JavaMan1.java Applet that loads an image from a relative URL.
*************************************************************
import java.applet.Applet;
import java.awt.*;
/** An applet that loads an image from a relative URL.
*
>>>>>>>>>>>>>>>>>>>
public class JavaMan1 extends Applet {
private Image javaMan;
public void init() {
javaMan = getImage(getCodeBase(),"images/Java-Man.gif");
}
public void paint(Graphics g) {
g.drawImage(javaMan, 0, 0, this);
}
}
>>>>>>>>>>>>>>>>>>>>
JavaMan2.java Illustrates loading an image from an absolute URL.
********************
import java.applet.Applet;
import java.awt.*;
import java.net.*;
/** An applet that loads an image from an absolute
* URL on the same machine that the applet came from.
*
***********************
public class JavaMan2 extends Applet {
private Image javaMan;
public void init() {
try {
URL imageFile = new URL("http://www.corewebprogramming.com" +
"/images/Java-Man.gif");
javaMan = getImage(imageFile);
} catch(MalformedURLException mue) {
showStatus("Bogus image URL.");
System.out.println("Bogus URL");
}
}
public void paint(Graphics g) {
g.drawImage(javaMan, 0, 0, this);
}
}
>>>>>>>>>>>>>>>>>>>>>
# JavaMan3.java An application that loads an image from a local file. Uses the following image and two files:
* Java-Man.gif which should be placed in images subdirectory.
* WindowUtilities.java Simplifies the setting of native look and feel.
* ExitListener.java WindowListener to support terminating the application.
*******************
JavaMan3.java
*******************
import java.awt.*;
import javax.swing.*;
/** An application that loads an image from a local file.
* Applets are not permitted to do this.
*
**********************
class JavaMan3 extends JPanel {
private Image javaMan;
public JavaMan3() {
String imageFile = System.getProperty("user.dir") +
"/images/Java-Man.gif";
javaMan = getToolkit().getImage(imageFile);
setBackground(Color.white);
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawImage(javaMan, 0, 0, this);
}
public static void main(String[] args) {
JPanel panel = new JavaMan3();
WindowUtilities.setNativeLookAndFeel();
WindowUtilities.openInJFrame(panel, 380, 390);
}
}
>>>>>>>>>>>>>>>>>>
Preload.java An application that demonstrates the effect of preloading an image before drawing. Specify -preload as a command-line argument to preload the image. In this case, the prepareImage method is called to immediately start a thread to load the image. Thus, the image is ready to display when the user later selects the Display Image button.
>>>>>>>>>>>>>>>>>>>
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.net.*;
/** A class that compares the time to draw an image preloaded
* (getImage, prepareImage, and drawImage) vs. regularly
* (getImage and drawImage).
*
* The answer you get the regular way is dependent on the
* network speed and the size of the image, but if you assume
* you load the applet "long" (compared to the time the image
* loading requires) before pressing the button, the drawing
* time in the preloaded version depends only on the speed of
* the local machine.
*
**********************
public class Preload extends JPanel implements ActionListener {
private JTextField timeField;
private long start = 0;
private boolean draw = false;
private JButton button;
private Image plate;
public Preload(String imageFile, boolean preload) {
setLayout(new BorderLayout());
button = new JButton("Display Image");
button.setFont(new Font("SansSerif", Font.BOLD, 24));
button.addActionListener(this);
JPanel buttonPanel = new JPanel();
buttonPanel.add(button);
timeField = new JTextField(25);
timeField.setEditable(false);
timeField.setFont(new Font("SansSerif", Font.BOLD, 24));
buttonPanel.add(timeField);
add(buttonPanel, BorderLayout.SOUTH);
registerImage(imageFile, preload);
}
/** No need to check which object caused this,
* since the button is the only possibility.
*/
public void actionPerformed(ActionEvent event) {
draw = true;
start = System.currentTimeMillis();
repaint();
}
// Do getImage, optionally starting the loading.
private void registerImage(String imageFile, boolean preload) {
try {
plate = getToolkit().getImage(new URL(imageFile));
if (preload) {
prepareImage(plate, this);
}
} catch(MalformedURLException mue) {
System.out.println("Bad URL: " + mue);
}
}
/** If button has been clicked, draw image and
* show elapsed time. Otherwise, do nothing.
*/
public void paintComponent(Graphics g) {
super.paintComponent(g);
if (draw) {
g.drawImage(plate, 0, 0, this);
showTime();
}
}
// Show elapsed time in textfield.
private void showTime() {
timeField.setText("Elapsed Time: " + elapsedTime() +
" seconds.");
}
// Time in seconds since button was clicked.
private double elapsedTime() {
double delta = (double)(System.currentTimeMillis() - start);
return(delta/1000.0);
}
public static void main(String[] args) {
JPanel preload;
if (args.length == 0) {
System.out.println("Must provide URL");
System.exit(0);
}
if (args.length == 2 && args[1].equals("-preload")) {
preload = new Preload(args[0], true);
} else {
preload = new Preload(args[0], false);
}
WindowUtilities.setNativeLookAndFeel();
WindowUtilities.openInJFrame(preload, 1000, 750);
}
}
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Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10384
Categories:Programming Code Examples, Java/J2EE/J2ME, Applets and Basic Graphics
Tags:Java/J2EE/J2MEApplets and Basic Graphics
Post Data:2017-01-02 16:04:39
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