Add Loops to a Plot
network.loop draws a "loop" at a specified location; this is used to
designate self-ties in plot.network.
network.loop(x0, y0, length = 0.1, angle = 10, width = 0.01, col = 1, border = 1, lty = 1, offset = 0, edge.steps = 10, radius = 1, arrowhead = TRUE, xctr = 0, yctr = 0, ...)
x0 |
a vector of x coordinates for points of origin. |
y0 |
a vector of y coordinates for points of origin. |
length |
arrowhead length, in current plotting units. |
angle |
arrowhead angle (in degrees). |
width |
width for loop body, in current plotting units (can be a vector). |
col |
loop body color (can be a vector). |
border |
loop border color (can be a vector). |
lty |
loop border line type (can be a vector). |
offset |
offset for origin point (can be a vector). |
edge.steps |
number of steps to use in approximating curves. |
radius |
loop radius (can be a vector). |
arrowhead |
boolean; should arrowheads be used? (Can be a vector.) |
xctr |
x coordinate for the central location away from which loops should be oriented. |
yctr |
y coordinate for the central location away from which loops should be oriented. |
... |
additional arguments to |
network.loop is the companion to network.arrow; like
the latter, plot elements produced by network.loop are drawn using
polygon, and as such are scaled based on the current plotting
device. By default, loops are drawn so as to encompass a circular region of
radius radius, whose center is offset units from x0,y0
and at maximum distance from xctr,yctr. This is useful for functions
like plot.network, which need to draw loops incident to
vertices of varying radii.
None.
network.loop is a direct adaptation of
gplot.loop, from the sna package.
Carter T. Butts buttsc@uci.edu
#Plot a few polygons with loops
plot(0,0,type="n",xlim=c(-2,2),ylim=c(-2,2),asp=1)
network.loop(c(0,0),c(1,-1),col=c(3,2),width=0.05,length=0.4,
offset=sqrt(2)/4,angle=20,radius=0.5,edge.steps=50,arrowhead=TRUE)
polygon(c(0.25,-0.25,-0.25,0.25,NA,0.25,-0.25,-0.25,0.25),
c(1.25,1.25,0.75,0.75,NA,-1.25,-1.25,-0.75,-0.75),col=c(2,3))Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.