圓形拖拽滑動條
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using UnityEngine.UI;
public class CircularDrag : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler,IPointerDownHandler
{
public void OnBeginDrag(PointerEventData eventData)
{
}
public void OnDrag(PointerEventData eventData)
{
Drag(eventData);
}
public void OnEndDrag(PointerEventData eventData)
{
//throw new System.NotImplementedException();
}
public void OnPointerDown(PointerEventData eventData)
{
Drag(eventData);
}
[SerializeField]
private RectTransform m_Hander;
public RectTransform Hander
{
get
{
return m_Hander;
}
set
{
m_Hander = value;
}
}
private float _Radius;
public float Radius
{
get
{
if (rectTransform)
{
return rectTransform.rect.width / 2;
}
return 1;
}
set
{
_Radius = value;
}
}
public void SetDragHander(Transform hander)
{
}
public RectTransform rectTransform
{
get
{
return (RectTransform)transform;
}
}
public Canvas canvas;
public void Drag(PointerEventData eventData)
{
setPos(eventData);
}
public Vector2 lastPos;
public Action<Vector2> OnChange
{
get;set;
}
[SerializeField]
private float m_Sensitivity = 2;
public float Sensitivity
{
get;set;
}
private Vector2 _Value;
public Vector2 Value
{
get
{
return GetValue();
}
set
{
_Value = value;
SetValue(_Value);
}
}
public void setPos(PointerEventData eventData)
{
if (Hander)
{
if (Vector2.Distance(Hander.anchoredPosition, lastPos) < m_Sensitivity)
{
//return;
}
Vector2 pos;
RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, eventData.position, canvas.worldCamera, out pos);
if (Vector2.Distance(rectTransform.anchoredPosition, pos) >= Radius)
{
Vector2 normal = (pos - rectTransform.anchoredPosition).normalized;
pos = rectTransform.anchoredPosition + Vector2.Scale(normal, new Vector2(Radius,Radius) );
}
Hander.anchoredPosition = pos;
lastPos = pos;
if (OnChange != null)
{
OnChange.Invoke(GetValue());
}
}
}
public void SetValue(Vector2 value)
{
float bagePow = Mathf.Pow(Radius, 2) / 2;
float bage = Mathf.Sqrt(bagePow);
value = Vector2.Scale(value, new Vector2(2,2));
Vector2 curVector = Vector2.Scale(new Vector2(bage, bage),value);
Hander.anchoredPosition = curVector;
}
private Vector2 GetValue()
{
float bagePow = Mathf.Pow(Radius, 2) / 2;
float bage = Mathf.Sqrt(bagePow);
Vector2 curPos = (Hander.anchoredPosition - rectTransform.anchoredPosition);
curPos = Vector2.Scale(curPos, new Vector2(1 / bage, 1 / bage));
curPos.x = Mathf.Clamp(curPos.x, -1, 1);
curPos.y = Mathf.Clamp(curPos.y, -1, 1);
curPos = Vector2.Scale(curPos, new Vector2(0.5f, 0.5f));
return curPos;
}
// Use this for initialization
void Start () {
OnChange = (v) => print(v);
}
// Update is called once per frame
void Update () {
}
}
