14
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This is a nice graph:

g = CycleGraph[4];

Graph[g, VertexCoordinates -> {{0, 0}, {0, 1}, {1, 1}, {1, 0}}, 
 VertexLabels -> Placed["Name", Center], VertexSize -> Medium, 
 EdgeShapeFunction -> 
  GraphElementData[{"CurvedArc", "Curvature" -> 0.5}]]

enter image description here

But I want that the edges separated by an offset from the vertices. Is there a simple way to control this within GraphElementData, similarly to how I could control the curvature? I want also an arrow but if I add "CarvedArrow", "ArrowSize" -> .1 to "CurvedArc", "Curvature" -> 0.5 MA does'nt display anything.

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  • $\begingroup$ Where are your g? $\endgroup$ – yode Nov 10 '16 at 7:58
  • $\begingroup$ Please always put the code in a code block. Select the code with the mouse and press the {} button on the toolbar. I'm going to edit the post for you now, but please do this every time in the future when you post. I see several downvotes, no doubt the lack of formatting contributed to that (as well as the lack of a concrete g, which I'm going to also edit into the post now). $\endgroup$ – Szabolcs Nov 10 '16 at 9:15
  • $\begingroup$ Sorry not to have respected the standard I certainly was not correctly awaked. the graph was g = {a0 -> b0, b0 -> c0 , c0 -> d0, d0 -> a0}. Normaly I try to pay attention to this. I often fail. $\endgroup$ – cyrille.piatecki Nov 10 '16 at 9:21
  • $\begingroup$ OK, so the adding CycleGraph was exactly what you meant then. $\endgroup$ – Szabolcs Nov 10 '16 at 9:43
  • $\begingroup$ Yes and the answer was perfect $\endgroup$ – cyrille.piatecki Nov 10 '16 at 10:34
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ClearAll[esF]
esF[setback_: .2, as_: .1] := {Arrowheads[as], 
    Arrow[GraphElementData[{"CurvedArc", "Curvature" -> 0.5}][##], setback]} &;

g0 = Graph[{a0 -> b0, b0 -> c0, c0 -> d0, d0 -> a0}, 
   VertexCoordinates -> {{0, 0}, {0, 1}, {1, 1}, {1, 0}}, 
   VertexLabels -> Placed["Name", Center], VertexSize -> Medium, 
   ImageSize -> 250];

SetProperty[g0, EdgeShapeFunction -> esF[]]

Mathematica graphics

Row[Labeled[SetProperty[g0, EdgeShapeFunction -> esF[#]], 
    "setback: " <> ToString[#], Top] & /@ {.2, {0, .2}, {.2, .4}}]

Mathematica graphics

Row[Labeled[SetProperty[g0, EdgeShapeFunction -> esF[.2, #]], 
    "size: " <> ToString[#], Top] & /@ {.1, .2, Small, Large}]

Mathematica graphics

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