addPolys: Add a PolySet to an Existing Plot as Polygons

Description Usage Arguments Details Value Author(s) See Also Examples

View source: R/PBSmapping.r

Description

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

Usage

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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, Associate Professor – Computer Science
MacEwan University, Edmonton AB
Last modified Rd: 2013-04-10

See Also

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

Examples

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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 Jan. 15, 2021, 3:41 p.m.