3.23 Java3022r review

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This module contains review questions and answers keyed to the module titled Java3022: Scaling, Rotating, and Translating Images using Affine Transforms.

Revised: Mon Apr 04 09:07:14 CDT 2016

Preface

This module contains review questions and answers keyed to the module titled Java3022: Scaling, Rotating, and Translating Images using Affine Transforms .

The questions and the answers are connected by hyperlinks to make it easy for you to navigate from the question to the answer and back again.

Question 1.

Given the input image in Figure 1 , which of the following output images is produced by the code in Listing 1 ?

A. Figure 2

B. Figure 3

Listing 1 - Question 1.
```/*File Java3022ra Copyright 2013 R.G.Baldwin Revised 02/17/13*********************************************************/ import java.awt.Graphics2D;import java.awt.geom.AffineTransform; import java.awt.geom.Rectangle2D;import java.awt.Graphics; public class Java3022ra{public static void main(String[] args){new Java3022raRunner().run(); }//end main method}//end class Java3022ra //======================================================//class Java3022raRunner{ public void run(){procPix(new Picture("Prob01.jpg").scale(0.7,0.7),-30); }//end run//----------------------------------------------------// private void procPix(Picture pic,double angle){AffineTransform xformA = new AffineTransform(); xformA.rotate(Math.toRadians(angle),pic.getWidth()/2,pic.getHeight()/2); Rectangle2D rectangle2D =pic.getTransformEnclosingRect(xformA); int resultWidth = (int)(rectangle2D.getWidth());int resultHeight = (int)(rectangle2D.getHeight()); AffineTransform xformB = new AffineTransform();xformB.translate((resultWidth - pic.getWidth())/2, (resultHeight - pic.getHeight())/2);xformB.concatenate(xformA); Picture result = new Picture(resultWidth,resultHeight); Graphics2D g2 = (Graphics2D)result.getGraphics();g2.drawImage(pic.getImage(),xformB,null); result.explore();}//end //----------------------------------------------------//}//end class Java3022raRunner```

Figure 1 - Prob01.jpg.

Figure 2 - Possible output image.

Figure 3 - Possible output image.

Listings

What is the meaning of the following two images?

This image was inserted here simply to insert some space between the questions and the answers to keep them from being visible on the screen at thesame time.

The image is also an example of the kinds of things that we do in my course titled ITSE 2321, Object-Oriented Programming.

This image was also inserted for the purpose of inserting space between the questions and the answers.

The code in Listing 1 produces the output image shown in Figure 3 .

Miscellaneous

This section contains a variety of miscellaneous information.

Housekeeping material
• Module name: Java3022r Review
• File: Java3022r.htm
• Published: 02/17/13
Disclaimers:

Financial : Although the Connexions site makes it possible for you to download aPDF file for this module at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, youshould be aware that some of the HTML elements in this module may not translate well into PDF.

I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version ofthe module.

In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale onAmazon.com showing me as the author. I neither receive compensation for those sales nor do I know who does receive compensation. If youpurchase such a book, please be aware that it is a copy of a module that is freely available on cnx.org and that it was made andpublished without my prior knowledge.

Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.

-end-

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