<< Chapter < Page Chapter >> Page >

Call the copyPictureWithCrop method again

Listing 9 begins by calling the copyPictureWithCrop method again. This time, however, the picture shown in Figure 5 is passed as the source image with the same picture as before being passed as thedestination image.

The offset coordinates

In this case, the offset coordinate values specify the upper-left corner of the right-most butterfly image in Figure 3 .

The cropping parameters

The final four parameters that are passed in Listing 9 specify that the entire source picture is to be copied into the destinationpicture.

Display the destination picture

When the copyPictureWithCrop method returns, Listing 9 calls the explore method to display the current state of the destination picture. The result is shown in Figure 3 .

A new array object

Finally, Listing 9 instantiates a new array object, populates it with references to three Picture objects, and returns control to the main method code in Listing 1 returning a reference to the array object in the process.

The code in Listing 1 saves the reference to the array object in the variable named pictures .

Pass Picture object references to println method

Then Listing 1 extracts and passes each of the three Picture object references to the println method causing the last three lines of text shown in Figure 4 to be displayed on the command-line screen.

The second line of output text ( picA ) describes the raw butterfly image shown in Figure 1 .

The third line of output text for ( picB ) describes the beach scene shown in Figure 2 and Figure 3 .

The last line of output text ( picC ) describes the cropped and flipped version of the butterfly image shown in Figure 5 .

Run the program

I encourage you to copy the code from Listing 10 . 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 here and here to download the two required input image files.


In this module, you learned 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.

What's next?

You will learn to write a program to do green-screen processing in the next module.

While not a requirement of the course, you can select the following links to view optional online video lectures on the material in thismodule.


This section contains a variety of miscellaneous information.

Housekeeping material
  • Module name: Java OOP: Cropping, Flipping, and Combining Pictures
  • File: Java3014.htm
  • Published: 08/01/12

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.

Complete program listing

A complete listing of the program discussed in this module is shown in Listing 10 below.

Listing 10 . Complete program listing.
/*File Prob02 Copyright 2008 R.G.Baldwin Revised 12/16/08*********************************************************/ import java.awt.Color;public class Prob02{ public static void main(String[]args){ Picture[]pictures = new Prob02Runner().run(); System.out.println(pictures[0]); System.out.println(pictures[1]); System.out.println(pictures[2]); }//end main method}//end class Prob02 //======================================================//class Prob02Runner{ public Prob02Runner(){//constructorSystem.out.println("Display your name here."); }//end constructor//----------------------------------------------------// public Picture[]run(){ Picture picA = new Picture("Prob02a.jpg");picA.explore(); Picture picB = new Picture("Prob02b.jpg");picB.addMessage("Display your name here.",10,20); picB.explore();Picture picC = cropAndFlip(picA,4,5,80,105); copyPictureWithCrop(picA,picB,82,70,4,5,77,101);copyPictureWithCrop(picC,picB,161,70,0,0,77,101); picB.explore();Picture[] output = {picA,picB,picC};return output; }//end run//----------------------------------------------------// //Crops a picture to the specified coordinate values and// flips it around a vertical line at its center. private Picture cropAndFlip(Picture pic,int x1,int y1,int x2,int y2){ Picture output = new Picture(x2-x1+1,y2-y1+1);int width = output.getWidth(); Pixel pixel = null;Color color = null; for(int col = x1;col<(x2+1);col++){ for(int row = y1;row<(y2+1);row++){ color = pic.getPixel(col,row).getColor();pixel = output.getPixel(width-col+x1-1,row-y1); pixel.setColor(color);}//end inner loop }//end outer loopreturn output; }//end crop and flip//----------------------------------------------------// //Copies part of the source picture into the destination// picture with an offset on both axes after first // confirming that the part will fit. Does nothing if it// won't fit. private void copyPictureWithCrop(Picture source,Picture dest,int xOff, int yOff,int xCoor, int yCoor,int width, int height){//Confirm that source will fit in destination if(((width+xOff)<= dest.getWidth())&&((height+yOff)<= dest.getHeight())){ Pixel pixel = null;Color color = null; for(int col = 0;col<width;col++){ for(int row = 0;row<height;row++){ color = source.getPixel(col + xCoor,row + yCoor).getColor(); pixel = dest.getPixel(col+xOff,row+yOff);pixel.setColor(color); }//end inner loop}//end outer loop }//end if}//end copyPictureWithCrop method }//end class Prob02Runner


Questions & Answers

how to know photocatalytic properties of tio2 nanoparticles...what to do now
Akash Reply
it is a goid question and i want to know the answer as well
Do somebody tell me a best nano engineering book for beginners?
s. Reply
what is fullerene does it is used to make bukky balls
Devang Reply
are you nano engineer ?
what is the Synthesis, properties,and applications of carbon nano chemistry
Abhijith Reply
Mostly, they use nano carbon for electronics and for materials to be strengthened.
is Bucky paper clear?
so some one know about replacing silicon atom with phosphorous in semiconductors device?
s. Reply
Yeah, it is a pain to say the least. You basically have to heat the substarte up to around 1000 degrees celcius then pass phosphene gas over top of it, which is explosive and toxic by the way, under very low pressure.
Do you know which machine is used to that process?
how to fabricate graphene ink ?
for screen printed electrodes ?
What is lattice structure?
s. Reply
of graphene you mean?
or in general
in general
Graphene has a hexagonal structure
On having this app for quite a bit time, Haven't realised there's a chat room in it.
what is biological synthesis of nanoparticles
Sanket Reply
what's the easiest and fastest way to the synthesize AgNP?
Damian Reply
types of nano material
abeetha Reply
I start with an easy one. carbon nanotubes woven into a long filament like a string
many many of nanotubes
what is the k.e before it land
what is the function of carbon nanotubes?
I'm interested in nanotube
what is nanomaterials​ and their applications of sensors.
Ramkumar Reply
what is nano technology
Sravani Reply
what is system testing?
preparation of nanomaterial
Victor Reply
Yes, Nanotechnology has a very fast field of applications and their is always something new to do with it...
Himanshu Reply
good afternoon madam
what is system testing
what is the application of nanotechnology?
In this morden time nanotechnology used in many field . 1-Electronics-manufacturad IC ,RAM,MRAM,solar panel etc 2-Helth and Medical-Nanomedicine,Drug Dilivery for cancer treatment etc 3- Atomobile -MEMS, Coating on car etc. and may other field for details you can check at Google
anybody can imagine what will be happen after 100 years from now in nano tech world
after 100 year this will be not nanotechnology maybe this technology name will be change . maybe aftet 100 year . we work on electron lable practically about its properties and behaviour by the different instruments
name doesn't matter , whatever it will be change... I'm taking about effect on circumstances of the microscopic world
how hard could it be to apply nanotechnology against viral infections such HIV or Ebola?
silver nanoparticles could handle the job?
not now but maybe in future only AgNP maybe any other nanomaterials
I'm interested in Nanotube
this technology will not going on for the long time , so I'm thinking about femtotechnology 10^-15
can nanotechnology change the direction of the face of the world
Prasenjit Reply
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
Privacy Information Security Software Version 1.1a
Berger describes sociologists as concerned with
Mueller Reply
Got questions? Join the online conversation and get instant answers!
QuizOver.com Reply

Get the best Algebra and trigonometry course in your pocket!

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
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Object-oriented programming (oop) with java' conversation and receive update notifications?