added UI with inventory and some notifications and an end screen + timer

src/de/miaurizius/jgame2d/core/GamePanel.java

@@ -30,10 +30,12 @@ public class GamePanel extends JPanel implements Runnable {
     // SYSTEM
     TileManager tileM = new TileManager(this);
     KeyHandler keyH = new KeyHandler();
-    Sound sound = new Sound();
-    Thread gameThread;
+    Sound se = new Sound();
+    Sound music = new Sound();
     public CollisionHandler collisionH = new CollisionHandler(this);
-    public AssetSetter assetSetter = new AssetSetter(this);;
+    public AssetSetter assetSetter = new AssetSetter(this);
+    public UI ui = new UI(this);
+    Thread gameThread;
 
     // ENTITY AND OBJECT
     public Player player = new Player(this, keyH);
@@ -98,22 +100,23 @@ public class GamePanel extends JPanel implements Runnable {
         tileM.draw(graphics2d);
         for (SuperObject superObject : obj) if (superObject != null) superObject.draw(graphics2d, this);
         player.draw(graphics2d);
+        ui.draw(graphics2d);
         graphics.dispose();
     }
 
     public void playMusic(int i) {
-        sound.setFile(i);
-        sound.play();
-        sound.loop();
+        music.setFile(i);
+        music.play();
+        music.loop();
     }
 
     public void stopMusic() {
-        sound.stop();
+        music.stop();
     }
 
     public void playSE(int i) {
-        sound.setFile(i);
-        sound.play();
+        se.setFile(i);
+        se.play();
     }
 
 }

src/de/miaurizius/jgame2d/core/UI.java

@@ -0,0 +1,83 @@
+package de.miaurizius.jgame2d.core;
+
+import de.miaurizius.jgame2d.object.KeyObj;
+
+import java.awt.*;
+import java.awt.image.BufferedImage;
+import java.text.DecimalFormat;
+
+public class UI {
+
+    GamePanel panel;
+    Font arial_40, arial_80B;
+    BufferedImage keyImage;
+    public boolean messageOn = false;
+    public String message;
+    int msgC = 0;
+    public boolean gameFinished = false;
+
+    double playTime;
+    DecimalFormat df = new DecimalFormat("#0.00");
+
+    public UI(GamePanel panel) {
+        this.panel = panel;
+        arial_40 = new Font("Arial", Font.PLAIN, 40);
+        arial_80B = new Font("Arial", Font.BOLD, 80);
+        keyImage = new KeyObj().image;
+    }
+
+    public void showMessage(String text) {
+        message = text;
+        messageOn = true;
+    }
+
+    public void draw(Graphics graphics2d) {
+        if(gameFinished) {
+            graphics2d.setFont(arial_40);
+            graphics2d.setColor(Color.white);
+            String text = "You found the treasure!";
+            int textLength = (int) graphics2d.getFontMetrics().getStringBounds(text, graphics2d).getWidth();
+            int x,y;
+            x = panel.screenWidth/2 - textLength/2;
+            y = panel.screenHeight/2 - (panel.tileSize*3);
+            graphics2d.drawString(text, x, y);
+
+            text = "Your time is: " + df.format(playTime) + "!";
+            textLength = (int) graphics2d.getFontMetrics().getStringBounds(text, graphics2d).getWidth();
+            x = panel.screenWidth/2 - textLength/2;
+            y = panel.screenHeight/2 + (panel.tileSize*4);
+            graphics2d.drawString(text, x, y);
+
+            graphics2d.setFont(arial_80B);
+            graphics2d.setColor(Color.yellow);
+            text = "Congratulations!";
+            textLength = (int) graphics2d.getFontMetrics().getStringBounds(text, graphics2d).getWidth();
+            x = panel.screenWidth/2 - textLength/2;
+            y = panel.screenHeight/2 + (panel.tileSize*2);
+            graphics2d.drawString(text, x, y);
+
+            panel.gameThread = null;
+            return;
+        }
+
+        // MESSAGE
+        graphics2d.setFont(arial_40);
+        graphics2d.setColor(Color.white);
+        graphics2d.drawImage(keyImage, panel.tileSize/2, panel.tileSize/2, panel.tileSize,  panel.tileSize, null);
+        graphics2d.drawString("x " + panel.player.hasKey, 74, 65);
+
+        // TIME
+        playTime += (double) 1/panel.FPS;
+        graphics2d.drawString("Time: " + df.format(playTime), panel.tileSize*11, 65);
+
+        if(messageOn) {
+            graphics2d.setFont(panel.getFont().deriveFont(30F));
+            graphics2d.drawString(message, panel.tileSize/2, panel.tileSize*5);
+            msgC++;
+            if(msgC <= 120) return; //text stays 2 seconds
+            msgC = 0;
+            messageOn = false;
+        }
+    }
+
+}

src/de/miaurizius/jgame2d/entity/Player.java

@@ -16,7 +16,7 @@ public class Player extends Entity {
 
     public final int screenX;
     public final int screenY;
-    int hasKey = 0;
+    public int hasKey = 0;
 
     public Player(GamePanel panel, KeyHandler keyH) {
         this.panel = panel;
@@ -98,18 +98,27 @@ public class Player extends Entity {
                 panel.playSE(1);
                 hasKey++;
                 panel.obj[index] = null;
+                panel.ui.showMessage("You got a key!");
                 break;
             case "door":
                 if(hasKey > 0) {
                     panel.playSE(3);
                     panel.obj[index] = null;
                     hasKey--;
+                    panel.ui.showMessage("You opened the door!");
                 }
+                else panel.ui.showMessage("You need a key!");
                 break;
             case "boots":
                 panel.playSE(2);
                 speed += 1;
                 panel.obj[index] = null;
+                panel.ui.showMessage("Speed up!");
+                break;
+            case "chest":
+                panel.ui.gameFinished = true;
+                panel.stopMusic();
+                panel.playSE(4);
                 break;
         }
     }