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3.15 Java3014: cropping, flipping, and combining pictures

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Learn to crop, flip, and combine pictures.

Revised: Sun Apr 03 11:56:24 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

  • Figure 1 . Raw butterfly image.
  • Figure 2 . Beach scene with student's name added.
  • Figure 3 . Composite image.
  • Figure 4 . Required text output.
  • Figure 5 . Cropped and flipped version of the butterfly image.
  • Figure 6 . Partially complete version of the output picture.

Listings

  • Listing 1 . The driver class named Prob02.
  • Listing 2 . Beginning of the Prob02Runner class.
  • Listing 3 . Beginning of the run method.
  • Listing 4 . Beginning of the cropAndFlip method.
  • Listing 5 . Process using nested loops.
  • Listing 6 . Call the copyPictureWithCrop method from the run method..
  • Listing 7 . Beginning of the method named copyPictureWithCrop.
  • Listing 8 . Process using nested loops.
  • Listing 9 . The remainder of the run method.
  • Listing 10 . Complete program listing.

Preview

In this module, you will learn how to:

  • Work directly with individual pixels and keep track of coordinate values.
  • Copy a portion of one picture into a specific location in another picture.
  • Crop and flip a picture.

Program specifications

Write a program named Prob02 that uses the class definition shown in Listing 1 and Ericson's media library along with the image files named Prob02a.jpg and Prob02b.jpg to produce the three graphic output images shown in Figure 1 , Figure 2 , and Figure 3 .

Figure 1 - Raw butterfly image.

This is an image of a butterfly that will be superimposed on a beach scene to form a composite image.

Figure 2 - Beach scene with student's name added.

This is an image of a beach scene that will be used to form a composite image.

Figure 3 - Composite image.

This is the composite image with the cropped and flipped images of the butterfly superimposed on the beach scene on each side of center.

May define 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 Prob02 given in Listing 1 .

The facing butterfly images

The two facing images of the butterflies in the final output picture are separated by two pixels and those two images as a pair are centered in thepicture of the beach.

Required text output

In addition to the three output images mentioned above, your program must display your name and the other three lines of text shown in Figure 4 on the command-line screen:

Figure 4 . Required text output.
Display your name here. Picture, filename Prob02a.jpg height 118 width 100Picture, filename Prob02b.jpg height 240 width 320 Picture, filename None height 101 width 77

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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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