import java.awt.*;
import javax.swing.*;
public class MessagePanel extends JPanel{
	private String message = "欢迎使用";
	private int xCoordinate = 20;
	private int yCoordinate = 20;
	private boolean centered;
	private int interval = 10;
	public MessagePanel(){
	}
	
	public MessagePanel(String message){
		this.message = message;
	}
	public String  getMessage(){
		return message;
	
	}
	public void setMessage(String message){
		this.message = message;
		repaint();
	}
	public int getxCoordinate(){
		return xCoordinate;
	}
	public void setXCoordinate(int x){
		this.xCoordinate = x;
		repaint();
	}
	public int getyCoordinate(){
		return yCoordinate;
	}
	public void setyCoordinate(int y){
		this.yCoordinate = y;
		repaint();
	}
	public boolean isCentered(){
		return centered;
	}
	public void setCentered(boolean centered){
		this.centered = centered;
		repaint();
	}
	public int getInterval(){
		return interval;
	}
	
	public void setInterval(int interval){
		this.interval = interval;
		repaint();
	}
	protected void paintComponent(Graphics g){
		super.paintComponent(g);
		
		if(centered){
			FontMetrics fm =g.getFontMetrics();
			int stringWidth=fm.stringWidth(message);
			int stringAscent = fm.getAscent();
			xCoordinate = getWidth()/2-stringWidth/2;
			yCoordinate = getHeight()/2+stringAscent/2;
		}
		g.drawString(message, xCoordinate, yCoordinate);
	}
	public void moveLeft(){
		xCoordinate-=interval;
		repaint();
	}
	public void moveRight(){
		xCoordinate+=interval;
		repaint();
	}
	public void moveUp(){
		yCoordinate-=interval;
		repaint();
	}
	public void moveDown(){
		yCoordinate+=interval;
		repaint();
	}
			

	public Dimension getPreferredSize(){
		return new Dimension(200,30);
	}

}