roundbutton.java

这里面有150个从简单到难的java 程序的源代码

import java.awt.*;
import java.awt.geom.*;
import javax.swing.*;
import java.net.*;

public class RoundButton extends JButton {
    
    public RoundButton(String label) {
        super(label);

        // These statements enlarge the button so that it
        // becomes a circle rather than an oval.
        Dimension size = getPreferredSize();
//        size.width = size.height = Math.max(size.width, size.height);
        setPreferredSize(size);

        // This call causes the JButton not to paint the background.
        // This allows us to paint a round background.
        setContentAreaFilled(false);
    }

    // Paint the round background and label.
    protected void paintComponent(Graphics g) {
	if (getModel().isArmed()) {
            // You might want to make the highlight color
            // a property of the RoundButton class.
            g.setColor(Color.lightGray);
        } else {
            g.setColor(getBackground());
        }
	g.fillOval(0, 0, getSize().width-1, getSize().height-1);

        // This call will paint the label and the focus rectangle.
	super.paintComponent(g);
    }

    // Paint the border of the button using a simple stroke.
    protected void paintBorder(Graphics g) {
        g.setColor(getForeground());
        g.drawOval(0, 0, getSize().width-1, getSize().height-1);
    }

    // Hit detection.
    Shape shape;
    public boolean contains(int x, int y) {
        // If the button has changed size, make a new shape object.
        if (shape == null || !shape.getBounds().equals(getBounds())) {
            shape = new Ellipse2D.Float(0, 0, getWidth(), getHeight());
        }
        return shape.contains(x, y);
    }

    
    
    // Test routine.
    public static void main(String[] args) {
        // Create a button with the label.
	JButton button = new RoundButton("圆形按钮");
        JButton b2;
	ImageIcon ic;
	button.setBackground(Color.green);
        
        // Create a frame in which to show the button.
        ic = new ImageIcon("Red.GIF");
	b2=new JButton(ic);
	JFrame frame = new JFrame();
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setBackground(Color.yellow);
        frame.getContentPane().add(button);
        frame.getContentPane().setLayout(new FlowLayout());
        frame.getContentPane().add(b2);
	frame.setSize(300, 200);
        frame.setVisible(true);
    }
}