[BioC] Hyperdraw: bidirectional edges

[Paul Murrell]

Hi

I have committed two changes to 'hyperdraw':

1. You can now specify "start" and "both" as a value for "arrowLoc" to 
get arrows at start as well as end of hyperedge.

2. The conversion from Hypergraph to graphBPH now properly uses the 
HyperEdge labels.

With those changes, the following should work ...


dh1 <- DirectedHyperedge("A", "B", "R1")
dh2 <- DirectedHyperedge(c("A", "B"), c("C", "D"), "R2")
dh3 <- DirectedHyperedge("D", "E", "R3")
hg <- Hypergraph(LETTERS[1:5], list(dh1, dh2, dh3))
testbph <- graphBPH(hg)
testrabph <- graphLayout(testbph, layoutType="dot")
graphDataDefaults(testrabph, "arrowLoc") <- "both"
plot(testrabph)


A workaround with the currently released version of 'hyperdraw' is this ...


dh1 <- DirectedHyperedge("A", "B", "R1")
dh2 <- DirectedHyperedge(c("A", "B"), c("C", "D"), "R2")
dh3 <- DirectedHyperedge("D", "E", "R3")
hg <- Hypergraph(LETTERS[1:5], list(dh1, dh2, dh3))
testbph <- graphBPH(hg)
testrabph <- graphLayout(testbph, layoutType="dot")
graphDataDefaults(testrabph, "arrowLoc") <- "end"
plot(testrabph)
edges <- grid.get("xspline", grep=TRUE, global=TRUE)
for (i in edges) {
     if (is.null(i$arrow)) {
         grid.edit(i$name,
                   arrow=arrow(angle=30, length=unit(1.5, "mm"),
                       ends="first", type="closed"),
                   redraw=FALSE)
     }
}
edgeNames <- hyperedgeLabels(hg)
edgeLabels <- grid.get("text", grep=TRUE, global=TRUE)
for (i in 1:length(edgeLabels)) {
     grid.edit(edgeLabels[[i]]$name,
               label=edgeNames[i],
               redraw=FALSE)
}
grid.refresh()


Does that do what you want ?

Paul


On 05/14/13 03:27, hettling wrote:
> Hello,
>
> I have another question about the Hyperdraw package. I would like to
> draw bidirectional edges with arrows on both sides of the edge.
>
> I took the example from the vignette, below my failed naive attempt:
>
> ##
> dh1 <- DirectedHyperedge("A", "B", "R1")
> dh1r <- DirectedHyperedge("B", "A", "R1") ##added edge
> dh2 <- DirectedHyperedge(c("A", "B"), c("C", "D"), "R2")
> dh3 <- DirectedHyperedge("D", "E", "R3")
> hg <- Hypergraph(LETTERS[1:5], list(dh1, dh1r, dh2, dh3))
> testbph <- graphBPH(hg)
> testrabph <- graphLayout(testbph, layoutType="dot")
> graphDataDefaults(testrabph, "arrowLoc") <- "end"
> plot(testrabph)
> ##
>
> In order to make the edge from "A" -> "B" bidirectional, I made another
> edge "B" -> "A" with the same label. Now I get two distinct edges.
>
> Is there a way to get two arrows on one and the same edge?
>
> Also, I do not understand why in my example, the edge labels are the
> numbers 1:4, despite the fact that all 'DirectedHyperedge' objects have
> a label.
>
> I hope my question is clear,
> many thanks in advance.
>
> With Kind Regards
>
> Hannes
>
>

-- 
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
paul at stat.auckland.ac.nz
http://www.stat.auckland.ac.nz/~paul/