Smoothly increase rotation speed when pressing a key

Questions & Answers
1

Hi,

I’m fairly new to unity and C#, so forgive me for this noob question.

I’m making a funfair ride, and I want to increase the rotation of an object when someone presses a key, for example “W” and “S”
The code that I created now is simple, it goes to the speed I set, but it doesn’t smoothly increase overtime while pressing the key.

Can someone help me with it?

Thanks!!

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

public class Kruis : MonoBehaviour
{
  

    void Start()
    {

    }

    void Update()
    {
        if (Input.GetKey("w")) transform.RotateAround(transform.position, transform.up, Time.deltaTime * 210f);
        if (Input.GetKey("s")) transform.RotateAround(transform.position, transform.up, Time.deltaTime * 0f);

    }

}
2

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

public class Kruis : MonoBehaviour
{
    public float RotationSpeed = 1;
    public float RotationAcceleration = 1;
    public float MaxRotationSpeed = 50;
    public KeyCode AccelerationKey = KeyCode.W;
    public KeyCode DecelerationKey = KeyCode.S;
    public Vector3 RotationAxis = Vector3.up;
    public bool RotateAroundWorldAxis;
    public bool RotateAntiClockWise;
    private float currentRotationSpeed;

    void Start()
    {
        currentRotationSpeed = RotationSpeed;
    }

    void Update()
    {
        if (Input.GetKey(AccelerationKey))
        {
            currentRotationSpeed += Time.deltaTime * RotationAcceleration;
        }
        if (Input.GetKey(DecelerationKey))
        {
            currentRotationSpeed -= Time.deltaTime * RotationAcceleration;
        }

        currentRotationSpeed = Mathf.Clamp(currentRotationSpeed, 0, MaxRotationSpeed);

        float angle = currentRotationSpeed;
        if (RotateAntiClockWise)
            angle = -angle;

        Vector3 rotationAxis = RotationAxis;
        if (!RotateAroundWorldAxis)
            rotationAxis = transform.rotation * RotationAxis;
        transform.RotateAround(transform.position, rotationAxis, angle);
    }

#if UNITY_EDITOR
    private void OnDrawGizmosSelected()
    {
        Quaternion rotation       = RotateAroundWorldAxis ? Quaternion.identity : transform.rotation;
        Vector3 rotationAxis      = rotation * RotationAxis;
        float angle               = RotateAntiClockWise ? 1/2f : 1;
        float radius              = 0.5f;
        Color gizmosColor         = Color.magenta;
        Color handlesColor        = UnityEditor.Handles.color;
        Vector3 arrowCap          = transform.position + rotationAxis + transform.rotation * new Vector3(Mathf.Cos(angle * Mathf.PI), 0, Mathf.Sin(angle * Mathf.PI)) * radius;
        Vector3 leftArrowEnd      = arrowCap + Quaternion.Euler(0, RotateAntiClockWise ? 0 : 90, 0) * rotation * new Vector3(0.1f, 0, 0.1f) ;
        Vector3 rightArrowEnd     = arrowCap + Quaternion.Euler(0, RotateAntiClockWise ? 0 : 90, 0) * rotation * new Vector3(0.1f, 0, -0.1f);
        UnityEditor.Handles.color = gizmosColor;
        Debug.DrawLine(transform.position - rotationAxis, transform.position + rotationAxis, gizmosColor);
        UnityEditor.Handles.DrawWireArc(transform.position + rotationAxis, rotationAxis, transform.forward, 270, radius);
        Debug.DrawLine(arrowCap, leftArrowEnd, gizmosColor);
        Debug.DrawLine(arrowCap, rightArrowEnd, gizmosColor);
        UnityEditor.Handles.color = handlesColor;
    }
#endif
}

ORIGINAL ANSWER

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

public class Kruis : MonoBehaviour
{
    public float RotationSpeed = 1;
    public float RotationAcceleration = 1;
    private float currentRotationSpeed;

    void Start()
    {
        currentRotationSpeed = RotationSpeed;
    }

    void Update()
    {
        if (Input.GetKeyDown("w") || Input.GetKeyDown("s"))
        {
            currentRotationSpeed = RotationSpeed;
        }
        if (Input.GetKey("w"))
        {
            transform.RotateAround(transform.position, transform.up, currentRotationSpeed);
            currentRotationSpeed += Time.deltaTime * RotationAcceleration;
        }
        if (Input.GetKey("s"))
        {
            transform.RotateAround(transform.position, transform.up, currentRotationSpeed);
            currentRotationSpeed += Time.deltaTime * RotationAcceleration;
        }
    }
}