Fix camera in main screen, and remove unnecessary sleep

src/BackgroundImage.java

@@ -7,8 +7,9 @@ public class BackgroundImage {
     public int width, height;
     public int parallaxRatio;
     public BufferedImage backgroundImage;
+    public Camera camera;
 
-    public BackgroundImage(int x, int y, BufferedImage backgroundImage, int width, int height, int parallaxRatio) {
+    public BackgroundImage(int x, int y, BufferedImage backgroundImage, int width, int height, int parallaxRatio, Camera camera) {
         this.x = x;
         this.y = y;
         this.width = width;
@@ -16,10 +17,12 @@ public class BackgroundImage {
 
         this.backgroundImage = backgroundImage;
         this.parallaxRatio = parallaxRatio;
+
+        this.camera = camera;
     }
     public void draw(Graphics g){
-        g.drawImage(backgroundImage, x-GamePanel.camera.x/parallaxRatio % width, y, width, height, null);
+        g.drawImage(backgroundImage, x-camera.x/parallaxRatio % width, y, width, height, null);
         // added to prevent the background image from disappearing
-        g.drawImage(backgroundImage, x-GamePanel.camera.x/parallaxRatio % width + width - 1, y, width, height, null);
+        g.drawImage(backgroundImage, x-camera.x/parallaxRatio % width + width - 1, y, width, height, null);
     }
 }

src/GamePanel.java

@@ -55,7 +55,7 @@ public class GamePanel extends JPanel implements Runnable, KeyListener{
   public GamePanel(JPanel gameFrame) throws IOException, SpriteException, UnsupportedAudioFileException, LineUnavailableException {
     this.gameFrame = gameFrame;
     camera = new Camera(0);
-    background = new BackgroundImage(0, 0, backgroundImage, GAME_WIDTH, GAME_HEIGHT, 10);
+    background = new BackgroundImage(0, 0, backgroundImage, GAME_WIDTH, GAME_HEIGHT, 10, camera);
     try {
       // load player sprites from disk here
       for (int i = 0; i < 11; i++) {

src/MenuPanel.java

@@ -49,7 +49,7 @@ public class MenuPanel extends JPanel implements Runnable, KeyListener{
         textBoxArray.add(enter);
         textBoxArray.add(settings);
 
-        background = new BackgroundImage(0, 0, backgroundImage, GAME_WIDTH, GAME_HEIGHT, 10);
+        background = new BackgroundImage(0, 0, backgroundImage, GAME_WIDTH, GAME_HEIGHT, 10, camera);
         // the height of 35 is set because it is half of the original tile height (i.e., 70px)
         this.setFocusable(true); //make everything in this class appear on the screen
         this.addKeyListener(this); //start listening for keyboard input
@@ -132,28 +132,12 @@ public class MenuPanel extends JPanel implements Runnable, KeyListener{
             CardLayout cardLayout = (CardLayout) gameFrame.getLayout();
             cardLayout.show(gameFrame, textBoxArray.get(currentBox).id);
         } else if (e.getKeyCode() == KeyEvent.VK_UP || e.getKeyCode() == KeyEvent.VK_W) {
-            // sleep to prevent excessively fast scrolling
-            try {
-                Thread.sleep(100);
-            } catch (InterruptedException ex) {
-                ex.printStackTrace();
-            }
             currentBox = (currentBox + 1) % textBoxArray.size();
         } else if (e.getKeyCode() == KeyEvent.VK_UP || e.getKeyCode() == KeyEvent.VK_W) {
-            try {
-                Thread.sleep(100);
-            } catch (InterruptedException ex) {
-                ex.printStackTrace();
-            }
             // if currentBox > 0, subtract one
             // else, set to TOTAL_BOXES-1
             currentBox = currentBox > 0 ? currentBox - 1:textBoxArray.size() - 1;
         } else if (e.getKeyCode() == KeyEvent.VK_DOWN || e.getKeyCode() == KeyEvent.VK_S) {
-            try {
-                Thread.sleep(100);
-            } catch (InterruptedException ex) {
-                ex.printStackTrace();
-            }
             // if currentBox > total box amount - 1, set to 0
             // else, set to TOTAL_BOXES-1
             currentBox = currentBox < textBoxArray.size() - 1 ? currentBox + 1:0;