如何以毫米为单位测量使用 pst-barcode 生成的不干胶标签的条形码/二维码的尺寸 - 例如使用“标签”包时？

Question

如何以毫米为单位指定条形码的尺寸？（使用pst-barcode和labels包装时）

scalex，scaley似乎有效。为什么不是绝对尺寸规格？

\documentclass[a4paper,12pt]{article}
\usepackage[newdimens]{labels}
\usepackage{pst-barcode}
\usepackage{auto-pst-pdf} % require -shell-escape
\LabelCols=4%
\LabelRows=11%
\LeftPageMargin=7mm%
\RightPageMargin=7mm%
\TopPageMargin=15mm%
\BottomPageMargin=2mm%
\InterLabelColumn=0mm%
\InterLabelRow=0mm%
% These four parameters give the extra space used around the text on
% each actual label.
\LeftLabelBorder=4mm%
\RightLabelBorder=4mm%
\TopLabelBorder=4mm%
\BottomLabelBorder=4mm%
\begin{document}

% Specification of 4mm x 4mm seems not respected
\numberoflabels=4
\boxedaddresslabel{
\begin{pspicture}(4,4mm)
\psbarcode{38}{includetext guardwhitespace}{ean2}
%\psbarcode[scalex=0.2,scaley=0.2]{38}{includetext guardwhitespace}{ean2}
\end{pspicture}
}

% Specification of 0.1in x 0.1in seems not respected
\numberoflabels=4
\boxedaddresslabel{
\begin{pspicture}(0.1,0.1in)
\psbarcode{38}{includetext guardwhitespace}{ean2}
%\psbarcode[scalex=0.2,scaley=0.2]{38}{includetext guardwhitespace}{ean2}
\end{pspicture}
}

% but scalex, scaley seems respected
\numberoflabels=36
\boxedaddresslabel{
\begin{pspicture}
\psbarcode[scalex=0.1,scaley=0.1]{38}{includetext guardwhitespace}{ean2}
\end{pspicture}
}

\end{document}

命令行

pdflatex -shell-escape input.tex

笔记：

如果mm不可能或者代码过于复杂，就让它在in。

Answer 1

\begin{pspicture}(0.1,0.1in)没有意义。如果没有单位或前缀，\psset{unit=1in}则始终为 cm。 也一样 \begin{pspicture}(4,4mm)。如果不是默认单位，则必须同时指定两个单位：

\documentclass[a4paper,12pt]{article}
\usepackage[newdimens]{labels}
\usepackage{pst-barcode}
\usepackage{auto-pst-pdf} % require -shell-escape
\LabelCols=4%
\LabelRows=11%
\LeftPageMargin=7mm%
\RightPageMargin=7mm%
\TopPageMargin=15mm%
\BottomPageMargin=2mm%
\InterLabelColumn=0mm%
\InterLabelRow=0mm%
% These four parameters give the extra space used around the text on
% each actual label.
\LeftLabelBorder=4mm%
\RightLabelBorder=4mm%
\TopLabelBorder=4mm%
\BottomLabelBorder=4mm%
\begin{document}
    \numberoflabels=4
    \boxedaddresslabel{%
        \begin{pspicture}(4mm,4mm)
        \psbarcode{38}{height=0.158 includetext guardwhitespace}{ean2}
        \end{pspicture}%
    }

    \numberoflabels=4
    \boxedaddresslabel{%
        \begin{pspicture}(0.1in,0.1in)
        \psbarcode{38}{width=0.1 height=0.1 includetext guardwhitespace}{ean2}
        \end{pspicture}%
    }

\end{document}

height=并 width=在 PostScript 级别使用，并且总是以英寸为单位。4mm=4/25.3 in=0.158in

scalex并scaley在 TeX 级别使用。