82 lines
2.9 KiB
C#
82 lines
2.9 KiB
C#
using System;
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using Syntriax.Engine.Core;
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using Syntriax.Engine.Physics2D;
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using Syntriax.Engine.Physics2D.Abstract;
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namespace Pong.Behaviours;
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public class BallBehaviour : BehaviourOverride
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{
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public Vector2D StartDirection { get; private set; } = Vector2D.Zero;
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public float Speed { get; set; } = 500f;
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public float SpeedUpMultiplier { get; set; } = .0125f;
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private readonly Random random = new();
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private IRigidBody2D rigidBody = null!;
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protected override void OnFirstActiveFrame()
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{
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if (!BehaviourController.TryGetBehaviour(out IRigidBody2D? foundRigidBody))
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throw new Exception($"{nameof(IRigidBody2D)} is missing on {GameObject.Name}.");
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if (!BehaviourController.TryGetBehaviour(out ICollider2D? foundCollider))
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throw new Exception($"{nameof(ICollider2D)} is missing on {GameObject.Name}.");
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foundCollider.OnCollisionDetected += OnCollisionDetected;
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rigidBody = foundRigidBody;
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if (GameObject.GameManager.TryFindBehaviour(out PongManagerBehaviour? pongManager))
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{
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pongManager.OnReset += ResetBall;
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pongManager.OnScored += ResetBall;
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pongManager.OnFinished += DisableBall;
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}
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}
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private void DisableBall(PongManagerBehaviour pongManager)
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{
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BehaviourController.GameObject.Transform.Position = Vector2D.Zero;
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rigidBody.Velocity = Vector2D.Zero;
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}
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private void ResetBall(PongManagerBehaviour pongManager)
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{
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StateEnable.Enabled = true;
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BehaviourController.GameObject.Transform.Position = Vector2D.Zero;
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rigidBody.Velocity = GetRandomDirection() * Speed;
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}
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private Vector2D GetRandomDirection()
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{
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const float AllowedRadians = 45f * Syntriax.Engine.Core.Math.DegreeToRadian;
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float rotation = (float)random.NextDouble() * 2f * AllowedRadians - AllowedRadians;
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bool isBackwards = (random.Next() % 2) == 1;
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return Vector2D.Right.Rotate(isBackwards ? rotation + Syntriax.Engine.Core.Math.PI : rotation);
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}
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protected override void OnUpdate()
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{
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if (rigidBody.Velocity.MagnitudeSquared <= 0.01f)
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return;
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Vector2D speedUp = rigidBody.Velocity.Normalized * Time.DeltaTimeFrame;
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rigidBody.Velocity += speedUp * SpeedUpMultiplier;
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}
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private void OnCollisionDetected(ICollider2D collider2D, CollisionDetectionInformation information)
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{
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if (Syntriax.Engine.Core.Math.Abs(information.Normal.Dot(Vector2D.Right)) > .25)
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rigidBody.Velocity = information.Left.Transform.Position.FromTo(information.Right.Transform.Position).Normalized * rigidBody.Velocity.Magnitude;
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else
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rigidBody.Velocity = rigidBody.Velocity.Reflect(information.Normal);
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}
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public BallBehaviour() { }
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public BallBehaviour(Vector2D startDirection, float speed)
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{
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StartDirection = Vector2D.Normalize(startDirection);
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Speed = speed;
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}
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}
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