yichael_smartbow/Assets/BowArrow/test-ellipse/Ellipse.cs

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

public class Ellipse : MonoBehaviour
{
    private ParticleSystem particleSystem0;
    List<Vector3> arrayList = new List<Vector3>();

    public Transform ellipseTran;

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

    private Camera cameraX;
    private Camera cameraY;
    private Camera cameraZ;

    // Start is called before the first frame update
    void Start()
    {
        cameraX = cameraXTran.GetComponent<Camera>();
        cameraY = cameraYTran.GetComponent<Camera>();
        cameraZ = cameraZTran.GetComponent<Camera>();
        particleSystem0 = GetComponentInChildren<ParticleSystem>();
        /*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);*/
    }

    //绘制椭圆的大小
    public void setEllipseLocalScaleAndCenter(Vector3 radius,Vector3 center) {
        this.ellipseTran.localScale = radius;
        this.ellipseTran.localPosition = center;
    }

    public void setCameraPos(Vector3 center)
    {
        this.cameraXTran.localPosition = new Vector3(center.x - 10, center.y, center.z);
        this.cameraYTran.localPosition = new Vector3(center.x, center.y + 10, center.z);
        this.cameraZTran.localPosition = new Vector3(center.x, center.y, center.z - 10);
        // 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);
    }

    //描绘点的时候，相机大小自适应
    public void setCameraSize(float magLen) {
        this.cameraX.orthographicSize 
        = this.cameraY.orthographicSize  
        = this.cameraZ.orthographicSize 
        = magLen / 2 * 1.5f;
    }

    //最后绘制圆的时候，相机大小自适应
    public void setCameraSize(Vector3 circleSize) {
        Vector3 vs = new Vector3();
        vs.x = Mathf.Abs(circleSize.x); 
        vs.y = Mathf.Abs(circleSize.y); 
        vs.z = Mathf.Abs(circleSize.z);
        this.cameraX.orthographicSize = Mathf.Max(circleSize.y, circleSize.z) / 2 * 1.5f; 
        this.cameraY.orthographicSize = Mathf.Max(circleSize.x, circleSize.z) / 2 * 1.5f; 
        this.cameraZ.orthographicSize = Mathf.Max(circleSize.x, circleSize.y) / 2 * 1.5f; 
    }


    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.particleSystem0.main;
        main.startSpeed = 0.0f;           
        main.startLifetime = 1000.0f;

        var pointCount = drawList.Count;
        allParticles = new ParticleSystem.Particle[pointCount];
        main.maxParticles = pointCount;
        this.particleSystem0.Emit(pointCount);
        this.particleSystem0.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.particleSystem0.SetParticles(allParticles, pointCount);
    }
}