itextsharp将点数转换为cm [英] itextsharp convert points to cm

问题描述

我正在使用 iTextsharp - 一个java pdf lib - 动态生成pdfs。
现在据我所知，测量以点数表示。我知道在哪里放置厘米的地方。
所以我需要转换：
points< - > cm

I am using iTextsharp - a java pdf lib - to generate pdfs dynamically. Now as I understood it, measurements are specified in points. I know where to place what on the place in cm. so I need the conversion: points <-> cm

推荐答案

iText（夏普）有a 实用程序类（包 com.itextpdf.text / namespace iTextSharp.text ）包含几种静态转换方法，特别是：

iText(Sharp) has a Utilities class (package com.itextpdf.text / namespace iTextSharp.text) which contains several static conversion methods, in particular:

// iText
public static final float millimetersToPoints(final float value);
public static final float millimetersToInches(final float value);
public static final float pointsToMillimeters(final float value);
public static final float pointsToInches(final float value);
public static final float inchesToMillimeters(final float value);
public static final float inchesToPoints(final float value);

// iTextSharp
public static float MillimetersToPoints(float value);
public static float MillimetersToInches(float value);
public static float PointsToMillimeters(float value);
public static float PointsToInches(float value);
public static float InchesToMillimeters(float value);
public static float InchesToPoints(float value);

您假设测量以点数指定只是部分正确但在你的用例动态生成pdfs 这已经足够了。

Your assumption that measurements are specified in points is only partially correct but in your use case to generate pdfs dynamically that's good enough.

一般情况下，测量是以用户空间单位指定的，默认用户空间单位（即在任何转换到位之前）可以在每页的基础上配置为1/72英寸的任何浮动倍数（受特定于实现的限制）：

In general, though, measurements are specified in user space units, and the default user space unit (i.e. before any transformations are in place) can be configured on a per-page basis to be any float multiple (subject to implementation specific limitations) of 1/72 inch:

UserUnit
number
（可选; PDF 1.6）正数这将给出默认用户空间单位的大小，为1/72英寸的倍数。支持值的范围应取决于实现。

UserUnit number (Optional; PDF 1.6) A positive number that shall give the size of default user space units, in multiples of 1⁄72 inch. The range of supported values shall be implementation-dependent.

默认值：1.0（用户空间单位为1/72英寸）。

Default value: 1.0 (user space unit is 1⁄72 inch).

（表30，第7.7.3.3节，ISO 32000-1）

由于该默认值，您的假设成立如果没有其他选择。

Due to that default your assumption holds if nothing else is selected.

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