feature: add mute and umute button, and functionality to mute during rounds

core/src/main/java/group07/beatbattle/ecs/systems/AudioSystem.java

@@ -9,6 +9,7 @@
 public class AudioSystem extends EntitySystem {
     private static AudioSystem instance;
     private AudioPlayer audioPlayer;
+    private boolean muted = false;
 
     private AudioSystem() {}
 
@@ -42,9 +43,14 @@ public void stop(Entity round) {
     }
 
     public void setMuted(boolean muted) {
+        this.muted = muted;
         if (audioPlayer != null) audioPlayer.setMuted(muted);
     }
 
+    public boolean isMuted() {
+        return muted;
+    }
+
     public void dispose() {
         if (audioPlayer != null) audioPlayer.dispose();
     }

core/src/main/java/group07/beatbattle/view/GameRoundView.java

@@ -22,6 +22,7 @@
 import group07.beatbattle.BeatBattle;
 import group07.beatbattle.controller.RoundController;
 import group07.beatbattle.ecs.Engine;
+import group07.beatbattle.ecs.systems.AudioSystem;
 import group07.beatbattle.i18n.Strings;
 import group07.beatbattle.model.Question;
 
@@ -53,11 +54,16 @@ public class GameRoundView extends ScreenAdapter {
     private boolean revealed = false;
     private float resultDelay = RESULT_DISPLAY_DELAY;
 
+    private boolean muted = false;
+    private TextButton muteButton;
+
     private Texture defaultTex;
     private Texture selectedTex;
     private Texture disabledTex;
     private Texture correctTex;
     private Texture wrongTex;
+    private Texture iconSoundTex;
+    private Texture iconMuteTex;
     private Texture logoTexture;
 
     public GameRoundView(BeatBattle game, RoundController controller) {
@@ -72,6 +78,8 @@ public GameRoundView(BeatBattle game, RoundController controller) {
         disabledTex = solidTexture(COLOR_DISABLED);
         correctTex  = solidTexture(COLOR_CORRECT);
         wrongTex    = solidTexture(COLOR_WRONG);
+        iconSoundTex = createSpeakerTexture(false);
+        iconMuteTex  = createSpeakerTexture(true);
 
         logoTexture = new Texture(Gdx.files.internal("logo.png"));
         Image bgLogo = new Image(logoTexture);
@@ -101,9 +109,22 @@ public void changed(ChangeEvent event, Actor actor) {
         timerLabel = new Label(String.valueOf((int) Math.ceil(controller.getTotalTime())), timerStyle());
         timerLabel.setAlignment(Align.center);
 
+        muted = AudioSystem.getInstance().isMuted();
+        muteButton = makeButton("", muted ? iconMuteTex : iconSoundTex);
+        muteButton.addListener(new ChangeListener() {
+            @Override
+            public void changed(ChangeEvent event, Actor actor) {
+                muted = !muted;
+                AudioSystem.getInstance().setMuted(muted);
+                Texture tex = muted ? iconMuteTex : iconSoundTex;
+                muteButton.getStyle().up   = new TextureRegionDrawable(new TextureRegion(tex));
+                muteButton.getStyle().down = new TextureRegionDrawable(new TextureRegion(tex));
+            }
+        });
+
         topBar.add(leaveButton).width(120f).height(100f).padLeft(40f);
         topBar.add(timerLabel).expandX().center().padTop(60f);
-        topBar.add().width(120f).padRight(40f); // Spacer
+        topBar.add(muteButton).width(120f).height(100f).padRight(40f);
 
         root.add(topBar).fillX().row();
 
@@ -197,6 +218,8 @@ public void dispose() {
         disabledTex.dispose();
         correctTex.dispose();
         wrongTex.dispose();
+        iconSoundTex.dispose();
+        iconMuteTex.dispose();
         logoTexture.dispose();
     }
 
@@ -232,6 +255,65 @@ private Label.LabelStyle timerStyle() {
         return style;
     }
 
+    private Texture createSpeakerTexture(boolean muted) {
+        int S = 128;
+        Pixmap pm = new Pixmap(S, S, Pixmap.Format.RGBA8888);
+
+        // Background
+        pm.setColor(muted ? new Color(0.45f, 0.15f, 0.15f, 1f) : new Color(0.23f, 0.23f, 0.34f, 1f));
+        pm.fill();
+
+        pm.setColor(Color.WHITE);
+
+        // Speaker body (rectangle)
+        pm.fillRectangle(18, 46, 20, 36);
+
+        // Speaker horn (trapezoid): narrow at x=38, wide at x=70
+        // top diagonal: (38,46) -> (70,18); bottom diagonal: (38,82) -> (70,110)
+        for (int y = 18; y <= 110; y++) {
+            int leftX;
+            if (y <= 46) {
+                leftX = Math.round(70 - 32f * (y - 18) / 28f);
+            } else if (y <= 82) {
+                leftX = 38;
+            } else {
+                leftX = Math.round(38 + 32f * (y - 82) / 28f);
+            }
+            if (leftX <= 70) pm.drawLine(leftX, y, 70, y);
+        }
+
+        if (!muted) {
+            // Sound arcs (two concentric arcs opening to the right)
+            int cx = 58, cy = 64;
+            for (int r = 14; r <= 18; r++) {
+                for (int angle = -55; angle <= 55; angle++) {
+                    double rad = Math.toRadians(angle);
+                    int x = cx + (int) (r * Math.cos(rad));
+                    int y = cy + (int) (r * Math.sin(rad));
+                    if (x >= 0 && x < S && y >= 0 && y < S) pm.drawPixel(x, y);
+                }
+            }
+            for (int r = 26; r <= 30; r++) {
+                for (int angle = -65; angle <= 65; angle++) {
+                    double rad = Math.toRadians(angle);
+                    int x = cx + (int) (r * Math.cos(rad));
+                    int y = cy + (int) (r * Math.sin(rad));
+                    if (x >= 0 && x < S && y >= 0 && y < S) pm.drawPixel(x, y);
+                }
+            }
+        } else {
+            // Mute slash line (top-right to bottom-left through speaker area)
+            pm.setColor(new Color(1f, 0.6f, 0.6f, 1f));
+            for (int t = -3; t <= 3; t++) {
+                pm.drawLine(92 + t, 20, 20 + t, 108);
+            }
+        }
+
+        Texture tex = new Texture(pm);
+        pm.dispose();
+        return tex;
+    }
+
     private Texture solidTexture(Color color) {
         Pixmap pixmap = new Pixmap(1, 1, Pixmap.Format.RGBA8888);
         pixmap.setColor(color);