How do I represent/work with an Ellipse2D and a Rectangle as one shape?

Question

I want to draw a simple stick figure. This requires a circle and some rectangles. I could seperatly draw the head, torso, etc. with many g2d.fill() calls. However, if possible I'd like to be able to represent it as one shape and draw it with one fill call. Also, if I wanted to move the stick figure 10 pixels right, I'd currently have to change the x coordinate on the ellipse + 10 and the x coordinate on the rectangle + 10 and so on. I'd like to be able to change a single x coordinate that then moves all off the separate components over.

How can I accomplish this?

Code:

public class StickFigure{
    Ellipse2D head = new Ellipse2D.Double(0, 0, 100, 100);
    Rectangle torso = new Rectangle(100, 100, 50, 110); 
    Rectangle rightArm;
    ...
}

What I have to do:

g2d.fill(sf.head);
g2d.fill(sf.torso);
...

What I want to do:

g2d.fill(sf.figure) //figure being a shape which includes both head and torso

What I have to do:

     sf.head.x = 3;
     sf.head.y = 4;
     sf.torso.x = 3;
     sf.torso.y = 4;
     g2d.fill(sf.head);
     g2d.fill(sf.torso);
     ...

What I want to do:

sf.figure.x = 3; //which shifts both the head and the torso
sf.figure.y = 4; // ^^
g2d.fill(sf.figure);

Answer 1

You can create a BufferedImage to represent your stick figure. Then you draw the rectangles and ellipsis onto the BufferedImage.

BufferedImage bi = new BufferedImage(...);
Graphics2D g2d = bi.getGraphics();
g2d.fillOval(...);
g2d.fillRect(...);

The BufferedImage would be an instance variable that you create when you construct the class. Then you can just paint the BufferedImage in your paintComponent() method.

graphics.drawImage(bi, ...);

Then whenever you want to move the image you can just change the x/y values in the drawImage(...) method.

Answer 2

The different shapes that make up a stick figure can be turned into a single Area.

class StickFigure {

    private Area stickFigure;
    private Color color;

    StickFigure(Color color, int x) {
        this.color = color;
        stickFigure = new Area(new Ellipse2D.Double(x, 0, 100, 100));
        stickFigure.add(new Area(new Rectangle(x+25, 100, 50, 110)));
    }

    public Area getStickFigure() {
        return stickFigure;
    }

    public void draw(Graphics2D g) {
        g.setColor(color);
        g.fill(stickFigure);
    }
}

MCVE

import java.awt.*;
import java.awt.geom.*;
import java.util.ArrayList;
import javax.swing.*;
import javax.swing.border.EmptyBorder;

public class StickFigurePainter {

    private JComponent ui = null;

    StickFigurePainter() {
        initUI();
    }

    public void initUI() {
        if (ui != null) {
            return;
        }

        ui = new JPanel(new BorderLayout(4, 4));
        ui.setBorder(new EmptyBorder(4, 4, 4, 4));

        ArrayList<StickFigure> list = new ArrayList<StickFigure>();
        list.add(new StickFigure(Color.RED, 0));
        list.add(new StickFigure(Color.GREEN, 110));
        list.add(new StickFigure(Color.BLUE, 220));
        
        ui.add(new StickCanvas(list));
    }

    public JComponent getUI() {
        return ui;
    }

    public static void main(String[] args) {
        Runnable r = new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception useDefault) {
                }
                StickFigurePainter o = new StickFigurePainter();

                JFrame f = new JFrame(o.getClass().getSimpleName());
                f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                f.setLocationByPlatform(true);

                f.setContentPane(o.getUI());
                f.pack();
                f.setMinimumSize(f.getSize());

                f.setVisible(true);
            }
        };
        SwingUtilities.invokeLater(r);
    }
}

class StickCanvas extends JPanel {

    private ArrayList<StickFigure> stickFigures;

    StickCanvas(ArrayList<StickFigure> stickFigures) {
        this.stickFigures = stickFigures;
    }

    @Override
    protected void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        for (StickFigure stickFigure : stickFigures) {
            stickFigure.draw(g2);
        }
    }

    @Override
    public Dimension getPreferredSize() {
        Area area = new Area();
        for (StickFigure stickFigure : stickFigures) {
            area.add(stickFigure.getStickFigure());
        }
        return area.getBounds().getSize();
    }
}

class StickFigure {

    private Area stickFigure;
    private Color color;

    StickFigure(Color color, int x) {
        this.color = color;
        stickFigure = new Area(new Ellipse2D.Double(x, 0, 100, 100));
        stickFigure.add(new Area(new Rectangle(x+25, 100, 50, 110)));
    }

    public Area getStickFigure() {
        return stickFigure;
    }

    public void draw(Graphics2D g) {
        g.setColor(color);
        g.fill(stickFigure);
    }
}