iText - PdfAnnotation.createInk

Question

我想解析XFDF中的注释数据并使用iText库进行绘制。我想绘制附加图像的注释。

以下是我的代码来测试PdfAnnotation.createInk函数，但运行代码后它不工作。

我有谷歌阅读文件，但没有提供太多的信息。任何建议和建议？谢谢！

// step 1 
    Document document = new Document(PageSize.A4); 
    // step 2 
    PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(destFile)); 
    // step 3 
    document.open(); 

    PdfContentByte pcb = new PdfContentByte(writer); 
    pcb.setColorStroke(BaseColor.RED); 
    Rectangle rect = new Rectangle(52.92f, 397.56f, 173.36f, 530.67f); 
    float[][] inkList = {{61.736111f,530.669250f},{61.295139f,525.820984f},{61.295139f,518.768860f}, 
      {61.295139f,505.986969f},{61.295139f,490.560547f},{61.295139f,470.726562f},{59.972221f,452.214844f}, 
      {57.767361f,434.143890f},{56.003471f,418.276703f},{53.357639f,404.172516f},{51.593750f,391.390625f}, 
      {50.711807f,382.134766f},{49.829861f,376.845703f} 
    }; 

    //float inkList[][] = 
    PdfAnnotation an = PdfAnnotation.createInk(writer, rect, "", inkList); 
    an.setPage(1); 
    an.setColor(BaseColor.RED); 
    an.setFlags(PdfAnnotation.FLAGS_PRINT); 

    writer.addAnnotation(an); 
    //Step 5 
    document.close(); 

Answer 1

输出PDF似乎是因为所定义的注释是孤立点的一个单纯的集合不包含注释。

的PdfAnnotation.createInk的float[][]参数对应于墨水注释词典的InkList条目：

InkList阵列（必需）Ñ数组的数组，每个代表一个描边路径。每个 数组应该是 默认用户空间中的一系列交替的水平和垂直坐标，指定沿着路径的点。绘制时， 点应通过直线或曲线以 实现相关的方式连接。

因此，在OPS阵列

float[][] inkList = {{61.736111f,530.669250f},{61.295139f,525.820984f},{61.295139f,518.768860f}, 
     {61.295139f,505.986969f},{61.295139f,490.560547f},{61.295139f,470.726562f},{59.972221f,452.214844f}, 
     {57.767361f,434.143890f},{56.003471f,418.276703f},{53.357639f,404.172516f},{51.593750f,391.390625f}, 
     {50.711807f,382.134766f},{49.829861f,376.845703f} 
}; 

的情况下，我们具有13个通路的每一个仅包含单个点的集合。所以，没有画。

如果我们在单一路径将所有的点，不过，

float[][] inkList = {{61.736111f,530.669250f,61.295139f,525.820984f,61.295139f,518.768860f, 
      61.295139f,505.986969f,61.295139f,490.560547f,61.295139f,470.726562f,59.972221f,452.214844f, 
      57.767361f,434.143890f,56.003471f,418.276703f,53.357639f,404.172516f,51.593750f,391.390625f, 
      50.711807f,382.134766f,49.829861f,376.845703f} 
    }; 

的结果是这样的：

它看起来像“H”的左线问题中的屏幕截图。