ImageMerge

将多张图片合并成一张图片，可用于生成IM即时通讯群组拼接头像。

依赖: System.Drawing.Common

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以下四张网络图片作为源文件。

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（1）2张图片的合并

1.1 Merge2R1形态：

    /// <summary>
    /// 2张图片，上下各1个长方形
    ///  ———————————————————
    /// |                  |
    /// |        R1        |
    /// |                  |
    ///  ———————————————————
    /// |                  |
    /// |        R2        |
    /// |                  |
    ///  ———————————————————
    /// </summary>
    
    MergeProvider.Merge2Images(img1, img2, Merge2LayoutEnum.Merge2R1, 250);

1.2 Merge2R2形态：

    /// <summary>
    /// 2张图片，左右各1个长方形
    ///  ———————————————————
    /// |         |        |
    /// |         |        |
    /// |         |        |
    /// |    R1   |   R2   |
    /// |         |        |
    /// |         |        |
    /// |         |        |
    ///  ———————————————————
    /// </summary>
    
    MergeProvider.Merge2Images(img1, img2, Merge2LayoutEnum.Merge2R2, 250);

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（2）3张图片合并

2.1 Merge1R2S1形态：

    /// <summary>
    /// 3张图片， 上面一个长方形，下面2个正方形并排
    ///  ———————————————————
    /// |                  |
    /// |         R1       |
    /// |                  |
    ///  ———————————————————
    /// |         |        |
    /// |    S1   |   S2   |
    /// |         |        |
    ///  ———————————————————
    /// </summary>
    
    MergeProvider.Merge3Images(img1, img2, img3, Merge3LayoutEnum.Merge1R2S1, 250);

2.2 Merge1R2S2形态：

    /// <summary>
    /// 3张图片，上面2个正方形并排，下面一个长方形
    ///  ———————————————————
    /// |         |        |
    /// |    S1   |   S2   |
    /// |         |        |
    ///  ———————————————————
    /// |                  |
    /// |         R1       |
    /// |                  |
    /// ———————————————————
    /// </summary>
    
    MergeProvider.Merge3Images(img1, img2, img3, Merge3LayoutEnum.Merge1R2S2, 250);

2.3 Merge1R2S3形态：

    /// <summary>
    /// 3张图片，上面2个正方形并排，下面一个长方形
    ///  ———————————————————
    /// |         |        |
    /// |         |    S1  |
    /// |         |        |
    /// |    R1   |—————————
    /// |         |        |
    /// |         |    S2  |
    /// |         |        |
    ///  ———————————————————
    /// </summary>

    MergeProvider.Merge3Images(img1, img2, img3, Merge3LayoutEnum.Merge1R2S3, 250);

2.3 Merge1R2S4形态：

    /// <summary>
    /// 3张图片，上面2个正方形并排，下面一个长方形
    ///  ———————————————————
    /// |         |        |
    /// |    S2   |        |
    /// |         |        |
    /// |—————————|    R1  |
    /// |         |        |
    /// |    S2   |        |
    /// |         |        |
    ///  ———————————————————
    /// </summary>
    
    MergeProvider.Merge3Images(img1, img2, img3, Merge3LayoutEnum.Merge1R2S4, 250);

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（3）4张图片合并

3.1 Merge4S形态：

    /// <summary>
    /// 4张图片，上面一个长方形，下面2个正方形并排
    ///  ———————————————————
    /// |         |        |
    /// |    S1   |   S2   |
    /// |         |        |
    ///  ———————————————————
    /// |         |        |
    /// |    S3   |   S4   |
    /// |         |        |
    ///  ———————————————————
    /// </summary>
    
    MergeProvider.Merge4Images(img1, img2, img3, img4, Merge4LayoutEnum.Merge4S, 250);