using System;
using UnityEngine;

[Serializable]
public class Spring2D
{
	public int p1;

	public int p2;

	public float restLen;

	public float ks;

	public float kd;

	public float len;

	public Spring2D(int _p1, int _p2, float _ks, float _kd, MegaSoft2D mod)
	{
		p1 = _p1;
		p2 = _p2;
		ks = _ks;
		kd = _kd;
		restLen = Vector2.Distance(mod.masses[p1].pos, mod.masses[p2].pos);
		len = restLen;
	}

	public void doCalculateSpringForce(MegaSoft2D mod)
	{
		Vector2 vector = mod.masses[p1].pos - mod.masses[p2].pos;
		float magnitude = vector.magnitude;
		float num = (magnitude - restLen) * ks;
		Vector2 lhs = mod.masses[p1].vel - mod.masses[p2].vel;
		float num2 = Vector2.Dot(lhs, vector) * kd / magnitude;
		Vector2 vector2 = vector * (1f / magnitude);
		vector2 *= 0f - (num + num2);
		mod.masses[p1].force += vector2;
		mod.masses[p2].force -= vector2;
	}

	public void doCalculateSpringForce1(MegaSoft2D mod)
	{
		Vector2 vector = mod.masses[p1].pos - mod.masses[p2].pos;
		if (vector != Vector2.zero)
		{
			float magnitude = vector.magnitude;
			vector = vector.normalized;
			Vector2 vector2 = (0f - ks) * ((magnitude - restLen) * vector);
			mod.masses[p1].force += vector2;
			mod.masses[p2].force -= vector2;
			len = magnitude;
		}
	}

	public void doCalculateSpringForce2(MegaSoft2D mod)
	{
		Vector2 vector = mod.masses[p1].pos - mod.masses[p2].pos;
		float magnitude = vector.magnitude;
		float num = (magnitude - restLen) * ks;
		float num2 = magnitude - len;
		float num3 = num2 * kd / magnitude;
		Vector2 vector2 = vector * (1f / magnitude);
		vector2 *= 0f - (num + num3);
		mod.masses[p1].force += vector2;
		mod.masses[p2].force -= vector2;
	}
}