如何在 ConTeXt 中从 tikz 图形创建符号？

Question

我已使用 TikZ 图形使用以下代码成功绘制了一个符号（五边形中的数字）：

this is a very very very very very very very very very long text before symbol%
\starttikzpicture
% draw pentagon
\draw  (90:0.2)  node{}-- (162:0.2) node{}-- (234:0.2) node{}-- (306:0.2) node{}-- (378:0.2) node{}-- cycle;
% draw text inside pentagon
\draw  (0,0) node{10};
\stoptikzpicture%
text after symbol

它确实可以工作，但是图形/符号垂直对齐不佳，并且导致其上方出现巨大的行距，如下所示：

我该如何解决这个问题？有没有比 TikZ 更好的选择来创建这样的符号？

Answer 1

您可以使用baseline键垂直对齐您的 Ti钾Z 符号：

\usemodule[tikz]
\starttext
this is a very very very very very very very very very long text before symbol%
this is a very very very very very very very very very long text before symbol%
\starttikzpicture[baseline=-3pt]
% draw pentagon
\draw  (90:0.2)  node{}-- (162:0.2) node{}-- (234:0.2) node{}-- (306:0.2) node{}-- (378:0.2) node{}-- cycle;
% draw text inside pentagon
\draw  (0,0) node{10};
\stoptikzpicture%
text after symbol
\stoptext

默认 Ti钾Z 将图片的下端放在基线上。如果您从五边形中删除所有节点，并从保存 10 的节点中删除填充，则可以获得良好的结果，而无需手动将其与键对齐baseline：

\usemodule[tikz]
\starttext
this is a very very very very very very very very very long text before symbol%
this is a very very very very very very very very very long text before symbol%
\starttikzpicture
% draw pentagon
\draw  (90:0.2)  -- (162:0.2) -- (234:0.2) -- (306:0.2) -- (378:0.2) -- cycle;
% draw text inside pentagon
\draw  (0,0) node[inner sep=0pt]{10};
\stoptikzpicture%
text after symbol
\stoptext

Answer 2

除了 TikZ，您还可以使用 MetaFun，它可以很好地与 ConTeXt 集成，并且比 TikZ 快几个数量级。

\startuniqueMPgraphic{pentagon}
R := 2 / (1 + sqrt(5)) * max(OverlayWidth, OverlayHeight) ;
draw (0, R) for i = 1 upto 4:
    -- (R * cosd(90 + i*72), R * sind(90 + i*72))
endfor -- cycle ;
setbounds currentpicture to fullsquare xyscaled(OverlayWidth, OverlayHeight) ;
\stopuniqueMPgraphic

\defineoverlay
    [pentagon]
    [\uniqueMPgraphic{pentagon}]

\defineframed
    [pentagonframed]
    [background=pentagon,
     frame=off,
     location=low]

\starttext

\samplefile{lorem}%
\pentagonframed{10}
\samplefile{lorem}%

\stoptext