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Learn to use a variety of Java2D classes including GradientPaint.

Revised: Mon Apr 04 10:05:32 CDT 2016

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Table of contents

Preface

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

The program described in this module 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 document in a separate browser window and use the following links to easily find and view the Figures and Listings while you are reading about them.

Figures

Listings

  • Listing 1 . The driver class named Prob03.
  • Listing 2 . Beginning of the class named Prob03Runner.
  • Listing 3 . Beginning of the method named process.
  • Listing 4 . Translate the origin to the center of the image.
  • Listing 5 . Draw the black horizontal and vertical axes.
  • Listing 6 . Draw the solid green filled ellipse in the upper-left quadrant.
  • Listing 7 . Draw a circle with a gradient fill in the upper-right quadrant.
  • Listing 8 . Code for the remaining two quadrants..
  • Listing 9 . Complete program listing.

Preview

In this module you will learn to use the GradientPaint class along with a variety of other Java2D classes.

Program specifications

Write a program named Prob03 that uses the class definition shown in Listing 1 and Ericson's media library along with the image file named Prob03.jpg to produce the graphic output image shown in Figure 1 . (Note that the image in the file named Prob03.jpg is a blank white image. You could also create thisblank image using one of the constructors for the Picture class.)

Figure 1 - Required graphic output.

Image showing four circles with different gradient patterns in each circle.

Circles with gradient paint

The program draws four circles in the quadrants of a Cartesian coordinate system. One is filled with solid green. The other three are filled with cyclicgradient paint from green to blue.

The number of cycles varies in each circle, as do the axes along which the gradient occurs.

The background is set to Color.RED.

New classes

You may define new classes as necessary to cause your program to behave as required, but you may not modify the class definition for the class named Prob03 shown in Listing 1 .

Required text output

In addition to the output image mentioned above, your program must display your name and the other line of text shown in Figure 2 .

Figure 2 - Required text output.
Display your name here. Picture, filename Prob03.jpg height 300 width 300

Discussion and sample code

Will discuss in fragments

I will discuss and explain this program in fragments. A complete listing of the program is provided in Listing 9 near the end of the module.

Questions & Answers

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for screen printed electrodes ?
SUYASH
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s. Reply
of graphene you mean?
Ebrahim
or in general
Ebrahim
in general
s.
Graphene has a hexagonal structure
tahir
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Cied
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Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
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Cied
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
Porter
many many of nanotubes
Porter
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Yasmin
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Cesar
I'm interested in nanotube
Uday
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
AMJAD
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
AMJAD
what is system testing
AMJAD
what is the application of nanotechnology?
Stotaw
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
Azam
anybody can imagine what will be happen after 100 years from now in nano tech world
Prasenjit
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
Azam
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
Prasenjit
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Damian
silver nanoparticles could handle the job?
Damian
not now but maybe in future only AgNP maybe any other nanomaterials
Azam
Hello
Uday
I'm interested in Nanotube
Uday
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
Prasenjit
can nanotechnology change the direction of the face of the world
Prasenjit 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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