Unity3D 在运行时实现物体的移动、旋转、伸缩控制

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();
		}
	}
}