parta.txt

用Java写的可以画直线的小程序

import javax.swing.JFrame;
public class DrawMain {


  public static void main(String[] args){
     JFrame app = new JFrame("Line Drawings");
   
     app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      
     app.add( new MyDraw() );	// ****	
   
     app.setSize(250, 250);
     app.setVisible(true);
  }
}import java.awt.Graphics;
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以上是一个类,叫DrawMain
一下的也是一个类,叫MyDraw(你也可以叫别的名字,只需要在***行也叫同样的名字)
***********************
import javax.swing.*;
public class MyDraw  extends JPanel {
	public void paintComponent( Graphics g )
	{
		int height  = getHeight();
		int width = getWidth();
		int startX, startY;
		int count = 1;
		for( startX = 0; startX <= width; startX += width )
		{
			for ( startY = 0; startY <= height; startY += height )
			{
				if( count == 1 || count == 4)
				{
					for( int i = 0; i <= 15; i++ )
						g.drawLine(startX, startY,  (i + 1)* width / 16, height - (i + 1)* height / 16);
				}
				else
				{
					for( int i = 0; i <= 15; i++ )
						g.drawLine(startX, startY,  (i + 1)* width / 16, (i + 1)* height / 16);
				}
				count++;
			}
		}
	}
}