5 difficulty levels added for issue #96

src/main/java/com/dinosaur/dinosaurexploder/model/Difficulty.java

@@ -0,0 +1,27 @@
+package com.dinosaur.dinosaurexploder.model;
+
+import java.util.Random;
+
+public class Difficulty {
+    private final double speed;
+    private final double minAngleOffset;
+    private final double maxAngleOffset;
+    private final Random random = new Random();
+
+    public Difficulty(double speed, double min, double max) {
+        assert max > min;
+        this.speed = speed;
+        this.minAngleOffset = min;
+        this.maxAngleOffset = max;
+    }
+    public double getSpeed() {
+        return speed;
+    }
+
+    public double getAngleOffset() {
+        if (minAngleOffset == maxAngleOffset) {
+            return minAngleOffset;
+        }
+        return minAngleOffset + (maxAngleOffset - minAngleOffset) * random.nextDouble();
+    }
+}

src/main/java/com/dinosaur/dinosaurexploder/model/GameSettings.java

@@ -0,0 +1,69 @@
+package com.dinosaur.dinosaurexploder.model;
+
+public class GameSettings {
+    // Declare private static instance of the class
+    private static GameSettings instance;
+
+    // Global variables
+    private int difficultyLevel;
+    private Difficulty difficulty;
+
+    // Private constructor to prevent instantiation from other classes
+    private GameSettings() {
+        difficultyLevel = 1;
+        difficulty = createDifficulty();
+    }
+
+    private Difficulty createDifficulty() {
+        double speed, min, max;
+        switch (difficultyLevel) {
+            case 1:
+                speed = 1.0;
+                min = 90;
+                max = 90;
+                break;
+            case 2:
+                speed = 2.0;
+                min = 90;
+                max = 90;
+                break;
+            case 3:
+                speed = 2.5;
+                min = 90;
+                max = 90;
+                break;
+            case 4:
+                speed = 2.5;
+                min = 22.5;
+                max = 112.5;
+                break;
+            case 5:
+                speed = 3.0;
+                min = 45;
+                max = 135;
+                break;
+            default:
+                throw new IllegalArgumentException("Unknown difficulty level!");
+        }
+        return new Difficulty(speed, min, max);
+    }
+
+    // Public static method to provide access to the instance
+    public static GameSettings getInstance() {
+        if (instance == null) {
+            instance = new GameSettings();
+        }
+        return instance;
+    }
+
+    // Getters and setters for the global variables
+
+    public Difficulty getDifficulty() {
+        return difficulty;
+    }
+
+    public void setDifficultyLevel(int level) {
+        this.difficultyLevel = level;
+        difficulty = createDifficulty();
+    }
+}

src/main/java/com/dinosaur/dinosaurexploder/model/GreenDinoComponent.java

@@ -14,8 +14,8 @@
  *      This class extends Component and Implements the Dinosaur Classes and Handles the Shooting and Updating the Dino
  */
 public class GreenDinoComponent extends Component implements Dinosaur{
-    double verticalSpeed = 1.5;
-    private LocalTimer timer = FXGL.newLocalTimer();
+    public Difficulty difficulty = GameSettings.getInstance().getDifficulty();
+    private final LocalTimer timer = FXGL.newLocalTimer();
     /**
      * Summary :
      *      This method runs for every frame like a continues flow , without any stop until we put stop to it.
@@ -24,7 +24,7 @@ public class GreenDinoComponent extends Component implements Dinosaur{
      */
     @Override
     public void onUpdate(double ptf) {
-        entity.translateY(verticalSpeed);
+        entity.translateY(difficulty.getSpeed());
 
         //The dinosaur shoots every 2 seconds
         if (timer.elapsed(Duration.seconds(1.5)) && entity.getPosition().getY() > 0)
@@ -41,9 +41,9 @@ public void onUpdate(double ptf) {
     public void shoot() {
         FXGL.play(GameConstants.ENEMYSHOOT_SOUND);
         Point2D center = entity.getCenter();
-        Vec2 direction = Vec2.fromAngle(entity.getRotation() +90);
+        Vec2 direction = Vec2.fromAngle(entity.getRotation() + difficulty.getAngleOffset());
         spawn("basicEnemyProjectile",
-                new SpawnData(center.getX() + 50 +3, center.getY())
+                new SpawnData(center.getX(), center.getY())
                         .put("direction", direction.toPoint2D() )
         );
     }

src/main/java/com/dinosaur/dinosaurexploder/model/LifeComponent.java

@@ -39,7 +39,7 @@ public void onUpdate(double ptf)
         lifeText.setFill(Color.RED);
         lifeText.setFont(Font.font(GameConstants.ARCADECLASSIC_FONTNAME, 20));
 
-        // Adjusting Hearts with respect to text and eachother
+        // Adjusting Hearts with respect to text and each other
         test1.setLayoutY(10);
         test2.setLayoutY(10);
         test3.setLayoutY(10);