How can I rotate a sprite in Unity 4.3?

Question

I would like to rotate the sprite onto the stage by pressing the left or right arrow keys (think of a spaceship in asteroids).

I placed the sprite on the scene and created a script, but I'm not really sure where to go from there.

My current script is as follows:

using UnityEngine; using System.Collections; public class RotateLeftRight : MonoBehaviour { public float speed = 1.0f; public string axisName = "Horizontal"; // Use this for initialization void Start () { } // Update is called once per frame void Update () { if(Input.GetKeyDown(KeyCode.LeftArrow)) { // left transform.Rotate(-1.0f, 0.0f, 0.0f); // does nothing, just a bad guess } if(Input.GetKeyDown(KeyCode.RightArrow)) { // right transform.Rotate(1.0f, 0.0f, 0.0f); // does nothing, just a bad guess } } } 

I just coded above, not knowing what would happen (and, surprisingly, nothing happens at all).

Any advice on how to rotate the sprite and control the speed of rotation is welcome.

Answer 1

I can’t try it with Unity right now, but I assume that it either rotates only 1º, so you cannot notice it or rotate 360º, and therefore it really remains the same.

Try to solve your problem:

• Instead of transform.Rotate try transform.Translate(20f, 20f, 20f) just to make sure it recognizes the input;
• Use a different value instead of 1.0f , for example 0.1f and 30.0f (I think 30.0f will be 30º, but I'm not sure);
• Try changing the rotation on other y and z axes instead of x ;
• Use the alternative definition of Rotate(Vector3 axis, float angle) .

Hope this helps!

Answer 2

@Sailing Judo, here is the best answer if you want to turn it like a wheel. Try to look at your code again and instead of putting / changing the X axis as a parameter, instead put your value on the Z axis. Changing the x or y axis in a circular rotation ended like a coin flipping. Watch and try again.

  if(Input.GetKey(KeyCode.LeftArrow)) { // Clockwise transform.Rotate(0, 0, -3.0f); // --> Instead of "transform.Rotate(-1.0f, 0.0f, 0.0f);" } if(Input.GetKey(KeyCode.RightArrow)) { // Counter-clockwise transform.Rotate(0, 0, 3.0f); // --> Instead of transform.Rotate(1.0f, 0.0f, 0.0f); }