// Stuart Reges
// 1/26/00
// grader: self
//
// Class CritterPanel displays a grid of critters

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class CritterPanel extends JPanel
{
        public CritterPanel(CritterModel model)
        {
                myModel = model;
                // construct font and compute char width once in constructor
                // for efficiency
                myFont = new Font("Monospaced", Font.BOLD, FONT_SIZE);
                setBackground(Color.cyan);
        }

        public void paintComponent(Graphics g)
        {
                super.paintComponent(g);
                g.setFont(myFont);
                int height = myModel.getHeight();
                int width = myModel.getWidth();
                // because font is monospaced, all widths should be the same;
                // so we can get char width from any char (in this case x)
                int charWidth = g.getFontMetrics().charWidth('x');
                int extraX = getWidth() - (width + 1) * charWidth;
                int extraY = getHeight() - (height - 1) * FONT_SIZE;
                for (int i = 0; i < width; i++)
                        for (int j = 0; j < height; j++)
                                g.drawString("" + myModel.getChar(i, j),
                                             extraX/2 + i * charWidth,
                                             extraY/2 + j * FONT_SIZE);
        }

        private CritterModel myModel;
        private Font myFont;

        public static final int FONT_SIZE = 12;
}