如何为具有圆角的JDialog设置3D边框？

我可以在我的JDialog中添加圆角边框，如在Java Swing中如何创建圆角标题边框 。 但它仍然是一种颜色。 我想让边框看起来像3D。

这是我尝试的方式。

Graphics2D g2d = (Graphics2D) g; Color c1 = getBackground(); Color c2 = color1.darker(); int w = getWidth(); int h = getHeight(); GradientPaint gp = new GradientPaint( 0, 0, c1, 0, h, c2); g2d.setPaint(gp); g2d.fill3DRect(0,0, w, h,true); 

然后，没有3D外观，但边框已经扩大了边框颜色。
我怎样才能做到这一点？

任何示例代码或链接将受到高度赞赏。

Answer 1

这还够吗？

它远非完美，但基本理念有效……

 public class MyRoundedBorder implements Border { protected static final Insets DEFAULT_INSETS = new Insets(4, 4, 4, 4); @Override public void paintBorder(Component c, Graphics g, int x, int y, int width, int height) { Graphics2D g2d = (Graphics2D) g.create(); g2d.setStroke(new BasicStroke(3, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND)); g2d.setColor(Color.WHITE); Shape corner = new RoundedShape(width - 8, height - 8); g2d.translate(x + 2, y + 2); g2d.draw(corner); g2d.transform(AffineTransform.getRotateInstance(Math.toRadians(180), (width - 8) / 2, (height - 8) / 2)); g2d.setColor(Color.LIGHT_GRAY); g2d.draw(corner); g2d.dispose(); } @Override public Insets getBorderInsets(Component c) { return DEFAULT_INSETS; } @Override public boolean isBorderOpaque() { return true; } public class RoundedShape extends Path2D.Float { public RoundedShape(int width, int height) { moveTo(0, height - 20); append(new Arc2D.Float(0, height - 20, 20, 20, 180, 45, Arc2D.CHORD), false); lineTo(0, 20); curveTo(0, 0, 0, 0, 20, 0); lineTo(width - 10, 0); append(new Arc2D.Float(width - 20, 0, 20, 20, 90, -45, Arc2D.CHORD), false); } } } 

Answer 2

 import java.awt.*; import java.awt.geom.*; import javax.swing.*; import javax.swing.border.*; public class ThreeDimensionalBorder extends AbstractBorder { private static final long serialVersionUID = 1L; private Color color; private int thickness = 8; private int radii = 8; private Insets insets = null; private BasicStroke stroke = null; private int strokePad; RenderingHints hints; int shadowPad = 3; ThreeDimensionalBorder(Color color) { this(color, 128, 8); } ThreeDimensionalBorder(Color color, int transparency, int shadowWidth) { this.color = color; shadowPad = shadowWidth; stroke = new BasicStroke(thickness); strokePad = thickness/2; hints = new RenderingHints( RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); int pad = radii + strokePad; int bottomPad = pad + strokePad + shadowPad; int rightPad = pad + strokePad + shadowPad; insets = new Insets(pad,pad,bottomPad+shadowPad,rightPad); } @Override public Insets getBorderInsets(Component c) { return insets; } @Override public Insets getBorderInsets(Component c, Insets insets) { return getBorderInsets(c); } @Override public void paintBorder( Component c, Graphics g, int x, int y, int width, int height) { Graphics2D g2 = (Graphics2D)g; int bottomLineY = height-thickness-shadowPad; RoundRectangle2D.Double bubble = new RoundRectangle2D.Double( 0+strokePad, 0+strokePad, width-thickness-shadowPad, bottomLineY, radii, radii ); Area area = new Area(bubble); g2.setRenderingHints(hints); g2.setColor(color); g2.setStroke(stroke); g2.draw(area); Area shadowArea = new Area(new Rectangle(0,0,width,height)); shadowArea.subtract(area); g.setClip(shadowArea); Color shadow = new Color(color.getRed(),color.getGreen(),color.getBlue(),128); g2.setColor(shadow); g2.translate(shadowPad,shadowPad); g2.draw(area); AffineTransform at = g2.getTransform(); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { JPanel p = new JPanel(); String t = "The quick brown fox jumps over the lazy dog!"; JLabel l1 = new JLabel(t); l1.setBorder(new ThreeDimensionalBorder(Color.MAGENTA.darker(),128,4)); p.add(l1); JLabel l2 = new JLabel(t); l2.setBorder(new ThreeDimensionalBorder(Color.BLACK,200,5)); p.add(l2); JLabel l3 = new JLabel(t); l3.setBorder(new ThreeDimensionalBorder(Color.BLUE,40,6)); p.add(l3); JOptionPane.showMessageDialog(null, p); } }); } }