aboutpanel.java

一个简单有效的CMM语言的词法分析器,带图形界面

package com.lexical.src;
import com.lexical.src.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.font.*;
import java.awt.geom.*;

public class AboutPanel extends JPanel
{
	public AboutPanel(int width,int height)
	{
		title = "词法分析器图形模拟程序1.0.2";
		copyright = "©2008 作者。保留所有权利。";
		panelWidth = width;
		panelHeight = height;
	}
	public void paintComponent(Graphics g)
	{
		Graphics2D g2 = (Graphics2D)g;
		
		//draw title string
		Font titleFont = new Font("sans",Font.BOLD,18);
		Rectangle2D bouds = getBouds(titleFont,title,g2);
		double x = (getWidth()-bouds.getWidth())/2;
		double y = (getHeight()-bouds.getHeight())/2;
		System.out.println("title panel width: "+getWidth()+"bouds:"+bouds.getWidth());
		System.out.println("title panel height: "+getHeight()+"bouds:"+bouds.getHeight());
		g2.setFont(titleFont);		
		g2.drawString(title,(int)x,(int)y);
		
		//draw copyrigth String
		Font copyFont = new Font("sansSerif",Font.PLAIN,12);
		bouds = getBouds(copyFont,copyright,g2);
		x = (getWidth()-bouds.getWidth())/2;
		y = (getHeight()-bouds.getHeight())/2;
		g2.setFont(copyFont);
		g2.drawString(copyright,(int)x,(int)y+18);
	}
	private Rectangle2D getBouds(Font f,String message,Graphics2D g2)
	{
		FontRenderContext context = g2.getFontRenderContext();
		return f.getStringBounds(message.trim(),context);
	}
	private String title;
	private String copyright;
	private int panelHeight;
	private int panelWidth;
	
}