network.arrow
draws a segment or arrow between two pairs of points; unlike arrows
or segments
, the new plot element is drawn as a polygon.
network.arrow(x0, y0, x1, y1, length = 0.1, angle = 20, width = 0.01, col = 1, border = 1, lty = 1, offset.head = 0, offset.tail = 0, arrowhead = TRUE, curve = 0, edge.steps = 50, ...)
polygon
network.arrow
provides a useful extension of segments
and arrows
when fine control is needed over the resulting display. (The results also look better.) Note that edge curvature is quadratic, with curve
providing the maximum horizontal deviation of the edge (left-handed). Head/tail offsets are used to adjust the end/start points of an edge, relative to the baseline coordinates; these are useful for functions like plot.network
, which need to draw edges incident to vertices of varying radii.
plot.network
, network.loop
, polygon
#Plot two points
plot(1:2,1:2)
#Add an edge
network.arrow(1,1,2,2,width=0.01,col="red",border="black")
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