<< Chapter < Page Chapter >> Page >

There is nothing new in Listing 8 . You should be able to correlate the code in Listing 8 and the drawing parameters in Listing 7 with the steps presented earlier to understand how the program named Parabola01 produces the output image shown in Figure 6 .

A cubic

The program named Cubic01 shown in Listing 17 produces the graphic output shown in Figure 9

Figure 9. Graphic output from the program named Cubic01.

Missing image

About the only thing that is different between the program named Parabola01 and the program named Cubic01 is the methodnamed function . In the program named Parabola01 , the method computes and returns the square of the incoming x-value. In theprogram named Cubic01 , the method computes and returns the cube of the incoming x-value. Just about everything that was said about Parabola01 also applies to Cubic01 .

A circle

There are several ways to graph all of the functions discussed in this lesson. The previous sections have illustrated only one way -- using a turtle tograph the function. I will illustrate the following two ways to graph a circle in this section and will compare some of the advantages and disadvantages of each approach :

  • Using a turtle to graph the function
  • Accessing and setting pixel colors

First approach

The first approach that I will present and explain uses a turtle to graph a circle. This program is very similar to the program named Parabola01 , but there are a few differences. I will explain those differences.

The program named Circle01 shown in Listing 18 produces the graphic output shown in Figure 10 .

Figure 10. Graphic output from the program named Circle01.

Missing image

The first difference that is worthy of note is shown by the lines of code involving the variable named rVal in Listing 9 .

Listing 9 . The variable named rVal. double rVal = 0.6;//radius relative to 1.0 double yVal = 0;int row = 0; int col = 0;double xVal = -rVal; double xInc = 2*rVal/100;turtle.setPenColor(Color.BLUE);

The variable named rVal is used to specify the radius of the circle relative to a value of 1.0 as declared and initialized in Listing 9 .

In the previous sections, we have evaluated our equation for a set of 101 x values ranging from -1.0 to +1.0. For the case of the circle, we will evaluatethe equation for a set of 101 x values ranging from -rVal to +rVal . ( There is no point in evaluating the equation outside of the circle.)

The code in Listing 9 declares and initializes the variable named rVal . Further down, the code sets the initial value for xVal to -rVal . Below that, the code sets the x-increment ( xInc ) to the diameter of the circle divided by 100. This will cause the equation for the circle to beevaluated at 101 points from left to right across the circle shown in Figure 10 .

The method named function for Circle01

The method named function is shown in Listing 10 .

This method evaluates and returns the y-value for each incoming x-value for a circle with no offset, centered at the origin.The method evaluates the standard equation for a circle given by

radius*radius = x*x + y*y

Note that unlike the function method for Parabola01 and Cubic01 , this method requires two incoming parameters: the radius and the current x-value.

Questions & Answers

Application of nanotechnology in medicine
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.
Damian
yes that's correct
Professor
I think
Professor
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
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
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
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
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
anyone know any internet site where one can find nanotechnology papers?
Damian Reply
research.net
kanaga
sciencedirect big data base
Ernesto
Introduction about quantum dots in nanotechnology
Praveena Reply
hi
Loga
what does nano mean?
Anassong Reply
nano basically means 10^(-9). nanometer is a unit to measure length.
Bharti
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Good
Got questions? Join the online conversation and get instant answers!
Jobilize.com Reply

Get the best Algebra and trigonometry course in your pocket!





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
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Object-oriented programming (oop) with java' conversation and receive update notifications?

Ask