Shader for sprite clipping

Unity3D - Shader for sprite clipping
http://*.com/questions/23165899/unity3d-shader-for-sprite-clipping

Shader "Sprites/ClipArea"
{
Properties
{
    _MainTex ("Base (RGB), Alpha (A)", 2D) = "white" {}
    _Length ("Length", Range(0.0, 1.0)) = 1.0
    _Width ("Width", Range(0.0, 1.0)) = 0.5
 }

SubShader
{
    LOD 200

    Tags
    {
        "Queue" = "Transparent"
        "IgnoreProjector" = "True"
        "RenderType" = "Transparent"
    }

    Pass
    {
        Cull Off
        Lighting Off
        ZWrite Off
        Offset -1, -1
        Fog { Mode Off }
        ColorMask RGB
        Blend SrcAlpha OneMinusSrcAlpha

        CGPROGRAM
        #pragma vertex vert
        #pragma fragment frag

        #include "UnityCG.cginc"

        sampler2D _MainTex;
        float4 _MainTex_ST;
        float _Length;
        float _Width;

        struct appdata_t
        {
            float4 vertex : POSITION;
            float2 texcoord : TEXCOORD0;
        };

        struct v2f
        {
            float4 vertex : POSITION;
            float2 texcoord : TEXCOORD0;
        };

        v2f vert (appdata_t v)
        {
            v2f o;
            o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
            o.texcoord = v.texcoord;
            return o;
        }

        half4 frag (v2f IN) : COLOR
        {
            if ((IN.texcoord.x<0) || (IN.texcoord.x>_Width) || (IN.texcoord.y<0) || (IN.texcoord.y>_Length))

            {
                half4 colorTransparent = half4(0,0,0,0) ;
                return  colorTransparent ;
            }
            return tex2D(_MainTex, IN.texcoord);
        }
        ENDCG
    }
}
}

Shader "Sprites/ClipArea"
{
    Properties
    {
        _MainTex ("Base (RGB), Alpha (A)", 2D) = "white" {}
        _Fill ("Fill", Range(0.0, 1.0)) = 1.0
        _MinX ("MinX", Float) = 0
        _MaxX ("MaxX", Float) = 1
     }

    SubShader
    {
        LOD 200

        Tags
        {
            "Queue" = "Transparent"
            "IgnoreProjector" = "True"
            "RenderType" = "Transparent"
        }

        Pass
        {
            Cull Off
            Lighting Off
            ZWrite Off
            Offset -1, -1
            Fog { Mode Off }
            ColorMask RGB
            Blend SrcAlpha OneMinusSrcAlpha

            CGPROGRAM
            #pragma vertex vert
            #pragma fragment frag

            #include "UnityCG.cginc"

            sampler2D _MainTex;
            float4 _MainTex_ST;
            float _MinX;
            float _MaxX;
            float _Fill;

            struct appdata_t
            {
                float4 vertex : POSITION;
                float2 texcoord : TEXCOORD0;
            };

            struct v2f
            {
                float4 vertex : POSITION;
                float2 texcoord : TEXCOORD0;
            };

            v2f vert (appdata_t v)
            {
                v2f o;
                o.vertex = mul(UNITY_MATRIX_MVP, v.vertex);
                o.texcoord = v.texcoord;
                return o;
            }

            half4 frag (v2f IN) : COLOR
            {
            if ((IN.texcoord.x<_MinX)|| (IN.texcoord.x>(_MinX+_Fill*(_MaxX-_MinX))))
                {
                    half4 colorTransparent = half4(0,0,0,0) ;
                    return  colorTransparent ;
                }
                return tex2D(_MainTex, IN.texcoord);
            }
            ENDCG
        }
    }
}