Is it possible to set multiple objects created in paintComponent to one whole variable? i.e. A face made up of a rectangle, line and ellipse

Question

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;
import javax.swing.JComponent;

/*
 * This component will draw an "Alien" face
 */ 

public class FaceComponent extends JComponent 
{

//Create a constructor that will create a face and place it in a variable.

public void paintComponent(Graphics g)
{
    //Recover Graphics2D
    super.paintComponent(g);
    Graphics2D g2 = (Graphics2D) g;

    //Construct the alien face

    //Draw the  head
    Ellipse2D.Double head = new Ellipse2D.Double (5, 80, 100, 150);
    g2.draw(head);

    //Draw the set of eyes
    g2.setColor(Color.GREEN);
    Rectangle eye = new Rectangle(25, 140, 15, 15);
    g2.fill(eye);
    eye.translate(50, 0);
    g2.fill(eye);

    //Draw the mouth
    Line2D.Double mouth = new Line2D.Double(30, 180, 80, 180);
    g2.setColor(Color.RED);
    g2.draw(mouth);

    //Draw the greeting
    g2.setColor(Color.BLUE);
    g2.drawString("Hello, World!", 20, 245);
}
}

I want to make this "face" that is created assigned to one single public value, and set it to x and y coordinates, so that when I'm creating methods for my movement class, I will be able to move the face around using loops.

I can't figure out a better way to do this, if someone is able to enlighten me on a different method, I'd be more than willing to find out on my own. Just looking for someone to point me in the right direction.

Answer 1

I want to make this "face" that is created assigned to one single public value

The 'OO' way would be to design a Face class that understands how (and where) to draw a Face when requested to do so. The class might look like this:

class Face {

    private Point location;

    Face(Point location) {
        this.location = location;
    }

    /**
     * @param location the location to set
     */
    public void setLocation(Point location) {
        this.location = location;
    }

    public void draw(Graphics2D g) {
        /* save this to reset it after painting. */
        AffineTransform transform = g.getTransform();        

        AffineTransform move = AffineTransform.getTranslateInstance(
                location.getX(), location.getY());
        g.setTransform(move);

        //Construct the alien face
        //Draw the  head
        g.setColor(Color.DARK_GRAY); // explicitly set a color
        Ellipse2D.Double head = new Ellipse2D.Double(5, 80, 100, 150);
        g.fill(head);
        g.setColor(Color.LIGHT_GRAY);
        g.draw(head);

        //Draw the set of eyes
        g.setColor(Color.GREEN);
        Rectangle eye = new Rectangle(25, 140, 15, 15);
        g.fill(eye);
        eye.translate(50, 0);
        g.fill(eye);

        //Draw the mouth
        Line2D.Double mouth = new Line2D.Double(30, 180, 80, 180);
        g.setColor(Color.RED);
        g.draw(mouth);

        //Draw the greeting
        g.setColor(Color.BLUE);
        g.drawString("Hello, World!", 20, 245);

        // reset the transform to the original (so later painting is not moved)
        g.setTransform(transform);
    }
}

Then the FaceComponent class can be simplified to this:

/*
 * This component will draw "Alien" faces
 */
public class FaceComponent extends JComponent {

    Face[] faces = new Face[3];

    FaceComponent() {
        Random r = new Random();
        for (int ii=0; ii<faces.length; ii++) {
            Point p = new Point(r.nextInt(200), r.nextInt(100));
            faces[ii] = new Face(p);
        }
    }

//Create a constructor that will create a face and place it in a variable.
    public void paintComponent(Graphics g) {
        //Recover Graphics2D
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D) g;

        for (Face face : faces) {
            face.draw(g2);
        }
    }

    Dimension prefSize = new Dimension(180, 260);

    @Override
    public Dimension getPreferredSize() {
        return prefSize;
    }

    public static void main(String[] args) {
        Runnable r = new Runnable() {

            @Override
            public void run() {
                JOptionPane.showMessageDialog(null, new FaceComponent());
            }
        };
        SwingUtilities.invokeLater(r);
    }
}