Question

can someone help me understand this java code for a game board

Answer 1

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

import javax.swing.JPanel;


public class BoardPanel extends JPanel {


private static final long serialVersionUID = -1102632585936750607L;

public static final int COL_COUNT = 25;


public static final int ROW_COUNT = 25;


public static final int TILE_SIZE = 20;


private static final int EYE_LARGE_INSET = TILE_SIZE / 3;


private static final int EYE_SMALL_INSET = TILE_SIZE / 6;


private static final int EYE_LENGTH = TILE_SIZE / 5;


private static final Font FONT = new Font("Tahoma", Font.BOLD, 25);


private SnakeGame game;


private TileType[] tiles;


public BoardPanel(SnakeGame game) {
this.game = game;
this.tiles = new TileType[ROW_COUNT * COL_COUNT];

setPreferredSize(new Dimension(COL_COUNT * TILE_SIZE, ROW_COUNT * TILE_SIZE));
setBackground(Color.BLACK);
}


public void clearBoard() {
for(int i = 0; i < tiles.length; i++) {
tiles[i] = null;
}
}


public void setTile(Point point, TileType type) {
setTile(point.x, point.y, type);
}


public void setTile(int x, int y, TileType type) {
tiles[y * ROW_COUNT + x] = type;
}


public TileType getTile(int x, int y) {
return tiles[y * ROW_COUNT + x];
}

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


for(int x = 0; x < COL_COUNT; x++) {
for(int y = 0; y < ROW_COUNT; y++) {
TileType type = getTile(x, y);
if(type != null) {
drawTile(x * TILE_SIZE, y * TILE_SIZE, type, g);
}
}
}


g.setColor(Color.DARK_GRAY);
g.drawRect(0, 0, getWidth() - 1, getHeight() - 1);
for(int x = 0; x < COL_COUNT; x++) {
for(int y = 0; y < ROW_COUNT; y++) {
g.drawLine(x * TILE_SIZE, 0, x * TILE_SIZE, getHeight());
g.drawLine(0, y * TILE_SIZE, getWidth(), y * TILE_SIZE);
}
}


if(game.isGameOver() || game.isNewGame() || game.isPaused()) {
g.setColor(Color.WHITE);


int centerX = getWidth() / 2;
int centerY = getHeight() / 2;


String largeMessage = null;
String smallMessage = null;
if(game.isNewGame()) {
largeMessage = "Snake Game!";
smallMessage = "Press Enter to Start";
} else if(game.isGameOver()) {
largeMessage = "Game Over!";
smallMessage = "Press Enter to Restart";
} else if(game.isPaused()) {
largeMessage = "Paused";
smallMessage = "Press P to Resume";
}


g.setFont(FONT);
g.drawString(largeMessage, centerX - g.getFontMetrics().stringWidth(largeMessage) / 2, centerY - 50);
g.drawString(smallMessage, centerX - g.getFontMetrics().stringWidth(smallMessage) / 2, centerY + 50);
}
}


private void drawTile(int x, int y, TileType type, Graphics g) {

switch(type) {


case Fruit:
g.setColor(Color.RED);
g.fillOval(x + 2, y + 2, TILE_SIZE - 4, TILE_SIZE - 4);
break;


case SnakeBody:
g.setColor(Color.GREEN);
g.fillRect(x, y, TILE_SIZE, TILE_SIZE);
break;


case SnakeHead:

g.setColor(Color.GREEN);
g.fillRect(x, y, TILE_SIZE, TILE_SIZE);


g.setColor(Color.BLACK);


switch(game.getDirection()) {
case North: {
int baseY = y + EYE_SMALL_INSET;
g.drawLine(x + EYE_LARGE_INSET, baseY, x + EYE_LARGE_INSET, baseY + EYE_LENGTH);
g.drawLine(x + TILE_SIZE - EYE_LARGE_INSET, baseY, x + TILE_SIZE - EYE_LARGE_INSET, baseY + EYE_LENGTH);
break;
}

case South: {
int baseY = y + TILE_SIZE - EYE_SMALL_INSET;
g.drawLine(x + EYE_LARGE_INSET, baseY, x + EYE_LARGE_INSET, baseY - EYE_LENGTH);
g.drawLine(x + TILE_SIZE - EYE_LARGE_INSET, baseY, x + TILE_SIZE - EYE_LARGE_INSET, baseY - EYE_LENGTH);
break;
}

case West: {
int baseX = x + EYE_SMALL_INSET;
g.drawLine(baseX, y + EYE_LARGE_INSET, baseX + EYE_LENGTH, y + EYE_LARGE_INSET);
g.drawLine(baseX, y + TILE_SIZE - EYE_LARGE_INSET, baseX + EYE_LENGTH, y + TILE_SIZE - EYE_LARGE_INSET);
break;
}

case East: {
int baseX = x + TILE_SIZE - EYE_SMALL_INSET;
g.drawLine(baseX, y + EYE_LARGE_INSET, baseX - EYE_LENGTH, y + EYE_LARGE_INSET);
g.drawLine(baseX, y + TILE_SIZE - EYE_LARGE_INSET, baseX - EYE_LENGTH, y + TILE_SIZE - EYE_LARGE_INSET);
break;
}

}
break;
}
}

}

Answer 2

What part is giving you difficulty?

Answer 3

And it would be great if you posted it as a link...i mean ,use the code paste sites for it. more readable.

eg.:

pastebin.com