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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.
Read also:
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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