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The end of the class
Listing 5 also signals the end of the class named Prob02Runner and the end of the program.
I encourage you to copy the code from Listing 6 . Compile the code and execute it. Experiment with the code, making changes, andobserving the results of your changes. Make certain that you can explain why your changes behave as they do.
Click Prob02a.jpg to download the required input image file for this program.
You learned how to mirror images both horizontally and vertically.
In the next module, you will learn to use a variety of Java2D classes including GradientPaint.
While not a requirement of the course, you can select the following link to view an optional online video lecture on the material in this module.
This section contains a variety of miscellaneous information.
Financial : Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware 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 of the module.
In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. Ineither receive compensation for those sales nor do I know who does receive compensation. If you purchase such a book, please beaware that it is a copy of a module that is freely available on cnx.org and that it was made and published withoutmy prior knowledge.
Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.
A complete listing of the program discussed in this module is shown in Listing 6 below.
| Listing 6 . Complete program listing. |
|---|
/*File Prob02 Copyright 2008 R.G.Baldwin
*********************************************************/import java.awt.Graphics2D;
import java.awt.geom.AffineTransform;import java.awt.geom.Rectangle2D;
import java.awt.Graphics;public class Prob02{
//DO NOT MODIFY THE CODE IN THIS CLASS DEFINITION.public static void main(String[] args){new Prob02Runner().run();
}//end main method}//end class Prob02
//======================================================//class Prob02Runner{
public Prob02Runner(){System.out.println("Display your name here.");
}//end constructor//----------------------------------------------------//
public void run(){Picture pix = new Picture("Prob02a.jpg");
//Add your name and display the output picture.pix.addMessage("Display your name here.",10,20);
//Display the input picture.pix.explore();
pix = rotatePicture(pix,35);pix.explore();
pix = mirrorUpperQuads(pix);pix = mirrorHoriz(pix);
pix.explore();System.out.println(pix);
}//end run//----------------------------------------------------//
private Picture rotatePicture(Picture pix,double angle){
//Set up the rotation transformAffineTransform rotateTransform =
new AffineTransform();rotateTransform.rotate(Math.toRadians(angle),
pix.getWidth()/2,pix.getHeight()/2);
//Get the required dimensions of a rectangle that will// contain the rotated image.
Rectangle2D rectangle2D =pix.getTransformEnclosingRect(rotateTransform);
int resultWidth = (int)(rectangle2D.getWidth());int resultHeight = (int)(rectangle2D.getHeight());
//Set up the translation transform that will translate// the rotated image to the center of the new Picture
// object.AffineTransform translateTransform =
new AffineTransform();translateTransform.translate(
(resultWidth - pix.getWidth())/2,(resultHeight - pix.getHeight())/2);
//Concatenate the two transforms so that the image// will first be rotated around its center and then
// translated to the center of the new Picture object.translateTransform.concatenate(rotateTransform);
//Create a new Picture object to contain the results// of the transformation.
Picture result = new Picture(resultWidth,resultHeight);
//Get the graphics context of the new Picture object,// apply the transform to the incoming picture and
// draw the transformed picture on the new Picture// object.
Graphics2D g2 = (Graphics2D)result.getGraphics();g2.drawImage(pix.getImage(),translateTransform,null);
return result;}//end rotatePicture
//----------------------------------------------------////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 Prob02Runner |
-end-
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