122 lines
3.3 KiB
C#
122 lines
3.3 KiB
C#
using UnityEngine;
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using UnityEngine.Events;
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using System.Collections.Generic;
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using FSA = UnityEngine.Serialization.FormerlySerializedAsAttribute;
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namespace Lean.Common
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{
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/// <summary>This component causes the current Transform to follow the specified trail of positions.</summary>
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[HelpURL(LeanHelper.PlusHelpUrlPrefix + "LeanFollow")]
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[AddComponentMenu(LeanHelper.ComponentPathPrefix + "Follow")]
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public class LeanFollow : MonoBehaviour
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{
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/// <summary>When this object is within this many world space units of the next point, it will be removed.</summary>
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public float Threshold { set { threshold = value; } get { return threshold; } } [FSA("Threshold")] [SerializeField] private float threshold = 0.001f;
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/// <summary>The speed of the following in units per seconds.</summary>
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public float Speed { set { speed = value; } get { return speed; } } [FSA("Speed")] [SerializeField] private float speed = 1.0f;
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public UnityEvent OnReachedDestination { get { if (onReachedDestination == null) onReachedDestination = new UnityEvent(); return onReachedDestination; } } [SerializeField] private UnityEvent onReachedDestination;
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[SerializeField]
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private List<Vector3> positions;
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/// <summary>This method will remove all follow positions, and stop movement.</summary>
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[ContextMenu("Clear Positions")]
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public void ClearPositions()
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{
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if (positions != null)
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{
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positions.Clear();
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}
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}
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public void SnapToNextPosition()
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{
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if (positions != null && positions.Count > 0)
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{
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transform.position = positions[0];
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}
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}
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/// <summary>This method adds a new position to the follow path.</summary>
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public void AddPosition(Vector3 newPosition)
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{
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if (positions == null)
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{
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positions = new List<Vector3>();
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}
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// Only add newPosition if it's far enough away from the last added point
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if (positions.Count == 0 || Vector3.Distance(positions[positions.Count - 1], newPosition) > threshold)
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{
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positions.Add(newPosition);
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}
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}
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protected virtual void Update()
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{
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if (positions != null)
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{
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var previousCount = positions.Count;
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TrimPositions();
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if (positions.Count > 0)
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{
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var currentPosition = transform.position;
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var targetPosition = positions[0];
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currentPosition = Vector3.MoveTowards(currentPosition, targetPosition, speed * Time.deltaTime);
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transform.position = currentPosition;
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}
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else if (previousCount > 0)
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{
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if (onReachedDestination != null) onReachedDestination.Invoke();
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}
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}
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}
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protected void TrimPositions()
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{
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var currentPosition = transform.position;
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while (positions.Count > 0)
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{
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var distance = Vector3.Distance(currentPosition, positions[0]);
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if (distance > threshold)
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{
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break;
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}
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positions.RemoveAt(0);
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}
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}
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}
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}
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#if UNITY_EDITOR
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namespace Lean.Common.Editor
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{
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using TARGET = LeanFollow;
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[UnityEditor.CanEditMultipleObjects]
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[UnityEditor.CustomEditor(typeof(TARGET), true)]
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public class LeanFollow_Editor : LeanEditor
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{
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protected override void OnInspector()
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{
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TARGET tgt; TARGET[] tgts; GetTargets(out tgt, out tgts);
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Draw("threshold", "When this object is within this many world space units of the next point, it will be removed.");
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Draw("speed", "The speed of the following in units per seconds.");
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Separator();
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Draw("onReachedDestination");
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}
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}
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}
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#endif |