addPolys: Add a PolySet to an Existing Plot as Polygons

In PBSmapping: Mapping Fisheries Data and Spatial Analysis Tools

Add a PolySet to an Existing Plot as Polygons

Description

Add a PolySet to an existing plot, where each unique (PID, SID) describes a polygon.

Usage

addPolys (polys, xlim = NULL, ylim = NULL, polyProps = NULL,
          border = NULL, lty = NULL, col = NULL, colHoles = NULL,
          density = NA, angle = NULL, ...)

Arguments

polys	PolySet to add (required).
xlim	range of X-coordinates.
ylim	range of Y-coordinates.
polyProps	PolyData specifying which polygons to plot and their properties. par parameters passed as direct arguments supersede these data.
border	vector describing edge colours (cycled by PID).
lty	vector describing line types (cycled by PID).
col	vector describing fill colours (cycled by PID).
colHoles	vector describing hole colours (cycled by PID). The default, NULL, should be used in most cases as it renders holes transparent. colHoles is designed solely to eliminate retrace lines when images are converted to PDF format. If colHoles is specified, underlying information (i.e., previously plotted shapes) will be obliterated. If NA is specified, only outer polygons are drawn, consequently filling holes.
density	vector describing shading line densities (lines per inch, cycled by PID).
angle	vector describing shading line angles (degrees, cycled by PID).
...	additional par parameters for the polygon function.

Details

The plotting routine connects the last vertex of each discrete polygon to the first vertex of that polygon. It supports both borders (border, lty) and fills (col, density, angle). It clips polys to xlim and ylim before plotting.

For additional help on the arguments border, lty, col, density, and angle, please see polygon and par.

Value

PolyData consisting of the PolyProps used to create the plot.

Author(s)

Nicholas M. Boers, Staff Software Engineer
Jobber, Edmonton AB
Last modified Rd: 2013-04-10

See Also

addLabels, addStipples, clipPolys, closePolys, fixBound, fixPOS, locatePolys, plotLines, plotMap, plotPoints, plotPolys, thinPolys, thickenPolys.

Examples

local(envir=.PBSmapEnv,expr={
  oldpar = par(no.readonly=TRUE)
  #--- create a PolySet to plot
  polys <- data.frame(PID=rep(1,4),POS=1:4,X=c(0,1,1,0),Y=c(0,0,1,1))
  polys <- as.PolySet(polys, projection=1)
  #--- plot the PolySet
  plotPolys(polys,xlim=c(-.5,1.5),ylim=c(-.5,1.5),density=0,projection=1)
  #--- add the PolySet to the plot (in a different style)
  addPolys(polys,col="green",border="blue",lwd=3)
  par(oldpar)
})

PBSmapping documentation built on Nov. 4, 2023, 9:08 a.m.