Issue with limiting the rotation of an object on Z-Axis
Hi
I'm pretty new to unity and i use it in a special way of creating a non-game2D application So i work only with UI element. I'm having some issues with something i want to do . I have an object which rotate following the finger (or mouse) but the object must not get out of the "area" Here is my code for now :
using UnityEngine;
using System.Collections;
public class SteeringWheel : MonoBehaviour
{
public float angleMax = 90.0f;
private float baseAngle = 0.0f;
void OnMouseDown()
{
Vector3 pos = Camera.main.WorldToScreenPoint(transform.position);
pos = Input.mousePosition - pos;
baseAngle = Mathf.Atan2(pos.y, pos.x) * Mathf.Rad2Deg;
baseAngle -= Mathf.Atan2(transform.right.y, transform.right.x) * Mathf.Rad2Deg;
}
void OnMouseDrag()
{
Vector3 pos = Camera.main.WorldToScreenPoint(transform.position);
pos = Input.mousePosition - pos;
float ang = Mathf.Atan2(pos.y, pos.x) * Mathf.Rad2Deg - baseAngle;
Debug.Log("ang1 : " + ang);
ang = Mathf.Clamp(ang, -90, 90);
if (transform.eulerAngles.z >= 89 && transform.eulerAngles.z <= 271)
{
transform.rotation = new Quaternion(transform.rotation.x, transform.rotation.y, 0.7f, transform.rotation.w);
return;
}
transform.rotation = Quaternion.AngleAxis(ang, Vector3.forward);
}
}
And here is a gif of the problem : http://img15.hostingpics.net/pics/324271Animation.gif
Answer by OrbitGames · May 18, 2016 at 06:44 PM
The problem you are having is probably caused by calculating and clamping the angle. Since the problem is only caused once your mouse is below the center/ your pos.y value is negative, and you only need angles where the y value is positive, you should be able to fix this problem by keeping your y level >= 0;
float ang = Mathf.Atan2(pos.y, pos.x) * Mathf.Rad2Deg - baseAngle;
can be replaced with
float ang = Mathf.Atan2(Mathf.max(pos.y,0), pos.x) * Mathf.Rad2Deg - baseAngle;
hope it works
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