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using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Events;
using UnityEngine.EventSystems;
using System.Collections;
#if UNITY_EDITOR
using UnityEditor;
#endif
namespace UnityEngine.UI {
[AddComponentMenu("UI/Joystick", 36), RequireComponent(typeof(RectTransform))]
public class Joystick : UIBehaviour, IBeginDragHandler, IEndDragHandler, IDragHandler {
[SerializeField, Tooltip("The graphic that will be moved around")]
RectTransform _joystickGraphic;
public RectTransform JoystickGraphic {
get { return _joystickGraphic; }
set {
_joystickGraphic = value;
UpdateJoystickGraphic();
}
}
[SerializeField]
Vector2 _axis;
[SerializeField, Tooltip("How fast the joystick will go back to the center")]
float _spring = 25;
public float Spring {
get { return _spring; }
set { _spring = value; }
}
[SerializeField, Tooltip("How close to the center that the axis will be output as 0")]
float _deadZone = .1f;
public float DeadZone {
get { return _deadZone; }
set { _deadZone = value; }
}
[Tooltip("Customize the output that is sent in OnValueChange")]
public AnimationCurve outputCurve = new AnimationCurve(new Keyframe(0, 0, 1, 1), new Keyframe(1, 1, 1, 1));
public JoystickMoveEvent OnValueChange;
public Vector2 JoystickAxis {
get {
Vector2 outputPoint = _axis.magnitude > _deadZone ? _axis : Vector2.zero;
float magnitude = outputPoint.magnitude;
outputPoint *= outputCurve.Evaluate(magnitude);
return outputPoint;
}
set { SetAxis(value); }
}
RectTransform _rectTransform;
public RectTransform rectTransform {
get {
if(!_rectTransform) _rectTransform = transform as RectTransform;
return _rectTransform;
}
}
bool _isDragging;
[HideInInspector]
bool dontCallEvent;
public void OnBeginDrag(PointerEventData eventData) {
if(!IsActive())
return;
EventSystemManager.currentSystem.SetSelectedGameObject(gameObject, eventData);
Vector2 newAxis = transform.InverseTransformPoint(eventData.position);
newAxis.x /= rectTransform.sizeDelta.x * .5f;
newAxis.y /= rectTransform.sizeDelta.y * .5f;
SetAxis(newAxis);
_isDragging = true;
dontCallEvent = true;
}
public void OnEndDrag(PointerEventData eventData) {
_isDragging = false;
}
public void OnDrag(PointerEventData eventData) {
RectTransformUtility.ScreenPointToLocalPointInRectangle(rectTransform, eventData.position, eventData.pressEventCamera, out _axis);
_axis.x /= rectTransform.sizeDelta.x * .5f;
_axis.y /= rectTransform.sizeDelta.y * .5f;
SetAxis(_axis);
dontCallEvent = true;
}
void OnDeselect() {
_isDragging = false;
}
void Update() {
if(_isDragging)
if(!dontCallEvent)
if(OnValueChange != null) OnValueChange.Invoke(JoystickAxis);
}
void LateUpdate() {
if(!_isDragging)
if(_axis != Vector2.zero) {
Vector2 newAxis = _axis - (_axis * Time.unscaledDeltaTime * _spring);
if(newAxis.sqrMagnitude <= .0001f)
newAxis = Vector2.zero;
SetAxis(newAxis);
}
dontCallEvent = false;
}
protected override void OnValidate() {
base.OnValidate();
UpdateJoystickGraphic();
}
public void SetAxis(Vector2 axis) {
_axis = Vector2.ClampMagnitude(axis, 1);
Vector2 outputPoint = _axis.magnitude > _deadZone ? _axis : Vector2.zero;
float magnitude = outputPoint.magnitude;
outputPoint *= outputCurve.Evaluate(magnitude);
if(!dontCallEvent)
if(OnValueChange != null)
OnValueChange.Invoke(outputPoint);
UpdateJoystickGraphic();
}
void UpdateJoystickGraphic() {
if(_joystickGraphic)
_joystickGraphic.localPosition = _axis * Mathf.Max(rectTransform.sizeDelta.x, rectTransform.sizeDelta.y) * .5f;
}
[System.Serializable]
public class JoystickMoveEvent : UnityEvent<Vector2> { }
}
}
#if UNITY_EDITOR
static class JoystickGameObjectCreator {
[MenuItem("GameObject/UI/Joystick", false, 2000)]
static void Create() {
GameObject go = new GameObject("Joystick", typeof(Joystick));
Canvas canvas = Selection.activeGameObject ? Selection.activeGameObject.GetComponent<Canvas>() : null;
Selection.activeGameObject = go;
if(!canvas)
canvas = Object.FindObjectOfType<Canvas>();
if(!canvas) {
canvas = new GameObject("Canvas", typeof(Canvas), typeof(RectTransform), typeof(GraphicRaycaster)).GetComponent<Canvas>();
canvas.renderMode = RenderMode.Overlay;
}
if(canvas)
go.transform.SetParent(canvas.transform, false);
GameObject background = new GameObject("Background", typeof(Image));
GameObject graphic = new GameObject("Graphic", typeof(Image));
background.transform.SetParent(go.transform, false);
graphic.transform.SetParent(go.transform, false);
background.GetComponent<Image>().color = new Color(1, 1, 1, .86f);
RectTransform backgroundTransform = graphic.transform as RectTransform;
RectTransform graphicTransform = graphic.transform as RectTransform;
graphicTransform.sizeDelta = backgroundTransform.sizeDelta * .5f;
Joystick joystick = go.GetComponent<Joystick>();
joystick.JoystickGraphic = graphicTransform;
}
}
#endif
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