Plot a maze's graph.
| 1 2 3 4 | 
| g | graph with maze structure. | 
| layout | layout (default taken from g$layout). | 
| labels | logical; whether to plot node labels. | 
| edge.color | color used for edges. | 
| vertex.color | color used for node borders. | 
| vertex.fill | color used for nodes. | 
| vertex.size | node size. | 
| vertex.label.color | color used for node labels. | 
| vertex.label.size | size used for node labels. | 
| path.show | logical; whether to show the path between two nodes. | 
| path.start | path starting node. | 
| path.end | path end node. | 
| ... | extra arguments passed down to geom_segment(). | 
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