我试图复制这个组件（在帖子的底部），但我似乎无法让它看起来不错。
所以我想知道，我如何复制这种渐变色？或者如果不是渐变色，我该怎么做才能得到类似的结果？
与这个组件相比，我的尝试变成了非常平坦的黑色。它还具有 JFrame 选项（关闭、最小化等），并且对组件没有“圆形”外观。我正在寻找可以改善我所拥有的并解释我哪里出错的人。我知道我可以简单地使用已经制作的外观和感觉，但我想让我的示例项目尽可能接近图像中的 BitDefender GUI，不包括文本。（如果需要我可以提供代码）
另请注意，我跳过了背景和“病毒防护”、“自动扫描”、“我的 BitDefender”面板之间的面板。我这样做主要是因为我想让我的 SSCCE 尽可能小。
另外我想指出，将插图设置为gbc.insets = new Insets(2,10,2,10);3TopPanels使其看起来更接近 BitDefender GUI 的间距。（我只是暂时没有时间上传图片。所以我保留了代码，但我确实意识到它可以更新到上面的插图。
编辑 - 更新了更多来源
这是我的代码/SSCCE（它是 3 个单独的类，但我将它们合并为一个 .java）
package testgui;
import java.awt.*;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
public class TestGui {
public TestGui() {
JFrame frame = new JFrame();
MidPanel midPanel = new MidPanel();
TopPanel topPanel1 = new TopPanel();
TopPanel topPanel2 = new TopPanel();
TopPanel topPanel3 = new TopPanel();
JLabel appName = new JLabel("MyApplication");
JLabel verNum = new JLabel("version 1.0");
Font verFont = new Font("Tahoma", Font.BOLD, 11);
Font nameFont = new Font("Tahoma", Font.BOLD, 14);
GridBagConstraints gbc = new GridBagConstraints();
appName.setForeground(Color.WHITE);
appName.setFont(nameFont);
verNum.setForeground(Color.WHITE);
verNum.setFont(verFont);
//add program name and version number
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.WEST;
gbc.insets = new Insets(5, 5, 5, 5);
midPanel.add(appName, gbc);
gbc.gridx = 0;
gbc.gridy = 1;
gbc.anchor = GridBagConstraints.WEST;
gbc.insets = new Insets(5, 5, 5, 5);
midPanel.add(verNum, gbc);
//add 3 example top panels to midpanel
gbc.gridx = 0;
gbc.gridy = 2;
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.insets = new Insets(1,2,1,2);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.weightx = 1.0;
midPanel.add(topPanel1, gbc);
gbc.gridx = 0;
gbc.gridy = 3;
gbc.insets = new Insets(1,2,1,2);
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.weightx = 1.0;
midPanel.add(topPanel2, gbc);
gbc.gridx = 0;
gbc.gridy = 4;
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.insets = new Insets(1,2,1,2);
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.weightx = 1.0;
midPanel.add(topPanel3, gbc);
//add panel to push other panels to top
gbc.gridx = 0;
gbc.gridy = 5;
gbc.fill = GridBagConstraints.VERTICAL;
gbc.weighty = 1.0;
JPanel invisPanel = new JPanel();
invisPanel.setOpaque(false);
midPanel.add(invisPanel, gbc);
frame.getContentPane().add(midPanel);
frame.pack();
frame.setVisible(true);
}
//test it out
public static void main(String[] args) {
new TestGui();
}
//class for the top 3 panels
private class TopPanel extends JPanel {
private int maxLength;
private boolean cyclic;
public TopPanel() {
initComponents();
setOpaque(false);
cyclic = true;
maxLength = 0;
}
@Override
public void paintComponent(Graphics g) {
if(isOpaque()) {
super.paintComponent(g);
return;
}
int width = getWidth();
int height = getHeight();
GradientPaint paint = null;
Color top = new Color(50, 50, 50);
Color btm = new Color(19, 19, 19);
paint = new GradientPaint(width / 2, 0, top, width / 2, maxLength > 0 ? maxLength : height, btm, cyclic);
if(paint == null) {
throw new RuntimeException("Invalid direction specified in GamerTagPanel");
}
Graphics2D g2d = (Graphics2D) g;
Paint oldPaint = g2d.getPaint();
g2d.setPaint(paint);
g2d.fillRect(0, 0, width, height);
g2d.setPaint(oldPaint);
super.paintComponent(g);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(300, 200);
}
private void initComponents() {
GridBagConstraints gbc;
JLabel jLabel1 = new JLabel();
JLabel jLabel2 = new JLabel();
setBorder(BorderFactory.createLineBorder(new Color(204,204,204)));
setLayout(new GridBagLayout());
jLabel1.setFont(new Font("Tahoma", Font.BOLD, 11));
jLabel1.setForeground(new Color(255, 255, 255));
jLabel1.setText("Scanning...");
gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 0;
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.insets = new Insets(5, 5, 5, 5);
add(jLabel1, gbc);
jLabel2.setFont(new java.awt.Font("Tahoma", Font.BOLD, 11));
jLabel2.setForeground(new java.awt.Color(255, 255, 255));
jLabel2.setText("C:\\Directory\\Folder\\SubFolder\\SpecificFolder\\File.file");
gbc = new GridBagConstraints();
gbc.gridx = 0;
gbc.gridy = 1;
gbc.gridwidth = 2;
gbc.fill = GridBagConstraints.HORIZONTAL;
gbc.anchor = GridBagConstraints.NORTHWEST;
gbc.weightx = 1.0;
gbc.insets = new Insets(5, 5, 5, 5);
add(jLabel2, gbc);
}
}
public class MidPanel extends JPanel {
private int maxLength;
private boolean cyclic;
public MidPanel() {
setLayout(new GridBagLayout());
setOpaque(false);
maxLength = 0;
cyclic = false;
}
@Override
public void paintComponent(Graphics g) {
if(isOpaque()) {
super.paintComponent(g);
return;
}
int width = getWidth();
int height = getHeight();
GradientPaint paint = null;
Color top = new Color(75, 75, 75);
Color btm = new Color(19, 19, 19);
paint = new GradientPaint(width / 2, 0, top, width / 2, maxLength > 0 ? maxLength : height, btm, cyclic);
if(paint == null) {
throw new RuntimeException("Invalid direction specified in GamerTagPanel");
}
Graphics2D g2d = (Graphics2D) g;
Paint oldPaint = g2d.getPaint();
g2d.setPaint(paint);
g2d.fillRect(0, 0, width, height);
g2d.setPaint(oldPaint);
super.paintComponent(g);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(300, 400);
}
}
}
感谢 JoopEggen 指出我在 GradientPaint 上的颜色问题。它帮了大忙。我仍在寻找某人来组合一个更好/更接近的例子。这是我第一次以这种方式覆盖paintComponent。
