我可以像如何在Java Swing中创建带圆角标题边框中所示，给我的JDialog添加一个圆角边框。但它还是只有一种颜色。我想让边框看起来像3D。
以下是我尝试的方法。
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);
那么，没有3D效果，但是边框的宽度已经增大，并且使用了新的边框颜色。
我该如何实现这个效果?
如果有示例代码或链接将不胜感激。
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);
}
});
}
}
它还远非完美，但基本思路可行...
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);
}
}
}