How do I draw a line in Java 2D?
Date: 2012-05-21. Category: 2D Geometry examples. Hits: 1K time(s).
The following code snippet show you how to draw a simple line using Graphics2D.draw() method. This method take a parameter that implements the java.awt.Shape interface.
To draw a line we can use the Line2D.Double static-inner class. This class constructor takes four integers values that represent the start (x1, y1) and end (x2, y2) coordinate of the line.
package org.kodejava.example.awt.geom;
import javax.swing.*;
import java.awt.*;
import java.awt.geom.Line2D;
public class DrawLine extends JApplet {
@Override
public void paint(Graphics g) {
//
// Draw a simple line using the Graphics2D draw() method.
//
Graphics2D g2 = (Graphics2D) g;
g2.setStroke(new BasicStroke(2f));
g2.setColor(Color.RED);
g2.draw(new Line2D.Double(50, 150, 250, 350));
g2.setColor(Color.GREEN);
g2.draw(new Line2D.Double(250, 350, 350, 250));
g2.setColor(Color.BLUE);
g2.draw(new Line2D.Double(350, 250, 150, 50));
g2.setColor(Color.YELLOW);
g2.draw(new Line2D.Double(150, 50, 50, 150));
g2.setColor(Color.BLACK);
g2.draw(new Line2D.Double(0, 0, 400, 400));
}
public static void main(String[] args) {
JFrame frame = new JFrame("Draw Line");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JApplet applet = new DrawLine();
frame.getContentPane().add(applet);
frame.pack();
frame.setSize(new Dimension(420, 440));
frame.setVisible(true);
}
}
When you run the snippet it will show you something like:
