How to scaling images in java applet, JAVA Programming

Assignment Help:

How to Scaling Images in java applet?

You can scale an image within a particular rectangle using this version of the drawImage() method:

public boolean drawImage(Image img, int x, int y, int width,
int height, ImageObserver io)

width and height specify the size of the rectangle to scale the image into. All other arguments are the similar as before. If the scale is not in proportion to the size of the image, it can end up looking quite squashed.

To prevent disproportionate scaling use the image's getHeight() and getWidth() methods to denotes the actual size. Then scale appropriately. For examples this is how you would draw an Image scaled through one quarter in each dimension:

g.drawImage(img, 0, 0, img.getWidth(this)/4, img.getHeight(this)/4, this);

This program reads a GIF file in the same directory as the HTML file and displays it at a particular magnification. The name of the GIF file and the magnification factor are specified through PARAMs.
import java.awt.*;
import java.applet.*;

public class MagnifyImage extends Applet {

private Image image;
private int scaleFactor;

public void init() {
String filename = this.getParameter("imagefile");
this.image = this.getImage(this.getDocumentBase(), filename);
this.scaleFactor = Integer.parseInt(this.getParameter("scalefactor"));
}

public void paint (Graphics g) {
int width = this.image.getWidth(this);
int height = this.image.getHeight(this);
scaledWidth = width * this.scaleFactor;
scaledHeight = height * this.scaleFactor;
g.drawImage(this.image, 0, 0, scaledWidth, scaledHeight, this);
}

}
This applet is straightforward. The init() method reads two PARAMs, one the name of the image file, the other the magnification factor. The paint() method computes the scale and then draws the image. 


Related Discussions:- How to scaling images in java applet

Program, write code employe managment

write code employe managment

Non-final functions in java object class, Normal 0 false fals...

Normal 0 false false false EN-US X-NONE X-NONE

What is inheritance in java explain with example, What is Inheritance in ja...

What is Inheritance in java Explain with example? Code reusability is claimed to be a key advantage of object-oriented languages over non-object-oriented languages. Inheritance

Nested if.., WAP to input a 4 digit no and find greatest using nested if

WAP to input a 4 digit no and find greatest using nested if

Explain the concept of multi-threaded- java, Explain the concept of Multi-T...

Explain the concept of Multi-Threaded- JAVA Java has a concept of concurrency wired right in to the language itself. This works out more cleanly than languages where concur

Implement queues - linked list, Implement Queues / Linked List Project D...

Implement Queues / Linked List Project Description: In this project, two kinds of queue are implemented: LinkedQueue implements FIFOQueueInterface { .... } and LLQueueItr imp

What is struts framework, Struts framework is an open-source framework for ...

Struts framework is an open-source framework for producing the web applications in Java EE, based on MVC-2 architecture. It uses and extends the Java Servlet API. Struts are robust

Javascript validation, 1. Obtaining the new script: Download and save the...

1. Obtaining the new script: Download and save the attached comment CGI mailer script form-mail2.pl to your server's cgi-bin directory, and change the permissions on the script t

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd