Examples for 'isoband::isolines_grob'

### ** Examples

library(grid)

viridis_pal <- colorRampPalette(
  c("#440154", "#414487", "#2A788E", "#22A884", "#7AD151", "#FDE725"),
  space = "Lab"
)

x <- (1:ncol(volcano))/(ncol(volcano)+1)
y <- (nrow(volcano):1)/(nrow(volcano)+1)
lines <- isolines(x, y, volcano, 5*(19:38))
bands <- isobands(x, y, volcano, 5*(18:38), 5*(19:39))

b <- isobands_grob(
  bands,
  gp = gpar(col = NA, fill = viridis_pal(21), alpha = 0.4)
)
l <- isolines_grob(
  lines, breaks = 20*(5:10),
  gp = gpar(
    lwd = c(.3, 1, .3, .3)
  )
)

grid.newpage()
grid.draw(b)
grid.draw(l)