How to create a Graphics2D instance?

What's the easiest way in Java SE 7 to obtain an instance just to plot a few points for debugging? Desktop environment.

3 Answers

You could use a BufferedImage:

BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics2D = image.createGraphics();

The easiest and safest way is to use to cast the Graphics reference in paintComponent and cast it as needed. That way the Object is correctly initialized. This reference can be passed to other custom painting methods as required.

@Override
public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D)g; ...
}

You should probably just create a JPanel and paint on it.

public class MyPanel extends JPanel { @Override public void paintComponent(Graphics g) { super.paintComponent(g); Graphics2D g2d = (Graphics2D) g; .... // my painting }
}