detail on the potential applications of fullerenes.
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
carbon nanotubes has various application in fuel cells membrane, current research on cancer drug,and in electronics MEMS and NEMS etc
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
Got questions? Join the online conversation and get instant answers!
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Source:  OpenStax, Object-oriented programming (oop) with java. OpenStax CNX. Jun 29, 2016 Download for free at https://legacy.cnx.org/content/col11441/1.201
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