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plotting - Building a Career Ladder Lattice (Follow up)


I want to thank you both for your help above. I'm going to abandon my quest for a number to label substitution using VertexRenderingFunction; because I need the labels to appear inside the yellow boxes as in:


LayeredGraphPlot[{"Tile & Marble Setter" -> "Construction Foreman", 
"Construction Foreman" -> "Bricklayer",
"Stonemason" -> "Construction Foreman",
"Tile & Marble Setter" -> "Bricklayer",
"Bricklayer" -> "Tile & Marble Setter",
"Tile & Marble Setter" -> "Stonemason",

"Bricklayer" -> "Stonemason", "Stonemason" -> "Bricklayer",
"Apprentice Tile & Marble Setter" -> "Tile & Marble Setter",
"Apprentice Tile & Marble Setter" -> "Apprentice Bricklayer",
"Apprentice Tile & Marble Setter" -> "Apprentice Stonemason",
"Apprentice Bricklayer" -> "Apprentice Tile & Marble Setter",
"Apprentice Bricklayer" -> "Bricklayer",
"Apprentice Bricklayer" -> "Apprentice Stonemason",
"Apprentice Stonemason" -> "Apprentice Bricklayer",
"Apprentice Stonemason" -> "Stonemason",
"Helper/Finisher" -> "Apprentice Tile & Marble Setter",

"Helper/Finisher" -> "Apprentice Bricklayer",
"Helper/Finisher" -> "Apprentice Stonemason"},
VertexLabeling -> True,
VertexCoordinateRules -> {{3, 6}, {6, 9}, {6, 6}, {9, 6}, {3, 3}, {6,
3}, {9, 3}, {6, 0}}]

The question now becomes; how can I get single double-arrows joining:


Tile & Marble Setter <---> Bricklayer;


Bricklayer <---> Stonemason;


Apprentice Tile & Marble Setter <---> Apprentice Bricklayer;



Apprentice Bricklayer <---> Apprentice Stonemason;


in the above LayeredGraphPlot?


Thanks again!



Answer



VertexCoordinateRules apply to elements in the absolute order given, so by leading with 2 in 2 -> 1 you need to give its coordinate first.


titles = {"Construction Foreman",
"Tile & Marble Setter",
"Bricklayer",
"Stonemason",
"Apprentice Tile & Marble Setter",

"Apprentice Bricklayer",
"Apprentice Stonemason",
"Helper/Finisher"};

LayeredGraphPlot[{2 -> 1, 3 -> 1, 4 -> 1, 2 -> 3, 3 -> 2, 2 -> 4, 3 -> 4, 4 -> 3,
5 -> 2, 5 -> 6, 5 -> 7, 6 -> 5, 6 -> 3, 6 -> 7, 7 -> 6, 7 -> 4, 8 -> 5, 8 -> 6,
8 -> 7},
VertexCoordinateRules ->
{{3, 6}, {6, 9}, {6, 6}, {9, 6}, {3, 3}, {6, 3}, {9, 3}, {6, 0}},
VertexRenderingFunction ->

(Text[Style[titles[[#2]], Background -> White] ~Rotate~ (-20 °), #] &)
]

enter image description here


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