无法获取填写 PDFBox 的路径

Question

我正在使用 PDF 框尝试创建一些具有弯曲边缘的矩形。在最终弄清楚如何使用贝塞尔曲线之后，我能够得到我喜欢的形状。我现在的问题是我不知道如何填写它。我试过在随机点关闭路径，仅使用贝塞尔曲线绘制形状，在随机点抚摸路径，在随机点关闭路径，但它仍然不会填满整个东西。它似乎只填充曲线的圆形边缘。谁能让我知道我做错了什么？非常感谢。 generator 是我用来获取页面中当前设置的水平和垂直位置的对象。本例中水平和垂直位置值不变（水平位置为 200，垂直位置为 240）。这是我正在使用的代码（抱歉其中的神奇数字）

这是 PDF 页面中生成的图像，由于某种原因无法填充：

//Creating PDF document object 
PDDocument document = new PDDocument(); 
//Creating the PDDocumentInformation object 
PDDocumentInformation pdd = document.getDocumentInformation();
generator.drawRectangleWithCurvedBorders(200, 400, cs, generator);



public void drawRectangleWithCurvedBorders(int width, int height, PDPageContentStream contentStream, XClass generator) throws IOException
    {
        contentStream.setStrokingColor( Color.BLACK );
        contentStream.setNonStrokingColor( Color.BLACK );

        // bottom of rectangle
        contentStream.moveTo(generator.getHorizontalPosition() - 0.5f, generator.getVerticalPosition() );
        contentStream.lineTo(generator.getHorizontalPosition() + width + 0.5f, generator.getVerticalPosition() );
        contentStream.moveTo(generator.getHorizontalPosition() + width, generator.getVerticalPosition() );

        contentStream.curveTo(generator.getHorizontalPosition() + width + 5.9f, generator.getVerticalPosition() + 0.14f,
                              generator.getHorizontalPosition() + width + 11.06f, generator.getVerticalPosition() + 5.16f,
                              generator.getHorizontalPosition() + width + 10.96f, generator.getVerticalPosition() + 10);

        // left of rectangle
        contentStream.moveTo(generator.getHorizontalPosition(), generator.getVerticalPosition() );
        contentStream.curveTo(generator.getHorizontalPosition() - 5.9f, generator.getVerticalPosition() + 0.14f,
                              generator.getHorizontalPosition() - 11.06f, generator.getVerticalPosition() + 5.16f,
                              generator.getHorizontalPosition() - 10.96f, generator.getVerticalPosition() + 10);
        contentStream.moveTo(generator.getHorizontalPosition() - 10.96f, generator.getVerticalPosition() + 10 - 0.5f);
        contentStream.lineTo(generator.getHorizontalPosition() - 10.96f, generator.getVerticalPosition() + height + 0.5f );


        // right of rectangle       
        contentStream.moveTo(generator.getHorizontalPosition() + width + 10.96f, generator.getVerticalPosition() + 10 - 0.5f);
        contentStream.lineTo(generator.getHorizontalPosition() + width + 10.96f, generator.getVerticalPosition() + height + 0.5f);
        contentStream.moveTo(generator.getHorizontalPosition() + width, generator.getVerticalPosition() + height + 10);
        contentStream.curveTo(generator.getHorizontalPosition() + width + 5.9f, generator.getVerticalPosition() + height + 0.14f + 10,
                  generator.getHorizontalPosition() + width + 11.06f, generator.getVerticalPosition() + height - 5.16f + 10,
                  generator.getHorizontalPosition() + width + 10.96f, generator.getVerticalPosition() + height);

        // top of rectangle
        contentStream.moveTo(generator.getHorizontalPosition() + width + 0.5f, generator.getVerticalPosition() + height + 10);
        contentStream.lineTo(generator.getHorizontalPosition() - 0.5f, generator.getVerticalPosition() + height + 10);
        contentStream.moveTo(generator.getHorizontalPosition(), generator.getVerticalPosition() + height + 10);
        contentStream.curveTo(generator.getHorizontalPosition() - 5.9f, generator.getVerticalPosition() + height + 0.14f + 10,
                  generator.getHorizontalPosition() - 11.06f, generator.getVerticalPosition() + height - 5.16f + 10,
                  generator.getHorizontalPosition() - 10.96f, generator.getVerticalPosition() + height);

        contentStream.closePath();
        contentStream.fill();
    }

Answer 1

正如 Tilman 在对该问题的评论中所说的那样，问题在于许多 moveTo() 指令。事实上，每个 moveTo 开始一个新的子路径，每个子路径都意味着一个单独的填充区域。根据填充变体和子路径方向，这些子路径的交叉点实际上可能 被排除 被填充。

因此，要创建一个具有 弯曲边框 的填充矩形，如 OP 所述，应该重新排列路径构建说明，以便它们勾勒出没有 moveTo 中断流程，例如像这样：

try (   PDDocument document = new PDDocument()  ) {
    PDPage page = new PDPage();
    document.addPage(page);
    try (   PDPageContentStream contentStream = new PDPageContentStream(document, page)    ) {
        float x = 100;
        float y = 100;
        float width = 200;
        float height = 300;

        contentStream.setStrokingColor( Color.BLACK );
        contentStream.setNonStrokingColor( Color.BLACK );

        contentStream.moveTo(x, y);

        // bottom of rectangle, left to right
        contentStream.lineTo(x + width, y );
        contentStream.curveTo(x + width + 5.9f, y + 0.14f,
                x + width + 11.06f, y + 5.16f,
                x + width + 10.96f, y + 10);

        // right of rectangle, bottom to top
        contentStream.lineTo(x + width + 10.96f, y + height);
        contentStream.curveTo(x + width + 11.06f, y + height - 5.16f + 10,
                x + width + 5.9f, y + height + 0.14f + 10,
                x + width, y + height + 10);

        // top of rectangle, right to left
        contentStream.lineTo(x, y + height + 10);
        contentStream.curveTo(x - 5.9f, y + height + 0.14f + 10,
                x - 11.06f, y + height - 5.16f + 10,
                x - 10.96f, y + height);

        // left of rectangle, top to bottom
        contentStream.lineTo(x - 10.96f, y + 10);
        contentStream.curveTo(x - 11.06f, y + 5.16f,
                x - 5.9f, y + 0.14f,
                x, y);

        contentStream.closePath();
        contentStream.fill();
    }
    document.save(new File("CurvedBorderRectangleLikeMaht33n-improved.pdf"));
}

(CurvedBorderRectangle 测试 testLikeMaht33nImproved)

（我没有那个 XClass generator 对象，所以我用两个 float 变量 x 和 y 代替。）

结果如愿：

无法获取填写 PDFBox 的路径

Can't Get Path to Fill in PDFBox

java

pdf

pdfbox