自定义border （Oval Border）

目录：

•   Oval border

•   效果图
  

java代码：

import java.awt.Color;import java.awt.Component;import java.awt.Graphics;import java.awt.GridLayout;import java.awt.Insets;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.border.Border;public class OvalBorder implements Border {  protected int ovalWidth = 6;  protected int ovalHeight = 6;  protected Color lightColor = Color.white;  protected Color darkColor = Color.gray;  public OvalBorder() {    ovalWidth = 6;    ovalHeight = 6;  }  public OvalBorder(int w, int h) {    ovalWidth = w;    ovalHeight = h;  }  public OvalBorder(int w, int h, Color topColor, Color bottomColor) {    ovalWidth = w;    ovalHeight = h;    lightColor = topColor;    darkColor = bottomColor;  }  public Insets getBorderInsets(Component c) {    return new Insets(ovalHeight, ovalWidth, ovalHeight, ovalWidth);  }  public boolean isBorderOpaque() {    return true;  }  public void paintBorder(Component c, Graphics g, int x, int y, int width,      int height) {    width--;    height--;    g.setColor(lightColor);    g.drawLine(x, y + height - ovalHeight, x, y + ovalHeight);    g.drawArc(x, y, 2 * ovalWidth, 2 * ovalHeight, 180, -90);    g.drawLine(x + ovalWidth, y, x + width - ovalWidth, y);    g.drawArc(x + width - 2 * ovalWidth, y, 2 * ovalWidth, 2 * ovalHeight,        90, -90);    g.setColor(darkColor);    g.drawLine(x + width, y + ovalHeight, x + width, y + height        - ovalHeight);    g.drawArc(x + width - 2 * ovalWidth, y + height - 2 * ovalHeight,        2 * ovalWidth, 2 * ovalHeight, 0, -90);    g        .drawLine(x + ovalWidth, y + height, x + width - ovalWidth, y            + height);    g.drawArc(x, y + height - 2 * ovalHeight, 2 * ovalWidth,        2 * ovalHeight, -90, -90);  }  public static void main(String[] s) {    JFrame f = new JFrame("Oval Border");    f.setSize(100, 100);    JPanel p = new JPanel(new GridLayout(0, 1, 5, 5));    JLabel l = new JLabel("Oval Border");    l.setBorder(new OvalBorder());    p.add(l);    p.setBorder(new OvalBorder());    f.getContentPane().add(p);    f.show();  }}

效果图：

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