MeasureDistance.cs

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using UnityEngine;
using System.Collections;

public class MeasureDistance : MonoBehaviour 
{
    LineRenderer mLine;
    public GameObject obj1;
    public GameObject obj2;
    public GameObject lineObject;

    private LineRenderer line;
    private float objDistance;
    public bool isChange = false;
    private float coordinate_x=-100;
    private float coordinate_y=-100;
    //private float coordinate_x2=0;
    //private float coordinate_y2=0;
    //private string atominfo="";

    private GameObject halo1;
    private GameObject halo2;
    private Camera mainCamera = null;

    void Start(){
        mainCamera = Camera.main;
    }


    void initLine()
    {
        lineObject = new GameObject("measureline");
        line = lineObject.AddComponent<LineRenderer>();
        line.material = new Material (Shader.Find("Particles/Alpha Blended"));
        line.SetColors(Color.red, Color.red);
        line.SetWidth(0.3f, 0.3f);
//        lineObject.active = false;
        lineObject.SetActive(false);
        objDistance = -1f;
    }


    void OnEnable()
    {
        isChange = false;
        obj1 = null;
        obj2 = null;
        initLine();
    }

    void  Update ()
    { 
        if(mainCamera == null)
            mainCamera = Camera.main;
        if (Input.GetButtonDown ("Fire1")) 
        {
            Ray sRay= mainCamera.ScreenPointToRay (Input.mousePosition);
            RaycastHit sHit;
            if (Physics.Raycast(sRay, out sHit))
            {
                if (isChange)
                {
                    obj2 = sHit.collider.gameObject;
                    
                    line.SetPosition(1, obj2.transform.position);
                    line.name="measureline";
//                    lineObject.active = true;
                    lineObject.SetActive(true);
                    
                    isChange = false;
                    objDistance = Vector3.Distance(obj1.transform.position, obj2.transform.position);
                    
                    halo2=(GameObject)Instantiate(Resources.Load("transparentsphere"),
                                      obj2.transform.localPosition,
                                      new Quaternion(0f,0f,0f,0f));

                    float rad = 0f;
                    if(UI.UIData.atomtype == UI.UIData.AtomType.optihb)
                        rad =obj2.GetComponent<SphereCollider>().radius*2;
                    else
                        rad = obj2.GetComponent<BallUpdate>().GetRealRadius();  

                    halo2.transform.localScale = new Vector3(rad+1,rad+1,rad+1);
                }
                else
                {
                    Destroy(halo1);
                    Destroy(halo2);
                    
                    obj1 = sHit.collider.gameObject;
                    
                    line.SetPosition(0, obj1.transform.position);
//                    lineObject.active = false;
                    lineObject.SetActive(false);

                    isChange = true;
                    objDistance=-1;

                    coordinate_x= Input.mousePosition.x + 5;
                    coordinate_y= Screen.height-Input.mousePosition.y - 20;
//                    coordinate_x2= Input.mousePosition.x ;
//                  coordinate_y2= Screen.height-Input.mousePosition.y ;

                    halo1=(GameObject)Instantiate(Resources.Load("transparentsphere"),
                                      obj1.transform.localPosition,
                                      new Quaternion(0f,0f,0f,0f));

                    float rad = 0f;
                    if(UI.UIData.atomtype == UI.UIData.AtomType.optihb)
                        rad =obj1.GetComponent<SphereCollider>().radius*2;
                    else
                        rad = obj1.GetComponent<BallUpdate>().GetRealRadius();  


                    halo1.transform.localScale = new Vector3(rad+1,rad+1,rad+1);
                }
            }

        }


        if (Input.GetMouseButtonDown(1))
        {
//            lineObject.active = false;
            lineObject.SetActive(false);
            objDistance = -1;
            Destroy(halo1);
            Destroy(halo2);
        }
    }

    void OnGUI()
    {
        if(objDistance > -1)
            GUI.Box(new Rect (coordinate_x,coordinate_y, 100, 20),objDistance.ToString());
    }
    
    void OnDisable()
    {
        Destroy(halo1);
        Destroy(halo2);
        Destroy(lineObject);
    }

}