Graphviz note

有向圖 Digraph

Edges style

Subgraphs

Attributes

graph

• label="My Graph";Label a graph itself
• rankdir=LR;Lay the graph out from Left to Right, instead of Top to Bottom
• {rank=same; a, b, c }Group nodes together at the same level of a graph
• splines="line";Force edges to be straight, no curves or angles
• K=0.6;Used to influence the 'spring' used in the layout, Can be used to push nodes further apart, which is especially useful for twopi and sfdp layouts

vertex

• [label="Some Label"]Labels the Vertex
• [color="red"]Colors the Vertex
• [fillcolor="blue"]Fills the Vertex with the specified colour

dege

• [label="Some Label"]Labels the Edge (Useful for Weights)
• [color="red"]Colors the Vertex (Useful for Paths)
• [penwidth=2.0]Adjusts the thickness of the edge line, Very useful for Paths

References

1. GraphViz Pocket Reference

Playground

$$f(x)=\{\begin{array}{ll}\frac{x^2-x}{x},& \text{if }x\ge 1\\ 0,& \text{otherwise}\end{array}$$