java中Swing中的自定义JButton
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package Swing;import java.awt.AlphaComposite; import java.awt.Color; import java.awt.Dimension; import java.awt.FlowLayout;import java.awt.Font; import java.awt.GradientPaint; import java.awt.Graphics; import java.awt.Graphics2D; import java.awt.Point; import java.awt.RenderingHints; import java.awt.Shape; import java.awt.event.MouseAdapter; import java.awt.event.MouseEvent; import java.awt.geom.Arc2D; import java.awt.geom.GeneralPath; import java.awt.geom.RoundRectangle2D; import javax.swing.JButton; import javax.swing.JFrame; /** * Custom JButton * * @version 0.1.0 * @author ruislan <a href="mailto:z17520@126.com" mce_href="mailto:z17520@126.com"></a> */ public class RButton extends JButton { private static final long serialVersionUID = 39082560987930759L; public static final Color BUTTON_COLOR1 = new Color(205, 255, 205); public static final Color BUTTON_COLOR2 = new Color(51, 154, 47); // public static final Color BUTTON_COLOR1 = new Color(125, 161, 237); // public static final Color BUTTON_COLOR2 = new Color(91, 118, 173); public static final Color BUTTON_FOREGROUND_COLOR = Color.WHITE; private boolean hover; private int style; public static final int ROUND_RECT = 0; // 分别定义的四种形状 public static final int LEFT_ROUND_RECT = 1; public static final int RIGHT_ROUND_RECT = 2; public static final int BALL = 3; public static final int STAR = 4; public RButton() { this(ROUND_RECT); } public RButton(int style) { this.style = style; setPreferredSize(new Dimension(60, 30)); //默认初始的大小为60、30 if (BALL == style) { setPreferredSize(new Dimension(42, 42)); //为球形时新大小 } else if (STAR == style) { setPreferredSize(new Dimension(42, 42)); //为星星时新大小 } setFont(new Font("system", Font.PLAIN, 12)); setBorderPainted(false); setForeground(BUTTON_COLOR2); setFocusPainted(false); setContentAreaFilled(false); addMouseListener(new MouseAdapter() { @Override public void mouseEntered(MouseEvent e) { //鼠标进入button setForeground(BUTTON_FOREGROUND_COLOR); hover = true; repaint(); } @Override public void mouseExited(MouseEvent e) { //鼠标离开button setForeground(BUTTON_COLOR2); hover = false; repaint(); } }); } @Override protected void paintComponent(Graphics g) { Graphics2D g2d = (Graphics2D) g.create(); int h = getHeight(); System.out.println(h); int w = getWidth(); System.out.println(w); float tran = 1F; if (!hover) { tran = 0.3F; } g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); GradientPaint p1; GradientPaint p2; if (getModel().isPressed()) { p1 = new GradientPaint(0, 0, new Color(0, 0, 0), 0, h - 1, new Color(100, 100, 100)); p2 = new GradientPaint(0, 1, new Color(0, 0, 0, 50), 0, h - 3, new Color(255, 255, 255, 100)); } else { p1 = new GradientPaint(0, 0, new Color(100, 100, 100), 0, h - 1, new Color(0, 0, 0)); p2 = new GradientPaint(0, 1, new Color(255, 255, 255, 100), 0, h - 3, new Color(0, 0, 0, 50)); } g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER, tran)); GradientPaint gp = new GradientPaint(0.0F, 0.0F, BUTTON_COLOR1, 0.0F, h, BUTTON_COLOR2, true); g2d.setPaint(gp); switch (style) { case ROUND_RECT: { RoundRectangle2D.Float r2d = new RoundRectangle2D.Float(0, 0, w - 1, h - 1, 20, 20); Shape clip = g2d.getClip(); g2d.clip(r2d); g2d.fillRect(0, 0, w, h); g2d.setClip(clip); g2d.setPaint(p1); g2d.drawRoundRect(0, 0, w - 1, h - 1, 20, 20); g2d.setPaint(p2); g2d.drawRoundRect(1, 1, w - 3, h - 3, 18, 18); break; } case LEFT_ROUND_RECT: { RoundRectangle2D.Float r2d = new RoundRectangle2D.Float(0, 0, (w - 1) + 20, h - 1, 20, 20); Shape clip = g2d.getClip(); g2d.clip(r2d); g2d.fillRect(0, 0, w, h); g2d.setClip(clip); g2d.setPaint(p1); g2d.drawRoundRect(0, 0, (w - 1) + 20, h - 1, 20, 20); g2d.setPaint(p2); g2d.drawRoundRect(1, 1, (w - 3) + 20, h - 3, 18, 18); g2d.setPaint(p1); g2d.drawLine(w - 1, 1, w - 1, h); g2d.setPaint(p2); g2d.drawLine(w - 2, 2, w - 2, h - 1); break; } case RIGHT_ROUND_RECT: { RoundRectangle2D.Float r2d = new RoundRectangle2D.Float(-20, 0, (w - 1) + 20, h - 1, 20, 20); Shape clip = g2d.getClip(); g2d.clip(r2d); g2d.fillRect(0, 0, w, h); g2d.setClip(clip); g2d.setPaint(p1); g2d.drawRoundRect(-20, 0, (w - 1) + 20, h - 1, 20, 20); g2d.setPaint(p2); g2d.drawRoundRect(-19, 1, (w - 3) + 20, h - 3, 18, 18); g2d.setPaint(p1); g2d.drawLine(0, 1, 0, h); g2d.setPaint(p2); g2d.drawLine(1, 2, 1, h - 1); break; } case BALL: { Arc2D.Float a2d = new Arc2D.Float(0, 0, w, h, 0, 360, Arc2D.CHORD); Shape clip = g2d.getClip(); g2d.clip(a2d); g2d.fillRect(0, 0, w, h); g2d.setClip(clip); g2d.setPaint(p1); g2d.drawOval(0, 0, w - 1, h - 1); g2d.setPaint(p2); g2d.drawOval(1, 1, w - 3, h - 3); break; } case STAR: { int x = w / 2; int y = h / 2; int r = w / 2; // 计算五个顶点 Point[] ps = new Point[5]; for (int i = 0; i <= 4; i++) { ps[i] = new Point((int) (x - r * Math.sin((i * 72 + 36) * 2 * Math.PI / 360)), (int) (y + r * Math.cos((i * 72 + 36) * 2 * Math.PI / 360))); } GeneralPath star = new GeneralPath(); star.moveTo(ps[3].x, ps[3].y); star.lineTo(ps[0].x, ps[0].y); star.lineTo(ps[2].x, ps[2].y); star.lineTo(ps[4].x, ps[4].y); star.lineTo(ps[1].x, ps[1].y); star.lineTo(ps[3].x, ps[3].y); star.closePath(); Shape clip = g2d.getClip(); g2d.clip(star); g2d.fillRect(0, 0, w, h); g2d.setClip(clip); g2d.setPaint(p1); g2d.draw(star); g2d.setPaint(p2); g2d.draw(star); break; } default: break; } g2d.dispose(); super.paintComponent(g); } public static void main(String[] args) { JButton button=new RButton(0);//产生一个圆形按钮 button.setText("开始"); button.setBackground(new Color(216,191,216));//设置背景色为绿色 //产生一个框架显示这个按钮 JFrame frame=new JFrame("图形按钮"); frame.getContentPane().setBackground(Color.orange); frame.getContentPane().setLayout(new FlowLayout()); frame.getContentPane().add(button); frame.setSize(200,250); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);}} 结果：
注意代码中的几个部分：
首先是paintComponent方法中最后一行，我们调用了父类的paintComponent方法，这是因为我们要靠父类来绘制字符，但是父类的这个方法除了绘制字符之外还会绘制其他的，所以我们需要关闭掉其他的（当然我们也可以自己来绘制字符，但是JButton提供了方法为什么不用呢），所以我们在构造方法那里调用了：
setBorderPainted(false);
setFocusPainted(false);
setContentAreaFilled(false);
告诉父类不用绘制边框，不用绘制焦点，不用绘制内容部分，这部分我们自己来搞*o*。
然后就是这一句了g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON)告诉绘制API我们需要平滑一点，否则绘制出来会有很多锯齿哟。
接下来的这一句g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,tran))告诉绘图API我们需要绘制一个有透明度的，tran就是透明度（0-1）。
然后就是将边框的边角变直角为圆角，我们绘制一个RoundRectangle2D，这个就是边角都为圆角的方形，然后我们根据这个方形来clip我们的方形，这样方形就被RoundRectangle2D的圆角方形包裹，从而变成了圆角方形。
最后就是绘制外边线和内边线，通过改变内边线和外边线的色变从而造成陷入或者突出效果。
整个JButton改造完毕，如果你能够活用clip的话，你也可以做一个五角星的JButton哟。
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