89 lines
3.3 KiB
C#
89 lines
3.3 KiB
C#
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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namespace MoreMountains.Tools
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{
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/// <summary>
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/// Add this class to an empty object, bind a few prefabs into its RandomPool slots, and it'll instantiate one of them at its position/rotation on Start or Awake
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/// You can also call its InstantiateRandomObject method at any time, and it'll instantiate another random object on demand,
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/// potentially destroying the previous one if you decide so
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/// </summary>
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public class MMRandomInstantiator : MonoBehaviour
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{
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/// the possible start modes
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public enum StartModes { Awake, Start, None }
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[Header("Random instantiation")]
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/// whether this instantiator should auto trigger on Awake, Start, or never
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public StartModes StartMode = StartModes.Awake;
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/// the name to give to the instantiated object
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public string InstantiatedObjectName = "RandomInstantiated";
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/// if this is true, the instantiated object will be parented to the spawner
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public bool ParentInstantiatedToThisObject = true;
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/// if this is true, every time InstantiateRandomObject is called, any previously instantiated object will be destroyed
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public bool DestroyPreviouslyInstantiatedObject = true;
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/// the list containing all the objects that can potentially be instantiated
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public List<GameObject> RandomPool;
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[Header("Test")]
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/// a test button for your inspector
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[MMInspectorButton("InstantiateRandomObject")]
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public bool InstantiateButton;
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protected GameObject _instantiatedGameObject;
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/// <summary>
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/// On awake we instantiate if needed
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/// </summary>
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protected virtual void Awake()
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{
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if (StartMode == StartModes.Awake)
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{
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InstantiateRandomObject();
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}
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}
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/// <summary>
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/// On Start we instantiate if needed
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/// </summary>
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protected virtual void Start()
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{
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if (StartMode == StartModes.Start)
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{
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InstantiateRandomObject();
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}
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}
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/// <summary>
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/// Spawns a random object from the pool of choices
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/// </summary>
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public virtual void InstantiateRandomObject()
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{
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// if the pool is empty we do nothing and exit
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if (RandomPool.Count == 0)
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{
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return;
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}
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// we destroy our previous object if needed
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if (DestroyPreviouslyInstantiatedObject)
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{
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if (_instantiatedGameObject != null)
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{
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DestroyImmediate(_instantiatedGameObject);
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}
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}
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// pick a random object and instantiates it
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int randomIndex = Random.Range(0, RandomPool.Count);
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_instantiatedGameObject = Instantiate(RandomPool[randomIndex], this.transform.position, this.transform.rotation);
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_instantiatedGameObject.name = InstantiatedObjectName;
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if (ParentInstantiatedToThisObject)
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{
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_instantiatedGameObject.transform.SetParent(this.transform);
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}
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}
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}
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}
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