英文:
How to create rectangle vertically and add text to it in PDF using itext 2.1.7
问题
我的要求很简单，我想在PDF的所有页面上创建一个垂直定位的矩形，并从底部向上方向添加文本（基本上是一个90度的框）。
我尝试使用以下代码片段来实现，但我希望它被包含在特定尺寸的框内，而使用这种“ColumnText”方法无法控制该尺寸。
例如：
ColumnText.showTextAligned(canvas，PdfContentByte.ALIGN_LEFT，note，
.03F * pageWidth，.68F * pageHeight，90）；
英文:
My requirement is straight, I want to create a rectangle positioned vertically and add text to it starting from bottom to going upward direction. (basically 90 degree box) in all pages of PDF
I tried achieving it using below code snap, but I want it to be enclosed within a specific dimension of box, which I cant control using this ColumnText approach
for example:
ColumnText.showTextAligned(canvas, PdfContentByte.ALIGN_LEFT, note,
.03F * pageWidth, .68F * pageHeight, 90);
答案1
得分: 1
对于类似你的任务，ColumnText 的静态便利方法是不够的，你需要实际创建并为一个完整的 ColumnText 实例设置参数。
例如像这样：
float width = Utilities.millimetersToPoints(10);
float height = Utilities.millimetersToPoints(100);
float x = Utilities.millimetersToPoints(15);
float y = Utilities.millimetersToPoints(150);
float fontHeight = Utilities.millimetersToPoints(4);
String content = "Some text to fill the box. There's nothing really to say, just a box to fill. So let's fill the box.";
PdfReader reader = new PdfReader(YOUR_SOURCE_FILE);
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(new File(RESULT_FOLDER, "RotatedBoxForAbbas.pdf")));
Rectangle cropBox = reader.getCropBox(1);
PdfContentByte canvas = stamper.getOverContent(1);
canvas.concatCTM(0, 1, -1, 0, cropBox.getLeft() + x + width, cropBox.getBottom() + y);
canvas.rectangle(0, 0, height, width);
canvas.stroke();
ColumnText columnText = new ColumnText(canvas);
columnText.addText(new Chunk(content, new Font(FontFamily.HELVETICA, fontHeight)));
columnText.setLeading(fontHeight);
columnText.setSimpleColumn(2, 0, height - 4, width);
columnText.go();
stamper.close();
(AddTextBox 测试 testRotatedBoxForAbbas)
(虽然此测试是为 iText 5 创建的，但在适应导入包后，它应该与 iText 2.1.7 和 OpenPdf 相同。)
你在这个问题中没有提到尺寸，但在你之前删除的问题中提到了以毫米为单位给出的尺寸，所以我在这里也使用了毫米。
在空白的源页面上的结果：
英文:
For a task like yours the static convenience methods of ColumnText don't suffice, you need to actually create and parameterize a full ColumnText instance.
For example like this:
float width = Utilities.millimetersToPoints(10);
float height = Utilities.millimetersToPoints(100);
float x = Utilities.millimetersToPoints(15);
float y = Utilities.millimetersToPoints(150);
float fontHeight = Utilities.millimetersToPoints(4);
String content = "Some text to fill the box. There's nothing really to say, just a box to fill. So let's fill the box.";
PdfReader reader = new PdfReader(YOUR_SOURCE_FILE);
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(new File(RESULT_FOLDER, "RotatedBoxForAbbas.pdf")));
Rectangle cropBox = reader.getCropBox(1);
PdfContentByte canvas = stamper.getOverContent(1);
canvas.concatCTM(0, 1, -1, 0, cropBox.getLeft() + x + width, cropBox.getBottom() + y);
canvas.rectangle(0, 0, height, width);
canvas.stroke();
ColumnText columnText = new ColumnText(canvas);
columnText.addText(new Chunk(content, new Font(FontFamily.HELVETICA, fontHeight)));
columnText.setLeading(fontHeight);
columnText.setSimpleColumn(2, 0, height - 4, width);
columnText.go();
stamper.close();
(AddTextBox test testRotatedBoxForAbbas)
<sup>(While this test has been created for iText 5, it should work identically with iText 2.1.7 and OpenPdf after adapting the import packages.)</sup>
You didn't mention dimensions in this question but in your previous, removed one you mentioned dimensions given in mm, so I also used millimeters here.
The result on an empty source page:
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