using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.EventSystems; public class Joystick : MonoBehaviour, IPointerDownHandler, IDragHandler, IPointerUpHandler { public float Horizontal { get { return (snapX) ? SnapFloat(input.x, AxisOptions.Horizontal) : input.x; } } public float Vertical { get { return (snapY) ? SnapFloat(input.y, AxisOptions.Vertical) : input.y; } } public Vector2 Direction { get { return new Vector2(Horizontal, Vertical); } } public float HandleRange { get { return handleRange; } set { handleRange = Mathf.Abs(value); } } public float DeadZone { get { return deadZone; } set { deadZone = Mathf.Abs(value); } } public AxisOptions AxisOptions { get { return AxisOptions; } set { axisOptions = value; } } public bool SnapX { get { return snapX; } set { snapX = value; } } public bool SnapY { get { return snapY; } set { snapY = value; } } [SerializeField] private float handleRange = 1; [SerializeField] private float deadZone = 0; [SerializeField] private AxisOptions axisOptions = AxisOptions.Both; [SerializeField] private bool snapX = false; [SerializeField] private bool snapY = false; [SerializeField] protected RectTransform background = null; [SerializeField] private RectTransform handle = null; private RectTransform baseRect = null; private Canvas canvas; private Camera cam; public Vector2 input = Vector2.zero; protected virtual void Start() { HandleRange = handleRange; DeadZone = deadZone; baseRect = GetComponent(); canvas = GetComponentInParent(); if (canvas == null) Debug.LogError("The Joystick is not placed inside a canvas"); Vector2 center = new Vector2(0.5f, 0.5f); background.pivot = center; handle.anchorMin = center; handle.anchorMax = center; handle.pivot = center; handle.anchoredPosition = Vector2.zero; } public virtual void OnPointerDown(PointerEventData eventData) { OnDrag(eventData); } public void OnDrag(PointerEventData eventData) { cam = null; if (canvas.renderMode == RenderMode.ScreenSpaceCamera) cam = canvas.worldCamera; Vector2 position = RectTransformUtility.WorldToScreenPoint(cam, background.position); Vector2 radius = background.sizeDelta / 2; input = (eventData.position - position) / (radius * canvas.scaleFactor); FormatInput(); HandleInput(input.magnitude, input.normalized, radius, cam); handle.anchoredPosition = input * radius * handleRange; } protected virtual void HandleInput(float magnitude, Vector2 normalised, Vector2 radius, Camera cam) { if (magnitude > deadZone) { if (magnitude > 1) input = normalised; } else input = Vector2.zero; } private void FormatInput() { if (axisOptions == AxisOptions.Horizontal) input = new Vector2(input.x, 0f); else if (axisOptions == AxisOptions.Vertical) input = new Vector2(0f, input.y); } private float SnapFloat(float value, AxisOptions snapAxis) { if (value == 0) return value; if (axisOptions == AxisOptions.Both) { float angle = Vector2.Angle(input, Vector2.up); if (snapAxis == AxisOptions.Horizontal) { if (angle < 22.5f || angle > 157.5f) return 0; else return (value > 0) ? 1 : -1; } else if (snapAxis == AxisOptions.Vertical) { if (angle > 67.5f && angle < 112.5f) return 0; else return (value > 0) ? 1 : -1; } return value; } else { if (value > 0) return 1; if (value < 0) return -1; } return 0; } public virtual void OnPointerUp(PointerEventData eventData) { input = Vector2.zero; handle.anchoredPosition = Vector2.zero; } protected Vector2 ScreenPointToAnchoredPosition(Vector2 screenPosition) { Vector2 localPoint = Vector2.zero; if (RectTransformUtility.ScreenPointToLocalPointInRectangle(baseRect, screenPosition, cam, out localPoint)) { Vector2 pivotOffset = baseRect.pivot * baseRect.sizeDelta; return localPoint - (background.anchorMax * baseRect.sizeDelta) + pivotOffset; } return Vector2.zero; } } public enum AxisOptions { Both, Horizontal, Vertical }