学以致用——Java源码——使用Graphics类drawRect方法绘制表格（Grid Using Method drawRect）

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程序功能：

使用Graphics类drawRect方法绘制10*10表格。

运行结果：

源码：

1. 实体类

//Creating JFrame to display DrawPanel.
import javax.swing.JPanel;
import java.awt.Color;
import java.awt.Graphics;

/**
 * 13.13 (Grid Using Method drawRect) Write an application that draws a 10-by-10
 * grid. Use the Graphics method drawRect.
 * 
 * @author [email protected]
 * @Date Jan 22, 2019, 20:34:03 PM
 *
 */
public class GridDrawRectJPanel extends JPanel
{
 
	public void paint(Graphics g)
	{
	       super.paintComponents(g);
		   int width = getWidth(); // total width   
		   int height = getHeight(); // total height
		   int rRed=0;
		   int rGreen=0;
		   int rBlue=0;
		   int offset = 60;  //10*10的表格，每个单元格边长10个像素，60为表格整体偏移量

		   //Color of arc, below color is called "Taibao Lan"
		   rRed = 21;
		   rGreen = 101;
		   rBlue = 192;
		   Color color=new Color(rRed, rGreen, rBlue);
		   
		   
		   //绘制1个10*10的表格
		   for (int i = 10; i > 0;i--){
			   for (int j = 10; j >0;j--) {
			   g.setColor(color);
			   g.drawRect(width/2-(j+1)*10+offset, height/2-(i+1)*10+offset, 10, 10);} 

			   }	   

	}
		
} 

2. 测试类

import java.awt.BorderLayout;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;

import javax.swing.JFrame;
import javax.swing.JTextArea;


public class DrawGridUsingDrawRect {
	
	static JTextArea statusBar = new JTextArea();
	
	public static void main(String[] args)
	{
	 // create a panel that contains our drawing
		GridDrawRectJPanel panel = new GridDrawRectJPanel();

		
		MouseHandler handler = new MouseHandler(); 
		panel.addMouseMotionListener(handler);

		

	 // create a new frame to hold the panel
	 JFrame application = new JFrame();
	 application.setTitle("绘制表格");
	 
	 // set the frame to exit when it is closed
	 application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	 
	 application.add(panel,BorderLayout.CENTER); // add the panel to the frame
	 application.add(statusBar,BorderLayout.SOUTH);
	 application.setSize(280, 280); // set the size of the frame
	 application.setVisible(true); // make the frame visible    
	} 
	
	static class MouseHandler extends  MouseMotionAdapter 
	{
	   
	   // handle event when mouse enters area
		@Override
	   public void mouseMoved(MouseEvent event)
	   {  
			 statusBar.setText(String.format("光标当前坐标：[%d, %d]", 
		 	            event.getX(), event.getY()));;
	   }

	}
	

}