使用iText进行多行标记注释 [英] Multiline markup annotations with iText

问题描述

我想使用iText突出显示PDF文档中的文本段落。此段落也可以跨越多条线，因此突出显示的区域不一定是一个矩形。
但是对于 PdfAnnotation.createMarkup（...）方法我只能传递或描述一个矩形，而且PDF引用只允许四个 QuadPoints 来描述该区域。

I want to highlight a text passage in a PDF document using iText. This passage can also span across several lines, so the highlighted region is not necessarily one rectangle. But to the PdfAnnotation.createMarkup(...) methods I can only pass or describe one rectangle and also the PDF reference only allows for four QuadPoints to describe the region.

如果我能用一个注释实现这一目标，我将非常高兴。我知道这是可能的，因为我看到了带有多行高亮区域的文档，这些区域在注释列表中显示为单个条目。

I would be very happy if I could achieve this with one single annotation. I know that this is possible, because I have seen documents with multi lined highlighted regions that showed up as one single entry in the annotations list.

推荐答案

PDF规范中的QuadPoints是一个8 * n个元素的数组，其中每组8个元素（x1，y1，x2，y2，x3，y3，x4，y4）定义高亮矩形的4个角。 br />
PdfAnnotation.createMarkup的最后一个参数是一个接受上述值的数组。

The QuadPoints in PDF specification is an array of 8*n elements where each set of 8 elements (x1, y1, x2, y2, x3, y3, x4, y4) defines the 4 corners of a highlighted rectangle.
The last parameter of PdfAnnotation.createMarkup is an array which accepts the values described above.

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