69 lines
2.2 KiB
C#
69 lines
2.2 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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public class LimitTrailRenderer : MonoBehaviour {
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[SerializeField]
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private float time = 1.0f;
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[SerializeField]
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private float length = 10.0f;
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[SerializeField]
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private LineRenderer[] lineRendererArray = default;
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private List<(float, Vector3)> worldList = new List<(float, Vector3)>();
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private List<Vector3> localList = new List<Vector3>();
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void OnEnable(){
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worldList.Clear();
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}
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void LateUpdate(){
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var deltaTime = Time.deltaTime;
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for(int i = 0; i < worldList.Count; ++i){
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var t = worldList[i];
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t.Item1 += deltaTime;
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worldList[i] = t;
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}
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worldList.Add((0.0f, transform.position));
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while(worldList.Count > 2 && worldList[1].Item1 > time){
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worldList.RemoveAt(0);
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}
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localList.Clear();
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var prev = transform.position;
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var totalLength = 0.0f;
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for(int i = worldList.Count - 1; i >= 0 && totalLength <= length * length; --i){
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var position = worldList[i].Item2;
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totalLength += (position - prev).MagnitudeNotSqrt();
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localList.Add(position);
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}
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if(localList.Count >= 2){
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var l = 0.0f;
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for(int i = 1; i < localList.Count - 1; ++i){
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l += (localList[i - 1] - localList[i]).magnitude;
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}
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if(l > length){
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localList[localList.Count - 1] = localList[localList.Count - 2] + (localList[localList.Count - 1] - localList[localList.Count - 2]) * (length - l) / (Mathf.Sqrt(totalLength) - l);
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}
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}
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var positions = localList.ToArray();
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foreach(var line in lineRendererArray){
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line.positionCount = positions.Length;
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line.SetPositions(positions);
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}
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}
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public void InsertPosition(Vector3 position, float deltaTime){
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worldList.Add((deltaTime, position));
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}
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public void AddPosition(Vector3 value){
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for(int i = 0; i < worldList.Count; ++i){
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var t = worldList[i];
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t.Item2 += value;
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worldList[i] = t;
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}
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}
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}
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