学习 tkz-euclide 并遇到奇怪的错误

Question

我在 Windows 上使用 mikTeX，想制作一些指南针和尺子结构的图形。所以我想使用 tkz-euclide。一个最小的工作示例如下：

\documentclass{standalone}  
\usepackage[utf8]{inputenc}  
\usepackage[T1]{fontenc}   
\usepackage[usenames,dvipsnames]{xcolor}   
\usepackage{lmodern}   
\usepackage{tkz-euclide,tkz-fct}    
\usetkzobj{all}  \usetikzlibrary{calc,shapes,decorations}  

\begin{document}
\begin{tikzpicture}[scale=1.0]
       \tkzDefPoint(0,0){C}
       \tkzDefPoint(4,5){A}
       \tkzDefPoint(4,-1){B}
       \tkzDrawLine[add=0 and 0.4](C,A)
       \tkzDrawLine[add=0 and 0.4](C,B)
       \tkzDrawArc[R,ultra thin,blue!50](B,3cm)(60,120)
       \tkzDrawArc[R,ultra thin,blue!50](A,3cm)(240,300)
       \tkzDefMidPoint(A,B) \tkzGetPoint{P}
       \tkzDrawLine[add=0 and 0.5](C,P)
       \tkzDrawPoint[size=5]{P}
       % og nå tegne normalen fra P:
       \tkzLabelPoints(A,B,C,P)
       \tkzDefLine[perpendicular=through P](C,P) \tkzGetPoint{F}
       \tkzDrawLine[add=0.5 and 0.5](P,F)
       \tkzShowLine[perpendicular=through P,size=2,orange,gap=3](C,P)
     \end{tikzpicture}
\end{document}

运行此程序（使用 emacs 和 auctex）得到：

ERROR: Package pgfkeys Error: I do not know the key '/drawpoint/B' and I am going to ignore it. Perhaps you misspelled it.

--- TeX said ---
--- HELP ---
No help available

由于手册是法语的，所以我有点看不懂……

Answer 1

错误似乎来自 的参数\tkzDrawPoint，它不应该在 之间{}，而应该在 之间()。通过此修改，代码可以编译。我删除了usenames的选项xcolor，因为它已经过时了：

\documentclass{standalone}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage[dvipsnames]{xcolor}
\usepackage{lmodern}
\usepackage{tkz-euclide,tkz-fct}
\usetkzobj{all} \usetikzlibrary{calc,shapes,decorations}

\begin{document}

\begin{tikzpicture}[scale=1.0]
  \tkzDefPoint(0,0){C}
  \tkzDefPoint(4,5){A}
  \tkzDefPoint(4,-1){B}
  \tkzDrawLine[add=0 and 0.4](C,A)
  \tkzDrawLine[add=0 and 0.4](C,B)
  \tkzDrawArc[R,ultra thin,blue!50](B,3cm)(60,120)
  \tkzDrawArc[R,ultra thin,blue!50](A,3cm)(240,300)
  \tkzDefMidPoint(A,B) \tkzGetPoint{P}
  \tkzDrawLine[add=0 and 0.5](C,P)
  \tkzDrawPoint[size=5](P)%{P}
  % og nå tegne normalen fra P:
  \tkzLabelPoints(A,B,C,P)
  \tkzDefLine[perpendicular=through P](C,P) \tkzGetPoint{F}
  \tkzDrawLine[add=0.5 and 0.5](P,F)
  \tkzShowLine[perpendicular=through P,size=2,orange,gap=3](C,P)
\end{tikzpicture}

\end{document}