unity3d触屏操作对象运动

using UnityEngine;

using System.Collections;



public class robot : MonoBehaviour {

	

	private GameObject myRobot;

	private Camera carmera;

	

	// Use this for initialization

	void Start () {

		myRobot = GameObject.Find("robot");

		//carmera = Camera.main;

		//第二种方式去获取Camera

		//carmera = GameObject.Find("Main Camera").GetComponent<Camera>();

			

		Input.multiTouchEnabled = true;

	}

	

	// Update is called once per frame

	void Update () {

		handInput();

	}

	

	void handInput() {

#if !UNITY_EDITOR && ( UNITY_IOS || UNITY_ANDROID ) 

		mobileInput();

#else

		if (Input.GetKey(KeyCode.UpArrow)) {

			myRobot.transform.Translate(Vector3.forward * Time.deltaTime);

		}

		if (Input.GetKey(KeyCode.DownArrow)) {

			myRobot.transform.Translate(-Vector3.forward * Time.deltaTime);

		}

		if (Input.GetKey(KeyCode.LeftArrow)) {

			myRobot.transform.Translate(Vector3.left * Time.deltaTime);

		}

		if (Input.GetKey(KeyCode.RightArrow)) {

			myRobot.transform.Translate(Vector3.right * Time.deltaTime);

		}

//		float x = carmera.WorldToScreenPoint(myRobot.transform.position).x;

//		Debug.Log("x = " + x);

#endif 

	}

	

	void mobileInput() {

		if (Input.touchCount == 1) {

			

			if (Input.touches[0].phase == TouchPhase.Moved){

				float x = Input.touches[0].position.x;

				float y = Input.touches[0].position.y;

				if (x > carmera.WorldToScreenPoint(myRobot.transform.position).x) {					

					myRobot.transform.Translate(Vector3.right * Time.deltaTime); 

				} else if (x < carmera.WorldToScreenPoint(myRobot.transform.position).x) {							

					myRobot.transform.Translate(-Vector3.right * Time.deltaTime); 

				}

				

				if (y > carmera.WorldToScreenPoint(myRobot.transform.position).y) {					

					myRobot.transform.Translate(Vector3.forward * Time.deltaTime); 

				} else if (y < carmera.WorldToScreenPoint(myRobot.transform.position).y) {							

					myRobot.transform.Translate(-Vector3.forward * Time.deltaTime); 

				}				

			}

		}

	}

	

}

　　1. 两种获取Camera方式。

     2. 手机触屏操作，需要进行世界坐标转屏幕坐标。