绘制 ER 图 - TikZ - Diagram Overflow

Question 1

您有很多选择：

首次使用\resizebox

\documentclass[12pt]{article}
\usepackage{tikz-er2}
\usepackage{pdflscape}    %% helps to see in upright direction in pdf
\usetikzlibrary{shadows,positioning}
\begin{document}
\tikzset{every entity/.style={top color=white,bottom color=blue!30,draw=blue!50!black!100,drop shadow},
        every attribute/.style = {top color=white, bottom color=yellow!20,
                                  draw=yellow, drop shadow},
        every relationship/.style ={top color=white, bottom color=red!20,
                                  draw=red!50!black!100, drop shadow},
        every edge/.style = {link},
        every isa/.style = {top color=white, bottom color=green!20,
                                  draw=green!50!black!100, drop shadow},
        }
\begin{landscape}
\resizebox{!}{0.9\textheight}{\begin{tikzpicture}[node distance=10em]
    \node[entity] (student) {Student};
    \node[isa] (isa1) [below = of student, node distance=5em] {ISA} edge node [auto,swap] {disjoint} (student);
    \node[entity] (mtech-stud) [below left = of isa1] {MTech$-$student} edge (isa1);
    \node[attribute] (btechproj) [below left = of mtech-stud] {No.-of-BTech-Projects} edge (mtech-stud);
    \node[entity] (btech-stud) [below = of isa1] {BTech$-$student} edge (isa1);
    \node[entity] (phd-stud) [below right = of isa1] {Ph.D.$-$student} edge (isa1);
    \node[attribute] (stud-id) [left = of student] {\key{student-id}} edge (student);
    \node[attribute] (name) [above left = of student] {Name} edge (student);
    \node[attribute] (fname) [above left = of name] {First-Name} edge (name);
    \node[attribute] (lname) [above right = of name] {Last-Name} edge (name);
    \node[attribute] (cgpa)  [above right = of student] {CGPA} edge (student);
    \node[relationship] (joins) [right = of student] {joins} edge [total] (student);
    \node[entity] (pgroup) [right = of joins] {Project-Group} edge [<-] (joins);
    \node[attribute] (group-id) [above left = of pgroup] {\key{group-id}} edge (pgroup);
    \node[derived attribute] (group-cgpa) [above right = of group-id] {group-CGPA} edge (pgroup);
    \node[multi attribute] (areas) [above right = of group-cgpa] {areas-of-interest} edge (pgroup);
    \node[relationship] (pgroup-guide) [right = of pgroup] {Project-Group-Guide} edge (pgroup);
\end{tikzpicture}
}
\end{landscape}
\end{document}

其次从包中放入你的tikzpicture内部adjustbox环境：adjustbox

\documentclass[12pt]{article}
\usepackage{tikz-er2}
\usepackage{pdflscape}    %% helps to see in upright direction in pdf
\usepackage{adjustbox}
\usetikzlibrary{shadows,positioning}
\begin{document}
\tikzset{every entity/.style={top color=white,bottom color=blue!30,draw=blue!50!black!100,drop shadow},
        every attribute/.style = {top color=white, bottom color=yellow!20,
                                  draw=yellow, drop shadow},
        every relationship/.style ={top color=white, bottom color=red!20,
                                  draw=red!50!black!100, drop shadow},
        every edge/.style = {link},
        every isa/.style = {top color=white, bottom color=green!20,
                                  draw=green!50!black!100, drop shadow},
        }
\begin{landscape}
\begin{adjustbox}{max height=0.9\textwidth}
\begin{tikzpicture}[node distance=10em]
    \node[entity] (student) {Student};
    \node[isa] (isa1) [below = of student, node distance=5em] {ISA} edge node [auto,swap] {disjoint} (student);
    \node[entity] (mtech-stud) [below left = of isa1] {MTech$-$student} edge (isa1);
    \node[attribute] (btechproj) [below left = of mtech-stud] {No.-of-BTech-Projects} edge (mtech-stud);
    \node[entity] (btech-stud) [below = of isa1] {BTech$-$student} edge (isa1);
    \node[entity] (phd-stud) [below right = of isa1] {Ph.D.$-$student} edge (isa1);
    \node[attribute] (stud-id) [left = of student] {\key{student-id}} edge (student);
    \node[attribute] (name) [above left = of student] {Name} edge (student);
    \node[attribute] (fname) [above left = of name] {First-Name} edge (name);
    \node[attribute] (lname) [above right = of name] {Last-Name} edge (name);
    \node[attribute] (cgpa)  [above right = of student] {CGPA} edge (student);
    \node[relationship] (joins) [right = of student] {joins} edge [total] (student);
    \node[entity] (pgroup) [right = of joins] {Project-Group} edge [<-] (joins);
    \node[attribute] (group-id) [above left = of pgroup] {\key{group-id}} edge (pgroup);
    \node[derived attribute] (group-cgpa) [above right = of group-id] {group-CGPA} edge (pgroup);
    \node[multi attribute] (areas) [above right = of group-cgpa] {areas-of-interest} edge (pgroup);
    \node[relationship] (pgroup-guide) [right = of pgroup] {Project-Group-Guide} edge (pgroup);
\end{tikzpicture}
\end{adjustbox}
\end{landscape}
\end{document}

这里的优点是，只有当图片超过最大高度时，才会调整图片大小0.9\textheight

第三，调整每个节点的距离，而不是像你那样全局地给出一个值。这个留给你自己吧。

请注意，我已将tikzstyles (已弃用) 更改为，tikzset并添加了positioning库并将的所有实例更改of =为= of。

Answer

您有很多选择：