plot-gGraph | R Documentation |
Various functions to plot a gGraph object: plot
opens a
device and plot the object, while points
plots the object on the
existing device. plotEdges
only plots the edges of the graph: it can
be called directly, or via arguments passed to plot
and
points
.
x |
a gGraph object. |
shape |
a shapefile used as background to the object. Must be of the
class |
psize |
a numeric giving the size of points. |
pch |
a numeric or a character indicating the type of point. |
col |
a character string indicating the color to be used. |
edges |
a logical indicating if edges should be plotted (TRUE) or not (FALSE). |
reset |
a logical indicating if plotting parameters should be reset (TRUE) or not (FALSE). |
bg.col |
a character string indicating the color of the polygons of the shapefile used as background. |
border.col |
a character string indicating the color of the polygon borders. |
lwd |
a numeric indicating the width of line (used for edges). |
useCosts |
a logical indicating if edge width should be inversely proportionnal to edge cost (TRUE) or not (FALSE). |
maxLwd |
a numeric indicating the maximum edge width (corresponding to the maximum weight). |
col.rules |
a data.frame with two named columns, the first one giving
values of a node attribute, and the second one stating colors to be used for
each value. If not provided, this is seeked from the |
sticky.points |
a logical indicating if added points should be kept
when replotting (TRUE), or not (FALSE). In any case, |
lty |
the type of line (for the edges). |
pcol |
a character indicating the color to be used for points. |
sticky.edges |
a logical indicating whether added edges should be kept
when replotting (TRUE), or not (FALSE, default). In any case,
|
... |
further arguments passed to the generic methods (plot, points, and segments, respectively). |
Plotting of a gGraph object stores some parameters in R; see details for more information.
To be able to zoom in and out, or slide the window, previous plotting
information are stored in a particular environment (.geoGraphEnv), which is
created when loading geoGraph
. Users should not have to interact
directly with objects in this environment.
The resulting plotting behaviour is that when plotting a gGraph
object, last plotting parameters are re-used. To override this behaviour,
specify reset=TRUE
as argument to plot
.
Different functions to explore these plots:
geo.zoomin
, geo.zoomout
,
geo.slide
, geo.back
.
isInArea
, to retain a set of visible data.
## just the background
plot(worldgraph.10k, reset = TRUE, type = "n")
## basic plot
plot(worldgraph.10k)
## zooming and adding edges
geo.zoomin(list(x = c(90, 150), y = c(0, -50)))
plot(worldgraph.10k, edges = TRUE)
## display edges differently
plotEdges(worldgraph.10k, col = "red", lwd = 2)
## replot points with different color
points(worldgraph.10k, col = "orange")
## mask points in the sea
inSea <- unlist(getNodesAttr(worldgraph.10k, attr.name = "habitat")) == "sea"
head(inSea)
points(worldgraph.10k[inSea], col = "white", sticky = TRUE) # this will stay
## but better, only draw those on land, and use a fancy setup
par(bg = "blue")
plot(worldgraph.10k[!inSea], bg.col = "darkgreen", col = "purple", edges = TRUE)
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