114 lines
3.4 KiB
R
114 lines
3.4 KiB
R
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library(grid)
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HersheyLabel <- function(x, y=unit(.5, "npc")) {
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lines <- strsplit(x, "\n")[[1]]
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if (!is.unit(y))
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y <- unit(y, "npc")
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n <- length(lines)
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if (n > 1) {
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y <- y + unit(rev(seq(n)) - mean(seq(n)), "lines")
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}
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grid.text(lines, y=y, gp=gpar(fontfamily="HersheySans"))
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}
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################################################################################
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## Nesting of patterns, clipping paths, masks, groups, and paths
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## ALL disallowed within a path or clipping path
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grid.newpage()
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pat <- pattern(circleGrob(r=unit(.5, "cm"), gp=gpar(fill="black")),
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width=unit(2, "cm"), height=unit(2, "cm"),
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extend="repeat")
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path <- circleGrob(gp=gpar(fill=pat))
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pushViewport(viewport(clip=path))
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grid.rect(gp=gpar(fill="grey"))
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HersheyLabel("clipping path is based on circle
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circle has (tiling) pattern fill
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result is grey circle")
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grid.newpage()
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pat <- linearGradient()
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path <- circleGrob(gp=gpar(fill=pat))
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pushViewport(viewport(clip=path))
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grid.rect(gp=gpar(fill="grey"))
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HersheyLabel("clipping path is based on circle
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circle has gradeint fill
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result is grey circle")
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grid.newpage()
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pat <- pattern(circleGrob(r=unit(.5, "cm"), gp=gpar(fill="black")),
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width=unit(2, "cm"), height=unit(2, "cm"),
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extend="repeat")
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path <- circleGrob(gp=gpar(fill=pat))
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grid.fillStroke(path, gp=gpar(fill="grey"))
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HersheyLabel("path is based on circle
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circle has (tiling) pattern fill
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path is filled grey
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result is filled grey circle
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(pattern fill silently ignored)")
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grid.newpage()
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cpath <- circleGrob(r=.2)
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path <- circleGrob(vp=viewport(clip=cpath))
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grid.fillStroke(path, gp=gpar(fill="grey"))
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HersheyLabel("path is based on circle
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circle has viewport with
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clipping path based on smaller circle
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result is filled grey circle
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(clipping path ignored with warning)")
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grid.newpage()
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mask <- circleGrob(r=.2, gp=gpar(fill="black"))
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path <- circleGrob(vp=viewport(mask=mask))
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grid.fillStroke(path, gp=gpar(fill="grey"))
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HersheyLabel("path is based on circle
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circle has viewport with
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mask based on smaller circle
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result is filled grey circle
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(mask ignored with warning)")
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grid.newpage()
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group <- groupGrob(circleGrob(r=.2))
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path <- gTree(children=gList(circleGrob(), group))
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grid.fillStroke(path, gp=gpar(fill="grey"))
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HersheyLabel("path is based on circle AND group
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(group is smaller circle)
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result is filled grey circle
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(group ignored with warning)")
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grid.newpage()
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grid.define(circleGrob(r=.2), name="g")
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path <- gTree(children=gList(circleGrob(), useGrob("g")))
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grid.fillStroke(path, gp=gpar(fill="grey"))
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HersheyLabel("path is based on circle AND group *use*
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(group is smaller circle)
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result is filled grey circle
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(group ignored with warning)")
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grid.newpage()
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subpath <- strokeGrob(circleGrob(r=.2))
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path <- gTree(children=gList(circleGrob(), subpath))
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grid.fillStroke(path, gp=gpar(fill="grey"))
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HersheyLabel("path is based on circle AND subpath
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(subpath is smaller circle)
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result is filled grey circle
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(subpath ignored with warning)")
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grid.newpage()
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subpath <- strokeGrob(circleGrob(r=.2))
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path <- gTree(children=gList(subpath, circleGrob()))
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grid.fillStroke(path, gp=gpar(fill="grey"))
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HersheyLabel("path is based on subpath AND circle
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(subpath is smaller circle)
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result is filled grey circle
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(subpath ignored with warning)")
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################################################################################
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## TODO
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notrun <- function() {
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} ## notrun()
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