使用ITweenX 来简化iTween插件的函数调用

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iTween插件是u3d中很火的动画插件。

但是几乎所有函数的参数都是字符串，函数名也要以字符串的方式传入，这就不好了，我们没有必要去记EaseType和其他的参数串。

对于  设计模式的要求是  多组合，少继承。多扩展，少修改。

由于这个插件本身的功能没有任何问题。所以我们没有必要做任何徒劳的重构。就是扩展就玩了呗。

使用：

把脚本放进Standard Assets/Scripts 等等文件夹中即可; 这也很容易被javascript 或 Boo语言使用. 如果你声明一个 public 的EaseType类型变量, 你能够很容易的设置easetype 在面板 inspector. 上。

例子，随便调用一个方法：

public class MyClass: MonoBehaviour
{
	public EaseType easeType;
 
	void Start()
	{
		iTween.ValueTo( gameObject, iTween.Hash( iTweenX.from, 0f, iTweenX.to, 1f, iTweenX.time, 1f,
                                                 iTweenX.onUpdate, "OnUpdateValue",
                                                 iTweenX.onStart, "OnStart",
                                                 iTweenX.onComplete, "OnComplete",
                                                 iTweenX.easeType, iTweenX.Ease(easeType),
                                                 iTweenX.ignoreTimescale, true ) );
	}
	void OnUpdateValue(float value){ print( "OnUpdateValue : " + value.ToString() ); }
	void OnStart(){ print( "OnStart" ); }
	void OnComplete(){ print( "OnComplete" ); }
}

iTweenX.cs 

public enum EaseType
{
	EaseInQuad = 0,
	EaseOutQuad,
	EaseInOutQuad,
	EaseInCubic,
	EaseOutCubic,
	EaseInOutCubic,
	EaseInQuart,
	EaseOutQuart,
	EaseInOutQuart,
	EaseInQuint,
	EaseOutQuint,
	EaseInOutQuint,
	EaseInSine,
	EaseOutSine,
	EaseInOutSine,
	EaseInExpo,
	EaseOutExpo,
	EaseInOutExpo,
	EaseInCirc,
	EaseOutCirc,
	EaseInOutCirc,
	Linear,
	Spring,
	EaseInBounce,
	EaseOutBounce,
	EaseInOutBounce,
	EaseInBack,
	EaseOutBack,
	EaseInOutBack,
	EaseInElastic,
	EaseOutElastic,
	EaseInOutElastic
}
 
public static class iTweenX
{
	public readonly static string[] easeTypes = new string[32]
	{
		"easeInQuad",
		"easeOutQuad",
		"easeInOutQuad",
		"easeInCubic",
		"easeOutCubic",
		"easeInOutCubic",
		"easeInQuart",
		"easeOutQuart",
		"easeInOutQuart",
		"easeInQuint",
		"easeOutQuint",
		"easeInOutQuint",
		"easeInSine",
		"easeOutSine",
		"easeInOutSine",
		"easeInExpo",
		"easeOutExpo",
		"easeInOutExpo",
		"easeInCirc",
		"easeOutCirc",
		"easeInOutCirc",
		"linear",
		"spring",
		"easeInBounce",
		"easeOutBounce",
		"easeInOutBounce",
		"easeInBack",
		"easeOutBack",
		"easeInOutBack",
		"easeInElastic",
		"easeOutElastic",
		"easeInOutElastic"
	};
 
	public const string time =		"time";
	public const string speed =		"speed";
	public const string from =		"from";
	public const string to =		"to";
	public const string onStart =          	"onstart";
	public const string onStartTarget =	"onstarttarget";
	public const string onStartParams =	"onstartparams";
	public const string onUpdate =		"onupdate";
	public const string onUpdateTarget =	"onupdatetarget";
	public const string onUpdateParams =	"onupdateparams";
	public const string onComplete =	"oncomplete";
	public const string onCompleteTarget =	"oncompletetarget";
	public const string onCompleteParams =	"oncompleteparams";
	public const string ignoreTimescale =	"ignoretimescale";
	public const string easeType =		"easetype";
 
	public static string Ease( EaseType type )
	{
		return easeTypes[ (int)type ];
	}
}