R : Copyright 2005, The R Foundation for Statistical Computing
Version 2.1.1  (2005-06-20), ISBN 3-900051-07-0

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> ### * <HEADER>
> ###
> attach(NULL, name = "CheckExEnv")
> assign(".CheckExEnv", as.environment(2), pos = length(search())) # base
> ## add some hooks to label plot pages for base and grid graphics
> setHook("plot.new", ".newplot.hook")
> setHook("persp", ".newplot.hook")
> setHook("grid.newpage", ".gridplot.hook")
> 
> assign("cleanEx",
+        function(env = .GlobalEnv) {
+ 	   rm(list = ls(envir = env, all.names = TRUE), envir = env)
+            RNGkind("default", "default")
+ 	   set.seed(1)
+    	   options(warn = 1)
+ 	   delayedAssign("T", stop("T used instead of TRUE"),
+ 		  assign.env = .CheckExEnv)
+ 	   delayedAssign("F", stop("F used instead of FALSE"),
+ 		  assign.env = .CheckExEnv)
+ 	   sch <- search()
+ 	   newitems <- sch[! sch %in% .oldSearch]
+ 	   for(item in rev(newitems))
+                eval(substitute(detach(item), list(item=item)))
+ 	   missitems <- .oldSearch[! .oldSearch %in% sch]
+ 	   if(length(missitems))
+ 	       warning("items ", paste(missitems, collapse=", "),
+ 		       " have been removed from the search path")
+        },
+        env = .CheckExEnv)
> assign("..nameEx", "__{must remake R-ex/*.R}__", env = .CheckExEnv) # for now
> assign("ptime", proc.time(), env = .CheckExEnv)
> grDevices::postscript("gpclib-Examples.ps")
> assign("par.postscript", graphics::par(no.readonly = TRUE), env = .CheckExEnv)
> options(contrasts = c(unordered = "contr.treatment", ordered = "contr.poly"))
> options(warn = 1)    
> library('gpclib')
General Polygon Clipper Library for R (version 1.3 )
	Type 'class ? gpc.poly' for help
> 
> assign(".oldSearch", search(), env = .CheckExEnv)
> assign(".oldNS", loadedNamespaces(), env = .CheckExEnv)
> cleanEx(); ..nameEx <- "gpc.poly-class"
> 
> ### * gpc.poly-class
> 
> flush(stderr()); flush(stdout())
> 
> ### Name: gpc.poly-class
> ### Title: Class "gpc.poly"
> ### Aliases: gpc.poly-class [,gpc.poly-method
> ###   append.poly,gpc.poly,gpc.poly-method area.poly,gpc.poly-method
> ###   coerce,matrix,gpc.poly-method coerce,data.frame,gpc.poly-method
> ###   coerce,gpc.poly,matrix-method coerce,gpc.poly,numeric-method
> ###   coerce,numeric,gpc.poly-method get.bbox,gpc.poly-method
> ###   get.pts,gpc.poly-method intersect,gpc.poly,gpc.poly-method
> ###   plot,gpc.poly-method scale.poly,gpc.poly-method
> ###   setdiff,gpc.poly,gpc.poly-method show,gpc.poly-method
> ###   union,gpc.poly,gpc.poly-method
> ### Keywords: classes
> 
> ### ** Examples
> 
> ## Make some random polygons
> set.seed(100)
> a <- cbind(rnorm(100), rnorm(100))
> a <- a[chull(a), ]
> 
> ## Convert `a' from matrix to "gpc.poly"
> a <- as(a, "gpc.poly")
> 
> b <- cbind(rnorm(100), rnorm(100))
> b <- as(b[chull(b), ], "gpc.poly")
> 
> ## More complex polygons with an intersection
> p1 <- read.polyfile(system.file("poly-ex/ex-poly1.txt", package = "gpclib"))
> p2 <- read.polyfile(system.file("poly-ex/ex-poly2.txt", package = "gpclib"))
> 
> ## Plot both polygons and highlight their intersection in red
> plot(append.poly(p1, p2))
> plot(intersect(p1, p2), poly.args = list(col = 2), add = TRUE)
> 
> ## Highlight the difference p1 \ p2 in green
> plot(setdiff(p1, p2), poly.args = list(col = 3), add = TRUE)
> 
> ## Highlight the difference p2 \ p1 in blue
> plot(setdiff(p2, p1), poly.args = list(col = 4), add = TRUE)
> 
> ## Plot the union of the two polygons
> plot(union(p1, p2))
> 
> ## Take the non-intersect portions and create a new polygon
> ## combining the two contours
> p.comb <- append.poly(setdiff(p1, p2), setdiff(p2, p1))
> plot(p.comb, poly.args = list(col = 2, border = 0))
> 
> 
> ## Coerce from a matrix
> x <- 
+ structure(c(0.0934073560027759, 0.192713393476752, 0.410062456627342, 
+ 0.470020818875781, 0.41380985426787, 0.271408743927828, 0.100902151283831, 
+ 0.0465648854961832, 0.63981588032221, 0.772382048331416,
+ 0.753739930955121, 0.637744533947066, 0.455466052934407,
+ 0.335327963176065, 0.399539700805524, 
+ 0.600460299194476), .Dim = c(8, 2))
> y <- 
+ structure(c(0.404441360166551, 0.338861901457321, 0.301387925052047, 
+ 0.404441360166551, 0.531852879944483, 0.60117973629424, 0.625537820957668, 
+ 0.179976985040276, 0.341542002301496, 0.445109321058688,
+ 0.610817031070196, 0.596317606444189, 0.459608745684695,
+ 0.215189873417722), .Dim = c(7, 2))
> 
> x1 <- as(x, "gpc.poly")
> y1 <- as(y, "gpc.poly")
> 
> plot(append.poly(x1, y1))
> plot(intersect(x1, y1), poly.args = list(col = 2), add = TRUE)
> 
> 
> 
> cleanEx(); ..nameEx <- "gpc.poly.nohole-class"
> 
> ### * gpc.poly.nohole-class
> 
> flush(stderr()); flush(stdout())
> 
> ### Name: gpc.poly.nohole-class
> ### Title: Class "gpc.poly.nohole"
> ### Aliases: gpc.poly.nohole-class coerce,numeric,gpc.poly.nohole-method
> ### Keywords: classes
> 
> ### ** Examples
> 
> ## None
> 
> 
> 
> cleanEx(); ..nameEx <- "new-generics"
> 
> ### * new-generics
> 
> flush(stderr()); flush(stdout())
> 
> ### Name: new-generics
> ### Title: Generics/Methods for polygon objects
> ### Aliases: new-generics append.poly append.poly-methods get.bbox
> ###   get.bbox-methods area.poly area.poly-methods get.pts get.pts-methods
> ###   scale.poly scale.poly-methods
> ### Keywords: methods
> 
> ### ** Examples
> 
> holepoly <- read.polyfile(system.file("poly-ex/hole-poly.txt", package =
+ "gpclib"), nohole = FALSE)
> area.poly(holepoly)
[1] 8
> stopifnot(area.poly(holepoly) == 8)
> 
> 
> 
> cleanEx(); ..nameEx <- "polyfile"
> 
> ### * polyfile
> 
> flush(stderr()); flush(stdout())
> 
> ### Name: polyfile
> ### Title: Read/Write polygon data
> ### Aliases: polyfile read.polyfile write.polyfile
> ### Keywords: IO
> 
> ### ** Examples
> 
> ## None right now.
> 
> 
> 
> ### * <FOOTER>
> ###
> cat("Time elapsed: ", proc.time() - get("ptime", env = .CheckExEnv),"\n")
Time elapsed:  0.82 0.01 0.84 0 0 
> grDevices::dev.off()
null device 
          1 
> ###
> ### Local variables: ***
> ### mode: outline-minor ***
> ### outline-regexp: "\\(> \\)?### [*]+" ***
> ### End: ***
> quit('no')