匿名用户

1级

2010-12-14 回答

椭圆按钮要重新绘制按钮才行，对你来说可能会比较难。

import javax.swing.ImageIcon;

import javax.swing.JButton;

public class EllipseButton extends JButton {

static final long serialVersionUID=80;

public EllipseButton(String text){

super(text);

// 创建自己的UI

this.setUI(EllipseButtonUI.createUI(this));

// 取消按钮的边框

this.setBorder(null);

// 不用内容窗格的背景

this.setContentAreaFilled(false);

// 设定边缘

this.setMargin(new Insets(8, 14, 8, 14));

}

public EllipseButton(ImageIcon image){

super(image);

// 创建自己的UI

this.setUI(EllipseButtonUI.createUI(this));

// 取消按钮的边框

this.setBorder(null);

// 不用内容窗格的背景

this.setContentAreaFilled(false);

// 设定边缘

this.setMargin(new Insets(-1,-1,-1,-1));

}

}

import java.awt.BasicStroke;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.Rectangle;

import java.awt.RenderingHints;

import java.awt.Stroke;

import java.awt.geom.Arc2D;

import java.awt.geom.Ellipse2D;

import javax.swing.AbstractButton;

import javax.swing.ButtonModel;

import javax.swing.JComponent;

import javax.swing.UIManager;

import javax.swing.plaf.ComponentUI;

import javax.swing.plaf.basic.BasicButtonUI;

public class EllipseButtonUI extends BasicButtonUI {

protected static EllipseButtonUI singleton = new EllipseButtonUI();

// 创建Stroke用于画按钮

protected static Stroke thickStroke = new BasicStroke(2.0f);

public static ComponentUI createUI(JComponent c) {

return singleton;

}

public void paint(Graphics g, JComponent c) {

// 获得Graphics2D的对象，并开启抗锯齿处理

Graphics2D g2 = (Graphics2D) g;

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_ON);

// 得到按钮的大小

AbstractButton b = (AbstractButton) c;

Rectangle viewRect = new Rectangle();

viewRect.x = 0;

viewRect.y = 0;

viewRect.width = b.getWidth() - 1;

viewRect.height = b.getHeight() - 1;

// 缩小矩形以显示抗锯齿效果

viewRect.grow(-2, -2);

// 在按钮矩形内创建椭圆

Ellipse2D ellipse = new Ellipse2D.Float();

ellipse.setFrame(viewRect.getX(), viewRect.getY(), viewRect.getWidth(),

viewRect.getHeight());

// 判断按钮有无被按下

ButtonModel model = b.getModel();

boolean pressed = (model.isArmed() && model.isPressed())

|| model.isSelected();

// 根据按钮按下与否设置画笔颜色

if (pressed) {

Color background = UIManager.getColor("Button.select");

g2.setPaint(background == null ? Color.gray : background);

} else

g2.setPaint(UIManager.getColor("control"));

// 填充椭圆按钮

g2.fill(ellipse);

// 根据椭圆按钮的大小来设定边框大小.

Arc2D arc = new Arc2D.Float();

arc.setFrame(viewRect.getX(), viewRect.getY(), viewRect.getWidth(),

viewRect.getHeight());

arc.setArcType(Arc2D.OPEN);

// 设定边框指定弧度的区域

arc.setAngles(viewRect.getWidth(), 0, 0, viewRect.getHeight());

g2.setStroke(thickStroke);

// 根据按钮按下与否设定画笔的颜色

g2.setPaint(pressed ? UIManager.getColor("controlDkShadow") : UIManager

.getColor("controlHighlight"));

g2.draw(arc);

arc.setAngles(0, viewRect.getHeight(), viewRect.getWidth(), 0);

g2.setPaint(pressed ? UIManager.getColor("controlHighlight")

: UIManager.getColor("controlShadow"));

g2.draw(arc);

super.paint(g, c);

// 将图形上下文恢复原来的抗锯齿属性的设置

g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,

RenderingHints.VALUE_ANTIALIAS_OFF);

}

public Dimension getPreferredSize(JComponent c) {

AbstractButton b = (AbstractButton) c;

Dimension dim = super.getPreferredSize(c);

// 调整高度和宽度，为了更好的显示效果

dim.height += (b.getMargin().top + b.getMargin().bottom);

dim.width += (b.getMargin().left + b.getMargin().right);

return dim;

}

}

public class Test extends JFrame {

public Test() {

EllipseButton b = new EllipseButton("按钮");

add(b);

setSize(150, 100);

}

/**

* @param args

*/

public static void main(String[] args) {

new Test().setVisible(true);

}

}

==================================

老大，我都调试过了才发出来的。无语了......

你看代码了没？

里面是3个类？你要分别创建3个类，把代码分别放到各自的类里，哎~~~~~~