`documentclass[tikz]{standalone}
tikzset{xyz/.style={x={(-135:0.5)},y={(1cm,0)},z={(0,1cm)}}}
tikzstyle{every node}=[font=small]
begin{document}
\begin{tikzpicture}[xyz,line width=0.7pt,line join =round,scale=2]
\coordinate(A)at(0,0,0);
\coordinate(B)at(0,1,0);
\coordinate(C)at(-1,1,0);
\coordinate(D)at(-1,0,0);
\coordinate(P)at(0,0,1);
\draw(P)--(A)--(B)--(C)--(P)--(B);
\draw[dashed,line width=0.4pt](P)--(D)--(A) (D)--(C);
\node[shift={(90:5pt)}] at (P){$P$};
\node[shift={(-135:5pt)}] at (A){$A$};
\node[shift={(-45:5pt)}] at (B){$B$};
\node[shift={(0:5pt)}] at (C){$C$};
\node[shift={(180:6pt)}] at (D){$D$};
\end{tikzpicture}
end{document}
`网络上搜到的,知道tikzset命令是调三维视图的,但不理解这些参数的含义。所以这些参数的具体含义是什么呀?谢谢