Rotate text / Vertical text in itextsharp

问题

I need vertical text or just a way to rotate a ColumnText in ITextSharp.

(It needs to be absolute position)

Until now i have tried a lot of diffrent solution, but with no luck.

Here is a couple of tries:

_cb.SetFontAndSize(BaseFont.CreateFont(), 12f);
_cb.ShowTextAligned(Element.ALIGN_CENTER, "Hello World", 50, 50, 90);

var vt =  new VerticalText(_cb);
vt.SetVerticalLayout(50, 50, 400, 8, 30);            
vt.AddText(new Chunk("asdasd",_sf.ChildBackPageTextOneFont()));
vt.Go();

System.Drawing.Drawing2D.Matrix foo = new System.Drawing.Drawing2D.Matrix();
foo.Rotate(90);
_cb.ConcatCTM(foo);

I have also tried to draw it with System.Drawing.Graphics, but the quality is VERY poor.

Any solution? Thanks.

回答1:

I have tried a lot of methods from the web for this rotate issue. But none of them worked. Finally I figured out a simple solution. Maybe we can do it like this. We can draw a table with no borders, and just with one cell. And we add text in the cell, finally rotate the cell. Every is ok then.

        table = new PdfPTable(1);
        table.TotalWidth = 72;
        paragraph = new Paragraph("123");
        cell = new PdfPCell(paragraph);
        cell.Rotation = 270;
        cell.BorderWidth = 0;
        table.AddCell(cell);
        table.WriteSelectedRows(0, -1, 72, 72, writer.DirectContent);

Besides, the WriteSelectedRows method can position this cell.

回答2:

Actually the easiest way is similar to your first try. You just needed to add a call to BeginText() and EndText() like this

_cb.SetFontAndSize(BaseFont.CreateFont(), 12f);
_cb.BeginText();
_cb.ShowTextAligned(Element.ALIGN_CENTER, "Hello World", 50, 50, 90);
_cb.EndText();
_cb.Stroke();

Here's the documentation for ShowTextAligned

回答3:

Found the answer:

Use something like this:

Imports System.Drawing, System.Drawing.Drawing2D
Dim transf as new Matrix
transf.RotateAt(30,New PointF(100,100), MatrixOrder.Append)
writer.DirectContent.Transform(transf)

transf.Invert()
writer.DirectContent.Transform(transf)

Rotate the canvas, write some text, rotate it back.

来源：https://stackoverflow.com/questions/4389261/rotate-text-vertical-text-in-itextsharp

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itextsharp