如何在JPanel上用Java绘制“类”

Question

Currently I am using a JFrame that has a JPanel in it. In my JPanel I have overridden the paint component method, However, I want to "draw" a "Hero" class as a unit. Let me elaborate. The hero class as of right now has two parts: A health bar and an image. Originally, in the paint component method of my JPanel, I was drawing the character and health bar individually.

public void paintComponent(Graphics g){
        g.drawImage(h.getImage(), h.getX(), h.getY(),null);
        g.setColor(Color.red);
        g.fillRect(h.getX()+7, h.getY()-16, 50, 10);
        g.drawLine(h.getX() + (h.getImage().getWidth(getFocusOwner())/2), h.getY()-40, h.getX() + (h.getImage().getWidth(getFocusOwner())/2), h.getY()+40);


    }

This properly aligned the health bar and character together, however, this seemed inefficient and messy. So, is there anyway I could draw the two together as a unit? I pondered making them a separate JPanel, but realized that was a silly idea. Is there anyway to do this more efficiently? One of the biggest reasons i am looking for a solution now is that i would like to be able to extend the character class with other classes IE: Monster, Knight, Goblin but when i draw them their respective health bars and images lined up. If you need any further explanation please ask. Thank you!

Also, to spark any ideas that you might have, I'm imagining something like this. Another thing: Would using canvas be of any use?

paint(Hero);

Thank you again!

Answer 1

In your Hero class define a drawing method which accepts a Graphics object:

public void drawHero(Graphics g)
{
    // implementation
}

Then in your main JPanel subclass draw the Hero with this drawing method:

public void paintComponent(Graphics g)
{
    // other drawing code

    hero.drawHero(g);
}