arfoundation-samples/Assets/Scripts/RotationController.cs

using UnityEngine;
using UnityEngine.UI;

/// <summary>
/// Controls the orientation of content place by the <see cref="MakeAppearOnPlane"/>
/// component using a UI.Slider to affect the rotation about the Y axis.
/// </summary>
[RequireComponent(typeof(MakeAppearOnPlane))]
public class RotationController : MonoBehaviour
{
    MakeAppearOnPlane m_MakeAppearOnPlane;

    [SerializeField]
    [Tooltip("The slider used to control rotation.")]
    Slider m_Slider;

    /// <summary>
    /// The slider used to control scale.
    /// </summary>
    public Slider slider
    {
        get { return m_Slider; }
        set { m_Slider = value; }
    }

    [SerializeField]
    [Tooltip("The text used to display the current rotation on the screen.")]
    Text m_Text;

    /// <summary>
    /// The text used to display the current rotation on the screen.
    /// </summary>
    public Text text
    {
        get { return m_Text; }
        set { m_Text = value; }
    }

    [SerializeField]
    [Tooltip("Minimum rotation angle in degrees.")]
    public float m_Min = 0f;

    /// <summary>
    /// Minimum angle in degrees.
    /// </summary>
    public float min
    {
        get { return m_Min; }
        set { m_Min = value; }
    }

    [SerializeField]
    [Tooltip("Maximum angle in degrees.")]
    public float m_Max = 360f;

    /// <summary>
    /// Maximum angle in degrees.
    /// </summary>
    public float max
    {
        get { return m_Max; }
        set { m_Max = value; }
    }

    /// <summary>
    /// Invoked when the slider's value changes
    /// </summary>
    public void OnSliderValueChanged()
    {
        if (slider != null)
            angle = slider.value * (max - min) + min;
    }

    float angle
    {
        get
        {
            return m_MakeAppearOnPlane.rotation.eulerAngles.y;
        }
        set
        {
            m_MakeAppearOnPlane.rotation = Quaternion.AngleAxis(value, Vector3.up);
            UpdateText();
        }
    }

    void Awake()
    {
        m_MakeAppearOnPlane = GetComponent<MakeAppearOnPlane>();
    }

    void OnEnable()
    {
        if (slider != null)
            slider.value = (angle - min) / (max - min);
        UpdateText();
    }

    void UpdateText()
    {
        if (m_Text != null)
            m_Text.text = "Rotation: " + angle + " degrees";
    }
}