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Unity3D 在运行时实现物体的移动、旋转、伸缩控制

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using UnityEngine;
using System.Collections;
public class PickMe : MonoBehaviour
{
    enum Mode { SELECT, OPER };
    Mode operMode;
    Rect drawRect = new Rect();
    bool drawSelectRect = false;
    GameObject objDummy;
    ArrayList arya = new ArrayList();
    GameObject[] objChoosen;
    Shader[] matChoosen;
    Transform[] objParent;
    public Material lineMat;
    public GameObject lineShader;
    void Start()
    {
        /*  lineMat=new Material( "Shader \"Lines/Colored Blended\" {" +
                                      "SubShader { Pass { " +
                                      "    Blend SrcAlpha OneMinusSrcAlpha " +
                                      "    ZWrite Off Cull Off Fog { Mode Off } " +
                                      "    BindChannels {" +
                                      "      Bind \"vertex\", vertex Bind \"color\", color }" +
                                      "} } }" );*/
        objDummy = new GameObject("Dummy");
        operMode = Mode.SELECT;
        //  lineMat.SetColor("_Color",new Color(1f,1f,1f,0.2f));
    }
    void OnGUI()
    {
        GUI.Label(new Rect(0, 0, 400, 20), "Left Click drag to Choose Object,Right Click to Cancel Choose");
        GUI.Label(new Rect(0, 30, 100, 90), "Alpha1 move Alpha2 Rotate Alpha3 Scale");
        GUI.Label(new Rect(0, 80, 300, 90), "Mouse mid and alt button to move and rotate the camera ");
    }
    void Update()
    {
        if (Input.GetMouseButtonDown(0) && operMode == Mode.SELECT)
        {
            drawRect.x = Input.mousePosition.x;
            drawRect.y = Input.mousePosition.y;
            drawSelectRect = true;
        }
        if (Input.GetMouseButtonDown(1))
        {
            operMode = Mode.SELECT;
            GizmoRender gzr = objDummy.GetComponent<GizmoRender>();
            Destroy(gzr);
            for (int i = 0; i < objChoosen.Length; i++)
            {
                if (objChoosen[i] != null)
                {
                    if (objChoosen[i].GetComponent<Renderer>() != null)
                        objChoosen[i].GetComponent<Renderer>().material.shader = matChoosen[i];
                    objChoosen[i].transform.parent = objParent[i];
                    BoundRender gzrs = objChoosen[i].GetComponent<BoundRender>();
                    Destroy(gzrs);
                }
            }
            objDummy.transform.DetachChildren();
            objDummy.transform.position = Vector3.zero;
            objDummy.transform.localEulerAngles = Vector3.zero;
            objDummy.transform.localScale = new Vector3(1, 1, 1);
            arya.Clear();
        }
        if (Input.GetMouseButtonUp(0) && operMode == Mode.SELECT)
        {
            FixRect(ref drawRect);
            drawSelectRect = false;
            GameObject[] objs = GameObject.FindGameObjectsWithTag("Choose");
            objs = AddChildObject(objs);
            objChoosen = new GameObject[objs.Length];
            matChoosen = new Shader[objs.Length];
            objParent = new Transform[objs.Length];
            int k = 0;
            for (int i = 0; i < objs.Length; i++)
            {
                Mesh sharedMesh = null;
                Bounds bonds = new Bounds();
                if (objs[i].GetComponent<MeshFilter>() == null || objs[i].GetComponent<MeshRenderer>() == null)
                {
                    if (objs[i].GetComponent<SkinnedMeshRenderer>() == null)
                    {
                        continue;
                    }
                    else
                    {
                        sharedMesh = objs[i].GetComponent<SkinnedMeshRenderer>().sharedMesh;
                        bonds = objs[i].GetComponent<SkinnedMeshRenderer>().GetComponent<Renderer>().bounds;
                    }
                }
                else
                {
                    MeshFilter meshfilter = objs[i].GetComponent<MeshFilter>();
                    MeshRenderer meshRender = objs[i].GetComponent<MeshRenderer>();
                    sharedMesh = meshfilter.sharedMesh;
                    bonds = meshRender.GetComponent<Renderer>().bounds;
                }
                Vector3[] vertices;
                vertices = sharedMesh.vertices;
                Vector3 vec3 = Vector3.zero;
                Vector2 vec2 = Vector2.zero;
                for (int j = 0; j < vertices.Length; j++)
                {
                    vec3 = GetComponent<Camera>().WorldToScreenPoint(objs[i].transform.TransformPoint(vertices[j]));
                    vec2.x = vec3.x;
                    vec2.y = vec3.y;
                    if (drawRect.Contains(vec2))
                    {
                        if (objs[i].GetComponent<BoundRender>() == null)
                        {
                            objs[i].AddComponent<BoundRender>();
                            objDummy.transform.position += bonds.center;
                            operMode = Mode.OPER;
                            objChoosen[k] = objs[i];
                            matChoosen[k] = objs[i].GetComponent<Renderer>().material.shader;
                            objChoosen[k].GetComponent<Renderer>().material.shader = Shader.Find("Transparent/Diffuse");
                            k++;
                        }
                        break;
                    }
                }
            }
            if (k != 0)
            {
                objDummy.transform.position /= k;
                for (int j = 0; j < k; j++)
                {
                    if (objChoosen[j].GetComponent<MeshCollider>() != null)
                        objChoosen[j].GetComponent<MeshCollider>().enabled = false;
                    objParent[j] = objChoosen[j].transform.parent;
                    objChoosen[j].transform.parent = objDummy.transform;
                }
                if (objDummy.GetComponent<GizmoRender>() == null)
                {
                    objDummy.AddComponent<GizmoRender>();
                    objDummy.GetComponent<GizmoRender>().eAxis = true;
                }
            }
        }
        if (drawSelectRect && operMode == Mode.SELECT)
        {
            drawRect.height = Input.mousePosition.y - drawRect.y;
            drawRect.width = Input.mousePosition.x - drawRect.x;
        }
        if (Input.GetKeyDown(KeyCode.Alpha1))
        {
            if (objDummy.GetComponent<GizmoRender>())
            {
                objDummy.GetComponent<GizmoRender>().eAxis = true;
                objDummy.GetComponent<GizmoRender>().eRotate = false;
                objDummy.GetComponent<GizmoRender>().eScal = false;
            }
        }
        if (Input.GetKeyDown(KeyCode.Alpha2))
        {
            if (objDummy.GetComponent<GizmoRender>())
            {
                objDummy.GetComponent<GizmoRender>().eAxis = false;
                objDummy.GetComponent<GizmoRender>().eRotate = true;
                objDummy.GetComponent<GizmoRender>().eScal = false;
            }
        }
        if (Input.GetKeyDown(KeyCode.Alpha3))
        {
            if (objDummy.GetComponent<GizmoRender>())
            {
                objDummy.GetComponent<GizmoRender>().eAxis = false;
                objDummy.GetComponent<GizmoRender>().eRotate = false;
                objDummy.GetComponent<GizmoRender>().eScal = true;
            }
        }
    }
    void FixRect(ref Rect rect)
    {
        if (rect.width < 0)
        {
            rect.x += rect.width;
            rect.width = -rect.width;
        }
        if (rect.height < 0)
        {
            rect.y += rect.height;
            rect.height = -rect.height;
        }
    }
    GameObject[] AddChildObject(GameObject[] objs)
    {
        for (int i = 0; i < objs.Length; i++)
        {
            arya.Add(objs[i]);
            CountChildren(objs[i].transform);
        }
        GameObject[] objret = new GameObject[arya.Count];
        for (int j = 0; j < arya.Count; j++)
            objret[j] = (GameObject)arya[j];
        return objret;
    }
    void CountChildren(Transform c)
    {
        foreach (Transform a in c)
        {
            if (a.gameObject.CompareTag("Choose"))
            {
                break;
            }
            else
            {
                arya.Add(a.gameObject);
            }
            CountChildren(a);
        }
    }
    void OnRenderObject()
    {
        if (drawSelectRect)
        {
            lineMat.SetPass(0);
            GL.Color(new Color(1f, 1f, 1f, 0.2f));
            GL.PushMatrix();
            GL.LoadOrtho();
            GL.Begin(GL.QUADS);
            if (drawRect.width * drawRect.height < 0)
            {
                GL.Vertex3(drawRect.x / Screen.width, drawRect.y / Screen.height, 0);
                GL.Vertex3((drawRect.x + drawRect.width) / Screen.width, drawRect.y / Screen.height, 0);
                GL.Vertex3((drawRect.x + drawRect.width) / Screen.width, (drawRect.y + drawRect.height) / Screen.height, 0);
                GL.Vertex3(drawRect.x / Screen.width, (drawRect.y + drawRect.height) / Screen.height, 0);
            }
            else
            {
                GL.Vertex3(drawRect.x / Screen.width, drawRect.y / Screen.height, 0);
                GL.Vertex3(drawRect.x / Screen.width, (drawRect.y + drawRect.height) / Screen.height, 0);
                GL.Vertex3((drawRect.x + drawRect.width) / Screen.width, (drawRect.y + drawRect.height) / Screen.height, 0);
                GL.Vertex3((drawRect.x + drawRect.width) / Screen.width, drawRect.y / Screen.height, 0);
            }
            GL.End();
            GL.PopMatrix();
        }
    }
}