Unity3D 鼠標以及觸屏移動、縮放控制器(相機)

Unity3D 支持多平臺的發佈，但是平時在測試的過程中往往需要在各個平臺之間進行切換，在平時開發中，對象的移動、舞臺縮放使用鼠標控制比較方便，但是在安卓平臺，鼠標就無法發揮作用了，只能使用觸控操作，最近整理了兩種控制器，適用於桌面以及安卓平臺。

最終使用代碼如下：

using UnityEngine;
using System.Text;
using System.Collections.Generic;

public class ControllerObject : MonoBehaviour 
{
	public UILabel uiLabel;
	private PlatformController controller;

	private IList<string> textList;

	void Awake()
	{
		this.textList = new List<string> ();

		#if UNITY_STANDALONE_WIN
			controller = this.gameObject.AddComponent<MouseController>();
		#elif UNITY_ANDROID
			controller = this.gameObject.AddComponent<TouchController>();
		#endif

		controller.Init (OnBeginEndCallback, OnMoveCallback, OnScaleCallback, OnUpdateCallback, OnEndCallback);
	}

	private void OnBeginEndCallback()
	{
		this.uiLabel.text = "開始";
	}

	private void OnMoveCallback(Vector2 direction)
	{
		if(this.textList.Count > 10)
		{
			this.textList.RemoveAt(0);
		}
		this.textList.Add("移動：" + direction.x + ":" + direction.y);
		this.uiLabel.text = this.GetText ();
	}

	private void OnScaleCallback(float distance)
	{
		if(this.textList.Count > 10)
		{
			this.textList.RemoveAt(0);
		}
		this.textList.Add("縮放：" + distance);
		this.uiLabel.text = this.GetText ();
	}

	private void OnUpdateCallback()
	{

	}

	private void OnEndCallback()
	{
		this.uiLabel.text = "結束";
	}

	private string GetText()
	{
		StringBuilder stringBuilder = new StringBuilder ();

		foreach(string text in this.textList)
		{
			stringBuilder.Append(text);
			stringBuilder.Append("\n");
		}

		return stringBuilder.ToString ();
	}
}

下面是各個類的代碼：TouchCallback.cs

using UnityEngine;
using System.Collections;

/// <summary>
/// 觸碰回調函數
/// </summary>
public class TouchCallback
{
	// 開始回調函數，（按鈕按下、觸碰）觸發一次
	public delegate void Begin();

	// 移動回調函數，移動時觸發
	public delegate void Move(Vector2 direction);

	// 縮放回調函數，縮放時觸發
	public delegate void Scale(float distance);

	// 結束回調函數，（按鈕鬆開，觸離）觸發一次
	public delegate void End();

	// 更新回調函數，每偵觸發
	public delegate void Update();
}

using UnityEngine;
using System.Collections;

/// <summary>
/// 平臺控制器
/// </summary>
public class PlatformController : MonoBehaviour
{
	protected TouchCallback.Begin beginCallback;
	protected TouchCallback.Move moveCallback;
	protected TouchCallback.Scale scaleCallback;
	protected TouchCallback.Update updateCallback;
	protected TouchCallback.End endCallback;

	/// <summary>
	/// 初始化回調函數
	/// </summary>
	/// <param name="beginCallback">Begin callback.</param>
	/// <param name="moveCallback">Move callback.</param>
	/// <param name="scaleCallback">Scale callback.</param>
	/// <param name="updateCallback">Update callback.</param>
	/// <param name="endCallback">End callback.</param>
	public virtual void Init(TouchCallback.Begin beginCallback, TouchCallback.Move moveCallback, TouchCallback.Scale scaleCallback, TouchCallback.Update updateCallback, TouchCallback.End endCallback)
	{
		this.beginCallback = beginCallback;
		this.moveCallback = moveCallback;
		this.scaleCallback = scaleCallback;
		this.updateCallback = updateCallback;
		this.endCallback = endCallback;
	}
}

using UnityEngine;
using System.Collections;

/// <summary>
/// 鼠標控制器
/// </summary>
public class MouseController : PlatformController
{	
	/// 鼠標枚舉
	enum MouseTypeEnum
	{
		LEFT = 0
	}

	/// <summary>
	/// 縮放距離
	/// </summary>
	private float scrollDistance;

	/// <summary>
	/// 鼠標按住狀態
	/// </summary>
	private bool mousePressStatus;

	void Update()
	{
		// 按下鼠標、軸
		if (Input.GetMouseButtonDown ((int)MouseTypeEnum.LEFT)) 
		{
			this.mousePressStatus = true;
			// 觸發開始回調函數
			if(this.beginCallback != null) this.beginCallback();
		}
		// 鬆開鼠標、軸
		if (Input.GetMouseButtonUp ((int)MouseTypeEnum.LEFT)) 
		{
			this.mousePressStatus = false;
			// 觸發結束回調函數
			if(this.endCallback != null) this.endCallback();
		}
		// 如果鼠標在按住狀態
		if (this.mousePressStatus) 
		{
			// 觸發移動回調函數
			if(this.moveCallback != null) this.moveCallback(new Vector2(Input.GetAxis ("Mouse X"), Input.GetAxis ("Mouse Y")));
		}
		// 鼠標滾輪拉近拉遠
		this.scrollDistance = Input.GetAxis ("Mouse ScrollWheel");
		// 觸發縮放回調函數
		if (this.scrollDistance != 0f && this.scaleCallback != null) this.scaleCallback(this.scrollDistance);

		// 觸發每幀執行更新
		if (this.updateCallback != null) this.updateCallback ();
	}
}

using UnityEngine;
using System.Collections;

/// <summary>
/// 觸碰控制器
/// </summary>
public class TouchController : PlatformController 
{
	/// <summary>
	/// 修正比例
	/// </summary>
	private float rate = 50f;

	/// <summary>
	/// 觸點一
	/// </summary>
	private Touch oneTouch;
	
	/// <summary>
	/// 觸點二
	/// </summary>
	private Touch twoTouch;
	
	/// <summary>
	/// 最後一次縮放距離
	/// </summary>
	private float lastScaleDistance;
	
	/// <summary>
	/// 當前縮放距離
	/// </summary>
	private float scaleDistance;

	void Update()
	{
		// 如果只有一個觸點
		if (Input.touchCount == 1) 
		{
			this.oneTouch = Input.touches[0];
			// 觸點開始
			if(this.oneTouch.phase == TouchPhase.Began)
			{
				// 觸發開始回調函數
				if(this.beginCallback != null) this.beginCallback();
			}
			// 觸點移動
			else if(oneTouch.phase == TouchPhase.Moved)
			{
				// 觸發移動回調函數
				if(this.moveCallback != null) this.moveCallback(new Vector2(this.oneTouch.deltaPosition.x, this.oneTouch.deltaPosition.y) / this.rate);
			}
			// 觸點結束
			else if(oneTouch.phase == TouchPhase.Ended)
			{
				// 觸發結束回調函數
				if(this.endCallback != null) this.endCallback();
			}
		}
		// 如果有多個觸點
		if(Input.touchCount > 1)
		{
			this.oneTouch = Input.touches[0];
			this.twoTouch = Input.touches[1];
			// 如果是縮放
			if(oneTouch.phase == TouchPhase.Moved && twoTouch.phase == TouchPhase.Moved)
			{
				this.scaleDistance = Vector2.Distance(this.oneTouch.position, this.twoTouch.position);
				// 觸發縮放回調函數
				this.scaleCallback((this.scaleDistance - this.lastScaleDistance) / this.rate);
				this.lastScaleDistance = this.scaleDistance;
			}
		}
		// 觸發每幀執行更新
		if (this.updateCallback != null) this.updateCallback ();
	}
}