How to create a Graphics2D instance?

问题

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

回答1:

You could use a BufferedImage:

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

回答2:

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;
   ...
}

回答3:

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
    }
}

来源：https://stackoverflow.com/questions/16532704/how-to-create-a-graphics2d-instance