Added box and background sprites, background image class, tiles with sprites, some error handling

src/BackgroundImage.java

@@ -0,0 +1,25 @@
+import java.awt.*;
+import java.awt.image.BufferedImage;
+
+public class BackgroundImage {
+    public int x, y;
+    public int width, height;
+    public BufferedImage backgroundImage;
+
+    public BackgroundImage(int x, int y, BufferedImage backgroundImage, int width, int height) throws SpriteException {
+        int compressionRatio;
+
+        this.x = x;
+        this.y = y;
+        this.width = width;
+        this.height = height;
+
+        this.backgroundImage = backgroundImage;
+        // compressionRatio = Math.max(backgroundImage.getWidth() / width, backgroundImage.getHeight() / height);
+        // this.backgroundImage = backgroundImage.getSubimage((backgroundImage.getWidth() - width)/2,
+        //         (backgroundImage.getHeight() - height)/2, width, height);
+    }
+    public void draw(Graphics g){
+        g.drawImage(backgroundImage, x, y, width, height, null);
+    }
+}

src/GameFrame.java

@@ -4,6 +4,7 @@ Runs the constructor in GamePanel class
 
 */ 
 import java.awt.*;
+import java.io.IOException;
 import javax.swing.*;
 
 public class GameFrame extends JFrame{
@@ -23,7 +24,14 @@ public class GameFrame extends JFrame{
       }
     }
     menu.setVisible(false); // hide menu when game has launched
+    try {
       game = new GamePanel(); //run GamePanel constructor
+    } catch (IOException | SpriteException e) {
+      // TODO: handle IO errors gracefully
+      // exceptions are raised when tiles are not found or are of incorrect dimensions
+      menu.setVisible(true);
+      menu.launchGame.setText("Invalid sprites error");
+    }
     this.add(game);
     this.setTitle("GUI is cool!"); //set title for frame
     this.setResizable(false); //frame can't change size

src/GamePanel.java

@@ -26,6 +26,7 @@ public class GamePanel extends JPanel implements Runnable, KeyListener{
   public Image image;
   public Graphics graphics;
   public Player player;
+  public BackgroundImage background;
   public int frame;
   // keeps track of how many ticks has elapsed since last frame change
   public int frameCounter = 0;
@@ -34,7 +35,13 @@ public class GamePanel extends JPanel implements Runnable, KeyListener{
 
   public static ArrayList<Tile>map = new ArrayList<Tile>();
 
-  public GamePanel(){
+  // image imports begin here
+  public BufferedImage backgroundImage = getImage("img/backgrounds/pointyMountains.png");
+  public BufferedImage box = getImage("img/tiles/boxes/box.png");
+  public BufferedImage boxCoin = getImage("img/tiles/boxes/boxCoin.png");
+
+  public GamePanel() throws IOException, SpriteException {
+    background = new BackgroundImage(0, 0, backgroundImage, GAME_WIDTH, GAME_HEIGHT);
     for (int i = 0; i < 11; i++) {
       try {
         BufferedImage sprite = getImage(String.format("img/walk/p1_walk%s.png", String.format("%1$2s", i+1).replace(' ', '0')));
@@ -49,9 +56,10 @@ public class GamePanel extends JPanel implements Runnable, KeyListener{
       }
     }
     player = new Player(GAME_WIDTH/2, GAME_HEIGHT/2, 'W', 'A', 'S', 'D', spriteArray); //create a player controlled player, set start location to middle of screenk
-    map.add(new Tile(1000, 500));
-    map.add(new Tile(700, 400));
-    map.add(new Tile(1000, 300));
+    // the height of 35 is set because it is half of the original tile height (i.e., 70px)
+    map.add(new SingleTile(1000, 500, box, 35));
+    map.add(new SingleTile(700, 400, boxCoin, 35));
+    map.add(new SingleTile(1000, 300, boxCoin, 35));
     map.add(new Tile(700, 200));
     this.setFocusable(true); //make everything in this class appear on the screen
     this.addKeyListener(this); //start listening for keyboard input
@@ -81,6 +89,7 @@ public class GamePanel extends JPanel implements Runnable, KeyListener{
 
   //call the draw methods in each class to update positions as things move
   public void draw(Graphics g, int frame){
+    background.draw(g);
     frameCounter += player.draw(g, frame);
     for(Tile i: map){
       i.draw(g);

src/MenuPanel.java

@@ -7,7 +7,7 @@ import java.util.Arrays;
 public class MenuPanel extends JFrame implements ActionListener {
 
     private Boolean buttonClicked = false;
-    JButton launchGame;
+    public JButton launchGame;
     Container menuContainer;
 
     public MenuPanel() {

src/SingleTile.java

@@ -0,0 +1,21 @@
+import java.awt.*;
+import java.awt.image.BufferedImage;
+
+public class SingleTile extends Tile {
+    public int length;
+    public BufferedImage tileImage;
+
+    public SingleTile(int x, int y, BufferedImage tileImage, int length) throws SpriteException {
+        super(x, y);
+
+        if (tileImage.getWidth() != tileImage.getHeight()) {
+            throw new SpriteException();
+        }
+
+        this.length = length;
+        this.tileImage = tileImage;
+    }
+    public void draw(Graphics g){
+        g.drawImage(tileImage, x, y, length, length, null);
+    }
+}

src/SpriteException.java

@@ -0,0 +1,5 @@
+public class SpriteException extends Exception {
+    public SpriteException() {
+        super("Tile sprites must have equal lengths and heights.");
+    }
+}

src/Tile.java

@@ -1,5 +1,6 @@
 import java.awt.*;
 
+// all tiles must be squares
 public class Tile {
     public int x;
     public int y;