package com.java.move;

import java.awt.Color;

import java.awt.Dimension;

import java.awt.Graphics;

import java.awt.GraphicsConfiguration;

import java.awt.HeadlessException;

import java.awt.Toolkit;

import java.awt.event.KeyAdapter;

import java.awt.event.KeyEvent;

import javax.swing.*;

/*

 *

 * author : deng_hui_long

 * Date   : 2013-10-16

 *

 */

public class TextMove extends JFrame {

	private int width = 500;// 窗口的宽度

	private int height = 500;// 宽口的高度

	private Toolkit took = null;// 将各个组件绑定

	private TextPanel textPanel = null;

	public static void main(String[] args) {

		new TextMove().show();

	}

	public TextMove() {

		setTitle("移动的小球");

		took = Toolkit.getDefaultToolkit();

		Dimension dm = took.getScreenSize();// 获取屏幕的 宽度和高度

		int swidth = (dm.width - this.width) / 2;

		int sheight = (dm.height - this.height) / 2;

		setLocation(swidth, sheight);// 窗口居于屏幕中间

		setSize(width, height);// 设置窗体的大小

		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);// 关闭

		textPanel = new TextPanel(10, 10);// 面板

		add(textPanel);// 添加面板

		addKeyListener(new Keyent());// 添加键盘事件

	}

	// 键盘事件

	class Keyent extends KeyAdapter {

		@Override

		public void keyPressed(KeyEvent e) {

			if (e.getKeyCode() == KeyEvent.VK_UP) {// 上

				textPanel.y -= 5;

			} else if (e.getKeyCode() == KeyEvent.VK_DOWN) {// 下

				textPanel.y += 5;

			} else if (e.getKeyCode() == KeyEvent.VK_LEFT) {// 左

				textPanel.x -= 5;

			} else if (e.getKeyCode() == KeyEvent.VK_RIGHT) {// 右

				textPanel.x += 5;

			}

			textPanel.repaint();// 重新绘图

		}

	}

	// 继承面板在面板上绘图

	class TextPanel extends JPanel {// 继承面板

		int x;

		int y;

		public TextPanel(int x, int y) {

			this.x = x;

			this.y = y;

		}

		public void paint(Graphics g) {// 在面板上绘图

			super.paint(g);

			g.setColor(Color.black);// 设置画笔的颜色

			g.fillOval(x, y, 20, 20);// 画圆

		}

	}

}