为距离注释创建度量字典 [英] Creating measure dictionary for distance annotation
问题描述
创建测量距离注释不会显示正确的测量单位，也不会给出正确的计算.知道我做错了哪一部分吗?或者如果有一些数据缺失.
Creating a measure distanced annotation does not display the correct measurement unit, nor gives the correct calculation. Any idea which part I am doing wrong? or if there is some lacking data.
我目前正在创建测量距离注释.使用像素，它工作得很好.但由于现在我正在考虑实际测量和单位，我不确定我的代码的哪一部分有问题，或者我是否缺少某些东西.
I am currently creating a measure distance annotation. Using pixel, it works just fine. but since now i am taking into account actual measurement and unit, i am not sure which part of code i am having problem with or if i am lacking something.
请看图片.这是我用来创建距离注释的一些应用程序，我将其校准为 14.5 厘米，因此通过将其除以像素，每个像素的校准值为 0.0519548.
Please see image. That is some application i use to create a distance annotation and i calibrate it that that distance is 14.5cm so by dividing it by pixel, the calibration value per pixel would be 0.0519548.
现在，当我将它应用到 iText 代码时，我很困惑为什么显示总是以英寸为单位?即使我将代码设置为英寸而不是厘米，计算也是不正确的.
Now, when I apply it to iText code, i am confused why the display is always still in inches? Even if i set my code to be inches and not cm, the calculation is incorrect.
我不完全确定问题是什么.
I am not entirely sure what the problem is.
public class Test {
public static void main(String[] args) throws Exception {
PdfReader reader = new PdfReader("src.pdf");
PdfStamper stamper = new PdfStamper(reader, new FileOutputStream("result.pdf"));
Rectangle location = new Rectangle(55.78125f, 493.875f, 253.59375f, 562.3125f);
PdfDictionary dict = new PdfDictionary();
PdfArray lineEndings = new PdfArray();
lineEndings.add(new PdfName("OpenArrow"));
lineEndings.add(new PdfName("OpenArrow"));
PdfAnnotation stamp = PdfAnnotation.createLine(stamper.getWriter(), location, "test measurement", 55.78125f, 562.3125f, 253.59375f, 493.875f);
stamp.put(new PdfName("LE"), lineEndings);
stamp.put(PdfName.ROTATE, new PdfNumber(0));
stamp.put(PdfName.MEASURE, createMeasureDictionary());
stamp.put(new PdfName("IT"), new PdfName("LineDimension"));
stamp.put(new PdfName("Cap"), new PdfBoolean(true));
stamp.put(PdfName.F, new PdfNumber(516));
stamp.setColor(PdfGraphics2D.prepareColor(Color.RED));
stamper.addAnnotation(stamp, 1);
stamper.close();
reader.close();
}
private static PdfDictionary createMeasureDictionary() {
PdfDictionary measureDictionary = new PdfDictionary(PdfName.MEASURE);
measureDictionary.put(PdfName.R, new PdfString("1 cm = 1 cm"));
PdfDictionary xDictionary = new PdfDictionary(PdfName.NUMBERFORMAT);
xDictionary.put(PdfName.U, new PdfString("cm"));
xDictionary.put(PdfName.C, new PdfNumber(0.0519548f));
measureDictionary.put(PdfName.X, new PdfArray(xDictionary));
PdfDictionary dDictionary = new PdfDictionary(PdfName.NUMBERFORMAT);
dDictionary.put(PdfName.U, new PdfString("cm"));
dDictionary.put(PdfName.C, new PdfNumber(1.0f));
measureDictionary.put(PdfName.D, new PdfArray(dDictionary));
PdfDictionary aDictionary = new PdfDictionary(PdfName.NUMBERFORMAT);
aDictionary.put(PdfName.U, new PdfString("cm"));
aDictionary.put(PdfName.C, new PdfNumber(1.0f));
measureDictionary.put(PdfName.A, new PdfArray(aDictionary));
return measureDictionary;
}
}
@mkl 我会标记你，以防你有空闲时间检查和指导.谢谢.
@mkl im tagging you in case you have free time to check and guide. thank you.
推荐答案
我没有完全理解你的数学.
I do not fully follow your math.
您的行的长度为 ca.209.3 用户空间单位.如果你想让这条线代表 14.5 厘米，X C转换因子应该是 0.069273 而不是你的 0.0519548>.
Your line has a length of ca. 209.3 user space units. If you want that line to represent 14.5 cm, the X Conversion factor should be about 0.069273 and not your 0.0519548.
设置
xDictionary.put(PdfName.C, new PdfNumber(0.069273f));
我得到一个打开时显示的 PDF
I get a PDF which upon opening shows
稍微移动一下(之后 Adobe Reader 重建外观)
and after a slightest move (after which Adobe Reader rebuilds the appearance)
所以没有英寸...
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