HoHCI-BikeSim/Assets/Scripts/Animation/BikeAnimation.cs

using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Serialization;

public class BikeAnimation : MonoBehaviour
{
    #region Variables

    [Header("Wheels - rotating around center")]
    public GameObject rearWheel;

    public GameObject frontWheel;

   [Header("Other with defined rotation axis")]
    public Rotatable crankSet;

    public Rotatable fork;

    [Header("Parameters")] public float wheelCircumference = 2.096f;
    public float defaultCadence = 80;

    private BicycleController bicycleController;

    private readonly Dictionary<Rotatable, Vector3> initialPositions = new Dictionary<Rotatable, Vector3>();
    private readonly Dictionary<Rotatable, Quaternion> initialRotations = new Dictionary<Rotatable, Quaternion>();

    #endregion


    // Start is called before the first frame update
    void Start()
    {
        bicycleController = GetComponentInParent<BicycleController>();
        initialPositions[crankSet] = crankSet.gameObject.transform.localPosition;
        initialPositions[fork] = fork.gameObject.transform.localPosition;
        initialRotations[crankSet] = crankSet.gameObject.transform.localRotation;
        initialRotations[fork] = fork.gameObject.transform.localRotation;
    }

    void Update()
    {
        var cadence = BikeSensorData.Instance.PowermeterData?.InstantaneousCadence ?? defaultCadence; //rpm
        var cadenceAngle = cadence / 60 * 360 * Time.deltaTime; //rps * 360 deg for one round

        RotateWheels();
        RotateAroundDefinedAxis(fork, bicycleController.CurrentSteerAngle);
        RotateAroundDefinedAxis(crankSet, cadenceAngle, false);
    }

    private void RotateWheels()
    {
        var speed = bicycleController.rigidBody.velocity.magnitude;
        var rps = speed / wheelCircumference;
        var angle = rps * Time.deltaTime;
        
        //TODO: only works for this specific model
        rearWheel.transform.RotateAround(rearWheel.transform.position, -rearWheel.transform.right, angle);
        frontWheel.transform.RotateAround(frontWheel.transform.position, -frontWheel.transform.right, angle);
    }

    private void RotateAroundDefinedAxis(Rotatable rotatable, float angle, bool resetBeforeRotate = true)
    {
        if (resetBeforeRotate)
        {
            rotatable.gameObject.transform.localPosition = initialPositions[rotatable];
            rotatable.gameObject.transform.localRotation = initialRotations[rotatable];
        }

        Vector3 axis;
        if (rotatable.rotateAxis == RotateAxis.Up)
            axis = rotatable.rotateAround.up;
        else if (rotatable.rotateAxis == RotateAxis.Forward)
            axis = rotatable.rotateAround.forward;
        else
            axis = rotatable.rotateAround.right;

        fork.gameObject.transform.RotateAround(rotatable.rotateAround.position, axis, angle);
    }


    //rotates the meshes
    void RotateObject(GameObject obj, float multiplier)
    {
        obj.transform.Rotate(
            Time.deltaTime * bicycleController.rigidBody.velocity.magnitude * (360f / 12f) * multiplier, 0,
            0);
        //obj.transform.Rotate(Time.deltaTime * rotSpeed * (360f / oneRotationSpeed) * multiplier, 0, 0);
    }
}