Use this if you are using igraph from R
tkplot and its companion functions serve as an interactive graph
drawing facility. Not all parameters of the plot can be changed
interactively right now though, eg. the colors of vertices, edges, and also
others have to be pre-defined.
tkplot(graph, canvas.width = 450, canvas.height = 450, ...) tk_close(tkp.id, window.close = TRUE) tk_off() tk_fit(tkp.id, width = NULL, height = NULL) tk_center(tkp.id) tk_reshape(tkp.id, newlayout, ..., params) tk_postscript(tkp.id) tk_coords(tkp.id, norm = FALSE) tk_set_coords(tkp.id, coords) tk_rotate(tkp.id, degree = NULL, rad = NULL) tk_canvas(tkp.id)
graph |
The |
canvas.width, canvas.height |
The size of the tkplot drawing area. |
... |
Additional plotting parameters. See igraph.plotting for the complete list. |
tkp.id |
The id of the tkplot window to close/reshape/etc. |
window.close |
Leave this on the default value. |
width |
The width of the rectangle for generating new coordinates. |
height |
The height of the rectangle for generating new coordinates. |
newlayout |
The new layout, see the |
params |
Extra parameters in a list, to pass to the layout function. |
norm |
Logical, should we norm the coordinates. |
coords |
Two-column numeric matrix, the new coordinates of the vertices, in absolute coordinates. |
degree |
The degree to rotate the plot. |
rad |
The degree to rotate the plot, in radian. |
tkplot is an interactive graph drawing facility. It is not very well
developed at this stage, but it should be still useful.
It's handling should be quite straightforward most of the time, here are some remarks and hints.
There are different popup menus, activated by the right mouse button, for vertices and edges. Both operate on the current selection if the vertex/edge under the cursor is part of the selection and operate on the vertex/edge under the cursor if it is not.
One selection can be active at a time, either a vertex or an edge selection.
A vertex/edge can be added to a selection by holding the control key
while clicking on it with the left mouse button. Doing this again deselect
the vertex/edge.
Selections can be made also from the Select menu. The 'Select some
vertices' dialog allows to give an expression for the vertices to be
selected: this can be a list of numeric R expessions separated by commas,
like '1,2:10,12,14,15' for example. Similarly in the 'Select some
edges' dialog two such lists can be given and all edges connecting a vertex
in the first list to one in the second list will be selected.
In the color dialog a color name like 'orange' or RGB notation can also be used.
The tkplot command creates a new Tk window with the graphical
representation of graph. The command returns an integer number, the
tkplot id. The other commands utilize this id to be able to query or
manipulate the plot.
tk_close closes the Tk plot with id tkp.id.
tk_off closes all Tk plots.
tk_fit fits the plot to the given rectangle
(width and height), if some of these are NULL the
actual physical width od height of the plot window is used.
tk_reshape applies a new layout to the plot, its optional
parameters will be collected to a list analogous to layout.par.
tk_postscript creates a dialog window for saving the plot
in postscript format.
tk_canvas returns the Tk canvas object that belongs to a graph
plot. The canvas can be directly manipulated then, eg. labels can be added,
it could be saved to a file programmatically, etc. See an example below.
tk_coords returns the coordinates of the vertices in a matrix.
Each row corresponds to one vertex.
tk_set_coords sets the coordinates of the vertices. A two-column
matrix specifies the new positions, with each row corresponding to a single
vertex.
tk_center shifts the figure to the center of its plot window.
tk_rotate rotates the figure, its parameter can be given either
in degrees or in radians.
tkplot returns an integer, the id of the plot, this can be
used to manipulate it from the command line.
tk_canvas returns tkwin object, the Tk canvas.
tk_coords returns a matrix with the coordinates.
tk_close, tk_off, tk_fit,
tk_reshape, tk_postscript, tk_center
and tk_rotate return NULL invisibly.
g <- make_ring(10)
tkplot(g)
## Saving a tkplot() to a file programmatically
g <- make_star(10, center=10)
E(g)$width <- sample(1:10, ecount(g), replace=TRUE)
lay <- layout_nicely(g)
id <- tkplot(g, layout=lay)
canvas <- tk_canvas(id)
tcltk::tkpostscript(canvas, file="/tmp/output.eps")
tk_close(id)
## Setting the coordinates and adding a title label
g <- make_ring(10)
id <- tkplot(make_ring(10), canvas.width=450, canvas.height=500)
canvas <- tk_canvas(id)
padding <- 20
coords <- norm_coords(layout_in_circle(g), 0+padding, 450-padding,
50+padding, 500-padding)
tk_set_coords(id, coords)
width <- as.numeric(tkcget(canvas, "-width"))
height <- as.numeric(tkcget(canvas, "-height"))
tkcreate(canvas, "text", width/2, 25, text="My title",
justify="center", font=tcltk::tkfont.create(family="helvetica",
size=20,weight="bold"))
Gabor Csardi csardi.gabor@gmail.com