Creating a JLabel with a Gradient - java

I'm new to Java and I'm trying to create a heading using a JLabel and for its fill to be a gradient. I cannot get it to work and I've been trying for a while. I've been grabbing bits of come from here and other websites and cannot seem to make this work, nor make sense of other peoples more complex code that does work. Here are my two classes so far:
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EtchedBorder;
public class Test {
public static void main(String[] args) {
new Test().setupGUI();
}
public void setupGUI() {
//set up frames and buttons etc.
JFrame theFrame = new JFrame ("Crystal Ball");
theFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel background = new JPanel();
background.setBackground(Color.BLUE);
background.setLayout(new BoxLayout(background, BoxLayout.PAGE_AXIS));
theFrame.setSize(500,1000);
DLabel heading = new DLabel("Guess a Number");
heading.setText("GUESS A NUMBER");
heading.setPreferredSize(new Dimension(theFrame.getWidth(),100));
heading.setFont(new Font("Serif", Font.PLAIN, 40));
heading.setAlignmentX(Component.CENTER_ALIGNMENT);
//heading.setBackground(Color.YELLOW);
heading.setBorder(BorderFactory.createEtchedBorder(EtchedBorder.RAISED));
background.add(heading);
theFrame.getContentPane().add(background);
theFrame.pack();
theFrame.setVisible(true);
//startGame();
}
}
import java.awt.Color;
import java.awt.Dimension;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import javax.swing.BorderFactory;
import javax.swing.JLabel;
public class DLabel extends JLabel
{
Dimension size = new Dimension(70, 80);
public DLabel(String name)
{
this.setPreferredSize(size);
this.setText(name);
this.setBorder(BorderFactory.createBevelBorder(TOP, Color.white, Color.black));
this.setOpaque(true);
}
public void paintComponent(Graphics g) {
// super.paintComponent(g); // *** commented
Graphics2D g2d = (Graphics2D) g;
Color color1 = Color.YELLOW;
Color color2 = color1.brighter();
int w = getWidth();
int h = getHeight();
GradientPaint gp = new GradientPaint(0, 0, color1, 0, h, color2);
g2d.setPaint(gp);
g2d.fillRect(0, 0, w, h);
super.paintComponent(g); // *** added
}
}

There is one little "trick" you can actually do, by leaving the label transparent, you can actually paint under the text by painting BEFORE you call super.paintComponent, for example...
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.LinearGradientPaint;
import java.awt.Point;
import java.awt.Rectangle;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TestLabel101 {
public static void main(String[] args) {
new TestLabel101();
}
public TestLabel101() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JLabel {
public TestPane() {
setText("Happy, Happy");
setForeground(Color.WHITE);
setHorizontalAlignment(CENTER);
}
#Override
protected void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g.create();
LinearGradientPaint lgp = new LinearGradientPaint(
new Point(0, 0),
new Point(0, getHeight()),
new float[]{0.142f, 0.284f, 0.426f, 0.568f, 0.71f, 0.852f, 1f},
new Color[]{Color.PINK, Color.MAGENTA, Color.BLUE, Color.GREEN, Color.YELLOW, Color.ORANGE, Color.RED});
g2d.setPaint(lgp);
g2d.fill(new Rectangle(0, 0, getWidth(), getHeight()));
g2d.dispose();
super.paintComponent(g);
}
}
}
nb: I should point out that this process is inefficient, as the RepaintManager will still want to paint under the component
There is another trick, but my two year old daughter wants to check to see if Santa is here ;)
Updated
The other trick involves understanding how the paint process actually works. When you call super.paintComponent, it calls the update method on the ComponentUI (look and feel delegate), this is actually the method that fills the background if the component is opaque, this method then calls the look and feels delegate's paint method, which actually does the base painting...
We can circumvent the process slightly and instead of calling super.paintComponent, we can call the look and feels delegate's paint method directly...
public class TestPane extends JLabel {
public TestPane() {
setText("Happy, Happy");
setForeground(Color.WHITE);
setHorizontalAlignment(CENTER);
setOpaque(true);
}
#Override
protected void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g.create();
LinearGradientPaint lgp = new LinearGradientPaint(
new Point(0, 0),
new Point(0, getHeight()),
new float[]{0.142f, 0.284f, 0.426f, 0.568f, 0.71f, 0.852f, 1f},
new Color[]{Color.PINK, Color.MAGENTA, Color.BLUE, Color.GREEN, Color.YELLOW, Color.ORANGE, Color.RED});
g2d.setPaint(lgp);
g2d.fill(new Rectangle(0, 0, getWidth(), getHeight()));
g2d.dispose();
getUI().paint(g, this);
}
}
This is more efficient then the previous example, as it doesn't require the RepaintManager to paint the area underneath this component, but it might not work with all look and feels

The problem is that you made the JLabel opaque, which means it will paint the background. So the call to super.paintComponent(...) over paints the gradient background. So get rid of:
//this.setOpaque(true);
Another problem with the code is that color1.brighter() doesn't work. Try something like:
Color color2 = Color.RED;
Also, You should not change the Graphics object, since that object is also used to paint other Swing components. Instead you should use g.create() to get a copy of the Graphics object. Make your changes to that object, do the painting and then dispose() the object.
So the (untested) code would be something like:
Graphics2D g2d = (Graphics2D)g.create();
...
g2d.fillRect(...);
g2d.dispose();
super.paintCompoenent(g);

You should set your gradientPaint object to your Graphics and then pass that into super.paintComponent
try this:
public void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
Color color1 = Color.YELLOW;
Color color2 = color1.brighter();
int w = getWidth();
int h = getHeight();
GradientPaint gp = new GradientPaint(0, 0, color1, 0, h, color2);
g2d.setPaint(gp);
super.paintComponent(g2d);
}

Related

How do you create a gradient for JPanel? Also, how do you call a class within a class in Java?

I am making a Java GUI and I have searched the internet for 2 hours on how make a gradient for a JPanel. The code below is that I have, but when run the gradient does not show. What is wrong?
I've tried many other posts from similar questions on this throughout the Internet but they don't work. I've tried numerous versions, but I also don't exactly know how to run a class within a class. Can someone help me please?
class TestPanel extends JPanel{
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
int w = getWidth();
int h = getHeight();
Color color1 = Color.BLUE;
Color color2 = Color.GREEN;
GradientPaint gp = new GradientPaint(0, 0, color1, 0, h, color2);
g2d.setPaint(gp);
g2d.fillRect(0, 0, w, h);
}
} //this is nested within the main class
//some code
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
CreateGUI cg = new CreateGUI();
cg.create(); //previous method (not mentioned here)
CreateGUI.TestPanel tp = cg.new TestPanel(); //problem
JPanel panel = new JPanel();
f.add(panel);
f.setSize(800, 600);
f.setLocationRelativeTo(null);
f.getContentPane().setLayout(null);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.setVisible(true);
}
});
}
I expect there to be a gradient but there is none; the background of the JPanel is still white
The instance of TestPanel is never added to anything
null layouts will prevent the component from been sized and positioned, so you won't see anything even if your did the previous step
You should, unless you're adding child components to it, provide a sizing hint, so that the layout managers have something to work with.
For example:
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame();
frame.add(new TestPanel());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
class TestPanel extends JPanel {
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g.create();
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
int w = getWidth();
int h = getHeight();
Color color1 = Color.BLUE;
Color color2 = Color.GREEN;
GradientPaint gp = new GradientPaint(0, 0, color1, 0, h, color2);
g2d.setPaint(gp);
g2d.fillRect(0, 0, w, h);
g2d.dispose();
}
}
}

JButton border set with setBackground()?

So I have some code to change the background color of a button, but when I use the code, it sets the background color and border color.
Is there a way to not make this happen?
Thanks!
Code:
public void highlight(ArrayList<JButton> buttons){
for (JButton j : buttons) {
j.setBorder(new JButton().getBorder());
j.setBackground(Color.GREEN);
j.setForeground(Color.WHITE);
j.setOpaque(true);
j.setBorderPainted(false);
j.setFocusPainted(false);
j.setBorderPainted(false);
}
}
Okay, so this is a hacked version and is based on the idea that you want to maintain the current "look and feel" of the button, but want to use a different fill color
This simply applies a "highlight" color over the button...
import java.awt.AlphaComposite;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsEnvironment;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.RenderingHints;
import java.awt.Transparency;
import java.awt.image.BufferedImage;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import org.kaizen.core.ui.ImageUtilities;
public class Main {
public static void main(String[] args) {
new Main();
}
public Main() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
setLayout(new GridBagLayout());
HighlightButton btn = new HighlightButton("Help");
btn.setMargin(new Insets(20, 20, 20, 20));
btn.setHighlight(new Color(255, 0, 0, 64));
add(btn);
btn = new HighlightButton("Help");
btn.setMargin(new Insets(20, 20, 20, 20));
btn.setHighlight(new Color(0, 255, 0, 64));
add(btn);
btn = new HighlightButton("Help");
btn.setMargin(new Insets(20, 20, 20, 20));
btn.setHighlight(new Color(0, 0, 255, 64));
add(btn);
btn = new HighlightButton("Help");
btn.setMargin(new Insets(20, 20, 20, 20));
add(btn);
}
}
public class HighlightButton extends JButton {
private Color highlight;
public HighlightButton() {
setOpaque(false);
}
public HighlightButton(String text) {
super(text);
setOpaque(false);
}
public void setHighlight(Color color) {
if (color != highlight) {
Color old = highlight;
this.highlight = color;
firePropertyChange("highlight", old, highlight);
repaint();
}
}
public Color getHighlight() {
return highlight;
}
#Override
protected void paintComponent(Graphics g) {
Color highlight = getHighlight();
if (highlight != null) {
BufferedImage img = createCompatibleImage(getWidth(), getHeight(), Transparency.TRANSLUCENT);
Graphics2D g2d = img.createGraphics();
super.paintComponent(g2d);
g2d.dispose();
BufferedImage mask = generateMask(img, getHighlight(), 1f);
g.drawImage(img, 0, 0, this);
g.drawImage(mask, 0, 0, this);
} else {
super.paintComponent(g);
}
}
}
public static BufferedImage createCompatibleImage(int width, int height, int transparency) {
BufferedImage image = getGraphicsConfiguration().createCompatibleImage(width, height, transparency);
image.coerceData(true);
return image;
}
public static GraphicsConfiguration getGraphicsConfiguration() {
return GraphicsEnvironment.getLocalGraphicsEnvironment().getDefaultScreenDevice().getDefaultConfiguration();
}
public static BufferedImage generateMask(BufferedImage imgSource, Color color, float alpha) {
int imgWidth = imgSource.getWidth();
int imgHeight = imgSource.getHeight();
BufferedImage imgMask = createCompatibleImage(imgWidth, imgHeight, Transparency.TRANSLUCENT);
Graphics2D g2 = imgMask.createGraphics();
applyQualityRenderingHints(g2);
g2.drawImage(imgSource, 0, 0, null);
g2.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_IN, alpha));
g2.setColor(color);
g2.fillRect(0, 0, imgSource.getWidth(), imgSource.getHeight());
g2.dispose();
return imgMask;
}
public static void applyQualityRenderingHints(Graphics2D g2d) {
g2d.setRenderingHint(RenderingHints.KEY_ALPHA_INTERPOLATION, RenderingHints.VALUE_ALPHA_INTERPOLATION_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setRenderingHint(RenderingHints.KEY_COLOR_RENDERING, RenderingHints.VALUE_COLOR_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_DITHERING, RenderingHints.VALUE_DITHER_ENABLE);
g2d.setRenderingHint(RenderingHints.KEY_FRACTIONALMETRICS, RenderingHints.VALUE_FRACTIONALMETRICS_ON);
g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BILINEAR);
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
g2d.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
}
}
Basically, what this does, is paints a "masked" image, colored in the highlighted color OVER the top of the button. This is important to remember. The higher the alpha value of the color becomes, the less likely you are to see the text.
I've not tested this on windows, so I can't guarantee the results.
The content filling is performed by the look and feel delegate and generally ignores the color properties of the class (yeah, I know, awesome), so if you want to try and do something which was a little more robust, you'd need to define your own look and feel delegate and take over the painting process, no simple task.
Of course, you could just dispense with the content filling and borders used by the look and feel delegate and paint your own (overriding the paintComponent method), but this will not take advantage of the look and feel settings, so that's a balancing act you need to decide on

Move a rectangle which has gradient fill

When I use the coordinates of (0,0) "Rectangle(0,0,100,100)" for the rectangle I get gradient. When I use:
GradientPaint gp = new GradientPaint(0, 0, c1, 0, 100, c2);
Rectangle reckt = new Rectangle(0,100,100,200);
the gradient disappears. What am I doing wrong?
public void draw( Graphics g ) {
Graphics2D g2d = (Graphics2D) g;
c1 = new Color(0, 0, 255);
c2 = new Color(0, 255, 255);
GradientPaint gp = new GradientPaint(0, 0, c1, 0, 100, c2);
g2d.setPaint(gp);
Rectangle reckt = new Rectangle(0,0,100,100);
g2d.fill(reckt);
}
The first two parameters define the x/y point at which the gradient starts and the fourth and fifth define the height and width. So basically, you're drawing your rectangle beyond the the gradient fill
You have two options, either change the x/y position if the GradientFill or use a AffineTransform and translate the Graphics context to where you want to paint and simply always paint at 0x0 for both
A AffineTransform allows you to translate (among other things) the Graphics top/left position, for example...
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.geom.AffineTransform;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class TestTranslate {
public static void main(String[] args) {
new TestTranslate();
}
public TestTranslate() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class TestPane extends JPanel {
public TestPane() {
}
#Override
public Dimension getPreferredSize() {
return new Dimension(200, 200);
}
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Color c1 = new Color(0, 0, 255);
Color c2 = new Color(0, 255, 255);
GradientPaint gp = new GradientPaint(0, 0, c1, 0, 100, c2);
for (int offset = 0; offset < getWidth(); offset += 50) {
Graphics2D g2d = (Graphics2D) g.create();
g2d.setPaint(gp);
g2d.setTransform(AffineTransform.getTranslateInstance(offset, offset));
g2d.fill(new Rectangle(0, 0, 100, 100));
g2d.dispose();
}
}
}
}

How to add gradient color to Jbuttons placed in jtoolbar

I am using netbeans platform module to develop this desktop application. I am using drag and drop facility in netbeans in the developement.
I needed to create a toolbar which is having few buttons..I need to create a gradient color for these buttons.
I dragged and dropped JToolBar, over it I dragged and placed JButton objects.
In the properties of the button I have selected a color for which I want a shaded color. In the custom code I have modified.
jbutton = new javax.swing.Jbutton();
as below
jbutton = new javax.swing.JButton(){
#Override
protected void paintComponent(Graphics grphcs) {
Graphics2D g2d = (Graphics2D) grphcs;
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
GradientPaint gp = new GradientPaint(0, 0,
getBackground().brighter().brighter().brighter(), 0, getHeight(),
getBackground().darker());
g2d.setPaint(gp);
g2d.fillRect(0, 0, getWidth(), getHeight());
super.paintComponent(grphcs);
}};
When I used the above code for a JPanel in my project it worked but it is not showing any effect when I used it for a button.
How to get a gradient color for a button placed in a toolbar?
The button has a contentAreaFilled attribute which determines if the look and feel should paint the content area of the button. When you call super.paintComponent, the look and feel delegate will paint over what you have done.
You can set this property to false and it should then work.
For example...
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridBagLayout;
import java.awt.RenderingHints;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class GradientButtons {
public static void main(String[] args) {
new GradientButtons();
}
public GradientButtons() {
EventQueue.invokeLater(new Runnable() {
#Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new GridBagLayout());
frame.add(new RoundButton("Click me"));
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public class RoundButton extends JButton {
public RoundButton(String text) {
super(text);
setBorderPainted(false);
setContentAreaFilled(false);
setFocusPainted(false);
setOpaque(false);
}
#Override
public Dimension getPreferredSize() {
Dimension size = super.getPreferredSize();
int radius = Math.max(size.width, size.height);
size.width = radius;
size.height = radius;
return size;
}
#Override
protected void paintComponent(Graphics g) {
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
GradientPaint gp = new GradientPaint(0, 0,
Color.RED, 0, getHeight(),
Color.YELLOW);
g2d.setPaint(gp);
g2d.fillOval(0, 0, getWidth(), getHeight());
super.paintComponent(g);
}
}
}
You may want to check the ButtonModel's armed and/or pressed state so you can also change the way that the button is painted when clicked, as a suggestion...

JPanel gradient background

I googled but could find no correct answer. I have a JPanel and I want it to have a gradient that comes from top to bottom. I'm just going to use two colors. How can I achieve this?
Here you go:
import java.awt.Color;
import java.awt.GradientPaint;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.SwingUtilities;
public class TestPanel extends JPanel {
#Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_QUALITY);
int w = getWidth(), h = getHeight();
Color color1 = Color.RED;
Color color2 = Color.GREEN;
GradientPaint gp = new GradientPaint(0, 0, color1, w, h, color2);
g2d.setPaint(gp);
g2d.fillRect(0, 0, w, h);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
JFrame frame = new JFrame();
TestPanel panel = new TestPanel();
frame.add(panel);
frame.setSize(200, 200);
frame.setLocationRelativeTo(null);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setVisible(true);
}
});
}
}
You can use this :
JPanel contentPane = new JPanel() {
#Override
protected void paintComponent(Graphics grphcs) {
super.paintComponent(grphcs);
Graphics2D g2d = (Graphics2D) grphcs;
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
GradientPaint gp = new GradientPaint(0, 0,
getBackground().brighter().brighter(), 0, getHeight(),
getBackground().darker().darker());
g2d.setPaint(gp);
g2d.fillRect(0, 0, getWidth(), getHeight());
}
};
hope that help;
you can also back to this artical for more help:
Gradient background to any jcomponent

Categories