Graveyard terrain and background tiles implemented

js/effects/FullscreenEffect.js

@@ -11,6 +11,10 @@ export class FullscreenEffect
 	{
 	}
 
+	destroy()
+	{
+	}
+
 	update(timestamp)
 	{	
 	}

js/effects/RainEffect.js

@@ -48,4 +48,12 @@ export class RainEffect extends FullscreenEffect
 			}
 		}
 	}
+
+	destroy()
+	{
+		super.destroy();
+
+		this.sound.pause();
+		this.sound.remove();
+	}
 }

js/effects/SnowEffect.js

@@ -48,4 +48,12 @@ export class SnowEffect extends FullscreenEffect
 			}
 		}
 	}
+
+	destroy()
+	{
+		super.destroy();
+
+		this.audio.pause();
+		this.audio.remove();
+	}
 }

js/effects/ThunderstormEffect.js

@@ -18,6 +18,7 @@ export class ThunderstormEffect extends FullscreenEffect
 			new Audio('js/effects/thunder04.mp3'),
 		];
 		this.currentSound = 0;
+		this.isActive = true;
 	}
 
 	shuffleSounds(iterations = 10)
@@ -60,6 +61,10 @@ export class ThunderstormEffect extends FullscreenEffect
 
 			setTimeout(
 				() => {
+					if (!this.isActive) {
+						return;
+					}
+
 					if (this.currentSound === 0) {
 						this.shuffleSounds();
 					}
@@ -85,4 +90,14 @@ export class ThunderstormEffect extends FullscreenEffect
 		context.fillStyle = 'rgba(255, 255, 255, ' + this.currentAlpha + ')';
 		context.fillRect(0, 0, context.canvas.width, context.canvas.height);
 	}
+
+	destroy()
+	{
+		this.isActive = false;
+
+		for (const sound of this.sounds) {
+			sound.pause();
+			sound.remove();
+		}
+	}
 }