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This module contains review questions and answers keyed to the module titled Java3012: Using Nested Loops to Process Pixels.

Revised: Sun Apr 03 11:21:18 CDT 2016

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Table of contents

Preface

This module contains review questions and answers keyed to the module titled Java3012: Using Nested Loops to Process Pixels .

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.

Questions

Question 1 .

True or False? The code shown in Listing 1 will transform the image shown in Figure 1 into the image shown in Figure 2 .

Listing 1 . Question 1.
/*File Java3012ra Copyright 2008 R.G.Baldwin Revised 02/14/13*********************************************************/ public class Java3012ra{public static void main(String[] args){new Java3012raRunner().run(); }//end main method}//end class Java3012ra //======================================================//class Java3012raRunner{ public Java3012raRunner(){System.out.println("Display your name here."); }//end constructor//----------------------------------------------------// public void run(){Picture pix = new Picture("Java3012ra.jpg"); //Call the mirrorUpperQuads method to modify the top// half of the picture. pix = mirrorUpperQuads(pix);//Mirror the top half into the bottom half. pix = mirrorHoriz(pix);//Add your name and display the output picture. pix.addMessage("Display your name here.",10,20);pix.explore(); }//end run//----------------------------------------------------////This method mirrors the upper-left quadrant of a // picture into the upper-right quadrant.private Picture mirrorUpperQuads(Picture pix){ Pixel leftPixel = null;Pixel rightPixel = null; int midpoint = pix.getWidth()/2;int width = pix.getWidth(); for(int row = 0;row<pix.getHeight()/2;row++){ for(int col = 0;col<midpoint;col++){ leftPixel = pix.getPixel(col,row);rightPixel = pix.getPixel(width-1-col,row);rightPixel.setColor(leftPixel.getColor()); }//end inner loop}//end outer loop return pix;}//end mirrorUpperQuads //----------------------------------------------------////This method mirrors the top half of a picture into // the bottom half.private Picture mirrorHoriz(Picture pix){ Pixel topPixel = null;Pixel bottomPixel = null; int midpoint = pix.getHeight()/2;int height = pix.getHeight(); for(int col = 0;col<pix.getWidth();col++){ for(int row = 0;row<midpoint;row++){ topPixel = pix.getPixel(col,row);bottomPixel = pix.getPixel(col,height-1-row);bottomPixel.setColor(topPixel.getColor()); }//end inner loop}//end outer loop return pix;}//end mirrorHoriz //----------------------------------------------------//}//end class Java3012raRunner

Figure 1 - Image from the file named Java3012ra.jpg.

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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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