简单图形的问题

Question

嘿伙计们，提前感谢你们阅读我的文章。

我制作了一个图形来说明$|z|$。

\documentclass[12pt, a4paper]{book}
\usepackage{tkz-fct}
\usepackage{tikz}
\usepackage{tkz-fct} 
\begin{center}  
\begin{tikzpicture} 
\tkzInit[xmin=-.5, xmax=4, ymin=-.5, ymax=3] 
\tkzDrawXY[noticks,label={}] 
\tkzDefPoint(3,2){z}
\tkzDefPoint(3,0){x} 
\tkzDefPoint(0,2){y} 
\tkzDefPoint(1.5,1){a}
\tkzDrawPoint[fill=black,size=12](z)
\tkzDrawPoint[fill=black,size=12](x)
\tkzDrawPoint[fill=black,size=12](y)
\tkzLabelPoints[right](z) 
\tkzLabelPoints[below](x) 
\tkzLabelPoints[left](y)
\tkzLabelPoints[left](a) 
\draw (z) -- (0,0); 
\draw [dashed] (z) -- (x); 
\draw [dashed] (z) -- (y); 
\end{tikzpicture} 
\end{center}
\end{document}

但\tkzDefPoint(1.5,1){a}我想替换，$|z|$但如果我这样做，我会收到失控参数的错误消息。有什么建议吗？

Answer 1

我很确定你可以用 pure 来做到这一点tkz-euclide，但总是有可能使用 Ti钾Z 是高效的。

\documentclass[12pt, a4paper]{book}
\usepackage{tkz-fct}
\begin{document}
\begin{center}  
\begin{tikzpicture}[bullet/.style={inner sep=3pt,fill,circle}]
\tkzInit[xmin=-.5, xmax=4, ymin=-.5, ymax=3] 
\tkzDrawXY[noticks,label={}] 
\draw (0,0) coordinate (O)
 (3,2) coordinate[bullet,label=above right:$z$] (z)
 (z|-O) coordinate[bullet,label=below:$x$] (x)
 edge[dashed] (z)
 (z-|O) coordinate[bullet,label=left:$y$] (y)
 edge[dashed] (z)
 (O) -- node[sloped,above]{$|z|$} (z);
\end{tikzpicture} 
\end{center}
\end{document}

Answer 2

\documentclass[12pt, a4paper]{book}
\usepackage{tkz-euclide}
\begin{document}
\begin{center}  
\begin{tikzpicture}[bullet/.style={inner sep=3pt,fill,circle}]
\tkzInit[xmin=-.5, xmax=4, ymin=-.5, ymax=3] 
\tkzDrawXY[noticks,label={}] 
\tkzDefPoints{3/0/x,0/2/y,3/2/z,1.5/1/a,0/0/o}
\tkzDefPoint(3,0){x} 
\tkzDrawPoints[fill=black,size=8](x,y,z)
\tkzLabelPoints[right=6pt](z) 
\tkzLabelPoints[below=6pt](x) 
\tkzLabelPoints[left=6pt](y)
\tkzDrawSegments[dashed](x,z y,z)
\tkzDrawSegments(o,z)
\tkzLabelSegment[above,sloped](o,z){$|z|$}
\end{tikzpicture} 
\end{center}
\end{document}

Answer 3

PSTricks 的一个简单用法。

\documentclass[pstricks,border=0.4102020cm,12pt]{standalone}
\usepackage{pst-eucl}
\begin{document}
\pspicture[arrowscale=2,arrowinset=0](-1,-1)(7,6)
    \pnode(0,0){O}
    \pstGeonode[dotscale=2,LabelSep=5mm,PosAngle={-90,45,180}](5,0){x}(5,4){z}(0,4){y}
    \pcline[nodesepA=-0.5,nodesepB=-2]{->}(O)(x)
    \pcline[nodesepA=-0.5,nodesepB=-2]{->}(O)(y)
    \pcline(O)(z)\naput[nrot=:U]{$|z|$}
    \psline[linestyle=dashed](x)(z)(y)
\endpspicture
\end{document}