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Draw a Triangle using a Line2D
Posted on: October 16, 2008 at 12:00 AM

To draw a triangle, we are using Line2D class of package java.awt.geom.*. This class provides a line segment in (x, y) coordinate space. We have draw three line segments using the class Line2D to create a triangle.

Draw a Triangle using a Line2D

This section illustrates you how to draw a triangle using a Line2D.

To draw a triangle, we are using Line2D class of package java.awt.geom.*. This class provides a line segment in (x, y) coordinate space. We have draw three line segments using the class Line2D to create a triangle.

The setPaint() method paints the line segment.

Here is the code of DrawTriangleUsingLine.java


import java.awt.*;

import javax.swing.*;

import java.awt.event.*;

import java.awt.geom.Line2D;



public class DrawTriangleUsingLine2D extends JApplet {

  public void init() {

  setBackground(Color.lightGray);

  }

  public void paint(Graphics g) {

  Graphics2D g2d = (Graphics2D) g;

  g2d.setPaint(Color.red);

  g2d.draw(new Line2D.Double(50,150,150,150 ));

  g2d.draw(new Line2D.Double(50,50,150,150 ));

  g2d.draw(new Line2D.Double(50,50,50,150 ));

  }

  public static void main(String s[]) {

  JFrame frame = new JFrame("Show Triangle");

  JApplet applet = new DrawTriangleUsingLine2D();

  frame.getContentPane().add("Center", applet);

  applet.init();

  frame.setSize(300, 250);

  frame.show();

  }

}

Output will be displayed as:

Download Source Code

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