【使用Tikz的Latex节点图】节点图也可以使用tikz环境绘制。
你可以在顶点周围绘制圆, 也可以直接使用它们。用于样式的命令与框图或流程图中的命令不同。绘制顶点的命令由node命名, 绘制边缘的命令由edge命名。
Latex中使用的命令主要来自常用词, 这些词可以在代码中轻松理解和实现。
在开始形状之前, 你需要提及一些环境。你必须仅在以下环境中包括你的文本和命令, 如下所示：
\documentclass[10pt]{article} % you can change the point size according to the requirements\usepackage{xcolor} % package crucial to implement colors\usepackage{tikz} % package used for the tikz\begin{document}\begin{tikzpicture} % tikz environment ....................\end{tikzpicture}\end{document}通过使用x轴和y轴上的点, 可以绘制任何形状。下面给出了使用Tikz的乳胶中使用的常见形状：
- 圈
此处, （1, 1）是x和y轴上的点, 而（1）是圆的半径。
上面的圆圈的输出看起来像下面的图像：
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- 三角形
\path[draw] (2, 2) -- (3, 3)--(4, 2)--cycle;
输出：
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你可以根据需要更改x和y轴的点的位置。
你还可以使用以下命令填充三角形内部的颜色：
\path[fill=green] (2, 2) -- (3, 3) -- (4, 2) -- cycle;
输出：
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要增加三角形的宽度, 可以使用以下命令：
\path[draw, line width=3pt] (2, 2) -- (3, 3)--(4, 2)--cycle;
输出：
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你还可以使用以下命令在三角形内部绘制颜色图案：
\path[clip, draw] (2, 2)--(3, 3)--(4, 2)--cycle;
\path[fill=blue!40] (3, 2.7) circle (.7);
输出：
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你也可以使用任何形状代替三角形。
- 椭圆
\draw[fill=pink] (0, 0)ellipse (30pt and 22pt);
这里, （0, 0）是原点, 而30pt和22pt是绘制椭圆的尺寸。
输出：
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你也可以相应地混合两种颜色。
该示例的命令写为：
\draw[fill=blue!50!white] (0, 0)ellipse (30pt and 22pt);
输出：
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使用这种方法, 你可以根据自己的选择创建任何形状。
让我们从节点图开始。
下面给出了创建简单节点图的代码：
\documentclass{article}\usepackage{tikz}\begin{document}\begin{tikzpicture}[scale=.9, auto=center, every node/.style={circle, fill=blue!20}] % here, node/.style is the style pre-defined, that will be the default layout of all the nodes. You can also create different forms for different nodes.\node (a1) at (1, 2) {1};
\node (a2) at (2, 5){2};
% These all are the points where we want to locate the vertices. You can create your diagram first on a rough paper or graph paper;
then, through the points, you can create the layout. Through the use of paper, it will be effortless for you to draw the diagram on Latex.\node (a3) at (3, 7){3};
\node (a4) at (3, 2.5) {4};
\node (a5) at (5, 6){5};
\node (a6) at (5, 3){6};
\node (a7) at (7, 5){7};
\draw (a1) -- (a2);
% these are the straight lines from one vertex to another\draw (a2) -- (a3);
\draw (a2) -- (a4);
\draw (a4) -- (a6);
\draw (a3) -- (a5);
\draw (a6) -- (a7);
\draw (a5) -- (a7);
\end{tikzpicture}\end{document}输出：
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你还可以将图的边缘弯曲一定角度。
下面给出了创建具有弯曲边缘的节点图的代码：
\documentclass[10pt]{article}\usepackage{color}\usepackage{tikz}% the settings of tikz is used for the optimization of the graphs\usetikzlibrary{shapes, arrows, calc, arrows.meta, fit, positioning} % these are the parameters passed to the library to create the node graphs\tikzset{-Latex, auto, node distance =1.5 cm and 1.3 cm, thick, % node distance is the distance between one node to other, where 1.5cm is the length of the edge between the nodesstate/.style ={ellipse, draw, minimum width = 0.9 cm}, % the minimum width is the width of the ellipse, which is the size of the shape of vertex in the node graphpoint/.style = {circle, draw, inner sep=0.18cm, fill, node contents={}}, bidirected/.style={Latex-Latex, dashed}, % it is the edge having two directionsel/.style = {inner sep=2.5pt, align=right, sloped}}\begin{document}\begin{tikzpicture}% a is the name of the node and A is the text inside the node/vertex\node[state] (a) at (0, 0) {$A$};
% here, state signifies that the shape of the node will be the shape declared in the above state/.style command.% you can mention any location such as right, left, above, below, etc.\node[state] (b) [right =of a] {$B$};
\node[state] (c) [below =of b] {$C$};
\path (a) edge (b);
% it is the path of the edge from one node to another% Bidirected edge\path[bidirected] (a) edge[bend left=60] (b);
% this is the basic command in this code. It is used to draw the curved edge with a certain angle. You can change the angle according to the requirements.\path (a) edge (c);
\path[bidirected] (a) edge[bend right=60] (c);
\draw (b) -- (c);
\end{tikzpicture}\end{document}输出：
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