I'm fairly new to java, so i don't think I have this fairly close to right, but I can seem to find any other help with this. Basically, I'm trying to animate a jPanel's background color so that it's hue (I'm using an hsb color model) changes. sort of like this: https://kahoot.it/#/ notice how the color kinda floats from one to another. Here is my code that I have so far:
public void animate(){
for(float i=.001f;i<1f;i+=.001f){
jPanel1.setBackground(Color.getHSBColor(i, .53f, .97f));
try{
Thread.sleep(5L);
}catch(InterruptedException ex){
}
System.out.println(i);
}
}
now i know this probably isn't right, but the loop works fine, the only problem is that the jPanel doesn't "update" until the loop is finished. Sorry all for being a huge noob at stuff like this, and thanks for any responses
The problem is that you are blocking the event dispatch thread, so no drawing can happen. Use a swing Timer instead of sleeping. A running example of changing HSB colors:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.Timer;
public class ColorCycle {
private static class ColorPanel extends JPanel {
private final float stepSize;
private final Timer timer;
private int index;
ColorPanel(final int steps, int fps) {
stepSize = 1f / steps;
timer = new Timer(1000 / fps, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
index++;
if (index > steps) {
index = 0;
}
repaint();
}
});
}
void start() {
timer.start();
}
#Override
public Dimension getPreferredSize() {
return new Dimension(100, 100);
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
g.setColor(Color.getHSBColor(index * stepSize, 1f, 1f));
g.fillRect(0, 0, getWidth(), getHeight());
}
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame("Colors");
ColorPanel panel = new ColorPanel(300, 20);
frame.getContentPane().add(panel);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationByPlatform(true);
frame.pack();
frame.setVisible(true);
panel.start();
}
});
}
}
Works for me...
import java.awt.Color;
import java.lang.reflect.InvocationTargetException;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
public class HsbBackground {
public static void main(String[] args) throws Exception {
new HsbBackground();
}
private JPanel jPanel1 = new JPanel();
public HsbBackground() throws InvocationTargetException, InterruptedException {
SwingUtilities.invokeAndWait(new Runnable() {
#Override
public void run() {
JFrame jFrame = new JFrame();
jFrame.setContentPane(jPanel1);
jFrame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
jFrame.setSize(400, 300);
jFrame.setVisible(true);
}
});
animate();
}
public void animate() {
for (float i = .001f; i < 1f; i += .001f) {
final float j = i;
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
jPanel1.setBackground(Color.getHSBColor(j, .53f, .97f));
}
});
try {
Thread.sleep(5L);
} catch (InterruptedException ex) {
}
System.out.println(i);
}
}
}
Make sure, that you call setVisible of your frame before you start your loop.
PS: I updated the code, so that GUI changes are all made from the event dispatching thread. The code still works fine.
Related
I am trying to make elements of an array to be displayed in different locations with random time periods (with fade in and fade out effect).
What i ve done so far, made an array of text labels. Made transitions. But i can't figure out, how to create a for loop that will display other labels in different locations on JFrame. And they should not appear all at the same time but one after another.
Please, help out?
Here is my code:
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class FadingLabel {
private int alpha = 255;
private int increment = -5;
public JLabel label = new JLabel("Fading Label");
public JLabel label2 = new JLabel("Fading Label 2");
public JLabel label3 = new JLabel("Fading Label 3");
public JLabel label4 = new JLabel("Fading Label 4");
JLabel labels[] = new JLabel[]{ label, label2, label3 };
Dimension size = label.getPreferredSize();
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new FadingLabel().makeUI();
}
});
}
public void makeUI() {
new Timer(80, new ActionListener() {
public void actionPerformed(ActionEvent e) {
for (int i = 0; i <= 3; i++){
alpha += increment;
if (alpha >= 255) {
alpha = 255;
increment = -increment;
}
if (alpha <= 0) {
try {
Thread.sleep(100);
} catch (InterruptedException interruptedException) {
interruptedException.printStackTrace();
}
alpha = 0;
increment = -increment;
}
label3.setForeground(new Color(0, 0, 0, alpha));
label3.setLocation(50,60);
}
}
}).start();
JFrame frame = new JFrame();
frame.add(labels[2]);
frame.setPreferredSize(new Dimension(700,500));
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
}
Animation is hard, good animation is harder.
A stepped animation (like you've done) is not particularly efficient and can suffer from interruptions (from the OS or other parts of the system) and can be difficult to scale.
Instead, you should aim for a "duration" based animation. Where something happens over a given period of time, this way, you can more easily drop frames you can't render.
One of the difficult concepts to get around is the idea that you can't perform long running or blocking operations in the "main thread" of the GUI, but neither can you update UI from outside of the "main thread" (in Swing this is known as the Event Dispatching Thread).
So, instead, you need some way monitor each label and as it fades out, start the next label fading in. This is where a good observer pattern (AKA listener) comes in.
import java.awt.AlphaComposite;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.time.Duration;
import java.time.Instant;
import java.util.EventListener;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.border.EmptyBorder;
public class Main {
public static void main(String[] args) {
new Main();
}
public Main() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private FadableLabel[] labels = new FadableLabel[]{
new FadableLabel("A long time ago"),
new FadableLabel("in a galaxy far, far, away..."),
new FadableLabel("It is a period of civil war."),
new FadableLabel("Rebel spaceships striking from a hidden base,"),
new FadableLabel("have won their first victory against the evil Galactic Empire"),
new FadableLabel("During the battle,"),
new FadableLabel("Rebel spies managed to steal secret plans to the Empire's ultimate weapon,"),
new FadableLabel("the Death Star")
};
private int labelIndex = -1;
public TestPane() {
setBorder(new EmptyBorder(50, 50, 50, 50));
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
for (FadableLabel label : labels) {
label.setAlpha(0);
add(label, gbc);
}
}
#Override
public void addNotify() {
super.addNotify();
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
nextLabel();
}
});
}
#Override
public void removeNotify() {
super.removeNotify();
}
protected void nextLabel() {
labelIndex++;
if (labelIndex >= labels.length) {
return;
}
FadableLabel label = labels[labelIndex];
label.addFadableLableListener(new FadableLableListener() {
#Override
public void didFadeLabelIn(FadableLabel label) {
Timer timer = new Timer(1000, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
label.fadeOut();
}
});
timer.setRepeats(false);
timer.start();
}
#Override
public void didFadeLabelOut(FadableLabel label) {
label.removeFadableLableListener(this);
nextLabel();
}
});
label.fadeIn();
}
}
public interface FadableLableListener extends EventListener {
public void didFadeLabelIn(FadableLabel label);
public void didFadeLabelOut(FadableLabel label);
}
public class FadableLabel extends JLabel {
private float alpha = 1.0f;
private Timer fadeTimer;
private FadeRange fadeRange;
private Instant fadeStartedAt;
private Duration desiredFadeTime = Duration.ofMillis(1000);
public FadableLabel() {
super();
}
public FadableLabel(String text) {
super(text);
}
public void addFadableLableListener(FadableLableListener listener) {
listenerList.add(FadableLableListener.class, listener);
}
public void removeFadableLableListener(FadableLableListener listener) {
listenerList.remove(FadableLableListener.class, listener);
}
public float getAlpha() {
return alpha;
}
public void setAlpha(float alpha) {
this.alpha = alpha;
repaint();
}
protected void fireDidFadeOut() {
FadableLableListener[] listeners = listenerList.getListeners(FadableLableListener.class);
if (listeners.length == 0) {
return;
}
for (FadableLableListener listener : listeners) {
listener.didFadeLabelOut(this);
}
}
protected void fireDidFadeIn() {
FadableLableListener[] listeners = listenerList.getListeners(FadableLableListener.class);
if (listeners.length == 0) {
return;
}
for (FadableLableListener listener : listeners) {
listener.didFadeLabelIn(this);
}
}
protected void stopFadeTimer() {
if (fadeTimer != null) {
fadeStartedAt = null;
fadeTimer.stop();
}
}
protected void startFadeTimer() {
if (fadeRange == null) {
throw new RuntimeException("Fade range can not be null when starting animation");
}
fadeStartedAt = Instant.now();
fadeTimer = new Timer(5, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
Duration runTime = Duration.between(fadeStartedAt, Instant.now());
double progress = Math.min(1d, Math.max(0d, runTime.toMillis() / (double) desiredFadeTime.toMillis()));
setAlpha(fadeRange.valueAt(progress));
if (progress >= 1.0) {
stopFadeTimer();
if (getAlpha() >= 1.0) {
fireDidFadeIn();
} else {
fireDidFadeOut();
}
}
}
});
fadeTimer.start();
}
public void fadeIn() {
stopFadeTimer();
if (alpha < 1.0) {
fadeRange = new FadeRange(alpha, 1.0f);
startFadeTimer();
}
}
public void fadeOut() {
stopFadeTimer();
if (alpha > 0.0) {
fadeRange = new FadeRange(alpha, 0);
startFadeTimer();
}
}
#Override
protected void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.setComposite(AlphaComposite.SrcOver.derive(alpha));
super.paintComponent(g2d);
g2d.dispose();
}
protected class FadeRange {
private float from;
private float to;
public FadeRange(float from, float to) {
this.from = from;
this.to = to;
}
public float getFrom() {
return from;
}
public float getTo() {
return to;
}
public float getDistance() {
return getTo() - getFrom();
}
public float valueAt(double progress) {
double distance = getDistance();
double value = distance * progress;
value += getFrom();
return (float) value;
}
}
}
}
Now, to your next problem. A poor approach might be to use an "absolute" or "null" layout
A better choice would be to either make use of something like GridBagLayout (and possibly EmptyLayout) and randomise the Insets of the GridBagConstraints. Alternatively, you could create your own layout manager to do the job for you
See Absolute Positioning Graphic JPanel Inside JFrame Blocked by Blank Sections and Moving JPasswordField to absolute position for some ideas
A cray example
When I say animation is "hard" and it can become complicated very fast, I'm not kidding. To that I end I wrote myself an animation library, which does all the things I keep finding myself doing.
https://github.com/RustyKnight/SuperSimpleSwingAnimationFramework
So, this is an example, based on the above library, which moves the label across a random range, while it's been faded in/out. Without the above library, this kind of work would be, a lot.
import java.awt.AlphaComposite;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.time.Duration;
import java.util.EventListener;
import java.util.Random;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import org.kaizen.animation.Animatable;
import org.kaizen.animation.AnimatableAdapter;
import org.kaizen.animation.DefaultAnimatableDuration;
import org.kaizen.animation.curves.AnimationCurve;
import org.kaizen.animation.curves.Curves;
import org.kaizen.animation.ranges.AnimatableRange;
import org.kaizen.animation.ranges.FloatAnimatableRange;
import org.kaizen.animation.ranges.FloatRange;
import org.kaizen.animation.ranges.PointAnimatableRange;
import org.kaizen.animation.ranges.PointRange;
public class Main {
public static void main(String[] args) {
new Main();
}
public Main() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
private String[] textValues = new String[] {
"A long time ago",
"in a galaxy far, far, away...",
"It is a period of civil war.",
"Rebel spaceships striking from a hidden base,",
"have won their first victory against the evil Galactic Empire",
"During the battle,",
"Rebel spies managed to steal secret plans to the Empire's ultimate weapon,",
"the Death Star"
};
private int labelIndex = -1;
// You'd need two if you wanted to do cross fades
private FadableLabel label;
private Random rnd = new Random();
// The desired duration of the animation, 1 second for fade in,
// 1 second for fade out and 1 second for delay between swicthing state
private Duration desiredDuration = Duration.ofSeconds(3);
// The desired animation curve (ease in/out)
private AnimationCurve curve = Curves.SINE_IN_OUT.getCurve();
// The movement animator
private DefaultAnimatableDuration animator;
public TestPane() {
setLayout(null);
label = new FadableLabel();
label.setAlpha(0);
add(label);
label.addFadableLableListener(new FadableLableListener() {
#Override
public void didFadeLabelIn(FadableLabel label) {
Timer timer = new Timer(1000, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
label.fadeOut();
}
});
timer.setRepeats(false);
timer.start();
}
#Override
public void didFadeLabelOut(FadableLabel label) {
nextText();
}
});
}
#Override
public Dimension getPreferredSize() {
return new Dimension(800, 400);
}
#Override
public void addNotify() {
super.addNotify();
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
nextText();
}
});
}
#Override
public void removeNotify() {
stopAnimation();
super.removeNotify();
}
protected void stopAnimation() {
if (animator != null) {
animator.stop();
}
}
protected void nextText() {
stopAnimation();
labelIndex++;
if (labelIndex >= textValues.length) {
return;
}
String text = textValues[labelIndex];
label.setText(text);
label.setSize(label.getPreferredSize());
// Randomise the from and to locations
Point from = new Point(rnd.nextInt(getWidth() - label.getSize().width), rnd.nextInt(getHeight() - label.getSize().height));
Point to = new Point(rnd.nextInt(getWidth() - label.getSize().width), rnd.nextInt(getHeight() - label.getSize().height));
// Generate the range
PointRange range = new PointRange(from, to);
// Setup an animatable range of the PointRange
animator = new PointAnimatableRange(range, desiredDuration, curve, new AnimatableAdapter<Point>() {
#Override
public void animationChanged(AnimatableRange<Point> animatable) {
label.setLocation(animatable.getValue());
}
});
label.setLocation(from);
// Make it so
label.fadeIn();
animator.start();
}
}
public interface FadableLableListener extends EventListener {
public void didFadeLabelIn(FadableLabel label);
public void didFadeLabelOut(FadableLabel label);
}
public class FadableLabel extends JLabel {
private FloatAnimatableRange animator;
private AnimationCurve curve = Curves.SINE_IN_OUT.getCurve();
private Duration desiredDuration = Duration.ofSeconds(1);
private float alpha = 1.0f;
public FadableLabel() {
super();
}
public FadableLabel(String text) {
super(text);
}
public void addFadableLableListener(FadableLableListener listener) {
listenerList.add(FadableLableListener.class, listener);
}
public void removeFadableLableListener(FadableLableListener listener) {
listenerList.remove(FadableLableListener.class, listener);
}
public float getAlpha() {
return alpha;
}
public void setAlpha(float alpha) {
this.alpha = alpha;
repaint();
}
protected void fireDidFadeOut() {
FadableLableListener[] listeners = listenerList.getListeners(FadableLableListener.class);
if (listeners.length == 0) {
return;
}
for (FadableLableListener listener : listeners) {
listener.didFadeLabelOut(this);
}
}
protected void fireDidFadeIn() {
FadableLableListener[] listeners = listenerList.getListeners(FadableLableListener.class);
if (listeners.length == 0) {
return;
}
for (FadableLableListener listener : listeners) {
listener.didFadeLabelIn(this);
}
}
protected void stopFadeTimer() {
if (animator != null) {
animator.stop();
}
}
protected void startFadeTimer(FloatRange range, AnimationListener animationListener) {
stopFadeTimer();
animator = new FloatAnimatableRange(range, desiredDuration, curve, new AnimatableAdapter<Float>() {
#Override
public void animationChanged(AnimatableRange<Float> animatable) {
alpha = animatable.getValue();
repaint();
}
#Override
public void animationCompleted(Animatable animator) {
if (animationListener != null) {
animationListener.animationCompleted();
}
}
});
animator.start();
}
public void fadeIn() {
stopFadeTimer();
startFadeTimer(new FloatRange(alpha, 1f), new AnimationListener() {
#Override
public void animationCompleted() {
fireDidFadeIn();
}
});
}
public void fadeOut() {
stopFadeTimer();
startFadeTimer(new FloatRange(alpha, 0f), new AnimationListener() {
#Override
public void animationCompleted() {
fireDidFadeOut();
}
});
}
#Override
protected void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.setComposite(AlphaComposite.SrcOver.derive(alpha));
super.paintComponent(g2d);
g2d.dispose();
}
protected interface AnimationListener {
public void animationCompleted();
}
}
}
The library is based on Netbeans, it wouldn't be hard to just extract the source into some other IDE.
Swing based "perform after delay"
made up silly solution, #MadProgrammer. added Thread.sleep(ms); in removeFadeableLabelListener. it works but i believe there is much brighter and smart solution. could you show please how to use delay timer for such task?
Don't, ever, use Thread.sleep from within the Event Dispatching Thread. This is going to cause a cascade of issues which will basically make you program look like it's frozen (because, essentially, it is)
Instead, you need to become familiar with the mechanisms you have available to you via the API. You could use a SwingWorker, but a simpler solution might be to just use a non-repeating Swing Timer, which is demonstrated above.
import java.awt.EventQueue;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.time.Duration;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.border.EmptyBorder;
public class Main {
public static void main(String[] args) {
new Main();
}
public Main() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
JButton btn = new JButton("Click me");
btn.addActionListener(new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
btn.setText("...");
SwingHelper.after(Duration.ofSeconds(1), new Runnable() {
#Override
public void run() {
btn.setEnabled(false);
btn.setText("Don't do that");
}
});
}
});
setBorder(new EmptyBorder(10, 10, 10, 10));
setLayout(new GridBagLayout());
add(btn);
}
}
public class SwingHelper {
public static void after(Duration duration, Runnable runnable) {
Timer timer = new Timer((int)duration.toMillis(), new ActionListener() {
#Override
public void actionPerformed(ActionEvent e) {
runnable.run();
}
});
timer.setRepeats(false);
timer.start();
}
}
}
In my first program repaint work corectly, but in the second program i have a problem with it.
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class repaint1 {
public static void main(String[] args) {
JFrame win = new JFrame("");
test1 content = new test1();
win.setContentPane(content);
win.setSize(600, 400);
win.setLocation(100, 100);
win.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
win.setResizable(false);
win.setVisible(true);
content.function();
}
}
class test1 extends JPanel {
private BufferedImage img;
public int x = 50;
public int y = 50;
public test1() {
}
public void function() {
try {
Thread.sleep(1000);
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
for (int i = 50; i < 150; i++) {
x = i;
y = i;
try {
Thread.sleep(10);
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
repaint();
}
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
try {
img = ImageIO.read(new File("images.jpg"));
g.drawImage(img, x, y, null);
} catch (IOException ex) {
// handle exception...
}
}
}
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
public class repaint2 {
public static void main(String[] args) {
JFrame f = new JFrame("JFrame");
test2 content = new test2();
f.setContentPane(content);
f.setSize(600, 400);
f.setLocation(100, 100);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setResizable(false);
f.setVisible(true);
}
}
class test2 extends JPanel {
private BufferedImage img;
public int x = 50;
public int y = 50;
public test2() {
JButton button = new JButton("Start !");
button.setBounds(458, 24, 122, 23);
button.setVisible(true);
add(button);
button.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
// Execute when button is pressed
function();
}
});
}
public void function() {
for (int i = 50; i < 150; i++) {
x = i;
y = i;
repaint();
try {
Thread.sleep(10);
} catch (InterruptedException ex) {
Thread.currentThread().interrupt();
}
}
}
#Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
try {
img = ImageIO.read(new File("images.jpg"));
g.drawImage(img, x, y, null);
} catch (IOException ex) {
// handle exception...
}
}
}
In the first case the function() method is invoked from the main Thread, so when you invoke sleep() this Thread sleeps, which does not affect painting of the GUI.
In the second case your function() method is invoked from the ActionListener. All code executed from a listener is invoked on the Event Dispatch Thread (EDT), which is responsible for repainting the GUI. When you tell the Thread to sleep() the EDT sleeps, so it can't repaint the GUI until the loop finishes executing.
In your ActionListener code you need to start a separate Thread. One way to do this is to use a SwingWorker.
Read the section from the Swing tutorial on Concurrency for more information.
To move your image every time you need to use implements Runnable in your JPanel class. Here this class (MyJPanleClass) will behave like both as JPanel and Thread.
public class MyJPanleClass extends JPanel implements Runnable{
public MyJPanleClass(){
//constractor
}
#Override
public void paintComponent(Graphics g) {
super.paintComponent(g);
//do your staff with g
}
#Override
public void run(){
repaint();
}
}
To execute it from main class just write this code:
MyJPnaleClass jp=new MyJPanelClass();
Thread t1=new Thread(jp);
t1.start();//this will call run class
try{
t1.join();//running the thread until it finish.
}catch(Exception ex){}
If you don't have any idea about thread just follow the link to learn it: Thread in java tutorial
I am gone through some of code java applet and animation, i write the following code :
import java.applet.*;
import java.awt.*;
/*<applet code="AppletDemo" width = 200 height = 100></applet>
*/
public class AppletDemo extends Applet implements Runnable
{
String msg = "Text Animating from right to left...";
Thread t = null;
int state;
boolean stopFlag;
int msgX = 200;
String s;
boolean diff;
public void init()
{
setBackground(Color.cyan);
setForeground(Color.black);
}
public void start()
{
t = new Thread(this);
stopFlag = false;
t.start();
s = "abc";
diff = s.equalsIgnoreCase("abc");
}
public void run()
{
while (true)
{
try{
if(msgX>=-150)
msgX--;
else
msgX =200;
Thread.sleep(10);
repaint();
}
catch(Exception e)
{}
}
}
public void paint(Graphics g)
{
g.drawString(msg,msgX,20);
showStatus(diff+"Text at "+msgX+",20");
}
}
What is happening is that when i put Thread.sleep(100), it works fine but when i try to animate faster that is Thread.sleep(10) it starts flickering , i couldn't understand what is happening can anyone help.
Don't directly paint over top level container. Use JPanel to paint on it.
Don't use Thread.sleep(). It's better to use Swing Timer for animation.
Override paintComponent() method of JPanel for custom painting.
Don't forget to call super.paintComponent() inside overridden paintComponent method.
Instead of infinite loop try with Swing Timer.
Please have a look at How to Use Swing Timers
sample code:
import java.applet.Applet;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JPanel;
import javax.swing.Timer;
/*
* <applet code="AppletDemo" width = 200 height = 100></applet>
*/
public class AppletDemo extends Applet {
String msg = "Text Animating from right to left...";
int state;
boolean stopFlag;
int msgX = 200;
String s;
boolean diff;
JPanel panel;
public void init() {
setBackground(Color.cyan);
setForeground(Color.black);
panel = new JPanel() {
#Override
public void paintComponent(Graphics g) {
super.paintComponents(g);
g.drawString(msg, msgX, 20);
showStatus(diff + "Text at " + msgX + ",20");
}
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 40);
}
};
add(panel);
int delay = 10; // milliseconds
ActionListener taskPerformer = new ActionListener() {
public void actionPerformed(ActionEvent evt) {
if (msgX >= -150)
msgX--;
else
msgX = 200;
repaint();
}
};
Timer timer = new Timer(delay, taskPerformer);
timer.setRepeats(true);
timer.start();
}
}
Find a Sample code here
Yes it will flicker. You will have to solve this problem using the concept of DoubleBuffering. It means that the image to be drawn is already buffered before its drawn on screen. It will remove the flickering effect.
I have a dialog where additional controls cause the dialog to resize when they appear. One day I will probably find a way to animate that, but for now I'm content with it just resizing. Problem is, it flickers.
I reduced the problem to a test:
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JRootPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
/**
* Shows flickering when resizing a dialog.
*/
public class FlickerTest extends FakeJDialog
{
public FlickerTest()
{
super((Window) null, "Flicker Test");
JButton button = new JButton("Bigger!");
button.addActionListener(new ActionListener()
{
#Override
public void actionPerformed(ActionEvent event)
{
Window window = SwingUtilities.getWindowAncestor((Component) event.getSource());
window.setSize(window.getWidth(), window.getHeight() + 20);
}
});
JPanel contentPane = new JPanel(new BorderLayout());
contentPane.setOpaque(true);
contentPane.add(button, BorderLayout.PAGE_START);
JRootPane rootPane = new JRootPane();
rootPane.setContentPane(contentPane);
add(rootPane);
setResizable(false);
pack();
setLocationRelativeTo(null);
}
public static void main(String[] args) throws Exception
{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
SwingUtilities.invokeLater(new Runnable()
{
#Override
public void run()
{
new FlickerTest().setVisible(true);
}
});
}
}
Each time I click the button, the window changes size. For a noticeable amount of time, the bottom of the dialog goes black. By recording my screen, I was able to get a screenshot demonstrating it:
How can I avoid this?
Further investigation:
The following subclass of Dialog exhibits the same flickering as JDialog:
import java.awt.Component;
import java.awt.Container;
import java.awt.Dialog;
import java.awt.Window;
import javax.swing.JLayeredPane;
import javax.swing.JRootPane;
import javax.swing.RootPaneContainer;
/**
* Minimal subclass of Dialog required to cause the flickering.
* If you comment out "implements RootPaneContainer", the flickering goes away.
*/
public class FakeJDialog extends Dialog implements RootPaneContainer
{
public FakeJDialog(Window owner, String title)
{
super(owner, title, Dialog.ModalityType.MODELESS);
}
public JRootPane getRootPane()
{
throw new UnsupportedOperationException();
}
public Container getContentPane()
{
throw new UnsupportedOperationException();
}
public void setContentPane(Container contentPane)
{
throw new UnsupportedOperationException();
}
public JLayeredPane getLayeredPane()
{
throw new UnsupportedOperationException();
}
public void setLayeredPane(JLayeredPane layeredPane)
{
throw new UnsupportedOperationException();
}
public Component getGlassPane()
{
throw new UnsupportedOperationException();
}
public void setGlassPane(Component glassPane)
{
throw new UnsupportedOperationException();
}
}
I find this kind of interesting, because merely commenting out the implements RootPaneContainer is somehow enough to completely change the behaviour. Something in Swing or AWT is obviously looking for this interface and treating those components specially. So this suggests that no subclass of JDialog would avoid the issue.
I don't believe there is a way around this with JDialog. However, java.awt.Dialog doesn't have this issue.
Try this, i have made an example which removes flickering almost completely
in addition u will get well-marked resize corner
/*
* resizing swing trick in Win7+Aero demo
* #author: s1w_
*/
import java.awt.event.*;
import java.awt.*;
import javax.swing.event.*;
import javax.swing.*;
class ResizeHookDemo extends JDialog {
private final static int width = 580, height = 350;
private final JFileChooser fc;
private java.awt.geom.GeneralPath gp;
public ResizeHookDemo() {
super((JDialog)null, "Choose File", true);
fc = new JFileChooser() {
#Override
public void paint(Graphics g) {
super.paint(g);
int w = getWidth();
int h = getHeight();
g.setColor(new Color(150, 150, 150, 200));
g.drawLine(w-7, h, w, h-7);
g.drawLine(w-11, h, w, h-11);
g.drawLine(w-15, h, w, h-15);
gp = new java.awt.geom.GeneralPath();
gp.moveTo(w-17, h);
gp.lineTo(w, h-17);
gp.lineTo(w, h);
gp.closePath();
}
};
fc.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
if (e.getActionCommand().equals("CancelSelection")) {
setVisible(false);
// action...
}
else if (e.getActionCommand().equals("ApproveSelection")) {
setVisible(false);
// action...
}
}
});
MouseInputListener resizeHook = new MouseInputAdapter() {
private Point startPos = null;
public void mousePressed(MouseEvent e) {
if (gp.contains(e.getPoint()))
startPos = new Point(getWidth()-e.getX(), getHeight()-e.getY());
}
public void mouseReleased(MouseEvent mouseEvent) {
startPos = null;
}
public void mouseMoved(MouseEvent e) {
if (gp.contains(e.getPoint()))
setCursor(Cursor.getPredefinedCursor(Cursor.SE_RESIZE_CURSOR));
else
setCursor(Cursor.getDefaultCursor());
}
public void mouseDragged(MouseEvent e) {
if (startPos != null) {
int dx = e.getX() + startPos.x;
int dy = e.getY() + startPos.y;
setSize(dx, dy);
repaint();
}
}
};
fc.addMouseMotionListener(resizeHook);
fc.addMouseListener(resizeHook);
fc.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 20));
add(fc);
setResizable(false);
setMinimumSize(new Dimension(width, height));
setDefaultCloseOperation(HIDE_ON_CLOSE);
setLocationRelativeTo(null);
}
public static void main(String args[]) {
System.out.println("Starting demo...");
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new ResizeHookDemo().setVisible(true);
}
});
}
}
does anyone know how to change the colors for JProgressBar when you use Nimbus LookAndFeel?
I have overridden the whole nimbusOrange-Default Value, which change all ProgressBar-Colors and any other nimbusOrange. (InternalFrame - minimize Button)
here with nimbusBase (blue)
UIDefaults defaults = UIManager.getLookAndFeelDefaults();
defaults.put("nimbusOrange",defaults.get("nimbusBase"));
Better is to write a own Painter and set this to the UIManager via
UIManager.put("ProgressBar[Enabled].backgroundPainter", myPainter);
If You want to change the Color for only a single ProgressBar instance, you can use Per-component customization
progress = new JProgressBar();
UIDefaults defaults = new UIDefaults();
defaults.put("ProgressBar[Enabled].backgroundPainter", new MyPainter());
progress.putClientProperty("Nimbus.Overrides.InheritDefaults", Boolean.TRUE);
progress.putClientProperty("Nimbus.Overrides", defaults);
an example of MyPainter can be as following:
class MyPainter implements Painter<JProgressBar> {
private final Color color;
public MyPainter(Color c1) {
this.color = c1;
}
#Override
public void paint(Graphics2D gd, JProgressBar t, int width, int height) {
gd.setColor(color);
gd.fillRect(0, 0, width, height);
}
}
but my compiler or IDE (eclipse) says that it doesn't know the Painter.
is there anybody to help me!
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
public class JProgressBarDemo extends JFrame {
protected int minValue = 0;
protected int maxValue = 100;
protected int counter = 0;
protected JProgressBar progressBar;
public JProgressBarDemo() {
super("JProgressBar Demo");
setSize(300, 100);
UIManager.put("ProgressBar.background", Color.BLACK); //colour of the background
UIManager.put("ProgressBar.foreground", Color.RED); //colour of progress bar
UIManager.put("ProgressBar.selectionBackground",Color.YELLOW); //colour of percentage counter on black background
UIManager.put("ProgressBar.selectionForeground",Color.BLUE); //colour of precentage counter on red background
progressBar = new JProgressBar();
progressBar.setMinimum(minValue);
progressBar.setMaximum(maxValue);
progressBar.setStringPainted(true);
JButton start = new JButton("Start");
start.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Thread runner = new Thread() {
public void run() {
counter = minValue;
while (counter <= maxValue) {
Runnable runme = new Runnable() {
public void run() {
progressBar.setValue(counter);
}
};
SwingUtilities.invokeLater(runme);
counter++;
try {
Thread.sleep(100);
} catch (Exception ex) {
}
}
}
};
runner.start();
}
});
getContentPane().add(progressBar, BorderLayout.CENTER);
getContentPane().add(start, BorderLayout.WEST);
WindowListener wndCloser = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
};
addWindowListener(wndCloser);
setVisible(true);
}
public static void main(String[] args) {
new JProgressBarDemo();
}
}