convLP: Convert Polylines into a Polygon
In PBSmapping: Mapping Fisheries Data and Spatial Analysis Tools

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

Convert two polylines into a polygon.

1	convLP (polyA, polyB, reverse = TRUE)

`polyA`	PolySet containing a polyline.
`polyB`	PolySet containing a polyline.
`reverse`	Boolean value; if `TRUE`, reverse `polyB`'s vertices.

The resulting PolySet contains all the vertices from polyA in their original order. If reverse = TRUE, this function appends the vertices from polyB in the reverse order (nrow(polyB):1). Otherwise, it appends them in their original order. The PID column equals the PID of polyA. No SID column appears in the result. The resulting polygon is an exterior boundary.

PolySet with a single PID that is the same as polyA. The result contains all the vertices in polyA and polyB. It has the same projection and zone attributes as those in the input PolySets. If an input PolySet's attributes equal NULL, the function uses the other PolySet's. If the PolySet attributes conflict, the result's attribute equals NULL.

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

addLines, appendPolys, closePolys, convCP, joinPolys, plotLines.

local(envir=.PBSmapEnv,expr={
  oldpar = par(no.readonly=TRUE)
  #--- create two polylines
  polyline1 <- data.frame(PID=rep(1,2),POS=1:2,X=c(1,4),Y=c(1,4))
  polyline2 <- data.frame(PID=rep(1,2),POS=1:2,X=c(2,5),Y=c(1,4))
  #--- create two plots to demonstrate the effect of `reverse'
  par(mfrow=c(2, 1))
  plotPolys(convLP(polyline1, polyline2, reverse=TRUE), col=2)
  plotPolys(convLP(polyline1, polyline2, reverse=FALSE), col=3)
  par(oldpar)
})

sh: 1: cannot create /dev/null: Permission denied

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