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AWT Image Class
Introduction
Image control is superclass for all image classes representing graphical images.
Class declaration
Following is the declaration for java.awt.Image class:
public abstract class Image extends Object
Field
Following are the fields for java.awt.Image class:
protected float accelerationPriority -- Priority for accelerating this image.
static int SCALE_AREA_AVERAGING -- Use the Area Averaging image scaling algorithm.
static int SCALE_DEFAULT -- Use the default image-scaling algorithm.
static int SCALE_FAST -- Choose an image-scaling algorithm that gives higher priority to scaling speed than smoothness of the scaled image.
static int SCALE_REPLICATE -- Use the image scaling algorithm embodied in the ReplicateScaleFilter class.
static int SCALE_SMOOTH -- Choose an image-scaling algorithm that gives higher priority to image smoothness than scaling speed.
static Object UndefinedProperty -- The UndefinedProperty object should be returned whenever a property which was not defined for a particular image is fetched.
Class constructors
S.N. | Constructor & Description |
---|---|
1 | Image() |
Class methods
S.N. | Method & Description |
---|---|
1 | void flush() Flushes all reconstructable resources being used by this Image object. |
2 | float getAccelerationPriority() Returns the current value of the acceleration priority hint. |
3 | ImageCapabilities getCapabilities(GraphicsConfiguration gc) Returns an ImageCapabilities object which can be inquired as to the capabilities of this Image on the specified GraphicsConfiguration. |
4 | abstract Graphics getGraphics() Creates a graphics context for drawing to an off-screen image. |
5 | abstract int getHeight(ImageObserver observer) Determines the height of the image. |
6 | abstract Object getProperty(String name, ImageObserver observer) Gets a property of this image by name. |
7 | Image getScaledInstance(int width, int height, int hints) Creates a scaled version of this image. |
8 | abstract ImageProducer getSource() Gets the object that produces the pixels for the image. |
9 | abstract int getWidth(ImageObserver observer) Determines the width of the image. |
10 | void setAccelerationPriority(float priority) Sets a hint for this image about how important acceleration is. |
Methods inherited
This class inherits methods from the following classes:
java.lang.Object
Image Example
Create the following java program using any editor of your choice in say D:/ > AWT > com > tutorialspoint > gui >
AwtControlDemo.javapackage com.tutorialspoint.gui; import java.awt.*; import java.awt.event.*; public class AwtControlDemo { private Frame mainFrame; private Label headerLabel; private Label statusLabel; private Panel controlPanel; public AwtControlDemo(){ prepareGUI(); } public static void main(String[] args){ AwtControlDemo awtControlDemo = new AwtControlDemo(); awtControlDemo.showImageDemo(); } private void prepareGUI(){ mainFrame = new Frame("Java AWT Examples"); mainFrame.setSize(400,400); mainFrame.setLayout(new GridLayout(3, 1)); mainFrame.addWindowListener(new WindowAdapter() { public void windowClosing(WindowEvent windowEvent){ System.exit(0); } }); headerLabel = new Label(); headerLabel.setAlignment(Label.CENTER); statusLabel = new Label(); statusLabel.setAlignment(Label.CENTER); statusLabel.setSize(350,100); controlPanel = new Panel(); controlPanel.setLayout(new FlowLayout()); mainFrame.add(headerLabel); mainFrame.add(controlPanel); mainFrame.add(statusLabel); mainFrame.setVisible(true); } private void showImageDemo(){ headerLabel.setText("Control in action: Image"); controlPanel.add(new ImageComponent("resources/java.jpg")); mainFrame.setVisible(true); } class ImageComponent extends Component { BufferedImage img; public void paint(Graphics g) { g.drawImage(img, 0, 0, null); } public ImageComponent(String path) { try { img = ImageIO.read(new File(path)); } catch (IOException e) { e.printStackTrace(); } } public Dimension getPreferredSize() { if (img == null) { return new Dimension(100,100); } else { return new Dimension(img.getWidth(), img.getHeight()); } } } }
Compile the program using command prompt. Go to D:/ > AWT and type the following command.
D:\AWT>javac com\tutorialspoint\gui\AwtControlDemo.java
If no error comes that means compilation is successful. Run the program using following command.
D:\AWT>java com.tutorialspoint.gui.AwtControlDemo
Verify the following output