2D Rotate Object With Clamp Gradually. (C#)

Questions & Answers
1

Hello all, I’ve been looking all over Unity Answers for the answer to this but can’t seem to find it, and the ones I do find don’t seem to work or I just can’t get my head around them.

So my problem is that I want to have my 2D character rotate left and right on the z axis when I move them up and down, but I need it to happen gradually over time, so it’s not instant.

I also need my player to gradually revert back to looking straight ahead when the player isn’t pressing any keys. I’ve tried this with else and else if statements but have had no luck.

Also tried a float with acceleration variable * Time.deltaTime but that didn’t work out either.

Here is what I have so far:

using UnityEngine;
using System.Collections;

public class PlayerControl : MonoBehaviour {

	public float horizontalSpeed = 9.0f;
	public float horizontalDownSpeed = 3.0f;
	public float gravitySpeed = 3.0f;
	public float rotationSpeed = 20f;
	
	void Update() {
		if (Input.GetKey (KeyCode.UpArrow)) {
						transform.position += Vector3.up * horizontalSpeed * Time.deltaTime;

						rotationSpeed = Mathf.Clamp (rotationSpeed, 30, 30);
						transform.localEulerAngles = new Vector3 (transform.localEulerAngles.x, transform.localEulerAngles.y, rotationSpeed);

				} else if (Input.GetKey (KeyCode.DownArrow)) {
						transform.position += Vector3.down * horizontalDownSpeed * Time.deltaTime;

						rotationSpeed = Mathf.Clamp (rotationSpeed, -30, 30);
						transform.localEulerAngles = new Vector3 (transform.localEulerAngles.x, transform.localEulerAngles.y, -rotationSpeed);

		}

		transform.position += Vector3.down * gravitySpeed * Time.deltaTime;
	
	}
}

Any help is greatly appreciated! Thanks!

2

I have written very similar code before for having my planes rotate side-side when the player moves. This should get you going.

public class PlayerMove : MonoBehaviour {

	public float maxMove=0.1f; // speed of the movement of the object
	public float maxTurn=30;   // max angle it turns up/down
	public float turnRate=10;  // how quickly it turns up/down
	Rigidbody2D rb2d;

	// Use this for initialization
	void Start () {
		rb2d = GetComponent<Rigidbody2D> ();
	}
	
	// Update is called once per frame
	void Update () {
		float delta = Input.GetAxis ("Vertical");

		rb2d.MovePosition (rb2d.position + Vector2.up * delta * maxMove * Time.deltaTime);
		// simply set the angle
		//rb2d.rotation = turnAngle * delta;
		// use Lerp to set the angle
		rb2d.rotation = Mathf.Lerp (rb2d.rotation, maxTurn * delta, turnRate*Time.deltaTime);
		// you could use SmoothStep/SmoothDamp as well 
	}
}
3

I think I had almost this exact problem yesterday! Hopefully my solution is of help to you.

I generate a Vector3 bodyLook which points in the direction I want my character to face (derived from joypad stick input). myBody is the actual GameObject of the entity I want to rotate. Then I use the following code to generate the rotation:

float a = Vector3.Angle(bodyLook, myBody.transform.forward );
float r = Vector3.Angle(bodyLook, myBody.transform.right);
float l = Vector3.Angle(bodyLook, myBody.transform.forward - myBody.transform.right );

if (a>0) {
  float rate = a/turnDrag;
  if (l>r) {
    myBody.transform.Rotate (new Vector3(0f,rate,0f));
  }else {
    myBody.transform.Rotate (new Vector3(0f,-rate,0f));
  }
}

turnDrag is a float that specifies an amount of drag on the rotation (think I find 10f works quite well, bigger = slower)

This works for me, hopefully this is of some help/use, really need to check that a is bigger than something other than 0, perhaps 0.1, otherwise you get a bit of a wobble when you get to your desired angle.