Draw lines with java.awt.Graphics - Java 2D Graphics

Java examples for 2D Graphics:Line

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Description

Draw lines with java.awt.Graphics

Demo Code

import javax.swing.JFrame;
import java.awt.Graphics; 
import javax.swing.JPanel;

class DrawPanel extends JPanel
{
   // draws an X from the corners of the panel
   public void paintComponent(Graphics g)
   {//w w  w. j a  v  a 2  s. com
      // call paintComponent to ensure the panel displays correctly
      super.paintComponent(g);
      
      int width = getWidth(); // total width   
      int height = getHeight(); // total height

      // draw a line from the upper-left to the lower-right
      g.drawLine(0, 0, width, height);
      
      // draw a line from the lower-left to the upper-right
      g.drawLine(0, height, width, 0);
   } 
}

public class Main
{
   public static void main(String[] args)
   {
      // create a panel that contains our drawing
      DrawPanel panel = new DrawPanel();
      
      // create a new frame to hold the panel
      JFrame application = new JFrame();
      
      // set the frame to exit when it is closed
      application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

      application.add(panel); // add the panel to the frame      
      application.setSize(250, 250); // set the size of the frame
      application.setVisible(true); // make the frame visible    
   } 
}

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