About named graphs: for *Higman-Sims Graph* thanks to Paul R. Hafner, but I'm not satisfied with
the image of the composite results. For *Dipole Graph* I had to think long time.
The *Hoffman Singleton Graph* would need to be combed. The stupid image of *Hypergraph*
is very famous. Why? The *Hall-janko Graph* is drawn with ugly colors, but I do not know how to improve it.
And about my picture of *Foster Graph*? Silence is better than unmeaning words...

About coloring: most pictures are brute force search. Complete coloring of *Clebsh Graph* (each color
appear exactly twice!) and *Fractional Coloring* are masterpieces.
Counterexamples and enumeative examples are difficult to show (i.e. *Strong Coloring*, *Friend
Theorem*). The *Harmonious Coloring* sample graph seems trivial, but try to improve it (if you can)!

*Local mclaughlin graph*: one of the worst pictures I've drawn. complete source code here.

*Chang graphs*. In the first try of this images I have used
nauty
for finding symmetric draws. But the Chang's graphs are very asimmetric and a good
symmetric dwawing does not exist.
In the second try I show the graph's construction from T8.

### Gallery

Centrality - SVG File - Dirty C++ source code | |

Vertex Critical Graph example, Many thanks to Gordon Royles for the graph. | |

Polygon-Circle Graph - SVG File | |

Random Geometric Graph - SVG File | |

Rectilinear Minimum Spanning Tree - SVG FILE | |

Urquhart Graph - SVG File | |

Exact Coloring - SVG File | |

Generalized Quadrangle (2,4) - SVG File | |

J5 Circular Color - SVG File | |

M22 Graph SVG File | |

Schlafli Graph - Schlafli_graph.svg - schlafli_graph.c++ source code | |

Graph Star Coloring - Graph_star_coloring.svg | |

Local MC Laughlin Graph - Local_mclaughlin_graph.svg - local_mclaughlin_graph.c++ source code | |

Chang's Graphs - Chang_graphs.svg | |

Acyclic Coloring - Acyclic_coloring.svg | |

Art Gallery Problem - Art_gallery_problem.svg | |

Cocoloring - Cocoloring.svg | |

Complete Coloring of Clebsch Graph - Complete_coloring_clebsch_graph.svg | |

Foster Graph - Foster_graph.svg | |

Graph Betweenness - Graph_betweenness.svg | |

Gq21 Strong Coloring - Strong_coloring_sample.svg | |

Graph Fractional Coloring - Graph_fractional_coloring.svg | |

Hall-Janko Graph - Hall_janko_graph.svg | |

Harmonious Coloring of a Tree - Harmonious_coloring_tree.svg | |

Higman-Sims Graph - Higman_Sims_Graph.svg - hygman_sysm source code | |

Higman-Sims Graph (split int Parts) - Higman_Sims_Graph_Parts.svg | |

Sample of Strong Coloring | |

Total Coloring of Foster Cage - Total_coloring_foster_cage.svg | |

Visibility Polygon - Visibility_polygon.svg | |

Complement Graph Sample | |

Friends Theorem | |

Hypergraph | |

Intersection Graph | |

Sample of Kautz Graph | |

Sample of Toroidal Graph | |

Exact Coloring of a complete grap | |

Hoffman-Singleton graph | |

The dipole graph | |

Edge coloring of Desargues graph | |

Some 7-simmetry embedding of Gewirtz graph - gewirtz_graph_embeddings.svg | |

Some 19-simmetry embedding of Perkel graph - perkel_graph_embeddings.svg | |

Some embeddings of Brouwer Haemers graph - Brouwer_Haemers_graph.svg - brouwer_haemers_graph.c++ source code |

### Final Notes

The *Kautz Graph* is completely handmade. It seems nice?

Errors and Corrections: Arthena found an error
on *Art Gallery Problem*: great powers of observation! Nicinic found an error on *Toroidal Graph*.

*Schlafli graph*: the construction is easy: below the source code.

*Brouwer Haemers graph*: complete source code of construction and symmetric drawing using
nauty. You can get an idea of what means "using nauty".

Many thanks to Nauty for simmetrycal graph embedding!

Todo: I have in my pocket (for many years) a picture of Null Graph, I do not have the courage to post it on wikicommons. This picture looks a lot like the Invisible Pink Unicorn