创建用于距离注释的量度字典 [英] Creating measure dictionary for distance annotation
问题描述
创建距离标尺的注释不会显示正确的度量单位，也不会给出正确的计算.知道我哪一部分做错了吗?还是缺少一些数据.
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.
我当前正在创建一个度量距离注释.使用像素，效果很好.但是自从现在以来，我考虑到了实际的尺寸和单位，所以我不确定我在哪一部分代码上有问题，或者我是否缺少某些内容.
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.
请参阅图片.那是我用来创建距离注释的一些应用程序，我将其校准为该距离为14.5cm，因此通过将其除以像素，每个像素的校准值将为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，当我将其应用于iText代码时，我很困惑为什么显示始终始终为英寸?即使我将代码设置为英寸而不是厘米，计算也不正确.
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.
我不确定是什么问题.
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正在为您添加标签，以防您有空闲时间进行检查和指导.谢谢.
@mkl im tagging you in case you have free time to check and guide. thank you.
推荐答案
我没有完全遵循你的数学.
I do not fully follow your math.
您的行的长度约为. 209.3用户空间单位.如果您希望该线代表14.5厘米，则 X C 转换系数应约为 0.069273 ，而不是您的 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PDF，打开时显示
I get a PDF which upon opening shows
并稍作移动(之后Adobe Reader会重建外观)
and after a slightest move (after which Adobe Reader rebuilds the appearance)
所以没有英寸...
这篇关于创建用于距离注释的量度字典的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
