yichael_smartbowtv/Assets/test-ellipse/Ellipse.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class Ellipse : MonoBehaviour
{
    public ParticleSystem particleSystem;
    List<Vector3> arrayList = new List<Vector3>();

    public Transform ellipseTran;

    public Transform cameraXTran;
    public Transform cameraYTran;
    public Transform cameraZTran;

    // Start is called before the first frame update
    void Start()
    {
        /*ArrayList arrayList = new ArrayList();
        for (int i = 0; i < 100000; i++) {
            int xSymbol = Random.value > 0.5 ? -1 : 1;
            int ySymbol = Random.value > 0.5 ? -1 : 1;
            int zSymbol = Random.value > 0.5 ? -1 : 1;
            var vec = new Vector3(Random.value* xSymbol, Random.value* ySymbol, Random.value* zSymbol);
            arrayList.Add(vec);
        }
        this.DrawPointCloud(arrayList);*/
    }

    // Update is called once per frame
    void Update()
    {
      
    }
    //绘制椭圆的大小
    public void setEllipseLocalScaleAndCenter(Vector3 radius,Vector3 center) {

        this.ellipseTran.localScale = radius;
        this.ellipseTran.localPosition = center;

    }

    //设置camera 的观测位置
    public void setCameraPos(Vector3 center)
    {

        this.cameraXTran.localPosition = new Vector3(this.cameraXTran.localPosition.x, center.y, center.z);

        this.cameraYTran.localPosition = new Vector3(center.x, this.cameraYTran.localPosition.y,center.z );

        this.cameraZTran.localPosition = new Vector3(center.x, center.y, this.cameraZTran.localPosition.z);
    }


    public void AddAndUpdatePointArray(Vector3 addPoint) {
        this.arrayList.Add(addPoint);
        this.DrawPointCloud(this.arrayList);
    }

    public void ClearAndUpdatePointArray() {
        this.arrayList.Clear();
        this.DrawPointCloud(this.arrayList);
    }

    ParticleSystem.Particle[] allParticles;   
    public void DrawPointCloud(List<Vector3> drawList)
    {
        var main = this.particleSystem.main;
        main.startSpeed = 0.0f;           
        main.startLifetime = 1000.0f;

        var pointCount = drawList.Count;
        allParticles = new ParticleSystem.Particle[pointCount];
        main.maxParticles = pointCount;
        this.particleSystem.Emit(pointCount);
        this.particleSystem.GetParticles(allParticles);
        for (int i = 0; i < pointCount; i++)
        {
            allParticles[i].position = (Vector3)drawList[i]; 
            allParticles[i].startColor = Color.yellow; 
            allParticles[i].startSize = 0.02f;
        }

        this.particleSystem.SetParticles(allParticles, pointCount);
    }
}