在JPanel中绘制

Question

i have my class declared:

public class myRightPanel extends JPanel

then i override the paintComponent of my super class like this:

public void paintComponent(Graphics g){  
        super.paintComponents(g);
                //Draw bunch of things here
}

Now it turns out i also need a method which takes in two integer(x,y) parameters and adds something to my already drawn myRightPanel at that coordinates. How do i do this when i have already overridden my paintComponent() ?

Answer 1

Store the x,y as a Point as an attribute of the class so it is accessible within the paint method. Call repaint() .

Answer 2

You need to use the Graphics object to draw any content you want.

For example:

public void paintComponent(Graphics g){  
  super.paintComponents(g);
  g.drawString("Hello test", 0, 0);
}

I recommend reading Java 2D tutorial: http://docs.oracle.com/javase/tutorial/2d/index.html