Slender/Assets/Plugins/Assembly-UnityScript-firstpass/DragRigidbody.cs

using System;
using System.Collections;
// using System.Collections.Generic;
// using Boo.Lang;
using UnityEngine;

[Serializable]
public class DragRigidbody : MonoBehaviour
{
    public float spring = 50.0f;
    public float damper = 5.0f;
    public float drag = 10.0f;
    public float angularDrag = 5.0f;
    public float distance = 0.2f;
    public bool attachToCenterOfMass = false;

    private SpringJoint springJoint;

    void Update()
    {
        if (!Input.GetMouseButtonDown(0))
            return;

        Camera cam = FindCamera();

        RaycastHit hit;

        if (
            Physics.Raycast(
                cam.ScreenPointToRay(Input.mousePosition),
                out hit,
                100f
            )
            && hit.rigidbody != null
            && !hit.rigidbody.isKinematic
        )
        {
            if (!springJoint)
            {
                GameObject go = new GameObject("Rigidbody dragger");

                Rigidbody body = go.AddComponent<Rigidbody>();
                body.isKinematic = true;

                springJoint = go.AddComponent<SpringJoint>();
            }

            springJoint.transform.position = hit.point;

            if (attachToCenterOfMass)
            {
                Vector3 anchor =
                    transform.TransformDirection(hit.rigidbody.centerOfMass)
                    + hit.rigidbody.transform.position;

                anchor = springJoint.transform.InverseTransformPoint(anchor);

                springJoint.anchor = anchor;
            }
            else
            {
                springJoint.anchor = Vector3.zero;
            }

            springJoint.spring = spring;
            springJoint.damper = damper;
            springJoint.maxDistance = distance;
            springJoint.connectedBody = hit.rigidbody;

            StartCoroutine(DragObject(hit.distance));
        }
    }

    IEnumerator DragObject(float distance)
    {
        float oldDrag = springJoint.connectedBody.linearDamping;
        float oldAngularDrag = springJoint.connectedBody.angularDamping;

        springJoint.connectedBody.linearDamping = drag;
        springJoint.connectedBody.angularDamping = angularDrag;

        Camera cam = FindCamera();

        while (Input.GetMouseButton(0))
        {
            Ray ray = cam.ScreenPointToRay(Input.mousePosition);

            springJoint.transform.position = ray.GetPoint(distance);

            yield return null;
        }

        if (springJoint.connectedBody)
        {
            springJoint.connectedBody.linearDamping = oldDrag;
            springJoint.connectedBody.angularDamping = oldAngularDrag;
            springJoint.connectedBody = null;
        }
    }

    Camera FindCamera()
    {
        Camera cam = GetComponent<Camera>();

        if (cam != null)
            return cam;

        return Camera.main;
    }
}