[Refactor] Reworked how OrbitalBehaviour behaves under the hood

Assets/Scripts/GlobalOrbitalManager.cs

@@ -0,0 +1,244 @@
+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+
+public partial class OrbitalBehaviour
+{
+    public class BehaviourManager : MonoBehaviour
+    {
+        private static BehaviourManager Instance;
+        
+        private Vector3[] m_PrecalculatedPositions;
+
+        private bool m_CurrentRingAllowsSpawning;
+        private bool m_IsSimulationRunning;
+        private bool m_AllowPlayerInput;
+
+        public static bool IsSimulationRunning => Instance.m_IsSimulationRunning;
+        public static bool AllowPlayerInput => Instance.m_AllowPlayerInput;
+
+        private float m_LocalDeltaTimeScale = 1f;
+        private float m_TimeOfLastRingSpawn;
+        
+        private int m_LastGeneratedRing;
+
+        private readonly Dictionary<int, float> m_Distances = new();
+        private readonly List<OrbitalBehaviour> m_ObjectInstances = new();
+        private readonly List<Ring> m_Rings = new();
+        
+        private OrbitalBehaviour m_PlayerInstance;
+
+        private GameObject m_RingParent;
+
+        private const int CirclePoints = 100;
+        
+        public static IEnumerator StartPlayerSpeedupModifier()
+        {
+            Instance.m_LocalDeltaTimeScale *= 1.5f;
+
+            yield return new WaitForSeconds(10f);
+
+            Instance.m_LocalDeltaTimeScale /= 1.5f;
+            Instance.m_LocalDeltaTimeScale *= 2f;
+
+            yield return new WaitForSeconds(5f);
+        
+            Instance.m_LocalDeltaTimeScale /= 2f;
+        }
+        
+        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
+        private static void OnApplicationStart()
+        {
+            GameObject manager = new("OrbitalManager");
+            DontDestroyOnLoad(manager);
+            Instance = manager.AddComponent<BehaviourManager>();
+            
+            Instance.PrecalculatePositions();
+            Instance.StartCoroutine(RestartSimulation());
+
+            Instance.m_RingParent = new GameObject("RingHolder");
+        }
+
+        private void PrecalculatePositions()
+        {
+            m_PrecalculatedPositions = new Vector3[CirclePoints];
+            for (int idx = 0; idx < m_PrecalculatedPositions.Length; idx++)
+            {
+                m_PrecalculatedPositions[idx] = new Vector3
+                (
+                    x: Mathf.Cos(Mathf.Deg2Rad * (359f / CirclePoints * idx)),
+                    y: Mathf.Sin(Mathf.Deg2Rad * (359f / CirclePoints * idx)),
+                    z: 0
+                );
+            }
+        }
+
+        public static IEnumerator RestartSimulation()
+        {
+            Instance.m_IsSimulationRunning = false;
+            Instance.m_AllowPlayerInput = false;
+            
+            Instance.m_LocalDeltaTimeScale = 7f;
+
+            for (int idx = 0; idx < 100; idx++) // 100 = 5 seconds of fixed updates
+            {
+                if (Instance.m_PlayerInstance != null)
+                {
+                    Instance.m_PlayerInstance.m_AttachedRing = Instance.m_LastGeneratedRing;
+                }
+
+                yield return new WaitForFixedUpdate();
+            }
+
+            PlayerController.AttachPlayer();
+
+            foreach (OrbitalBehaviour behaviour in Instance.m_ObjectInstances)
+            {
+                behaviour.OnSimulationRestart();
+            }
+
+            yield return new WaitForSeconds(1.3f);
+            
+            Instance.m_IsSimulationRunning = true;
+            Instance.m_AllowPlayerInput = true;
+
+            Instance.m_LocalDeltaTimeScale = 1f;
+        }
+
+        private void SpawnNewRing()
+        {
+            GameObject newRing = Instantiate(Settings.Instance.RingPrefab, m_RingParent.transform);
+            newRing.transform.localScale = new Vector3(12f, 12f, 1f);
+            
+            Ring ring = newRing.AddComponent<Ring>();
+            ring.m_ID = m_LastGeneratedRing + 1;
+            m_Rings.Add(ring);
+            
+            LineRenderer lineRenderer = newRing.GetComponentInChildren<LineRenderer>();
+            lineRenderer.loop = true;
+            lineRenderer.positionCount = CirclePoints;
+            lineRenderer.startWidth = 0.1f;
+            lineRenderer.endWidth = 0.1f;
+            lineRenderer.material = new Material(Shader.Find("Sprites/Default"));
+
+            m_LastGeneratedRing = ring.m_ID;
+            m_TimeOfLastRingSpawn = Time.time;
+
+            m_CurrentRingAllowsSpawning = Random.Range(0, 25) != 0;
+            if (!m_CurrentRingAllowsSpawning && m_AllowPlayerInput)
+            {
+                Instantiate(Settings.Instance.ModifierPrefab);
+            }
+        }
+
+        private void Update()
+        {
+            if (Time.time - m_TimeOfLastRingSpawn > Settings.Instance.GapDistance / m_LocalDeltaTimeScale)
+            {
+                SpawnNewRing();
+            }
+
+            List<Ring> toRemove = new();
+            m_Distances.Clear();
+
+            foreach (Ring ring in m_Rings)
+            {
+                float diff = (m_LocalDeltaTimeScale * Time.deltaTime) * Settings.Instance.DistanceSpeed;
+                ring.transform.localScale -= new Vector3(diff, diff, 0f);
+
+                LineRenderer lineRenderer = ring.GetComponentInChildren<LineRenderer>();
+                for (int vert = 0; vert < CirclePoints; vert++)
+                {
+                    lineRenderer.SetPosition(vert, new Vector3
+                    (
+                        x: m_PrecalculatedPositions[vert].x * ring.transform.localScale.x,
+                        y: m_PrecalculatedPositions[vert].y * ring.transform.localScale.y,
+                        z: 10
+                    ));
+                }
+
+                float lerp = (ring.transform.localScale.x - 0.5f) / 4f;
+                Color c = Color.Lerp(Color.black, Color.white, Mathf.Clamp01(lerp));
+                if (ring.transform.localScale.x < 0.5f)
+                {
+                    if (m_IsSimulationRunning)
+                        PlayerController.s_PlayerScore++;
+                
+                    toRemove.Add(ring);
+                }
+
+                lineRenderer.startColor = c;
+                lineRenderer.endColor = c;
+
+                m_Distances[ring.m_ID] = ring.transform.localScale.x;
+            }
+            
+            foreach (Ring ring in toRemove)
+            {
+                m_Rings.Remove(ring);
+                Destroy(ring.gameObject);
+            }
+
+            foreach (OrbitalBehaviour orbitalPosition in m_ObjectInstances)
+            {
+                if (!orbitalPosition.IsAttachedToRings)
+                    continue;
+
+                if (!m_Distances.TryGetValue(orbitalPosition.m_AttachedRing, out float distance))
+                {
+                    orbitalPosition.m_AttachedRing = m_LastGeneratedRing;
+                    orbitalPosition.OnReachCentre();
+                    continue;
+                }
+
+                orbitalPosition.m_DistanceFromCentre = distance;
+
+                float deltaTime = Time.deltaTime * m_LocalDeltaTimeScale;
+                float movement = deltaTime * Settings.Instance.RadiusSpeed * orbitalPosition.m_SpinSpeed;
+                orbitalPosition.m_DistanceAlongCircumference += movement;
+                orbitalPosition.m_DistanceAlongCircumference %= Mathf.PI * 2;
+                orbitalPosition.transform.position = orbitalPosition.TranslateToVector3();
+            }
+        }
+        
+        private void FixedUpdate()
+        {
+            foreach (OrbitalBehaviour orbital in m_ObjectInstances)
+            {
+                if (orbital == m_PlayerInstance)
+                    continue;
+
+                Vector2 a = orbital.TranslateToVector3();
+                Vector2 b = m_PlayerInstance.TranslateToVector3();
+                float distance = (a - b).magnitude;
+                float radii = orbital.m_ObjectRadius + m_PlayerInstance.m_ObjectRadius;
+                if (distance > radii)
+                    continue;
+                
+                m_PlayerInstance.OnOrbitalCollision(orbital);
+                orbital.OnOrbitalCollision(m_PlayerInstance);
+            }
+
+            if (Random.Range(0, 20) == 0 && m_AllowPlayerInput && m_CurrentRingAllowsSpawning)
+            {
+                Instantiate(Settings.Instance.EnemyPrefab);
+            }
+        }
+
+        public static void UnregisterOrbitalInstance(OrbitalBehaviour instance)
+        {
+            Instance.m_ObjectInstances.Remove(instance);
+        }
+        
+        public static void RegisterOrbitalInstance(OrbitalBehaviour instance)
+        {
+            instance.m_AttachedRing = Instance.m_LastGeneratedRing; // Connects it to last generated ring
+            Instance.m_ObjectInstances.Add(instance);
+        }
+
+        public static void SetPlayer(OrbitalBehaviour player)
+        {
+            Instance.m_PlayerInstance = player;
+        }
+    }
+}