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

public class VerletStick
{
    private VerletParticle particleA;
    private VerletParticle particleB;
    private float length;
    public float stiffness = 0.75f;  // Add this line

    public VerletStick(VerletParticle particleA, VerletParticle particleB, float length)
    {
        this.particleA = particleA;
        this.particleB = particleB;
        this.length = length;
        stiffness = Mathf.Clamp(0.2f * (length / 0.5f), 0.5f, 0.75f);  // 调整范围根据需要
    }

    public void UpdateStick()
    {
        float currentLength = Vector3.Distance(particleA.position, particleB.position);
        float difference = length - currentLength;
        Vector3 direction = (particleB.position - particleA.position).normalized;

        if (!particleA.isLocked)
        {
            particleA.position -= direction * difference * stiffness;
        }

        if (!particleB.isLocked)
        {
            particleB.position += direction * difference * stiffness;
        }
    }
}