Added Radial Slider and Example

Still need to add Editor Option for default

Examples/RadialSlider.meta

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Examples/RadialSlider/UpdateRadialValue.cs

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+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using UnityEngine.UI;
+using UnityEngine.UI.Extensions;
+
+public class UpdateRadialValue : MonoBehaviour {
+
+    public InputField input;
+    public RadialSlider slider;
+
+	// Use this for initialization
+	void Start () {
+		
+	}
+	
+	// Update is called once per frame
+	public void UpdateSliderValue () {
+        float value;
+        float.TryParse(input.text, out value);
+        slider.Value = value;
+	}
+
+    public void UpdateSliderAndle()
+    {
+        int value;
+        int.TryParse(input.text, out value);
+        slider.Angle = value;
+    }
+}

Examples/RadialSlider/UpdateRadialValue.cs.meta

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Examples/RadialSlider/radial_slider.unity.meta

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Examples/RadialSlider/radial_sprite.psd.meta

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Scripts/Controls/RadialSlider.cs

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+/// Credit mgear, SimonDarksideJ
+/// Sourced from - https://forum.unity3d.com/threads/radial-slider-circle-slider.326392/#post-3143582
+/// Updated to include lerping features and programatic access to angle/value
+
+using System;
+using System.Collections;
+using UnityEngine.Events;
+using UnityEngine.EventSystems;
+
+namespace UnityEngine.UI.Extensions
+{
+    [RequireComponent(typeof(Image))]
+    public class RadialSlider : MonoBehaviour, IPointerEnterHandler, IPointerDownHandler, IPointerUpHandler
+    {
+        private bool isPointerDown, isPointerReleased, lerpInProgress;
+        private Vector2 m_localPos; 
+        private float m_targetAngle, m_lerpTargetAngle, m_startAngle, m_currentLerpTime;
+        private Camera m_eventCamera;
+        private Image m_image;
+
+        [SerializeField]
+        [Tooltip("Radial Gradient Start Color")]
+        private Color m_startColor = Color.green;
+        [SerializeField]
+        [Tooltip("Radial Gradient End Color")]
+        private Color m_endColor = Color.red;
+        [Tooltip("Move slider absolute or use Lerping?\nDragging only supported with absolute")]
+        [SerializeField]
+        private bool m_lerpToTarget;
+        [Tooltip("Curve to apply to the Lerp\nMust be set to enable Lerp")]
+        [SerializeField]
+        private AnimationCurve m_lerpCurve;
+        [Tooltip("Event fired when value of control changes, outputs an INT angle value")]
+        [SerializeField]
+        private RadialSliderValueChangedEvent _onValueChanged = new RadialSliderValueChangedEvent();
+        [Tooltip("Event fired when value of control changes, outputs a TEXT angle value")]
+        [SerializeField]
+        private RadialSliderTextValueChangedEvent _onTextValueChanged = new RadialSliderTextValueChangedEvent();
+
+        public float Angle
+        {
+            get { return RadialImage.fillAmount * 360f; }
+            set
+            {
+                if (LerpToTarget)
+                {
+                    StartLerp(value / 360f);
+                }
+                else
+                {
+                    UpdateRadialImage(value / 360f);
+                }
+            }
+        }
+
+        public float Value
+        {
+            get { return RadialImage.fillAmount; }
+            set
+            {
+                if (LerpToTarget)
+                {
+                    StartLerp(value);
+                }
+                else
+                {
+                    UpdateRadialImage(value);
+                }
+            }
+        }
+
+        public Color EndColor
+        {
+            get { return m_endColor; }
+            set { m_endColor = value; }
+        }
+
+        public Color StartColor
+        {
+            get { return m_startColor; }
+            set { m_startColor = value; }
+        }
+
+        public bool LerpToTarget
+        {
+            get { return m_lerpToTarget; }
+            set { m_lerpToTarget = value; }
+        }
+
+        public AnimationCurve LerpCurve
+        {
+            get { return m_lerpCurve; }
+            set { m_lerpCurve = value; }
+        }
+
+        public bool LerpInProgress
+        {
+            get { return lerpInProgress; }
+        }
+
+        [Serializable]
+        public class RadialSliderValueChangedEvent : UnityEvent<int> { }
+        [Serializable]
+        public class RadialSliderTextValueChangedEvent : UnityEvent<string> { }
+
+        public Image RadialImage
+        {
+            get
+            {
+                if (m_image == null)
+                {
+                    m_image = GetComponent<Image>();
+                    m_image.type = Image.Type.Filled;
+                    m_image.fillMethod = Image.FillMethod.Radial360;
+                }
+                return m_image;
+            }
+        }
+
+        public RadialSliderValueChangedEvent onValueChanged
+        {
+            get { return _onValueChanged; }
+            set { _onValueChanged = value; }
+        }
+        public RadialSliderTextValueChangedEvent onTextValueChanged
+        {
+            get { return _onTextValueChanged; }
+            set { _onTextValueChanged = value; }
+        }
+
+        private void Update()
+        {
+            if (isPointerDown)
+            {
+                m_targetAngle = GetAngleFromMousePoint();
+                if (!lerpInProgress)
+                {
+                    if (!LerpToTarget)
+                    {
+                        UpdateRadialImage(m_targetAngle);
+
+                        NotifyValueChanged();
+                    }
+                    else
+                    {
+                        if (isPointerReleased) StartLerp(m_targetAngle);
+                        isPointerReleased = false;
+                    }
+                }
+            }
+            if (lerpInProgress && Value != m_lerpTargetAngle)
+            {
+                m_currentLerpTime += Time.deltaTime;
+                float perc = m_currentLerpTime / LerpCurve[LerpCurve.length - 1].time;
+                UpdateRadialImage(Mathf.Lerp(m_startAngle, m_lerpTargetAngle, LerpCurve.Evaluate(perc)));
+            }
+            if (m_currentLerpTime >= LerpCurve[LerpCurve.length - 1].time || Value == m_lerpTargetAngle)
+            {
+                lerpInProgress = false;
+                UpdateRadialImage(m_lerpTargetAngle);
+                NotifyValueChanged();
+            }
+        }
+
+        private void StartLerp(float targetAngle)
+        {
+            if (!lerpInProgress)
+            {
+                m_startAngle = Value;
+                m_lerpTargetAngle = targetAngle;
+                m_currentLerpTime = 0f;
+                lerpInProgress = true;
+            }
+        }
+
+        private float GetAngleFromMousePoint()
+        {
+            RectTransformUtility.ScreenPointToLocalPointInRectangle(transform as RectTransform, Input.mousePosition, m_eventCamera, out m_localPos);
+
+            // radial pos of the mouse position.
+            return (Mathf.Atan2(-m_localPos.y, m_localPos.x) * 180f / Mathf.PI + 180f) / 360f;
+        }
+
+        private void UpdateRadialImage(float targetAngle)
+        {
+            RadialImage.fillAmount = targetAngle;
+
+            RadialImage.color = Color.Lerp(m_startColor, m_endColor, targetAngle);
+        }
+
+        private void NotifyValueChanged()
+        {
+            _onValueChanged.Invoke((int)(m_targetAngle * 360f));
+            _onTextValueChanged.Invoke(((int)(m_targetAngle * 360f)).ToString());
+        }
+
+#if UNITY_EDITOR
+
+        private void OnValidate()
+        {
+            if (LerpToTarget && LerpCurve.length < 2)
+            {
+                LerpToTarget = false;
+                Debug.LogError("Need to define a Lerp Curve to enable 'Lerp To Target'");
+            }
+        }
+#endif
+
+        #region Interfaces
+        // Called when the pointer enters our GUI component.
+        // Start tracking the mouse
+        public void OnPointerEnter(PointerEventData eventData)
+        {
+            m_eventCamera = eventData.enterEventCamera;
+        }
+
+        public void OnPointerDown(PointerEventData eventData)
+        {
+            m_eventCamera = eventData.enterEventCamera;
+            isPointerDown = true;
+        }
+
+        public void OnPointerUp(PointerEventData eventData)
+        {
+            isPointerDown = false;
+            isPointerReleased = true;
+        }
+        #endregion
+    }
+}

Scripts/Controls/RadialSlider.cs.meta

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