Drawing an image from a 2D array of colors in java

gistfile1.java

package graphics;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;

import javax.swing.JFrame;
import javax.swing.JPanel;

import net.miginfocom.swing.MigLayout;
import algorithm.parts.Cell;
import algorithm.parts.State;


public class SimpleDisplay implements Display {

        private final int scale = 5;
        
        private final JFrame frame;
        private final MyPanel panel;
        
        public SimpleDisplay(State state) {
                int n = state.getGrid().length * scale;
                int m = state.getGrid()[0].length * scale;
                
                frame = new JFrame("Simulation");
                frame.setLayout(new MigLayout("fill"));
                frame.setMinimumSize(new Dimension(n, m));
                frame.setVisible(true);
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                
                panel = new MyPanel(state);
                frame.add(panel, "grow");
        }
        
        @Override
        public void draw(State state) {
                panel.setState(state);
                frame.repaint();
        }
        
        @SuppressWarnings("serial")
        private class MyPanel extends JPanel {
                
                private State state;
                
                private MyPanel(State state) {
                        this.state = state;
                }
                
                public void setState(State state) {
                        this.state = state;
                }
                
                @Override
                protected void paintComponent(Graphics g) {
                        super.paintComponent(g);
                        
                        Cell[][] grid = state.getGrid();
                        for (int i = 0; i < grid.length; i++)
                        {
                                for (int j = 0; j < grid[0].length; j++)
                                {
                                        g.setColor(new Color(grid[i][j].rgb));
                                        g.fillRect(i * scale, j * scale, scale, scale);
                                }
                        }
                        
                }
                
        }
}