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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

what is variations in raman spectra for nanomaterials
Jyoti Reply
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
yes that's correct
I think
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
How we are making nano material?
what is a peer
What is meant by 'nano scale'?
What is STMs full form?
scanning tunneling microscope
how nano science is used for hydrophobicity
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
what is differents between GO and RGO?
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
The nanotechnology is as new science, to scale nanometric
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
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 did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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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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