R Under development (unstable) (2025-07-22 r88445 ucrt) -- "Unsuffered Consequences"
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> 
> library(grid)
> require(gridSVG)
Loading required package: gridSVG

Attaching package: 'gridSVG'

The following objects are masked from 'package:grid':

    linearGradient, pattern, radialGradient

The following object is masked from 'package:grDevices':

    dev.off

> 
> example(grid.path)

grd.pt> pathSample <- function(x, y, rule, gp = gpar()) {
grd.pt+     if (is.na(rule))
grd.pt+         grid.path(x, y, id = rep(1:2, each = 4), gp = gp)
grd.pt+     else
grd.pt+         grid.path(x, y, id = rep(1:2, each = 4), rule = rule, gp = gp)
grd.pt+     if (!is.na(rule))
grd.pt+         grid.text(paste("Rule:", rule), y = 0, just = "bottom")
grd.pt+ }

grd.pt> pathTriplet <- function(x, y, title) {
grd.pt+     pushViewport(viewport(height = 0.9, layout = grid.layout(1, 3),
grd.pt+                           gp = gpar(cex = .7)))
grd.pt+     grid.rect(y = 1, height = unit(1, "char"), just = "top",
grd.pt+               gp = gpar(col = NA, fill = "grey"))
grd.pt+     grid.text(title, y = 1, just = "top")
grd.pt+     pushViewport(viewport(layout.pos.col = 1))
grd.pt+     pathSample(x, y, rule = "winding",
grd.pt+                gp = gpar(fill = "grey"))
grd.pt+     popViewport()
grd.pt+     pushViewport(viewport(layout.pos.col = 2))
grd.pt+     pathSample(x, y, rule = "evenodd",
grd.pt+                gp = gpar(fill = "grey"))
grd.pt+     popViewport()
grd.pt+     pushViewport(viewport(layout.pos.col = 3))
grd.pt+     pathSample(x, y, rule = NA)
grd.pt+     popViewport()
grd.pt+     popViewport()
grd.pt+ }

grd.pt> pathTest <- function() {
grd.pt+     grid.newpage()
grd.pt+     pushViewport(viewport(layout = grid.layout(5, 1)))
grd.pt+     pushViewport(viewport(layout.pos.row = 1))
grd.pt+     pathTriplet(c(.1, .1, .9, .9, .2, .2, .8, .8),
grd.pt+                 c(.1, .9, .9, .1, .2, .8, .8, .2),
grd.pt+                 "Nested rectangles, both clockwise")
grd.pt+     popViewport()
grd.pt+     pushViewport(viewport(layout.pos.row = 2))
grd.pt+     pathTriplet(c(.1, .1, .9, .9, .2, .8, .8, .2),
grd.pt+                 c(.1, .9, .9, .1, .2, .2, .8, .8),
grd.pt+                 "Nested rectangles, outer clockwise, inner anti-clockwise")
grd.pt+     popViewport()
grd.pt+     pushViewport(viewport(layout.pos.row = 3))
grd.pt+     pathTriplet(c(.1, .1, .4, .4, .6, .9, .9, .6),
grd.pt+                 c(.1, .4, .4, .1, .6, .6, .9, .9),
grd.pt+                 "Disjoint rectangles")
grd.pt+     popViewport()
grd.pt+     pushViewport(viewport(layout.pos.row = 4))
grd.pt+     pathTriplet(c(.1, .1, .6, .6, .4, .4, .9, .9),
grd.pt+                 c(.1, .6, .6, .1, .4, .9, .9, .4),
grd.pt+                 "Overlapping rectangles, both clockwise")
grd.pt+     popViewport()
grd.pt+     pushViewport(viewport(layout.pos.row = 5))
grd.pt+     pathTriplet(c(.1, .1, .6, .6, .4, .9, .9, .4),
grd.pt+                 c(.1, .6, .6, .1, .4, .4, .9, .9),
grd.pt+                 "Overlapping rectangles, one clockwise, other anti-clockwise")
grd.pt+     popViewport()
grd.pt+     popViewport()
grd.pt+ }

grd.pt> pathTest()

grd.pt> # Drawing multiple paths at once
grd.pt> holed_rect <- cbind(c(.15, .15, -.15, -.15, .1, .1, -.1, -.1), 
grd.pt+                     c(.15, -.15, -.15, .15, .1, -.1, -.1, .1))

grd.pt> holed_rects <- rbind(
grd.pt+     holed_rect + matrix(c(.7, .2), nrow = 8, ncol = 2, byrow = TRUE),
grd.pt+     holed_rect + matrix(c(.7, .8), nrow = 8, ncol = 2, byrow = TRUE),
grd.pt+     holed_rect + matrix(c(.2, .5), nrow = 8, ncol = 2, byrow = TRUE)
grd.pt+ )

grd.pt> grid.newpage()

grd.pt> grid.path(x = holed_rects[, 1], y = holed_rects[, 2], 
grd.pt+           id = rep(1:6, each = 4), pathId = rep(1:3, each = 8),
grd.pt+           gp = gpar(fill = c('red', 'blue', 'green')),
grd.pt+           rule = 'evenodd')

grd.pt> # Not specifying pathId will treat all points as part of the same path, thus 
grd.pt> # having same fill
grd.pt> grid.newpage()

grd.pt> grid.path(x = holed_rects[, 1], y = holed_rects[, 2], 
grd.pt+           id = rep(1:6, each = 4),
grd.pt+           gp = gpar(fill = c('red', 'blue', 'green')),
grd.pt+           rule = 'evenodd')
> 
> grid.export("path.svg")
> 
> proc.time()
   user  system elapsed 
   0.67    0.07    0.73