How To Display Image And Show Animation Using Applet In Java

Introduction

In this article we discuss how to display an image and show animation using an Applet in Java.

Displaying Image

Applets are widely used in animation and games. In this we require images to be displayed.

The Graphics class of Java provides a drawImage() method to display an image.

Syntax

The syntax of the drawImage funtion to draw the specified image is:

public abstract boolean drawImage(Image image, int a, int b, ImageObserver observer)

Loading and Displaying Images

Images provide a way to augment the aethetic appeal of a Java program. Java provides support for two common image formats: GIF and JPEG. An image that is in one of these formats can be loaded by using either a URL or a filename.

How to get the object of the image

The java.applet.Applet class provides a method getImage() that returns the image object.

Syntax

The syntax of the getImage funtion to draw the specified image is:

public Image getImage(URL url. String image)
{   }

Some other required methods are:

1. public URL getCodeBased() returns the base URL.

2. public URL getDocumentBase() returns the URL of the document in which the Applet is embedded. 

Example

We must insert this image:

1.jpg

In this example, we show how to insert the image in an Applet. We use the drawImage() method to display the image.

import java.applet.*;

import java.awt.*;

public class ImageGrpcsEx extends Applet

  {

    Image pic;

    public void init()

      {

        pic =getImage(getDocumentBase(),"images.jpeg");

      }

    public void paint(Graphics grp)

      {

        grp.drawImage(pic, 100,30,this);

      }

  }

/*

<applet code="ImageGrpcsEx.class" width="400" height="400">

</applet

*/

Output

fig-1.jpg

Animation in Applet

Applets are widely used in animation and games, for this we need images that must be moved.

Example of animation

import java.awt.*;

import java.applet.*;

public class AnimationEx extends Applet

  {

    Image pic;

    public void init()

      {

        pic=getImage(getDocumentBase(),"images.jpeg");

      }

    public void paint(Graphics grp)

      {

        for(int i=50;i<600;i++)

          {

            grp.drawImage(pic, i,30,this);

            try

              {

                Thread.sleep(400);

              }

            catch(Exception e){}

          }

      }

  }

/*

<applet code="AnimationEx.class" width="400" height="400">

</applet

*/

Output

Animation19.gif

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