Draw things after painting drawing with paint (JPanel) (java)

Do you mean something like this?

Here's one way to draw a tic tac toe diagram to the left of the GUI. I have a model class that stores the board position in a 2D int array and a mouse controller class that lets me know where the person clicked on the tic tac toe chart.

package com.ggl.tictactoe.view;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
import java.awt.Stroke;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;

import javax.swing.JPanel;

import com.ggl.tictactoe.controller.MouseMoveController;
import com.ggl.tictactoe.model.GameStatus;
import com.ggl.tictactoe.model.TicTacToeModel;

public class TicTacToePanel extends JPanel {

    private static final long serialVersionUID = -9150412950439480699L;

    private MouseMoveController controller;

    private TicTacToeModel model;

    public TicTacToePanel(TicTacToeFrame frame, TicTacToeModel model) {
        this.model = model;
        this.controller = new MouseMoveController(frame, model);
        this.addMouseListener(controller);
        this.setPreferredSize(new Dimension(360, 360));
    }

    public void setComputerMove() {
        if (!model.isPlayerGoesFirst()) {
            controller.setComputerMove();
        }
    }

    @Override
    protected void paintComponent(Graphics g) {
        super.paintComponent(g);

        Graphics2D g2d = (Graphics2D) g;
        g2d.setColor(Color.WHITE);
        g2d.fillRect(0, 0, getWidth(), getHeight());

        int[][] board = model.getBoard();
        int width = getWidth() / board.length;
        int height = getHeight() / board[0].length;

        int x = 0;
        int y = 0;

        Stroke stroke = new BasicStroke(7F);
        g2d.setStroke(stroke);
        g2d.setColor(Color.BLACK);

        x += width;
        for (int i = 0; i < (board.length - 1); i++) {
            g2d.drawLine(x, y, x, getHeight());
            x += width;
        }

        x = 0;
        y += width;
        for (int i = 0; i < (board.length - 1); i++) {
            g2d.drawLine(x, y, getWidth(), y);
            y += width;
        }

        float fontSize = (float) height * 72F / 96F;
        Font largeFont = getFont().deriveFont(fontSize);

        for (int i = 0; i < board.length; i++) {
            x = width * i;
            for (int j = 0; j < board[i].length; j++) {
                y = height * j;
                Rectangle r = new Rectangle(x, y, width, height);
                if (board[i][j] == 1) {
                    g2d.setColor(Color.BLUE);
                    centerString(g2d, r, "X", largeFont);
                } else if (board[i][j] == -1) {
                    g2d.setColor(Color.CYAN);
                    centerString(g2d, r, "O", largeFont);
                }
            }
        }

        if (model.getGameStatus() == GameStatus.TIE_GAME) {
            BufferedImage image = GameOverImage.createImage(getWidth(),
                    getHeight(), "Tie Game");
            g2d.drawImage(image, 0, 0, this);
        } else if (model.getGameStatus() == GameStatus.COMPUTER_WINS) {
            BufferedImage image = GameOverImage.createImage(getWidth(),
                    getHeight(), "Computer Wins");
            g2d.drawImage(image, 0, 0, this);
        } else if (model.getGameStatus() == GameStatus.PLAYER_WINS) {
            BufferedImage image = GameOverImage.createImage(getWidth(),
                    getHeight(), "Player Wins");
            g2d.drawImage(image, 0, 0, this);
        }
    }

    /**
     * This method centers a <code>String</code> in a bounding
     * <code>Rectangle</code>.
     * 
     * @param g2d
     *            - The <code>Graphics2D</code> instance.
     * @param r
     *            - The bounding <code>Rectangle</code>.
     * @param s
     *            - The <code>String</code> to center in the bounding rectangle.
     * @param font
     *            - The display font of the <code>String</code>
     * 
     * @see java.awt.Graphics
     * @see java.awt.Rectangle
     * @see java.lang.String
     */
    private void centerString(Graphics2D g2d, Rectangle r, String s, Font font) {
        FontRenderContext frc = new FontRenderContext(null, true, true);

        Rectangle2D r2D = font.getStringBounds(s, frc);
        int rWidth = (int) Math.round(r2D.getWidth());
        int rHeight = (int) Math.round(r2D.getHeight());
        int rX = (int) Math.round(r2D.getX());
        int rY = (int) Math.round(r2D.getY());

        int a = (r.width / 2) - (rWidth / 2) - rX;
        int b = (r.height / 2) - (rHeight / 2) - rY;

        g2d.setFont(font);
        g2d.drawString(s, r.x + a, r.y + b);
    }

}

      

        
        
        
      

    

And here is the mouse controller code.

package com.ggl.tictactoe.controller;

import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import com.ggl.tictactoe.model.GameStatus;
import com.ggl.tictactoe.model.TicTacToeModel;
import com.ggl.tictactoe.view.TicTacToeFrame;

public class MouseMoveController extends MouseAdapter {

    private ComputerMoveRunnable controller;

    private TicTacToeFrame frame;

    private TicTacToeModel model;

    public MouseMoveController(TicTacToeFrame frame, TicTacToeModel model) {
        this.frame = frame;
        this.model = model;
        this.controller = new ComputerMoveRunnable(frame, model);
    }

    @Override
    public void mousePressed(MouseEvent event) {
        if ((model.getGameStatus() == GameStatus.ACTIVE_GAME)
                && (event.getButton() == MouseEvent.BUTTON1)) {
            int width = frame.getTicTacToePanel().getWidth();
            int height = frame.getTicTacToePanel().getHeight();
            int positionWidth = TicTacToeModel.getPositionWidth();

            Point p = event.getPoint();

            int x = getPosition(p.x, width, positionWidth);
            int y = getPosition(p.y, height, positionWidth);

            int[][] board = model.getBoard();
            if (board[x][y] == 0) {
                model.setPlayerMove(x, y);
                setComputerMove();
            }
        }
    }

    public void setComputerMove() {
        controller.run();
        frame.repaintTicTacToePanel();
    }

    private int getPosition(int location, int dimension, int squareWidth) {
        for (int i = 0; i < squareWidth; i++) {
            if (location < (dimension * (i + 1) / squareWidth)) {
                return i;
            }
        }

        return squareWidth - 1;
    }

}